CA1306657C - Encapsulated bleaches - Google Patents
Encapsulated bleachesInfo
- Publication number
- CA1306657C CA1306657C CA000571624A CA571624A CA1306657C CA 1306657 C CA1306657 C CA 1306657C CA 000571624 A CA000571624 A CA 000571624A CA 571624 A CA571624 A CA 571624A CA 1306657 C CA1306657 C CA 1306657C
- Authority
- CA
- Canada
- Prior art keywords
- encapsulated
- particle
- core
- coating
- hydroxy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011248 coating agent Substances 0.000 claims abstract description 59
- 238000000576 coating method Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007844 bleaching agent Substances 0.000 claims abstract description 42
- 150000001875 compounds Chemical class 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 22
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 19
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 19
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 10
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 10
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims abstract description 8
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 53
- 239000000460 chlorine Substances 0.000 claims description 19
- 229920013820 alkyl cellulose Polymers 0.000 claims description 16
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 13
- 239000003599 detergent Substances 0.000 claims description 11
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 7
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 4
- CEJLBZWIKQJOAT-UHFFFAOYSA-N dichloroisocyanuric acid Chemical compound ClN1C(=O)NC(=O)N(Cl)C1=O CEJLBZWIKQJOAT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 150000004677 hydrates Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims 6
- 239000008186 active pharmaceutical agent Substances 0.000 claims 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 3
- 150000001340 alkali metals Chemical group 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 235000019832 sodium triphosphate Nutrition 0.000 abstract description 21
- -1 sodium sulfate Chemical class 0.000 abstract description 13
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 17
- 239000011162 core material Substances 0.000 description 16
- 229920002678 cellulose Polymers 0.000 description 13
- 235000010980 cellulose Nutrition 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000001913 cellulose Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 150000004687 hexahydrates Chemical class 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000003860 storage Methods 0.000 description 7
- 239000004115 Sodium Silicate Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- VGYFVNQYBUPXCQ-UHFFFAOYSA-N ethene;2-methyloxirane Chemical compound C=C.CC1CO1 VGYFVNQYBUPXCQ-UHFFFAOYSA-N 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 235000019795 sodium metasilicate Nutrition 0.000 description 6
- 229910052911 sodium silicate Inorganic materials 0.000 description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 5
- 125000000217 alkyl group Chemical group 0.000 description 5
- 229920001400 block copolymer Polymers 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000000889 atomisation Methods 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 4
- 229940071676 hydroxypropylcellulose Drugs 0.000 description 4
- TWNIBLMWSKIRAT-VFUOTHLCSA-N levoglucosan Chemical group O[C@@H]1[C@@H](O)[C@H](O)[C@H]2CO[C@@H]1O2 TWNIBLMWSKIRAT-VFUOTHLCSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 125000005189 alkyl hydroxy group Chemical group 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 150000003014 phosphoric acid esters Chemical class 0.000 description 3
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical class ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- HSHXDCVZWHOWCS-UHFFFAOYSA-N N'-hexadecylthiophene-2-carbohydrazide Chemical compound CCCCCCCCCCCCCCCCNNC(=O)c1cccs1 HSHXDCVZWHOWCS-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- JRNVZBWKYDBUCA-UHFFFAOYSA-N N-chlorosuccinimide Chemical compound ClN1C(=O)CCC1=O JRNVZBWKYDBUCA-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000009849 deactivation Effects 0.000 description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- YRIZYWQGELRKNT-UHFFFAOYSA-N 1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione Chemical compound ClN1C(=O)N(Cl)C(=O)N(Cl)C1=O YRIZYWQGELRKNT-UHFFFAOYSA-N 0.000 description 1
- KEQGZUUPPQEDPF-UHFFFAOYSA-N 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Cl)C(=O)N(Cl)C1=O KEQGZUUPPQEDPF-UHFFFAOYSA-N 0.000 description 1
- KEPNSIARSTUPGS-UHFFFAOYSA-N 2-n,4-n,6-n-trichloro-1,3,5-triazine-2,4,6-triamine Chemical compound ClNC1=NC(NCl)=NC(NCl)=N1 KEPNSIARSTUPGS-UHFFFAOYSA-N 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000518994 Conta Species 0.000 description 1
- 229920008712 Copo Polymers 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical class OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- 229920003091 Methocel™ Polymers 0.000 description 1
- 241000282337 Nasua nasua Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 125000005157 alkyl carboxy group Chemical group 0.000 description 1
- 229940045714 alkyl sulfonate alkylating agent Drugs 0.000 description 1
- 150000008052 alkyl sulfonates Chemical class 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- SURLGNKAQXKNSP-DBLYXWCISA-N chlorin Chemical compound C\1=C/2\N/C(=C\C3=N/C(=C\C=4NC(/C=C\5/C=CC/1=N/5)=CC=4)/C=C3)/CC\2 SURLGNKAQXKNSP-DBLYXWCISA-N 0.000 description 1
- IDKXMGZRWKCTGA-UHFFFAOYSA-N chloroimino(oxo)methane Chemical class ClN=C=O IDKXMGZRWKCTGA-UHFFFAOYSA-N 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical class OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- JSYGRUBHOCKMGQ-UHFFFAOYSA-N dichloramine Chemical compound ClNCl JSYGRUBHOCKMGQ-UHFFFAOYSA-N 0.000 description 1
- 125000003963 dichloro group Chemical group Cl* 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 1
- 235000011180 diphosphates Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical class Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- LWXVCCOAQYNXNX-UHFFFAOYSA-N lithium hypochlorite Chemical compound [Li+].Cl[O-] LWXVCCOAQYNXNX-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- IFIDXBCRSWOUSB-UHFFFAOYSA-N potassium;1,3-dichloro-1,3,5-triazinane-2,4,6-trione Chemical compound [K+].ClN1C(=O)NC(=O)N(Cl)C1=O IFIDXBCRSWOUSB-UHFFFAOYSA-N 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 229960001922 sodium perborate Drugs 0.000 description 1
- YKLJGMBLPUQQOI-UHFFFAOYSA-M sodium;oxidooxy(oxo)borane Chemical compound [Na+].[O-]OB=O YKLJGMBLPUQQOI-UHFFFAOYSA-M 0.000 description 1
- 239000013042 solid detergent Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical class [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0039—Coated compositions or coated components in the compositions, (micro)capsules
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/395—Bleaching agents
- C11D3/3953—Inorganic bleaching agents
Abstract
Abstract Stable encapsulated bleach comprising a core of bleaching agent such as an alkaline metal salt of chloroisocyanurate, an inner coating of a chemically compatable separating compound such as sodium sulfate, sodium tripolyphosphate and mixtures thereof, and an outer coating of a water soluble cellulose ether such as hydroxyethyl and hydroxypropyl celluloses.
Description
L3~ 7 M&G-163.604-US-01 Patent ENCAPSULATED BLEACHES
Field of the Invention This invention relates to encapsulated bleaching agents having improved bleach stability in alkaline environments.
Backqround of the Invention Bleaches are a well known group of chemical agents having the unique ability to remove color from a substrate without damaging the substrate. Because of this unique ability bleaches are often incorporated into cleaning compositions as a stain remover. However, most bleaching agents are unstable in typical cleaning compositions due to the alkaline conditions and/or the presence of free moisture.
