EP0544490A1 - Detergent bleach compositions - Google Patents
Detergent bleach compositions Download PDFInfo
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- EP0544490A1 EP0544490A1 EP92310719A EP92310719A EP0544490A1 EP 0544490 A1 EP0544490 A1 EP 0544490A1 EP 92310719 A EP92310719 A EP 92310719A EP 92310719 A EP92310719 A EP 92310719A EP 0544490 A1 EP0544490 A1 EP 0544490A1
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- 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
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3902—Organic or inorganic per-compounds combined with specific additives
- C11D3/3905—Bleach activators or bleach catalysts
- C11D3/3932—Inorganic compounds or complexes
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- 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
Abstract
Detergent bleach compositions are disclosed comprising a surface active material, a peroxide bleaching agent and a dinuclear manganese complex as the bleach catalyst, characterised in that the composition comprises from 0-25% by weight of anionic surfactant and from 7.5-55% by weight of nonionic surfactant, the weight ratio of nonionic surfactant to anionic surfactant being at least 0.75 if the composition contains not more than 7.5% by weight of a carbonate, expressed as sodium carbonate, and at least 2.2. if the composition contains more than 7.5% by weight of a carbonate.
Description
- This invention relates to detergent bleach compositions. More particularly, it relates to improved detergent bleach compositions, especially but not exclusively adapted for washing and cleaning of fabrics, containing, a surfactant material, a peroxide bleaching agent and a manganese complex as bleach catalyst.
- The manganese complex used in the present invention is a dinuclear manganese complex of the formula:
wherein Mn is manganese which can individually be in the III or IV oxidation state; X₁, X₂ and X₃ each independently represent a coordinating or bridging species selected from the group consisting of H₂O, O₂²⁻, O²⁻, OH⁻, HO₂⁻, SH⁻, S²⁻, >SO, Cl⁻, N³⁻, SCN⁻, RCOO⁻, RSO⁻₃, NH₂⁻ and NR₃, with R being H, alkyl, aryl, both optionally substituted, or R'COO⁻ where R' is alkyl, aryl, both optionally substituted; L is a ligand which is an organic molecule containing at least three nitrogen atoms which coordinates via all or some of the nitrogen atoms to the manganese centres; z denotes the charge of the complex and is an integer which can be positive or negative; Y is a monovalent or multivalent counter-ion, leading to charge neutrality, which is dependent upon the charge z of the complex; and q = z/[charge Y]. - Preferred manganese-complexes are those wherein X₁, X₂ and X₃ are either CH₃COO⁻ or O²⁻ or mixtures thereof and, most preferably, wherein the manganese is in the IV oxidation state and X₁, X₂ and X₃ are O²⁻.
-
- Other preferred complexes are those which comprise two ligands of formula
wherein t is an integer from 2 to 3;
s is an integer from 3 to 4;
u is zero or one;
R¹ and R² are each independently selected from H, alkyl, aryl, both optionally substituted; and
R³ is independently selected from hydrogen, alkyl, aryl, both optionally substituted, with the proviso that a bridging unit R⁴ is formed by one R³ unit from each ligand where
R⁴ is the group CnR⁵R⁶-(D)p-CmR⁵R⁶ where p is zero or one;
D is selected from a heteroatom such as oxygen and NR⁷ or is part of an aromatic or saturated homonuclear or heteronuclear ring,
n is an integer from 1 to 4;
m is an integer from 1 to 4;
with the proviso that n + m <= 4 if p is zero or p is one and D is part of an aromatic or saturated homonuclear or heteronuclear ring; and that n + m <=3 if p is one and D is a heteroatom such as oxygen or NR⁷;
R⁵ and R⁶ are each independently selected from H, NR⁸ and OR⁹, alkyl, aryl, optionally substituted and R⁷, R⁸, R⁹ are each independently selected from H, alkyl, aryl, both optionally substituted. - Examples of suitable ligands in their simplest forms are:
- (i)
- 1,4,7-triazacyclononane;
1,4,7-triazacylclodecane;
1,4,8-triazacycloundecane;
1,5,9-triazacyclododecane.
1,4,7-trimethyl-1,4,7-triazacyclononane
1,4,7-trimethyl-1,4,7-triazacyclodecane;
1,4,8-trimethyl-1,4,8-triazacycloundecane;
1,5,9-trimethyl-1,5,9-triazacyclododecane.
