CA1226226A - Extrudable dental cream - Google Patents
Extrudable dental creamInfo
- Publication number
- CA1226226A CA1226226A CA000436560A CA436560A CA1226226A CA 1226226 A CA1226226 A CA 1226226A CA 000436560 A CA000436560 A CA 000436560A CA 436560 A CA436560 A CA 436560A CA 1226226 A CA1226226 A CA 1226226A
- Authority
- CA
- Canada
- Prior art keywords
- dental cream
- weight
- dental
- fluorine
- cream
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/04—Dispersions; Emulsions
- A61K8/042—Gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/26—Aluminium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
- A61K8/731—Cellulose; Quaternized cellulose derivatives
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
Abstract
ABSTRACT
A dental cream of desirable theological properties contains a hydrated alumina polishing material and a high viscosity hydroxyethyl cellulose gelling agent.
A dental cream of desirable theological properties contains a hydrated alumina polishing material and a high viscosity hydroxyethyl cellulose gelling agent.
Description
This invention relates to dental creams having desirable theological properties.
Sodium carboxymethyl cellulose has commonly been used as the gelding agent of commercial choice in dental cream in view of its availability and the generally satisfactory theological properties it gives to rental creams. However, it does tend to cause dental creams to increasingly thicken with the passage of time.
Hydroxyethyl cellulose has been suggested as an alternative golfing agent to sodium carboxymethyl cellulose and indeed grades of hydroxyethyl cellulose such as Notoriously* M have been used in commercial dental creams and grades have been set forth, for instance in United States Patents, 3,862,307 notoriously* G), and 3,070,510 (viscosity of 75-125 cps-Brookfield; 20C; 2% in water) and 4,022,881 (Notoriously 250 H). Such grades of hydroxyethyl cellulose, while generally satisfactory may tend to cause dental creams to undergo extensional rheology by forming a visible "tail" during container filling and upon extrusion onto a toothbrush. For instance, "stringiness" was described in United States Patent 4,022,881 in toothpastes containing a thickening agent mixture of 30% hydroxyethyl cellulose and 70~ sodium carboxymethyl cellulose. A non-stringy toothpaste containing calcium carbonate abrasive with a thickening agent mixture of 10% hydroxyethyl cellulose and 90% sodium carboxymethyl cellulose was also set forth.
* Trade Mark ~ZZ6Z26 In cop ending commonly assigned Canadian application Serial No. 436,575 by Anthony John Morton and Kenneth Harvey, dental cream is described in which there is little susceptibility to roughness upon aging together with other desirable theological properties such as good "stand up", absence of formation of a "tail" on an extruded ribbon of dental cream and good ribbon gloss. That dental cream contains a golfing agent mixture of sodium carboxymethyl cellulose and hydroxyethyl cellulose, each being present in a weight ratio of about 3:2 to 2:3.
In accordance with the present invention a golfing agent is employed which has desirable theological properties such as absence of formation of a "tail" on an extruded ribbon of dental cream, other excellent extrudibility properties and good ribbon gloss, particularly when filled in or extruded from a dental cream tube or pressure differential (e.g. aerosol or vacuum) or mechanically operated dispensing container.
With further regard to prior art US. Patent 4,022,881, a toothpaste was described containing as the thickening agent 5 - 30% of high viscosity hydroxyethyl cellulose (i.e. Notoriously 250 H) and 70 - 95% sodium carboxymethyl cellulose to avoid forming a toothpaste with a "stringy" texture, which would occur if the hydroxyethyl cellulose were used in above 30% of the thickening agent. Various polishing agents including "types of alumina" are mentioned as "typical toothpaste abrasives". However, except for calcium carbonate, none are actually set forth in toothpaste. In view of the disclosure of this patent it would not be expected that dental creams contain-in hydrated alumina polishing agent and high viscosity hydroxy-ethyl cellulose would not be "stringy" or tend to "tail".
6ZZ~
It is an advantage of this invention that a gellingagent is provided for a dental cream which has desirable theological properties.
It is a particular advantage of the invention that dental cream tailing is avoided and remoter is improved even when hydroxyethyl cellulose is the only golfing agent, particularly when the dental cream is filled into and extruded from a pressure differential or mechanically operated container or a dental cream tube.
Other advantages will be apparent from consideration of the following specification.
In accordance with certain of its aspects, this invention relates to a dental cream comprising about 20~75% of a polishing material, at least about half of which is hydrated alumina and a dental vehicle comprising at least about 20% by weight based on the weight of the dental cream of a liquid phase containing water, humectant or mixture thereof and about 0.5-5%
by weight based on the weight of -the dental cream of a golfing agent consisting essentially of hydroxyethyl cellulose having a viscosity in a range the average of which is at least about 24000 cups, determined on a Brook field viscometer at 20C, in a water glycerine (1:1.56) solution with a No. 6 spindle at 20 rum.