Various attempts have been made to create a source of bleach which would be stable in~ cleaning compositions including numerous attempts to encapsulate the bleach in various coating compounds. Unfortunately, the encapsulated ! ~ 20 bleaches developed so far are either (i) substantially unstable in highly alkaline environments ~uch as found in solid cast detergents, (ii) difficult to manufacture, and/or (iii) prohibitavely expensive to manufacture.
Accordingly, a substantial need exists for an inexpensive, easily manufactured source of bleach that is stable in a highly alkaline environment.
Summary of the Invention I have discovered~ a source of bleach which can remain stable ~or extended periods of;~time in a highly alkaline 30~environment. The source~of bl~each comprises~ a bleach core encapsulated by an inner coating of a~ chemically compatible, separat~ing compound~and an~outer~ coati~ng ~of a water~soluble ce~l~lulose ether~selected-from th~e group consisting of (Cl_4) alkyl~ celluloses~,~ carboxy ~(Cl 4) alkyl celluloses, hydroxy (C1_4j~alkyl ~oelluloses, carboxy (Cl_4) alkyl hydroxy (Cl_4) alkyl~celluloses,~ (Cl_4)~ alkyl hydroxy (Cl 4) alkyl . , 13~6~7 celluloses and mixtures thereof.
I have discovered that while a bleach core can be effectively protected against an alkaline environment by a single coating of one of the listed water soluble cellulose ethers, the cellulose ether can itself, under the proper conditions, react with and deactivate the bleach core.
Accordingly, I have found it preferable to employ an inner coating of a chemically compatable compound to separate the bleach core from the cellulose ether outer coating.
As utilized herein, including the claims, "inner coating" refers to that coating layer in physical contact with the core material.
Detailed Description of the Invention Including a_Best Mode My stable bleaching composition comprises a bleach core encapsulated in an inner coating of a bleach compatable separating compound and an outer coating of a water soluble cellulose ether.
BLEACHING AGENT
Bleaches suitable for use as the core component include any of the well known bleaching agents capabIe of removing stains from such substrates as dishes, flatware, pots and pans, textiles, countertops, appliances, flooring, etc.
without significantly damaging the substrate. A nonlimiting list of such bleaches includes active halogen releasing bleaches such as hypochlorites, chlorites, chlorinated phosphates, chloroisocyanates, chloroamines etc.; and peroxide compounds such~as ~hydrogen peroxide, perborates, ; ~ percarbonates etc. Preferred bleaches include those bleachec which~ liberate an active halogen species such as Cl , Br , OCl , or OBr under conditions~ normally encountered in ~ typical cleaning processes~ Most preferably, the bleaching ; agent reIeases Cl or OCl . A nonlimiting list of useful ; chlorine releasing bleqches ~incIudes calcium hypochlorite, lithium hypochlorite, chlorinated trisodium phosphate, sodium dichloroisocyanurate, potassium dichloroisocyanurate, ~: .
, ,~ . : .
~3~ 7 , .`
[(monotrichloro)-tetra(monopotassium dichloro)]
pentaisocyanurate, monochloroamine, dichloroamine, trichloromelamine, sulfondichloro-amide, 1,3-dichloro-5,5-dimethyl hydantoin, n-chloroammeline, n chlorosuccinimide, n,n'-dichloroazodicarbonimide, n,n-chloroacetyl urea, n,n'-dichlorobiuret, chlorinated dicyanamide, trichlorocyanuric acid, and hydrates thereof.
Because of their low cost and high bleaching efficiency the most preferred bleaching agents are the alkali metal salts of chloroisocyanurates and the hydrates thereof.
SEPARATING COMPOUND;~
Compounds suitable for use as the inner coating component include any compound which is solid at those temperatures likely to be encountered during storage of the encapsulated bleach (i~e. -5 to 50C), is chemically compatible with (i.e. does not react with) either the bleaching agent core or the water soluble cellulose ether outer coating, and is capable of separating the bleaching -I agent from the cellulose ether so as to prevent deactivation of the bleach by the cellulose ether. Useful separating compounds include specifically but not exclusively water insoluble compounds such as C 11 - 30 fatty acids, waxes and water soluble compounds such as alkyl sulfonates, detergent builders and detergent fillers. Because of their ability to readily release the bleach core under conditions typically encountered during detergent use, the water soluble compounds are preferered. Most preferably, the separating compound is an inorganic~ detergent builder or filler useful in the cleaning compoæition into which the bleach is to be employed.
30~ A nonlimiting list of such ~detergent builders and fillers includes inorganlc compounds~such as sodium sulfate, sodium ; ~ ; ; chloride, tetrasodium pyrophosphate, alkali metal silicates, tetrapotassium ~pyrophosphate, pentasodium tripolyphosphate, pentapo~tassium tripolyphosphate, sodium~ sequicarbonate, 35 ~potassium sequicar~bonate, phytates, etc. Because of their ~ low ~cost, ease~of~ availability,~ ease of use and efficient :'. ~ ' ~ .
~3~6~57 detergent building properties the inner coating compound preferably comprises a mixture of sodium sulfate and a tripolyphosphate.
WATER SOLUBLE CELLULOSE ETHERS
Cellulose is a liner polymer of anhydroglucose units held together by glucosidic linkages. Each anhydroglucose unit contains three hydroxyl groups - one primary and two secondary. Cellulose derivatives such as cellulose ethers are formed by reaction of the cellulose with a chemical reagent at these hydroxyl groups. For example, hydroxyethylcellulose can be prepared by the reaction of alkali cellulose with ethylene oxide in the presence of isopropanol, tert~butanol or acetone in accordance with the following equation:
R 11 loseOH + CH2 - C~2 _ - RcelluloseC 2 2 o Cellulose derivatives useful as the outer coating component in the present invention are the water soluble cellulose ethers selected from the group consisting of (Cl 4) alkyl cellulose, carboxy (Cl~4) alkyl cellulose, hydroxy (Cl 4) alkyl cellulose di(Cl 4) alkyl carboxy (Cl 4) hydroxy (Cl_4) cellulose,~(Cl_4) alkyl hydroxy (Cl_4) alkyl cellulose and mixtures thereof. For reasons of superior bleach stabilizing performance and ease of application, the preferred~ cellulose ethers are the hydroxy (Cl 4) alkyl celluloses with the most preferred cellulose ethers being hydroxyethylcellulose and hydroxy-propylcellulose.
In most commercially available cellulose derivatives, some of the hydroxyl~groups a~re not substituted. The number of~unsubstituted hydroxyl groups is known as the degree of substitution (DS) and is designated by a number from 0 to 3 which represents the average number of~ hydroxyl groups, of the~ three available in the anhydroglucose unit, that have been substituted.~ `
, ~ , :
~ :~3~665~ -A special problem arises in the expression of degree of substitution for hydroxyalkyl derivatives because each time a hydroxyalkyl substituent is added, a new reactive hydroxyl group is formed and the number of reactive hydroxyl sites does not change. The result is the formation of side chains, as shown below:
R 11 loseH + CH2 CH2 ~ RCellulose 2 2 R 11 1 seCH2CH2H ~ CH2 C~2 ~ RcellUlosecH2c 2 2 2 O
To describe the extent of the formation of side chains the term MS has been coined. MS is defined as the number of moles of reagent (i.e. ethylene oxide) combined per anhydroglucose unit.