1,2-bis-(4,7-dimethyl-1,4,7-triaza-1,-cyclononyl)ethane. - (ii)
- Tris(pyridin-2-yl)methane;
Tris(pyrazol-1-yl)methane;
Tris(imidazol-2-yl)methane;
Tris(triazol-1-yl)methane. - (iii)
- Tris(pyridin-2-yl)borate;
Tris(triazol-1-yl)borate;
Tris(pyrazol-1-yl)borate;
Tris(imidazol-2-yl)phosphine;
Tris(imidazol-2-yl)borate. - (iv)
- 1,3,5-trisamino-cyclohexane;
1,1,1-tris(methylamino)ethane. - (v)
- Bis(pyridin-2-yl-methyl)amine;
Bis(pyrazol-1-yl-methyl)amine;
Bis(triazol-1-yl-methyl)amine;
Bis(imidazol-2-yl-methyl)amine, - Of these the ligands of group (i) and their carbon-substituted derivatives are especially preferred, particularly:
- (1)
- 1,4,7-trimethyl-1,4,7-triazacyclononane (Me₃TACN), and
- (2)
- 1,2,4,7-tetramethyl-1,4,7-triazacyclononane (Me₄TACN)
- (3)
- 1,2,2,4,7-pentamethyl-1,4,7-triazacyclononane (Me₅TACN)
- (4)
- 2-benzyl-1,4,7-trimethyl-1,4,7-triazacyclononane
- (5)
- 1,2-bis(4,7-dimethyl-1,4,7-triaza-1-cyclonoyl)ethane(Et-bridged(Me₂TACN)₂)
- The type of counter-ion Y for charge neutrality is not critical for the activity of the complex and can be selected from for example any of the following counter-ions : chloride; sulphate; nitrate; methylsulphate; surfactant-anions, such as the long-chain alkylsulphates, alkylsulphonates, alkylbenzenesulphonates, tosylate; trifluormethylsulphonate; perchlorate (C10₄⁻), BPh₄⁻ and PF₆-, though some counter-ions are more preferred than others for reasons of product property and safety.
- However the most preferred manganese complexes as used in the present invention are:
(I) [ (Me₃TACN)MnIV(µ-O)₃MnIV(Me₃TACN) ]²⁺(PF₆⁻)₂
(II) [ (Me₄TACN)MnIV(µ-O)₃MnIV(Me₄TACN) ]²⁺ (PF₆⁻)₂
(III) [ (Me₃TACN)MnIII(µ-O)(µ-OAc)₂MnIII(Me₃TACN) ]²⁺ (PF₆⁻)₂
(IV) [ (Me₄TACN)MnIII(µ-O)(µ-OAc)₂MnIII(Me₄TACN) ]²⁺ (PF₆⁻)₂
(V) [ (Et-bridged(Me₂TACN)₂)MnIIIMnIV(µ-O)₂(µ-OAc) ]²⁺ (ClO₄⁻)₂
which are hereinafter also abbreviated as:
(I) [MnIV₂(µ-O)₃(Me₃TACN)₂] (PF₆)₂
(II) [ MnIV₂(µ-O)₃(Me₄TACN)₂] (PF₆)₂
(III) [MnIII₂(µ-O)(µ-OAc)₂(Me₃TACN)₂] (PF₆)₂
(IV) [MnIII₂(µ-O)(µ-OAc)₂(Me₄TACN)₂] (PF₆)₂
-
- These manganese complexes are reported in Applicant's copending European Patent Specification No's 458 397 and 458 398 as unusually effective bleach and oxidation catalysts. In the further description of the invention they will also be referred to as the "bleach catalyst" or simply "catalyst".
- The invention now relates to detergent bleaching compositions comprising a surface-active material, a peroxide bleaching agent and the above-described dinuclear manganese-complex as bleach catalyst.
- The peroxide bleaching agents are normally compounds which are capable of yielding hydrogen peroxide in aqueous solution. Hydrogen peroxide sources are well known in the art. They,include the alkali metal peroxides, organic peroxides such as urea peroxide, and inorganic persalts, such as the alkali metal perborates, percarbonates, perphosphates, persilicates and persulphates. Mixtures of two or more such compounds may also be suitable. Particularly preferred are sodium perborate tetrahydrate and, especially, sodium perborate monohydrate. Sodium perborate monohydrate is preferred because of its high active oxygen content. Sodium percarbonate may also be preferred for environmental reasons. The amount thereof in the composition of the invention usually will be within the range of about 5-35% by weight, preferably from 10-25% by weight.