The golfing agent is present in the dental cream in amount of about 0.5-5% by weight, preferably about 0.8-2%, and most preferably about 0.9-1.4%. A grade of hydroxyethyl cellulose effective in the practice of the present invention is Tulsa* H 10000P, available from Farbwerke Hoechst of Frankfurt am Main, Germany.
*Trade Mark ~ZZ6Z26 Tulsa 10000 P and other grades of hydroxyethyl cellulose in accordance with the present invention have vise cosities in a range the average of which is at least about 24000 cups. In the present specification viscosity values are determined on a Brook field viscometer at 20C, in a water:glycer-ire (1:1.56) solution with a No. 6 spindle at 20 rum.
Hydroxyethyl cellulose grades which may be used in the present invention are set forth in the following table:
TABLE
HE
SUPPLIER GRADE VISCOSITY
-Hercules Notoriously* 250 HO 17000-31000 and ~50 H
Notoriously* 250 HER 37000-41000 arid 250 HUH
Hoechst Tulsa* H 10000 P 20000-30000 Hydroxyethyl cellulose grades of viscosity not reach-in an average of about 24000 cups, such as Hercules 250 M and MY (average viscosity of 15500 cups) and Hoechst Tylose*H4000P
(viscosity of up to 23000 cups), do not provide the desired rheology when used as the only golfing agent.
In the dental cream formulation the dental vehicle comprises a liquid phase proportioned with the golfing agents to form an extrudible creamy mass of desirable consistency. In general, liquids in the dental cream will comprise chiefly water, glycerin, sorbitol, polyethylene glycol 400, propylene glycol, or the like including suitable mixtures thereof. It is advantageous usually to use a mixture of both water and a humectant or binder such as glycerine or sorbitol; typically about 10-30% by weight of water and about 15-50% by weight of humectant. It is preferred to use glycerine or sorbitol. The total liquid content will generally be about 20-80% by weight of the formulation.
* Trade Mark 4 ~2Z6Z~6 The dental cream contains about 20-75% by weight of a polishing agent at least about half of which is hydrated alumina. If desired, up to about half of the total polishing agent may be additional dentally acceptable polishing material such as silica, dicalcium phosphate, calcined alumina, zirconium silicate, insoluble sodium metaphosphate etc.
Preferably about ~0-5B% of polishing material, typically all hydrated alumina, is present.
The hydrated alumina employed in accordance with the instant invention is preferably small in particle size, i.e., at least about 85 of the particles are smallest than 20 microns, such as that classified as gibbsite alpha alumina trihydrate) and normally represented chemically as AYE or Allah.
The alpha alumina trihydrate may have a size in the range of about 2.6-10 microns. The alpha alumina trihydrate sold by Alcoa as C333*
is a fine grade of gibbsite and is particularly highly desirable. The average particle size of C333* alumina is about 7-9 microns kilter-Counter). It is obtained by fine grinding of the grade of alumina trihydrate sold by Alcoa as C33. Other grades of hydrated alumina which may be employed include A 260* and A 230* sold by British Aluminum Company and SO 100* sold by Rhone-Poulenc.
The dental cream is typically packaged in a container form from which it can be readily extruded such as a pressure differential or mechanically operated dental cream dispenser or a lined or unlined aluminum tube or lead tube or laminated tube. The theological properties are particularly desirable when a mechanically operated dispensing container of the type described in British Patent Application AYE, published September 9, 1981, is employed. This dispensing container comprises a dispensing mouthpiece, a tension member, a piston and operating hand control. Pressure differential dispensing container may be of the aerosol or vacuum type.
* Trade Mark ~Z~:6ZZ~
The dental cream may contain a compound which provides at least about 100 Pam, of fluoride, typically about 100-10000 Pam, typically about 750-2000 Pam. Compounds which provide fluorine include sodium fluoride, stuns fluoride, potassium fluoride, potassium stuns fluoride, sodium hex-fluorostannate, stuns chlorofluoride, sodium monofluorophos-plate and amine fluorides including mixtures thereof. Most typically in accordance with the present invention sodium monofluorophosphate or a mixture of sodium monofluorophosphate and sodium fluoride may be employed.