The ratio of DS to MS is an indication of the average length of the side chains developed. The DS, MS and ratio of DS to MS can affect the chemical properties of the cellulose derivative and only those cellulose ethers that have a DS, MS
and DS:MS which result in a water soluble compound may be usefully employed in the present invention.
The DS o~ several useful cellulose ethers are set forth below:
Table_l . ~
; ~ ~ Cellulose Typical DS : Preferred DS
: :~ydroxymethyl ; 0-2.6 ~ : : 1.3-2.6 Hydroxyethyl ~ 0-3 1.2-3 Hydroxypropyl ~ 1.4 3 ~ 1.4-3 Carboxymethyl 0.4-1.4 : ~ 0.7-0.9 The composition~:can comprise about 20 to 90 wt-%, ; : 35 preferably about 40 ~to 70 wt-% bleach core, about 5 to 60 wt-%, preferably :about lO to 50 wt-~ separating compound ~,,,~, ~3~6~7 inner coating and about l to 25 wt-%, preferably about 2 to l0 wt-% water soluble cellulose ether outer coating.
While not intending to be limited thereby I believe that the water soluble cellulose ethers described herein are capable of protecting a bleaching agent core from deactivation in an alkaline environment because the cellulose ethers are water insoluble when in the presence of at least about l0-50 wt-% inorganic salts such as sodium chloride, sodium sulphate, sodium perborate, etc. (i.e. those conditions typically encountered in solid detergents) and ~; water soluble only when the wt-% of inorganic salt falls outside these levels (i.e. those conditions typically encountered during use of the detergent).
ENCAPSULATION_PROCEDURE
15The bleach may be encapsulated in any convenient manner capable of ensuring complete coating of the bleach.
Obtaining a complete protective coating with the cellulose ether is simplified by the tendency of cellulose ethers to naturally form ~a nonporous, evenly distributed coating on a particle. For reasons of low manufacturing cost and ease of manufacture the bleach is preferably encapsulat~d in a fluidized bed as set forth in detail in the Examples.
Briefly, the separating composition is dissolved in an appropriate solvent, such as water when water soluble, to form an inner coating solution; the water soluble cellulose eth~er dissolved in water to form an outer coating solution;
the bIeach particles fluidized in a fluidized bed apparatus, ` the~ inner~ coating solution ~sprayed onto~ the fluidized particles and~dried, and~the~outer coating solution sprayed 30 ~on~the flu~idized~particles~and d~r1ed.
Exampl`e I
Into a ~ 32~ ter conta~1ner~ was placed ;5.96 Kg granular sodium sulfate, ~1.62 Kg sodium tr~i~olyphosphate and 23.78 Kg water~to form a first coating~solution~.
35~Into~ a fl~u~idized bed ~was~ placed 14.59 Kg CDB-56, a gr~anular dichloroisocyanurate~ dihydrate purchased from FMC
.~ ~
- .
: , .~ .
~3~
, . , and now available from Olin Corporation. The CD3-56 was fluidized with air and the bed heated to 68-79 C. The entire amount of first coating solution was sprayed onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941, at an atomization air pressure of 40 psig, to form once coated CDB-56 particles.
Into the now empty 32 liter container was placed 1.14 Kg KLUCEL J,* a hydroxypropylcellulose purchased from Hercules, Inc., and 34.47 Kg water to form a second coating solution.
The bed temperature was adjusted to 71-72 C. and the entire amount of second coating solution sprayed onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C.
and the protectively encapsulated CDB-56 particles dried.
The process yielded 23.15 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-% core of CDB-56, 35 wt-%
first coat of a mixture of 75 wt-~ sodium sulfate and 25 wt-%
sodium tripolyphosphate hexahydrate and 5 wt-~ second coat of KLUCEL J.
ExamDle II
Into a 32 liter container was placed 5.96 Kg granular sodium sulfate, 1.62 Kg sodium tripolyphosphate and 23.78 Kg water to form a first coating solution.
Into a fluidized bed was placed 13.43 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air and the bed heated to 72-74 C. The entire amount of first coating solution was sprayed onto the 30 CDB-56 granules through a Gustav Schlick Nozzle Model, 941 at an atomized air pressure of 40 psig, to ~orm once CDB-56 coated particles.
Into the now empty 32 liter container was placed 2.27 Kg KLUCEL J~, a hydroxypropylcellulose purchased from ~ercules, Inc., and 70.94 Kg water to form a second coating solution.
The bed temperature was adjusted to 69-71 C. and the entire *Trade-mark ;
A
.
-- :13~6~
amount of second coating solution sprayed onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74O r.
and the protectively encapsulated CDB-56 particles dried.
The process yielded 20.14 Kg of protectively encapsulated CDB-56 particles comprising 55 wt-% core of CDB-56, 35 wt-%
first coat of a mixture of 75 wt-% sodium sulfate and Z5 wt-%
sodium tripolyphosphate hexahydrate and 10 wt-% second coat of KLUCEL J.
Example III
Into a 32 liter container was placed 7. 26 Kg sodium sulfate, 2.42 Kg sodium tripolyphosphate and 30.36 Kg water to form a first coating solution.
~nto a fluidized bed was placed 12.25 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air and the bed heated to 63-71 C. The entire amount of first coating solution was sprayed onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941~ at an atomized air pressure of 40 psig, to form once coated CDB-56 particles.
Into the now empty 32 liter container ~as placed 2.27 Kg KhUCEL J, a hydroxypropylcellulose purchased from Hercules, Inc., and 70.94 Kg water to form a second coating solution.
The bed temperature was adjusted to 69-71 C. and the entire amount of second coating solution sprayed onto the once coated CDB-56 par~ticles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C.
and the protectively encaps~ulated~ CDB-56 particles dried.
The~ process yielded~21~.91 Kg of ~protectively encapsulated CDB-56 particles comprising 5~0 wt-% core of CDB-56~ 45 wt-~flrs;t coat of a m~ixture~of 71 wt-% sodium sulfate and 29 wt-~
sodium tripolyphosphate hexahydrate and 5 wt-% second coat of KLUCEL J.
: :
:
-" ~3`"~
Exam~le_IV
Into a 32 liter container was placed 2.38 Kg granular sodium sulfate, 0.79 Kg sodium tripolyphosphate hexahydrate and 9.50 Kg water to form a first coating solution.
~ 5 Into a fluidized bed was placed 5.83 Kg CDB-56, a - granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air heated to 61 C. The entire amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941 to at an atomization air pressure of 30 psi to form once coated CDB-56 particles.