- Alkylhydroxy peroxides are another class of peroxide bleaching agents. Examples of these materials include cumene hydroperoxide and t-butyl hydroperoxide.
- Organic peroxyacids may also be suitable as the peroxide bleaching agent. Such materials normally have the general formula:
wherein R is an alkylene or substituted alkylene group containing from 1 to about 20 carbon atoms, optionally having an internal amide linkage; or a phenylene or substituted phenylene group; and Y is hydrogen, halogen, alkyl, aryl, an imido-aromatic or non-aromatic group, a COOH or
group or a quaternary ammonium group. - Typical monoperoxy acids useful herein include, for example:
- (i)
- peroxybenzoic acid and ring-substituted peroxybenzoic acids, e.g. peroxy-α-naphthoic acid;
- (ii)
- aliphatic, substituted aliphatic and arylalkyl monoperoxyacids, e.g. peroxylauric acid, peroxystearic acid and N,N-phthaloylaminoperoxy caproic acid (PAP); and
- (iii)
- 6-octylamino-6-oxo-peroxyhexanoic acid.
- Typical diperoxyacids useful herein include, for example:
- (iv)
- 1,12-diperoxydodecanedioic acid (DPDA);
- (v)
- 1,9-diperoxyazelaic acid;
- (vi)
- diperoxybrassilic acid; diperoxysebasic acid and diperoxyisophthalic acid;
- (vii)
- 2-decyldiperoxybutane-1,4-dioic acid; and
- (viii)
- 4,4'-sulphonylbisperoxybenzoic acid.
- Also inorganic peroxyacid compounds are suitable, such as for example potassium monopersulphate (MPS). If organic or inorganic peroxyacids are used as the peroxygen compound, the amount thereof will normally be within the range of about 2-10% by weight, preferably from 4-8% by weight.
- All these peroxide compounds may be utilized alone or in conjunction with a peroxyacid bleach precursor and/or an organic bleach catalyst.
- Peroxyacid bleach precursors are known and amply described in literature, such as in the British Patents 836,988; 864,798; 907,356; 1,003,310 and 1,519,351; German Patent 3,337,921; EP-A-0185522; EP-A-0174132; EP-A-0120591; and US Patents 1,246,339; 3,332,882; 4,128,494; 4,412,934 and 4,675,393.
- Another useful class of peroxyacid bleach precursors is that of the cationic i.e. quaternary ammonium substituted peroxyacid precursors as disclosed in US Patents 4,751,015 and 4,397,757, in EP-A-284292 and EP-A-331,229. Examples of peroxyacid bleach precursors of this class are:
2-(N,N,N-trimethyl ammonium) ethyl sodium-4-sulphonphenyl carbonate chloride - (SPCC);
N-octyl,N,N-dimethyl-N₁₀-carbophenoxy decyl ammonium chloride - (ODC);
3-(N,N,N-trimethyl ammonium) propyl sodium-4-sulphophenyl carboxylate; and
N,N,N-trimethyl ammonium toluyloxy benzene sulphonate. - A further special class of cationic peroxyacid bleach precursors is formed by the cationic nitriles as disclosed in EP-A-0303520 and in European Patent Specification No.'s 458396 and 464880.
- Any one of these peroxyacid bleach precursors can be used in the present invention, though some may be more preferred than others.
- Of the above classes of bleach precursors, the preferred classes are the esters, including acyl phenol sulphonates and acyl alkyl phenol sulphonates; the acyl-amides; and the quaternary ammonium substituted peroxyacid precursors including the cationic nitriles.
- Examples of said preferred peroxyacid bleach precursors or activators are sodium-4-benzoloxy benzene sulphonate (SBOBS); N,N,N',N'-tetraacetyl ethylene diamine (TAED); sodium-1-methyl-2-benzoyloxy benzene-4-sulphonate; sodium-4-methyl-3-benzoloxy benzoate; SPCC; trimethyl ammonium toluyloxy-benzene sulphonate; sodium nonanoyloxybenzene sulphonate (SNOBS); sodium 3,5,5-trimethyl hexanoyloxybenzene sulphonate (STHOBS); and the substituted cationic nitriles.
- The precursors may be used in an amount of about 1-8%, preferably from 2-5% by weight, of the composition. Organic bleach catalyst most suitable for being utilized here are the so-called suphonimides as disclosed in EP-A-0,453,003 and EP-A-0,446,982.