The dental cream may preferably contain sodium monofluorophosphate or a mixture of sodium monofluorophosphate and sodium fluoride in amount to provide about 100-10000 Pam of fluorine, e.g. about 750-2000 Pam, of particularly about 1400-2000 Pam such as about 1400-1670 Pam. A binary fluoride system of sodium monofluorophosphate and sodium fluoride is desirably used in which about 30-40% of the fluorine (e.g. about 30-35%) is provided by sodium fluoride.
Sodium monofluorophosphate, Na2PO3F, as commercially available, may vary considerably in purity. It may be used in any suitable purity provided that any impurities do not sub-staunchly adversely affect the desired properties. In general, the purity is desirably at least 80%. For best results, it should be at least 85%, and preferably at least 90% by weight of sodium monofluorophosphate with the balance being primarily impurities or by-products of manufacture such as sodium fluoride ~z~zz~
and water-soluble sodium phosphate salt. Expressed in another way, the sodium monofluorophosphate employed should have a total fluoride content of above 12%, preferably above 12.7%, a content of not more than 1.5%, preferably not more than 1.2% of free sodium fluoride; and a sodium monofluorophosphate content of at least 12%; preferably at least 12.1% all calculated as fluoride.
As indicated above, sodium fluoride in the binary mixture is a separate fluorine-containing component from sodium monofluorophosphate. About 225-800 Pam of fluorine is preferably provided to the dental cream by sodium fluoride.
Any suitable surface active or detersive material may be included in the dentifrice compositions. Such compatible materials are desirable to provide additional detersive, foam-in and anti-bacterial properties depending upon the specific type of surface active material and are selected similarly.
These detergents are water-soluble compounds usually, and may be anionic, non ionic, or cat ionic in structure. It is usually preferred to use the water-soluble non-soap or synthetic organic detergents. Suitable detersive materials are known and include, for example, the water-soluble salts of higher fatty acid monoglyceride monosulphate detergent (e.g., sodium coconut fatty acid monoglycerlde monosulphate), higher alkyd sulfite (e.g. sodium laurel sulfite), alkyd aureole sulphonate (e.g.
sodium dodecyl Bunsen sulphonate, higher fatty acid esters of 1,2-dihydroxy propane sulphonate) and the like.
Further surface active agents include the substanti-ally saturated higher aliphatic azalea asides of lower aliphatic amino carboxylic acid compounds, such as those having 12 to 16 carbons in the azalea radical. The amino acid portion is derived generally from the lower aliphatic saturated monoaminocarboxylic acids having about 2 to 6 carbons, usually the monocarboxylic acid compounds. Suitable compounds are the fatty acid asides of ~ZZ6ZZ~
Gleason, sarcosine, ala nine, 3-aminopropanoic acid and valise having about 12 to 16 carbons in the azalea group. It is preferred to use the N-lauroyl, myristoyl and palmitoyl sarcoside come pounds, however, for optimum effects.
The aside compounds may be employed in the form of the free acid or preferably as the water-soluble salts thereof, such as the alkali metal, ammonium, amine and alkylolamine salts.
Specific examples thereof are the sodium and potassium N-lauroyl, myristoyl and palmitoyl sarcosides, ammonium and ethanol amine N-lauroyl glossed and ala nine. For convenience herein, refer-once to "amino carboxylic acid compound", "sarcoside", and the like refers to such compounds have a free carboxylic group or the water-soluble carboxylic salts.
Such materials are utilized in pure or substantially pure form. They should be as free as practicable from soap or similar higher fatty acid material which tends to reduce the activity of these compounds. In usual practice, the amount of such higher fatty acid material is less than 15% by weight of the aside and insufficient to substantially adversely affect it and preferably less than about 10% of said aside material.
Various other materials may be incorporated in the dental creams of this invention. Examples thereof are coloring or whitening agents, preservatives, such as methyl p-hydroxy-bonniest, astringent materials such as Allentown, zinc sulfite, and aluminum sulfite, stabilizers, pyridyl carbinol, twitter-sodium pyrophosphate, silicones, chlorophyll compounds and amounted materials such as urea, diammonium phosphate and mixtures thereof. These adjutants are incorporated in the instant compositions in amount which do not substantially adversely affect the desired properties and characteristics and are suitably selected and used in conventional amounts. Among the above mentioned materials, zinc sulfite and aluminum .