Into the now empty 32 liter container was placed 0.45 Kg of a blend of 66 Wt-% Lr Natrosol 250 and 34 Wt-~ Natrosol 250, both of which are hydroxyethylcelluloses purchased from Hercules, Inc., and 22.7 Kg water to form a second coating solution. The bed temperature was adjusted to an average of 70 C. and the entire amount of second coating solution sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C. and the protectively encapsulated CDB-56 particles dried. The process yielded 8.89 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-~ core of CDB-56, 35 wt-% first coat of a ` mixture of 75 wt-% sodium sulfate and 25 wt-% sodium ` tripolyphosphate hexahydrate and 5 wt-% second coat o~
hydroxyethylcellulose.
Example V
30~ Into a 32~liter container was placed 2.38 Kg granular sodium sulfate, 0.79 Kg sodium tripolyphosphate hexahydrate and 9.5 Kg water to form a first coàting solution.
Into a fluidized bed was placed 5.83 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was rluiùized with air heated to an average of 6- C. The entire :
:
,, ~ , , , 3~ 7 amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941, at an atomization air pressure of 30 psi to form once CDB-56 coated particles.
Into the now empty 32 liter container was placed 0.45 Kg Methocel type F4Mr a hydroxypropylmethylcellulose, a methylcellulose purchased from Dow Chemical, Inc., and 22.7 Kg water to form a second coating solution. The bed temperature was adjusted to an average o 71 C. and the entire amount of second coating solution sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The protectively encapsulated CDB-56 particles were then dried. The process yielded 8.87 Kg of protectively encapsulated CDB-56 particles comprising 60 wt~% core of CDB-56, 35 wt-% first coat of a mixture of 75 wt-~ sodium sulfate and 25 wt-% sodium tripolyphosphate hexahydrate and 5 wt-~ second coat of hydroxypropylmethylcellulose.
Exam le VI
Into a 32 Liter container was placed 2.38 Kg granular sodium sulfate, 2.38 Kg sodium tripolyphosphate hexahydrate and 9.5 Kg water to form a first coating solution.
Into a fluidized bed was placed 5.83 ~g CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air heated to 65 C. The entire amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941,~at an atomization air pressure of 30 psi to form once coated C~B-56 par~ticles.~ ~ ~
Into the now~ empty~32 liter~container was placed 4.5 Kg CMC-CLT, a sodium carboxymethylcellulose purchased from Hercul~es, Inc., and 22.7 Kg water to form a second coating ~35 solution. The bed temperature was adjusted to an average of ;~ 71 C. and the entire~ amount of second coating solution : :::: ~ :
: :
.. ,~, .. ~
.
~3~ 7 sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The protectively encapsulated CDB-56 particles were dried. The process yielded 8.98 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-~ core of CDB-56, 35 wt-% first coat of a mixture of 75 wt-% sodium sulfate and 25 wt-%
sodium tripolyphosphate hexahydrate and 5 wt-% second coat of sodium carboxymethyl cellulose.
Example VII
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356. 7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 77 C. and held at that temperature for 70 minutes to form hydrated metasilicate.
The heating means was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 65 C. A premix of 2.2 grams of mono and di alkyl acid phosphate esters rich in C16, 13.8 grams of nonionic ` ethylene propylene oxide block copolymers terminated inpropylene oxide and 399.4 grams of hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. The slurry was then thoroughly mixed and cooled to 56 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example I. The contents of the container were quickly agi~tated for about 10 seconds and then solidified~by cooling. ~
The percent active chlorin~e remainlng~ ln the composition after~ storage~ at 100 Fahrenheit for 2 and 4 weeks was titr~ationally~detérmined~to be~88.4 and 90.0% respectively.
Examp~le VIII
35~ Into a laboratory beaker,~equipped with a stirring means and a heating means~, was placed 234.9 grams of substantially ~: :
,",, ~, . ~ , . : .
~3~6~i7 dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the laboratory beaker were heated to an average temperature of 78 C. and held at that temperature for 69 minutes to form hydrated metasilicate, The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 66 C. A premix of 2.2 grams of mono and dialkyl acid phosphate ester rich in C16, 13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.4 grams hydrated sodium tripolyphosphate containing 19.4 wt-~ water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then thoroughly mixed and cooled to 53 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example II. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling. The percent active chlorine remaining in the composition after storage at 100F for 2 and 4 weeks was titrationally determined to be 82.2~ and 84.5%
respectively.
Example IX
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by~356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 78 C. and held at that temperature for 57 minutes to ~orm hydrated metasilicate.
The heat source was then removed from the reaction vessel and ; 30 the temperature of~the hydrated metasilicate allowed to fall below 66 C. A premix of 2.2~grams of mono and dialkyl acid phosphate esters~rich;in C16,~13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.~ grams of hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then :'''' ' :
13~Çi6S7 thoroughly mixed and cooled to 52 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example III. The contents of the S container were quickly agitated for about 10 seconds and then ; solidified by cooling.
The percent active chlorine remaining in the composition after storage at 100F. for 2 and 4 weeks was titrationally determined to be 89.4~ and 89.2~ respectively.
Exam~le X
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 86 C. and held at that ; temperature for 80 minutes to form hydrated metasilicate.
The heating means was then removed from the reaction vessel `and the temperature of the hydrated metasilicate allowed to fall below 63 C. A premix of 2.3 grams of mono and dialkyl acid phosphate esters rich in C16, 13.9 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt% water was added to the hydrated metasilicate to form a slurry. This slurry was then 25 ~thoroughly mixed~ and cooled to 56 C. 97.5 grams of the slurry~was ~then poured ~ into a 0.1 liter container slmultaneously wi~th 2.5 g~rams~of the en~capsulated bleach made in~accordanc~e~with~Example~IV~. The contents of the container wer~`quick~ly~ agit~ated for ~about 10 seconds and then 30 ~solidified~by cooling. ;~
The~per~ent~active~ chlorine~remaining~ in the composition a~te~r~storage at `1~0~F for 2 and 4 weèks~was titrationally déte~rmined~to~be~91.5~ and~ a4~. 6%~respectiv~e;1y.
Example~XI
35~ Into a 1aboratory beakèr, equipped with a stirring means and~a~heating meanst was placed 234.9 grams; of substantially : ~ :: : :, :~3~ j7 dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 73 C. and held at that temperature for 62 minutes to form hydrated metasilicate.
The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 61 C. A premix of 2.3 grams of mono and dialkyl acid phosphate ester rich in C16, 13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then thoroughly mixed and cooled to 50 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneousl~ with 2.5 grams of the encapsulated bleach made in accordance with Example V. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling.
The percent active chlorine remaining in the composition after storage at 100F for 2 weeks was titrationally determined to be 84.1%.
Example XII
~Into a laboratory beaker, equipped with a stirring means - and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 77 C. and held at that temperature for 65 minutes to form hydrated metasilicate.
;The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 60 C. A; premi~ of 2.3 grams of mono and dialkyl acid phosphate ester rich in C16,~13.9 grams of nonionic ethylene propylene oxide~b~lock copo~lymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt-% water;of hydration was added to the hydrated metasilicate to form a sIurry. This slurry was then .
:
: :
~3~
thoroughly mixed and cooled to 50 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2O5 grams of the encapsulated bleach made in accordance with Example VI. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling.
: The percent active chlorine remaining in the composition after storage at 100F for 2 weeks was titrationally de~ermined to be 92~.