- The surface-active material normally used in detergent bleach compositions may be naturally derived, such as soap, or a synthetic material selected from anionic, nonionic, amphoteric, zwiterionic, cationic actives and mixtures thereof. Many suitable actives are commercially available and are fully described in the literature, for example in "Surface Active Agents and Detergents", Volumes I and II, by Schwartz, Perry and Berch.
- Typical synthetic anionic surface-actives are usually water-soluble alkali metal salts of organic sulphates and sulphonates having alkyl radicals containing from about 8 to about 22 carbon atoms, the term alkyl being used to include the alkyl portion of higher aryl radicals. Examples of suitable synthetic anionic detergent compounds are sodium and ammonium alkyl sulphates, especially those obtained by sulphating higher (C₈-C₁₈) alcohols produced, for example, from tallow or coconut oil; sodium and ammonium alkyl (C₉-C₁₀) benzene sulphonates, particularly sodium linear secondary alkyl (C₁₀-C₁₅) benzene sulphonates; sodium alkyl glyceryl ether sulphates, especially those esters of the higher alcohols derived from tallow or coconut oil and synthetic alcohols derived from petroleum; sodium coconut oil fatty acid monoglyceride sulphates and sulphonates; sodium and ammonium salts of sulphuric acid esters of higher (C₉-C₁₈) fatty alcohol alkylene oxide, particularly ethylene oxide, reaction products; the reaction products of fatty acids such as coconut fatty acids esterified with isethionic acid and neutralised with sodium hydroxide; sodium and ammonium salts of fatty acid amides of methyl taurine; alkane monosulphonates such as those derived by reacting alpha-olefins (C₈-C₂₀) with sodium bisulphite and those derived by reaction paraffins with SO₂ and C₁₂ and then hydrolysing with a base to produce a random sulphonate; sodium and ammonium C₇-C₁₂ dialkyl sulphosuccinates; and olefin sulphonates, which term is used to describe material made by reacting olefins, particularly C₁₀-C₂₀ alpha-olefins, with SO₃ and then neutralising and hydrolysing the reaction product. The preferred anionic detergent compounds are sodium (C₁₀-C₁₅) alkylbenzene sulphonates, sodium (C₁₆-C₁₈) alkyl ether sulphates.
- Examples of suitable nonionic surface-active compounds which may be used, preferably together with the anionic surface-active compounds, include, in particular, the reaction products of alkylene oxides, usually ethylene oxide, with alkyl (C₆-C₂₂) phenols, generally 5-25 EO, i.e 5-25 units of ethylene oxides per molecule; the condensation products of aliphatic (C₈-C₁₈) primary or secondary linear or branched alcohols with ethylene oxide, generally 2-30 EO, and products may be condensation of ethylene oxide with the reaction products of propylene oxide and ethylene diamine. Other so-called nonionic surface-actives include alkyl polyglycosides, sugar esters, long-chain tertiary amine oxides, long-chain tertiary phosphine oxides and dialkyl sulphoxides.
- Amount of amphoteric or zwitterionic surface-active compounds can also be used in the compositions-of the invention but this is not normally desired owing to their relatively high cost. If any amphoteric or zwitterionic detergent compounds are used, it is generally in small amounts in compositions based on the much more commonly used synthetic anionic and nonionic actives.
- It has been found however, that if the catalysts hereinbefore described are used in detergent bleach compositions their performance is highly dependent upon the active detergent system and the builder system of the composition. Experiments have shown that anionic surfactants in general and long chain C₁₆-C₂₂ fatty acid soaps in particular have a strong negative effect on the catalyst activity, thereby decreasing the performance dramatically, whereas nonionic detergent surfactants do not interact with the catalyst. Short chain C₁₂-C₁₄ fatty acid soaps at lower levels up to about 10% by weight have a positive effect on the catalyst activity, but at high concentrations, e.g. >20% by weight they also become detrimental.
- The mechanism causing these effects is not fully understood, though it can be hypothesized that by some mechanism the catalyst is believed to be (partly) withdrawn from the solution in the presence of anionic surfactants. This may for instance happen by precipitation of the negatively charged actives with the positively charged catalyst molecule or only by ion pair formation which causes catalytic inactivity. Another possibility may be that the catalyst is enclosed in the micelles of the anion-active surfactant.
- Whatever the reason may be, it is clear that the bleach performance of detergent bleach compositions comprising a dinuclear manganese complex catalysed peroxide bleach system, is not optimal if the active detergent system comprises an anionic surface-active material.
- It is therefore an object of the present invention to provide a detergent bleach composition comprising a surface-active material, a peroxide bleaching agent and a dinuclear manganese complex as hereinbefore described having optimal bleaching action.