:
:, :` :
:
:
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:
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Field of the Invention This invention relates to encapsulated bleaching agents having improved bleach stability in alkaline environments.
Backqround of the Invention Bleaches are a well known group of chemical agents having the unique ability to remove color from a substrate without damaging the substrate. Because of this unique ability bleaches are often incorporated into cleaning compositions as a stain remover. However, most bleaching agents are unstable in typical cleaning compositions due to the alkaline conditions and/or the presence of free moisture.
Various attempts have been made to create a source of bleach which would be stable in~ cleaning compositions including numerous attempts to encapsulate the bleach in various coating compounds. Unfortunately, the encapsulated ! ~ 20 bleaches developed so far are either (i) substantially unstable in highly alkaline environments ~uch as found in solid cast detergents, (ii) difficult to manufacture, and/or (iii) prohibitavely expensive to manufacture.
Accordingly, a substantial need exists for an inexpensive, easily manufactured source of bleach that is stable in a highly alkaline environment.
Summary of the Invention I have discovered~ a source of bleach which can remain stable ~or extended periods of;~time in a highly alkaline 30~environment. The source~of bl~each comprises~ a bleach core encapsulated by an inner coating of a~ chemically compatible, separat~ing compound~and an~outer~ coati~ng ~of a water~soluble ce~l~lulose ether~selected-from th~e group consisting of (Cl_4) alkyl~ celluloses~,~ carboxy ~(Cl 4) alkyl celluloses, hydroxy (C1_4j~alkyl ~oelluloses, carboxy (Cl_4) alkyl hydroxy (Cl_4) alkyl~celluloses,~ (Cl_4)~ alkyl hydroxy (Cl 4) alkyl . , 13~6~7 celluloses and mixtures thereof.
I have discovered that while a bleach core can be effectively protected against an alkaline environment by a single coating of one of the listed water soluble cellulose ethers, the cellulose ether can itself, under the proper conditions, react with and deactivate the bleach core.
Accordingly, I have found it preferable to employ an inner coating of a chemically compatable compound to separate the bleach core from the cellulose ether outer coating.
As utilized herein, including the claims, "inner coating" refers to that coating layer in physical contact with the core material.
Detailed Description of the Invention Including a_Best Mode My stable bleaching composition comprises a bleach core encapsulated in an inner coating of a bleach compatable separating compound and an outer coating of a water soluble cellulose ether.
BLEACHING AGENT
Bleaches suitable for use as the core component include any of the well known bleaching agents capabIe of removing stains from such substrates as dishes, flatware, pots and pans, textiles, countertops, appliances, flooring, etc.
without significantly damaging the substrate. A nonlimiting list of such bleaches includes active halogen releasing bleaches such as hypochlorites, chlorites, chlorinated phosphates, chloroisocyanates, chloroamines etc.; and peroxide compounds such~as ~hydrogen peroxide, perborates, ; ~ percarbonates etc. Preferred bleaches include those bleachec which~ liberate an active halogen species such as Cl , Br , OCl , or OBr under conditions~ normally encountered in ~ typical cleaning processes~ Most preferably, the bleaching ; agent reIeases Cl or OCl . A nonlimiting list of useful ; chlorine releasing bleqches ~incIudes calcium hypochlorite, lithium hypochlorite, chlorinated trisodium phosphate, sodium dichloroisocyanurate, potassium dichloroisocyanurate, ~: .
, ,~ . : .
~3~ 7 , .`
[(monotrichloro)-tetra(monopotassium dichloro)]
pentaisocyanurate, monochloroamine, dichloroamine, trichloromelamine, sulfondichloro-amide, 1,3-dichloro-5,5-dimethyl hydantoin, n-chloroammeline, n chlorosuccinimide, n,n'-dichloroazodicarbonimide, n,n-chloroacetyl urea, n,n'-dichlorobiuret, chlorinated dicyanamide, trichlorocyanuric acid, and hydrates thereof.
Because of their low cost and high bleaching efficiency the most preferred bleaching agents are the alkali metal salts of chloroisocyanurates and the hydrates thereof.
SEPARATING COMPOUND;~
Compounds suitable for use as the inner coating component include any compound which is solid at those temperatures likely to be encountered during storage of the encapsulated bleach (i~e. -5 to 50C), is chemically compatible with (i.e. does not react with) either the bleaching agent core or the water soluble cellulose ether outer coating, and is capable of separating the bleaching -I agent from the cellulose ether so as to prevent deactivation of the bleach by the cellulose ether. Useful separating compounds include specifically but not exclusively water insoluble compounds such as C 11 - 30 fatty acids, waxes and water soluble compounds such as alkyl sulfonates, detergent builders and detergent fillers. Because of their ability to readily release the bleach core under conditions typically encountered during detergent use, the water soluble compounds are preferered. Most preferably, the separating compound is an inorganic~ detergent builder or filler useful in the cleaning compoæition into which the bleach is to be employed.
30~ A nonlimiting list of such ~detergent builders and fillers includes inorganlc compounds~such as sodium sulfate, sodium ; ~ ; ; chloride, tetrasodium pyrophosphate, alkali metal silicates, tetrapotassium ~pyrophosphate, pentasodium tripolyphosphate, pentapo~tassium tripolyphosphate, sodium~ sequicarbonate, 35 ~potassium sequicar~bonate, phytates, etc. Because of their ~ low ~cost, ease~of~ availability,~ ease of use and efficient :'. ~ ' ~ .
~3~6~57 detergent building properties the inner coating compound preferably comprises a mixture of sodium sulfate and a tripolyphosphate.
WATER SOLUBLE CELLULOSE ETHERS
Cellulose is a liner polymer of anhydroglucose units held together by glucosidic linkages. Each anhydroglucose unit contains three hydroxyl groups - one primary and two secondary. Cellulose derivatives such as cellulose ethers are formed by reaction of the cellulose with a chemical reagent at these hydroxyl groups. For example, hydroxyethylcellulose can be prepared by the reaction of alkali cellulose with ethylene oxide in the presence of isopropanol, tert~butanol or acetone in accordance with the following equation:
R 11 loseOH + CH2 - C~2 _ - RcelluloseC 2 2 o Cellulose derivatives useful as the outer coating component in the present invention are the water soluble cellulose ethers selected from the group consisting of (Cl 4) alkyl cellulose, carboxy (Cl~4) alkyl cellulose, hydroxy (Cl 4) alkyl cellulose di(Cl 4) alkyl carboxy (Cl 4) hydroxy (Cl_4) cellulose,~(Cl_4) alkyl hydroxy (Cl_4) alkyl cellulose and mixtures thereof. For reasons of superior bleach stabilizing performance and ease of application, the preferred~ cellulose ethers are the hydroxy (Cl 4) alkyl celluloses with the most preferred cellulose ethers being hydroxyethylcellulose and hydroxy-propylcellulose.