- It has now surprisingly been found that by including a nonionic surfactant in sufficient amounts it is possible to enhance the bleaching action back to optimal.
- Without wishing to be bound to any theory, it is believed that the nonionic, provided it is present in sufficient amounts, compensates the strong negative effect of anionic surfactants by resolubilization of the catalyst.
- Accordingly the invention provides a detergent bleach composition comprising a surface-active material, a peroxide bleaching agent and a dinuclear manganese complex as the bleach catalyst, which composition is characterized in that it comprises from 0-25% by weight of anionic surfactant and from 7.5-55% by weight of nonionic surfactant, the weight ratio of nonionic surfactant to anionic surfactant being at least 0.75 if the composition contains 0-7.5% by weight of a carbonate builder, expressed as sodium carbonate, and at least 2.2 if the composition contains more than 7.5% by weight of carbonate builder.
- Preferably the composition will comprise from 0-15% by weight of anionic surfactant and from 10-40% by weight of nonionic surfactant.
- In a further preferred embodiment the detergent active system is free from C₁₆-C₂₂ fatty acid soaps. In another preferred embodiment the detergent bleach composition is an all-nonionic based formulation exempt from any anionic surfactant.
- The composition of the invention normally and preferably also contains a detergency builder in an amount of from about 5-80% by weight, preferably from about 10-60% by weight.
- Builder materials may be selected from 1) calcium sequestrant materials, 2) precipitating materials, 3) calcium ion-exchange materials and 4) mixture thereof.
- Examples of calcium sequestrant builder materials include alkali metal polyphosphates, such as sodium tripolyphosphate; nitrilotriacetic acid and its water-soluble salts; the alkali metal salts of carboxymethyloxy succinic acid, ethylene diamine tetraacetic acid, oxydisuccinic acid, mellitic acid, benzene polycarboxylic acids, citric acid; and polyacetal carboxylates as disclosed in US patents 4,144,226 and 4,146,495.
- Examples of precipitating builder materials include sodium orthophosphate and sodium carbonate.
- Examples of calcium ion-exchange builder materials include the various types of water-insoluble crystalline or amorphous aluminosilicates, of which zeolites are the best known representatives, e.g. zeolite A, zeolite B (also known as Zeolite P), zeolite C, zeolite X, zeolite Y and also the zeolite P type as described in EP-A-0,384,070.
- In particular, the compositions of the invention may contain any one of the organic or inorganic builder materials, though, for environmental reasons, phosphate builders are preferably omitted or only used in very small amounts.
- Typical builders usable in the present invention are, for example, sodium carbonate, calcite/carbonate, the sodium salt of nitrilotriacetic acid, sodium citrate, carboxymethyloxy malonate, carboxymethyloxy succinate and the water-insoluble crystalline or amorphous aluminosilicate builder material, each of which can be used as the main builder, either alone or in admixture with other builders or polymers as co-builder.
- As to the builder system, it has been furthermore observed that alkalimetal carbonates and phosphates, especially sodium carbonate, sodium bicarbonate and sodium triphosphate, also have a negative influence on the catalytic bleach performance of hydroperoxide bleaches, but surprisingly, only to a much lesser extent on the catalytic bleach performance of peroxyacid bleaches. The carbonate effect is however pH dependent in that upon increasing the pH to above 10, particularly to 10.5 and above, the negative effect is largely removed.
- Accordingly when using a hydroperoxide, such as sodium perborate or sodium percarbonate, as the bleaching agent, it is preferred that the composition contains not more than 5% by weight of a carbonate builder, expressed as sodium carbonate, more preferable not more than 2.5% by weight to substantially nil, if the composition pH lies in the lower alkaline region of up to 10.
- Apart from the components already mentioned, the detergent compositions of the invention can contain any of the conventional additives in amounts of which such materials are normally employed in fabric washing detergent compositions. Examples of these additives include buffers such as carbonates, lather boosters, such as alkanolamides, particularly the monoethanol amides derived from palmkernel fatty acids and coconut fatty acids; lather depressants, such as alkyl phosphates and silicones; anti-redeposition agents, such as sodium carboxymethyl cellulose and alkyl or substituted alkyl cellulose ethers; stabilizers, such as ethylene diamine tetraacetic acid (EDTA) and the phosphonic acid derivatives (i.e. Dequest ® types); fabric softening agents; inorganic salts and alkaline buffering agents, such as sodium sulphate, sodium silicate etc.; and usually in very small amounts, fluorescent agents; perfumes; enzymes, such as proteases, cellulases, lipases, amylases and oxidases; germicides and colourants.
- When using a hydroperoxide, such as sodium perborate or sodium percarbonate, as the bleaching agent, it is preferred that the composition contains not more than 5% by weight of a carbonate buffer, expressed as sodium carbonate, more preferable not more than 2.5% by weight to substantially nil, if the composition pH lies in the lower alkaline region of up to 10.
- Of the additives, transition metal sequestrants, such as EDTA and the phosphonic acid derivatives, e.g. ethylene diamine tetra- (methylene phosphonate) -EDTMP- are of special importance, as not only do they improve the stability of the catalyst/H₂O₂ system and sensitive ingredients, such as enzymes, fluorescent agents, perfumes and the like, but also improve the bleach performance, especially at the higher pH region of above 10, particularly at pH 10.5 and above.
- Accordingly detergent bleach compositions comprising a surface-active material, a peroxide bleaching agent, the manganese complex bleach catalyst, a carbonate builder and a transition metal sequestrant, having pH in solution of above 10, especially of 10.5 and above, are within the purview of the present invention.
- Also within the purview of the present invention are detergent bleach compositions comprising a surface-active material, a peroxyacid bleach, such as DPDA, PAP and MPS, the bleach catalyst, and a phosphate builder, preferably sodium triphosphate.
- Another optional but highly desirable additive ingredient with multi-functional characteristics in detergent compositions is from 0.1% to about 3% by weight of a polymeric material having a molecular weight of from 1,000 to 2,000,000 and which can be a homo- or co-polymer of acrylic acid, maleic acid, or salt or anhydride thereof, vinyl pyrrolidone, methyl- or ethylvinyl ethers, and other polymerizable vinyl monomers. Preferred examples of such polymeric materials are polyacrylic acid or polyacrylate; polymaleic acid/acrylic acid copolymer; 70:30 acrylic acid/hydroxyethyl maleate copolymer; 1:1 styrene/maleic acid copolymer; isobutylene/maleic acid and diisobutylene/maleic acid copolymers; methyl- and ethylvinylether/maleic acid copolymers; ethylene/maleic acid copolymer; polyvinyl pyrrolidone; and vinyl pyrrolidone/maleic acid copolymer.
- Detergent bleach compositions of the invention, when formulated as free-flowing particles, e.g. in powdered or granulated form, can be produced by any of the conventional techniques employed in the manufacture of detergent compositions, for instance by slurry-making, followed by spray-drying to form a detergent base powder to which the heat-sensitive ingredients including the peroxide compound bleach and optionally some other ingredients as desired, and the bleach catalyst, can be added as dry substances.
- It will be appreciated, however, that the detergent base powder compositions, to which the bleach catalyst is added, can itself be made in a variety of other ways, such as the so-called part-part processing, non-tower route processing, dry-mixing, agglomeration, granulation, extrusion, compacting and densifying processes etc., such ways being well known to those skilled in the art and not forming the essential part of the present invention.
- The invention will now be illustrated by way of the following non-limiting Examples.
- The following examples were carried out in glass vessels, equipped with a temperature controlled heating spiral in quartz, magnetic stirrer, thermo-couple and pH electrode.
- At 40°C isothermal, experiments in demineralised water at pH 10, were carried out to determine the effect of soaps, primary alcohol sulphate (PAS), alkyl benzene sulphonate (ABS), and nonionic surfactant (NI) on the bleach performance of sodium perborate monohydrate (PBM) and [ MnIV₂(µ-O)₃(Me-TACN)₂ ] (PF₆)₂, i.e. complex (I), as the bleach catalyst, on standard tea-stained test cloths.
- The bleach system in the wash solution was added at a concentration of 2.5 µmol/1 catalyst and 8.6 mmol/1 PBM, corresponding to 0.03% by weight of catalyst and 14.3% by weight of PBM if a detergent bleach formulation is dosed at 6 g/1.
- Test cloths were immersed for 30 minutes in each of the compositions of the examples. After rinsing with tap water, the cloths were dried in a tumble drier. The reflectance (R460*.) was measured on a Zeiss Elrephometer before and after treatment. The difference (ΔR460*.) in the value gives a measure of the effectiveness of the treatment.