In most commercially available cellulose derivatives, some of the hydroxyl~groups a~re not substituted. The number of~unsubstituted hydroxyl groups is known as the degree of substitution (DS) and is designated by a number from 0 to 3 which represents the average number of~ hydroxyl groups, of the~ three available in the anhydroglucose unit, that have been substituted.~ `
, ~ , :
~ :~3~665~ -A special problem arises in the expression of degree of substitution for hydroxyalkyl derivatives because each time a hydroxyalkyl substituent is added, a new reactive hydroxyl group is formed and the number of reactive hydroxyl sites does not change. The result is the formation of side chains, as shown below:
R 11 loseH + CH2 CH2 ~ RCellulose 2 2 R 11 1 seCH2CH2H ~ CH2 C~2 ~ RcellUlosecH2c 2 2 2 O
To describe the extent of the formation of side chains the term MS has been coined. MS is defined as the number of moles of reagent (i.e. ethylene oxide) combined per anhydroglucose unit.
The ratio of DS to MS is an indication of the average length of the side chains developed. The DS, MS and ratio of DS to MS can affect the chemical properties of the cellulose derivative and only those cellulose ethers that have a DS, MS
and DS:MS which result in a water soluble compound may be usefully employed in the present invention.
The DS o~ several useful cellulose ethers are set forth below:
Table_l . ~
; ~ ~ Cellulose Typical DS : Preferred DS
: :~ydroxymethyl ; 0-2.6 ~ : : 1.3-2.6 Hydroxyethyl ~ 0-3 1.2-3 Hydroxypropyl ~ 1.4 3 ~ 1.4-3 Carboxymethyl 0.4-1.4 : ~ 0.7-0.9 The composition~:can comprise about 20 to 90 wt-%, ; : 35 preferably about 40 ~to 70 wt-% bleach core, about 5 to 60 wt-%, preferably :about lO to 50 wt-~ separating compound ~,,,~, ~3~6~7 inner coating and about l to 25 wt-%, preferably about 2 to l0 wt-% water soluble cellulose ether outer coating.
While not intending to be limited thereby I believe that the water soluble cellulose ethers described herein are capable of protecting a bleaching agent core from deactivation in an alkaline environment because the cellulose ethers are water insoluble when in the presence of at least about l0-50 wt-% inorganic salts such as sodium chloride, sodium sulphate, sodium perborate, etc. (i.e. those conditions typically encountered in solid detergents) and ~; water soluble only when the wt-% of inorganic salt falls outside these levels (i.e. those conditions typically encountered during use of the detergent).
ENCAPSULATION_PROCEDURE
15The bleach may be encapsulated in any convenient manner capable of ensuring complete coating of the bleach.
Obtaining a complete protective coating with the cellulose ether is simplified by the tendency of cellulose ethers to naturally form ~a nonporous, evenly distributed coating on a particle. For reasons of low manufacturing cost and ease of manufacture the bleach is preferably encapsulat~d in a fluidized bed as set forth in detail in the Examples.
Briefly, the separating composition is dissolved in an appropriate solvent, such as water when water soluble, to form an inner coating solution; the water soluble cellulose eth~er dissolved in water to form an outer coating solution;
the bIeach particles fluidized in a fluidized bed apparatus, ` the~ inner~ coating solution ~sprayed onto~ the fluidized particles and~dried, and~the~outer coating solution sprayed 30 ~on~the flu~idized~particles~and d~r1ed.
Exampl`e I
Into a ~ 32~ ter conta~1ner~ was placed ;5.96 Kg granular sodium sulfate, ~1.62 Kg sodium tr~i~olyphosphate and 23.78 Kg water~to form a first coating~solution~.
35~Into~ a fl~u~idized bed ~was~ placed 14.59 Kg CDB-56, a gr~anular dichloroisocyanurate~ dihydrate purchased from FMC
.~ ~
- .
: , .~ .
~3~
, . , and now available from Olin Corporation. The CD3-56 was fluidized with air and the bed heated to 68-79 C. The entire amount of first coating solution was sprayed onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941, at an atomization air pressure of 40 psig, to form once coated CDB-56 particles.
Into the now empty 32 liter container was placed 1.14 Kg KLUCEL J,* a hydroxypropylcellulose purchased from Hercules, Inc., and 34.47 Kg water to form a second coating solution.
The bed temperature was adjusted to 71-72 C. and the entire amount of second coating solution sprayed onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C.
and the protectively encapsulated CDB-56 particles dried.
The process yielded 23.15 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-% core of CDB-56, 35 wt-%
first coat of a mixture of 75 wt-~ sodium sulfate and 25 wt-%
sodium tripolyphosphate hexahydrate and 5 wt-~ second coat of KLUCEL J.
ExamDle II
Into a 32 liter container was placed 5.96 Kg granular sodium sulfate, 1.62 Kg sodium tripolyphosphate and 23.78 Kg water to form a first coating solution.
Into a fluidized bed was placed 13.43 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air and the bed heated to 72-74 C. The entire amount of first coating solution was sprayed onto the 30 CDB-56 granules through a Gustav Schlick Nozzle Model, 941 at an atomized air pressure of 40 psig, to ~orm once CDB-56 coated particles.
Into the now empty 32 liter container was placed 2.27 Kg KLUCEL J~, a hydroxypropylcellulose purchased from ~ercules, Inc., and 70.94 Kg water to form a second coating solution.
The bed temperature was adjusted to 69-71 C. and the entire *Trade-mark ;
A
.
-- :13~6~
amount of second coating solution sprayed onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74O r.
and the protectively encapsulated CDB-56 particles dried.
The process yielded 20.14 Kg of protectively encapsulated CDB-56 particles comprising 55 wt-% core of CDB-56, 35 wt-%
first coat of a mixture of 75 wt-% sodium sulfate and Z5 wt-%
sodium tripolyphosphate hexahydrate and 10 wt-% second coat of KLUCEL J.
Example III
Into a 32 liter container was placed 7. 26 Kg sodium sulfate, 2.42 Kg sodium tripolyphosphate and 30.36 Kg water to form a first coating solution.
~nto a fluidized bed was placed 12.25 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air and the bed heated to 63-71 C. The entire amount of first coating solution was sprayed onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941~ at an atomized air pressure of 40 psig, to form once coated CDB-56 particles.
Into the now empty 32 liter container ~as placed 2.27 Kg KhUCEL J, a hydroxypropylcellulose purchased from Hercules, Inc., and 70.94 Kg water to form a second coating solution.
The bed temperature was adjusted to 69-71 C. and the entire amount of second coating solution sprayed onto the once coated CDB-56 par~ticles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C.
and the protectively encaps~ulated~ CDB-56 particles dried.
The~ process yielded~21~.91 Kg of ~protectively encapsulated CDB-56 particles comprising 5~0 wt-% core of CDB-56~ 45 wt-~flrs;t coat of a m~ixture~of 71 wt-% sodium sulfate and 29 wt-~
sodium tripolyphosphate hexahydrate and 5 wt-% second coat of KLUCEL J.
: :
:
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Exam~le_IV
Into a 32 liter container was placed 2.38 Kg granular sodium sulfate, 0.79 Kg sodium tripolyphosphate hexahydrate and 9.50 Kg water to form a first coating solution.
~ 5 Into a fluidized bed was placed 5.83 Kg CDB-56, a - granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air heated to 61 C. The entire amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941 to at an atomization air pressure of 30 psi to form once coated CDB-56 particles.
Into the now empty 32 liter container was placed 0.45 Kg of a blend of 66 Wt-% Lr Natrosol 250 and 34 Wt-~ Natrosol 250, both of which are hydroxyethylcelluloses purchased from Hercules, Inc., and 22.7 Kg water to form a second coating solution. The bed temperature was adjusted to an average of 70 C. and the entire amount of second coating solution sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice coated, protectively encapsulated CDB-56 particles. The bed temperature was then adjusted to 74 C. and the protectively encapsulated CDB-56 particles dried. The process yielded 8.89 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-~ core of CDB-56, 35 wt-% first coat of a ` mixture of 75 wt-% sodium sulfate and 25 wt-% sodium ` tripolyphosphate hexahydrate and 5 wt-% second coat o~
hydroxyethylcellulose.
Example V
30~ Into a 32~liter container was placed 2.38 Kg granular sodium sulfate, 0.79 Kg sodium tripolyphosphate hexahydrate and 9.5 Kg water to form a first coàting solution.
Into a fluidized bed was placed 5.83 Kg CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was rluiùized with air heated to an average of 6- C. The entire :
:
,, ~ , , , 3~ 7 amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941, at an atomization air pressure of 30 psi to form once CDB-56 coated particles.
Into the now empty 32 liter container was placed 0.45 Kg Methocel type F4Mr a hydroxypropylmethylcellulose, a methylcellulose purchased from Dow Chemical, Inc., and 22.7 Kg water to form a second coating solution. The bed temperature was adjusted to an average o 71 C. and the entire amount of second coating solution sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The protectively encapsulated CDB-56 particles were then dried. The process yielded 8.87 Kg of protectively encapsulated CDB-56 particles comprising 60 wt~% core of CDB-56, 35 wt-% first coat of a mixture of 75 wt-~ sodium sulfate and 25 wt-% sodium tripolyphosphate hexahydrate and 5 wt-~ second coat of hydroxypropylmethylcellulose.
Exam le VI
Into a 32 Liter container was placed 2.38 Kg granular sodium sulfate, 2.38 Kg sodium tripolyphosphate hexahydrate and 9.5 Kg water to form a first coating solution.
Into a fluidized bed was placed 5.83 ~g CDB-56, a granular dichloroisocyanurate dihydrate purchased from FMC
and now available from Olin Corporation. The CDB-56 was fluidized with air heated to 65 C. The entire amount of first coating solution was sprayed over the spray period onto the CDB-56 granules through a Gustav Schlick Nozzle Model 941,~at an atomization air pressure of 30 psi to form once coated C~B-56 par~ticles.~ ~ ~
Into the now~ empty~32 liter~container was placed 4.5 Kg CMC-CLT, a sodium carboxymethylcellulose purchased from Hercul~es, Inc., and 22.7 Kg water to form a second coating ~35 solution. The bed temperature was adjusted to an average of ;~ 71 C. and the entire~ amount of second coating solution : :::: ~ :
: :
.. ,~, .. ~
.
~3~ 7 sprayed over the spray period onto the once coated CDB-56 particles through the Gustav Schlick nozzle to form twice-coated, protectively encapsulated CDB-56 particles. The protectively encapsulated CDB-56 particles were dried. The process yielded 8.98 Kg of protectively encapsulated CDB-56 particles comprising 60 wt-~ core of CDB-56, 35 wt-% first coat of a mixture of 75 wt-% sodium sulfate and 25 wt-%
sodium tripolyphosphate hexahydrate and 5 wt-% second coat of sodium carboxymethyl cellulose.
Example VII
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356. 7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 77 C. and held at that temperature for 70 minutes to form hydrated metasilicate.
The heating means was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 65 C. A premix of 2.2 grams of mono and di alkyl acid phosphate esters rich in C16, 13.8 grams of nonionic ` ethylene propylene oxide block copolymers terminated inpropylene oxide and 399.4 grams of hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. The slurry was then thoroughly mixed and cooled to 56 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example I. The contents of the container were quickly agi~tated for about 10 seconds and then solidified~by cooling. ~
The percent active chlorin~e remainlng~ ln the composition after~ storage~ at 100 Fahrenheit for 2 and 4 weeks was titr~ationally~detérmined~to be~88.4 and 90.0% respectively.
Examp~le VIII
35~ Into a laboratory beaker,~equipped with a stirring means and a heating means~, was placed 234.9 grams of substantially ~: :
,",, ~, . ~ , . : .
~3~6~i7 dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the laboratory beaker were heated to an average temperature of 78 C. and held at that temperature for 69 minutes to form hydrated metasilicate, The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 66 C. A premix of 2.2 grams of mono and dialkyl acid phosphate ester rich in C16, 13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.4 grams hydrated sodium tripolyphosphate containing 19.4 wt-~ water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then thoroughly mixed and cooled to 53 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example II. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling. The percent active chlorine remaining in the composition after storage at 100F for 2 and 4 weeks was titrationally determined to be 82.2~ and 84.5%
respectively.
Example IX
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by~356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 78 C. and held at that temperature for 57 minutes to ~orm hydrated metasilicate.
The heat source was then removed from the reaction vessel and ; 30 the temperature of~the hydrated metasilicate allowed to fall below 66 C. A premix of 2.2~grams of mono and dialkyl acid phosphate esters~rich;in C16,~13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.~ grams of hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then :'''' ' :
13~Çi6S7 thoroughly mixed and cooled to 52 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2.5 grams of the encapsulated bleach made in accordance with Example III. The contents of the S container were quickly agitated for about 10 seconds and then ; solidified by cooling.
The percent active chlorine remaining in the composition after storage at 100F. for 2 and 4 weeks was titrationally determined to be 89.4~ and 89.2~ respectively.
Exam~le X
Into a laboratory beaker, equipped with a stirring means and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 86 C. and held at that ; temperature for 80 minutes to form hydrated metasilicate.
The heating means was then removed from the reaction vessel `and the temperature of the hydrated metasilicate allowed to fall below 63 C. A premix of 2.3 grams of mono and dialkyl acid phosphate esters rich in C16, 13.9 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt% water was added to the hydrated metasilicate to form a slurry. This slurry was then 25 ~thoroughly mixed~ and cooled to 56 C. 97.5 grams of the slurry~was ~then poured ~ into a 0.1 liter container slmultaneously wi~th 2.5 g~rams~of the en~capsulated bleach made in~accordanc~e~with~Example~IV~. The contents of the container wer~`quick~ly~ agit~ated for ~about 10 seconds and then 30 ~solidified~by cooling. ;~
The~per~ent~active~ chlorine~remaining~ in the composition a~te~r~storage at `1~0~F for 2 and 4 weèks~was titrationally déte~rmined~to~be~91.5~ and~ a4~. 6%~respectiv~e;1y.
Example~XI
35~ Into a 1aboratory beakèr, equipped with a stirring means and~a~heating meanst was placed 234.9 grams; of substantially : ~ :: : :, :~3~ j7 dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 73 C. and held at that temperature for 62 minutes to form hydrated metasilicate.