-
- The results show that when a C₁₈-soap is present in a very low quantity eg. 1:6% by weight there is a detectable decrease in the performance of the catalyst. At 9% by weight C₁₈-soap decreases the performance dramatically from 25 Δ R units to about 9 units. Surprisingly, C₁₂-soap at 9% enhances the catalytic bleach performance up to 29 units. Both synthetic anionic surfactants PAS (at 9%) and ABS (at 9%) also have a strong negative effect on the catalyst activity, decreasing the catalytic bleach performance from 25 units to about 16 units.
- On the other hand 4% of NI hardly influences the catalyst activity.
- This Example shows the effect of nonionic addition on the bleach performance of a formulation containing 9% C₁₈-soap. The experiments were carried out under exactly the same conditions as used in Example 1.
- The results are shown in Table 2
Table 2 present - 9% C₁₈-soap addition - - NI2) NI2) wt.% - - 4 16 Δ R₄₆₀* 25.0 8.7 21.0 25.7 - These results clearly show that addition of 4% NI is not sufficient to adequately improve the bleach performance, whereas an addition of 16% (NI: Anionic ratio of 1:8), enhances the catalytic bleach performance back to optimal approximately 25 ΔR units.
- This Example shows the effect of nonionic addition on the bleach performance of a formulation containing 9% ABS. The experiments were carried out under exactly the same conditions as used in Example II and the results are shown in Table 3.
Table 3 present - 9% ABS addition - - NI2) NI2) wt.% - - 4 8 Δ R₄₆₀* 25.0 16.6 23.9 26.7 - These results clearly show that addition of 4% NI is not sufficient to adequately improve the bleach performance, whereas an addition of 8% (NI:anionic ratio 0.9) enhances the catalytic bleach performance and gives a better result than the control experiment without active.
- This Example shows the effect of increasing amounts of C₁₂-soap on the catalytic bleach performance of a catalyst/PBM bleach system on tea-stained test cloths. The experiments were carried out under the same conditions as used in Example I. The results are given in Table 4.
Table C₁₂-soap(% by weight) 0 9 21 33 74 mmol/1 0 2.4 5.8 9.0 20 Δ R₄₆₀* 25.0 28.6 25.1 23.4 20.2 - This Example shows the effect of Na₂CO₃ on the bleach performance of a detergent bleach composition of the following nominal formulation:
Formulation % by Weight Alkyl benzene sulphonate (ABS) 3.0 C₁₈-soap 1.7 Nonionic (Synperonic A3/A7) 9.8 Zeolite 24.0 Polymer (Sokalan CP5 ex BASF) 4.0 Sodium carboxymethylcellulose 0.6 Sodium perborate monohydrate 14.3 Mn-complex (I) catalyst 0.03 - The washing experiments were carried out at 40°C isothermal, using tap water of 16°FH at pH 10 and pH 10.5. Tea-stained test cloths were immersed in the wash solution, containing the bleach composition dosed at 6g/1, for 30 minutes
- The results expressed as reflectance difference Δ R₄₆₀* are shown in the following Tables.
Table 5 (at pH 10) Na₂CO₃ added (% by weight) - 2.5 5.0 10.0 20.0 Δ R₄₆₀* 25.6 21.6 21.7 16.8 15.7
The slightly negative effect of sodium carbonate at levels up to 5.0% and the significance decrease of catalytic bleach performance by the addition of higher levels, i.e. 10% and 20%, of sodium carbonate are clearly shown.Table 6 (at pH 10.5) Na₂CO₃ added (% by weight) - 10.0 20.0 Δ R₄₆₀* (-EDTA) 24.9 22.0 18.1 Δ R₄₆₀* (+ 0.3% EDTA) 28.0 26.1 - - The positive effect of increasing pH and adding EDTA are shown by the results in Table 6.
- Example I was repeated except the bleach catalyst used was MnIII MnIV (µ-O)₂(µ-OAc)(Et-bridged(Me₂TACN)₂)# and millipore water (ie. demineralised water which was further purified by treatment through a Milli-Q plus water purification system ex Millipore Corporation).
(# - prepared according to a method described by Prof Wieghardt at the 1991 ICBIC Conference in Oxford (UK)) - The level of catalyst corresponds to 0.037% by weight and of PBM to 14.3% by weight if a detergent bleach formulation is dosed at 6g/1.
-
- The results show a bridged material related to Mn₂(IV)(µ-0)₃(Me₃TACN)₂ catalyses perborate bleaching. The bleach catalysis is significantly reduced by the use of ABS but not if nonionic is used. However, if ABS as well as nonionic are present, a larger amount of nonionic is required to compensate for the poor effect of ABS than in the case when a non-bridged complex is used as bleach catalyst.
all optionally substituted on amine N-atom and/or CH₂ carbon atom and/or aromatic ring.
Claims (12)
- A detergent bleach composition comprising a surface active material, a peroxide bleaching agent and a dinuclear manganese complex, as the bleach catalyst, having the formula:
- A composition according to claim 1, characterised in that it comprises from 0-15% by weight of anionic surfactant and from 10-40% by weight of nonionic surfactant.
- A composition according to claim 1 or 2, characterised in that the detergent active system is free from C₁₆-C₂₂ fatty acid soaps.
- A composition according to claim 1, 2 or 3, characterised in that the surface active agent is a nonionic surface active agent.
- A composition according to any of the above claims 1-4, characterised in that the bleaching agent is a hydroperoxide compound.
- A composition according to claim 5, characterised in that it has a pH of up to 10 and contains not more than 5% by weight of a carbonate, expressed as sodium carbonate.
- A composition according to claim 6, characterised in that it is substantially free of carbonate.
- A composition according to any one of the claims 1 to 4 characterised in that the bleaching agent is a peroxyacid compound.
- A composition according to claim 1 wherein the bleach catalyst comprises two ligands of formula
s is an integer from 3 to 4;
u is zero or one;
R¹ and R² are each independently selected from H, alkyl, aryl, both optionally substituted; and
R³ is independently selected from hydrogen, alkyl, aryl, both optionally substituted, with the proviso that a bridging unit R⁴ is formed by one R³ unit from each ligand where R⁴ is the group CnR⁵R⁶-(D)p-CmR⁵R⁶ where p is zero or one;
D is selected from a heteroatom such as oxygen and NH⁷ or is part of an aromatic or saturated homonuclear or heteronuclear ring,
n is an integer from 1 to 4;
m is an integer from 1 to 4;
with the proviso that n + m <= 4 if p is zero or p is one and D is part of an aromatic or saturated homonuclear or heteronuclear ring; and that n + m <=3 if p is one and D is a heteroatom such as oxygen or NR⁷;
R⁵ and R⁶ are each independently selected from H, NR⁸ and OR⁹, alkyl, aryl, optionally substituted and R⁷,
R⁸, R⁹ are each independently selected from H, alkyl, aryl, both optionally substituted. - A composition according to claims 1-8, characterised in that the bleach catalyst is selected from the complexes:
(I) [MnIV₂(µ-O)₃(Me₃TACN)₂] (PF₆)₂
(II) [MnIV₂(µ-O)₃(Me₄TACN)₂] (PF₆)₂
(III) [MnIII₂(µ-O) (µ-OAc)₂(Me₃TACN)₂] (PF₆)₂
(IV) [MnIII₂(µ-O) (µ-OAc)₂(Me₄TACN)₂] (PF₆)₂
(V) [(Et-bridged(Me₂TACN)₂)MnIIIMnIV(µ-O)₂(µ-OAc)]²⁺ (ClO₄⁻)₂
- A composition according to claim 11, characterised in that said bleach catalyst is complex (I).
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EP91203078 | 1991-11-26 | ||
EP91203078 | 1991-11-26 |
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EP92310719A Withdrawn EP0544490A1 (en) | 1991-11-26 | 1992-11-24 | Detergent bleach compositions |
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EP (1) | EP0544490A1 (en) |
JP (1) | JPH0768543B2 (en) |
KR (1) | KR960000205B1 (en) |
CN (1) | CN1031647C (en) |
AU (1) | AU661522B2 (en) |
BR (1) | BR9204549A (en) |
CA (1) | CA2083661A1 (en) |
MX (1) | MX9206779A (en) |
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Also Published As
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TW234144B (en) | 1994-11-11 |
AU661522B2 (en) | 1995-07-27 |
CN1031647C (en) | 1996-04-24 |
ZA928188B (en) | 1994-05-26 |
KR930010171A (en) | 1993-06-22 |
MX9206779A (en) | 1993-05-01 |
CA2083661A1 (en) | 1993-05-27 |
BR9204549A (en) | 1993-06-01 |
TR27075A (en) | 1994-10-18 |
CN1073714A (en) | 1993-06-30 |
AU2962092A (en) | 1993-06-17 |
JPH0768543B2 (en) | 1995-07-26 |
JPH0641586A (en) | 1994-02-15 |
KR960000205B1 (en) | 1996-01-03 |
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