The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 61 C. A premix of 2.3 grams of mono and dialkyl acid phosphate ester rich in C16, 13.8 grams of nonionic ethylene propylene oxide block copolymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt-% water of hydration was added to the hydrated metasilicate to form a slurry. This slurry was then thoroughly mixed and cooled to 50 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneousl~ with 2.5 grams of the encapsulated bleach made in accordance with Example V. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling.
The percent active chlorine remaining in the composition after storage at 100F for 2 weeks was titrationally determined to be 84.1%.
Example XII
~Into a laboratory beaker, equipped with a stirring means - and a heating means, was placed 234.9 grams of substantially dimineralized water followed by 356.7 grams anhydrous sodium metasilicate. The contents of the reaction vessel were heated to an average temperature of 77 C. and held at that temperature for 65 minutes to form hydrated metasilicate.
;The heat source was then removed from the reaction vessel and the temperature of the hydrated metasilicate allowed to fall below 60 C. A; premi~ of 2.3 grams of mono and dialkyl acid phosphate ester rich in C16,~13.9 grams of nonionic ethylene propylene oxide~b~lock copo~lymers terminated in propylene oxide and 399.2 grams hydrated sodium tripolyphosphate containing 19.4 wt-% water;of hydration was added to the hydrated metasilicate to form a sIurry. This slurry was then .
:
: :
~3~
thoroughly mixed and cooled to 50 C. 97.5 grams of the slurry was then poured into a 0.1 liter container simultaneously with 2O5 grams of the encapsulated bleach made in accordance with Example VI. The contents of the container were quickly agitated for about 10 seconds and then solidified by cooling.
: The percent active chlorine remaining in the composition after storage at 100F for 2 weeks was titrationally de~ermined to be 92~.
:
:, :` :
:
:
. : ~: ~ :
:
: : , :
:`
Claims (17)
1. An encapsulated bleach particle, comprising:
(a) a bleaching agent core;
(b) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (c) an outer coating of encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-C4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof.
(a) a bleaching agent core;
(b) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (c) an outer coating of encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C1-4) alkyl cellulose, carboxy (C1-4) alkyl cellulose, hydroxy (C1-4) alkyl cellulose, carboxy (C1-4) alkyl hydroxy (C1-C4) alkyl cellulose, (C1-4) alkyl hydroxy (C1-4) alkyl cellulose, and mixtures thereof.
2. The encapsulated particle of claim 1 wherein the bleaching agent is a source of active halogen.
3. The encapsulated particle of claim 2 wherein the bleaching agent is a source of active chlorine.
4. The encapsulated particle of claim 3 wherein the bleaching agent is an alkali metal dichloroisocyanurate, and hydrates thereof.
5. The encapsulated particle of claim 1 wherein the separating compound is a water soluble detergent builder or filler.
6. The encapsulated particle of claim 5 wherein the detergent builder or filler is sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof.
7. The encapsulated particle of claim 5 wherein the water soluble cellulose ether is a hydroxy (C1-4) alkyl cellulose.
8. The encapsulated particle of claim 7 wherein the hydroxy (C1-4) alkyl cellulose is hydroxypropylcellulose
9. The encapsulated particle of claim 7 wherein the hydroxy (C1-4) alkyl cellulose is hydroxyethylcellulose.
10. The encapsulated particle of claim 7 wherein the hydroxy (C1-4) alkyl cellulose has a DS of about 0.7 to 3Ø
11. The encapsulated particle of claim 8 wherein the hydroxypropylcellulose has a DS of about 1.4 to 3Ø
12. The encapsulated particle of claim 9 wherein the hydroxyethylcellulose has a DS of about 1.2 to 3Ø
13. The encapsulated particle of claim 1 wherein the encapsulated particle comprises about 20-90 wt-% core, about 50-60 wt-% inner coating and about 1-25 wt-% outer coating.
14. The encapsulated particle of claim 1 wherein the encapsulated particle comprises about 40-70 wt-% core, about 10-50 wt-% inner coating compound and about 2-10 wt-% outer coating compound.
15. An encapsulated bleach particle, comprising:
(a) about 20-90 wt-% core of an active chlorine source;
(b) about 5-60 wt-% inner coating of a detergent builder or filler surrounding and in physical contact with the core; and (c) about 1-25 wt-% outer encapsulating coating of a hydroxy (C1-4) alkyl cellulose which is physically separated from the core of active chlorine source by the inner coating.
(a) about 20-90 wt-% core of an active chlorine source;
(b) about 5-60 wt-% inner coating of a detergent builder or filler surrounding and in physical contact with the core; and (c) about 1-25 wt-% outer encapsulating coating of a hydroxy (C1-4) alkyl cellulose which is physically separated from the core of active chlorine source by the inner coating.
16. The particle of claim 13 wherein the particle comprises:
(a) about 40-70 wt-% core;
(b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxypropylcellulose.
(a) about 40-70 wt-% core;
(b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxypropylcellulose.
17. The particle of claim 13 wherein the particle comprises:
(a) about 40-70 wt-% core;
(b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxyethylcellulose.
(a) about 40-70 wt-% core;
(b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxyethylcellulose.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/071,788 US4830773A (en) | 1987-07-10 | 1987-07-10 | Encapsulated bleaches |
US07/071,788 | 1987-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1306657C true CA1306657C (en) | 1992-08-25 |
Family
ID=22103605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000571624A Expired - Lifetime CA1306657C (en) | 1987-07-10 | 1988-07-08 | Encapsulated bleaches |
Country Status (9)
Country | Link |
---|---|
US (1) | US4830773A (en) |
EP (1) | EP0298222B1 (en) |
JP (1) | JPH07103396B2 (en) |
KR (1) | KR950003847B1 (en) |
AU (1) | AU613365B2 (en) |
CA (1) | CA1306657C (en) |
DE (1) | DE3853381T2 (en) |
DK (1) | DK255288A (en) |
NZ (1) | NZ224611A (en) |
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-
1987
- 1987-07-10 US US07/071,788 patent/US4830773A/en not_active Expired - Lifetime
-
1988
- 1988-05-10 DK DK255288A patent/DK255288A/en not_active Application Discontinuation
- 1988-05-11 EP EP88107569A patent/EP0298222B1/en not_active Expired - Lifetime
- 1988-05-11 DE DE3853381T patent/DE3853381T2/en not_active Expired - Lifetime
- 1988-05-11 AU AU16042/88A patent/AU613365B2/en not_active Expired
- 1988-05-13 NZ NZ224611A patent/NZ224611A/en unknown
- 1988-07-08 JP JP63170771A patent/JPH07103396B2/en not_active Expired - Lifetime
- 1988-07-08 CA CA000571624A patent/CA1306657C/en not_active Expired - Lifetime
- 1988-07-08 KR KR1019880008474A patent/KR950003847B1/en not_active IP Right Cessation
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KR950003847B1 (en) | 1995-04-20 |
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DK255288A (en) | 1989-01-11 |
US4830773A (en) | 1989-05-16 |
DK255288D0 (en) | 1988-05-10 |
AU613365B2 (en) | 1991-08-01 |
DE3853381T2 (en) | 1995-12-21 |
EP0298222A2 (en) | 1989-01-11 |
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