I
sulfite are effective to further reduce extensional rheology when present in amount of about 0.05- 1.5% by weight.
pa ~22~Z26 For some purposes it may be desirable to include antibacterial agents in the compositions of the present invent lion. Typical antibacterial agents which may be used in amounts of about 0.01% to about 5%, preferably about 0.05% to about 1.0%, by weight of the dentifrice composition include:
Nl-4(chlorobenzyl) -No - (2,4-dichlorobenzyl) biguanide;
p-chlorophenyl biguanide;
4-chloxobenz hydryl biguanide;
4-chlorobenz hydrylguanylurea;
N-3-lauroxypropyl-N5-p-chlorobenzylbiguanide;
1,6-di-p-chlorophenylbiguanidehexane;
l-(lauryldimethylammonium)-8-(p-chlorobenzyldimethHal-ammonium) octane dichlorides 5,6-dichloro-2-guanidinobenzimidazole;
Nl-p-chlorophenyl-N5-laurylbiguanide;
5-amino-1,3-bis ~2-ethylhexyl)-5-me-thylhexahydropyrimi-dine;
and their non-toxic acid addition salts.
Any suitable flavoring or sweetening materials may be employed in formulating a flavor for the compositions of the present invention. Examples of suitable flavoring constitu-ens include the flavoring oils, e.g., oils of spearmint, pep-permit, winter green, sassafras, clove, sage, eucalyptus, marjoram, cinnamon, lemon and orange, as well as methylsalicy-late. Suitable sweetening agents include sucrose, lactose, maltose sorbitol, sodium cyclamate, sodium saccharine dipeptides of US. Patent No. 3,939,261 and oxathiazin salts of US. Patent No. 3,932,606. Suitable flavor and sweetening agent may together comprise from about 0.01 -to 5% or more of the compost-lion.
The dental creams should have a pi practicable for use. A pi range of 3 to 10.5 is particularly desirable. The , I.
~L2~6Z2~i reference to the pi is meant to be the pi determination directly on the dental cream. If desired, materials such as benzoic, phosphoric or citric acid may be added to adjust the pi to, say 4 to 7.5.
pa lZi~6Z2~
The following example is further illustrative of the nature of the present invention, but it is to be understood that the invention is not limited thereto. The compositions are prepared in the usual manner and all amounts of the various ingredients are by weight unless otherwise specified.
EXAMPLE
The following dental creams are prepared by convent tonal dental cream formulation technique. Dental creams A and B are filled into the mechanical dispenser described in published British Patent Application AYE. Dental cream C is filled into an unlined aluminum dental cream tube and dental cream D
is filled into a lined aluminum dental cream tube.
PARTS
A B C D
Sorbitol (70% solution) 23,000 23,000 _ 23,000 Glycerine 20.20 Hydroxyethyl cellulose (Hercules Natrosol*250M) 1.00 Hydroxyethyl cellulose (Hoechst Tylose*HlOOOOP) 1.00 1.30 1.00 Alpha alumina trihydrate (Alcoa C333)* 52.000 52.000 52.000 52.000 C12-C18 Alcohol No sulfite (100% AIR 0.5 0.5 1.5 1.5 Zinc sulfite .7H20 0.48 Aluminum sulphate.l8H20 0.78 Sodium saccharin 0.170.17 0.20 0.17 Methyl p-hydroxybenzoate 0.08 0.08 0.08 Sodium monofluorophosphate 0.760.76 Sodium fluoride 0.100.10 , * Trade Mark 10 I Zoo PARTS
_ B C D
Pyridyl carbinol 0.10 0.10 - -Allentown 0.15 0.15 0.15 Flavor 1.20 1.20 1.00 1.20 Phosphoric acid (85%) 0.1~ 0.1~ - -Deionized water us us us us to 100 to 100 to 100 to 100 During filling and upon extrusion the surface of the dental creams ARC and D are smooth and theologically desirable while dental cream B undergoes extensional rheology during filling and upon extrusion from its container. Similar theological effects to those exhibited by dental creams A, C and D occur when Tulsa* H10000 of dental creams A, C
and D is replaced by Notoriously* 250 H and Notoriously* 250 HUH. Tailing occurs when dental cream B (with Notoriously* 250M) is filled into a dental cream tube.
Although the invention has been described with regard to a specific example and certain variations thereof, it will be apparent to one skilled in the art that various modifications may be made thereto which fall within its scope.
* Trade Mark
Sodium carboxymethyl cellulose has commonly been used as the gelding agent of commercial choice in dental cream in view of its availability and the generally satisfactory theological properties it gives to rental creams. However, it does tend to cause dental creams to increasingly thicken with the passage of time.
Hydroxyethyl cellulose has been suggested as an alternative golfing agent to sodium carboxymethyl cellulose and indeed grades of hydroxyethyl cellulose such as Notoriously* M have been used in commercial dental creams and grades have been set forth, for instance in United States Patents, 3,862,307 notoriously* G), and 3,070,510 (viscosity of 75-125 cps-Brookfield; 20C; 2% in water) and 4,022,881 (Notoriously 250 H). Such grades of hydroxyethyl cellulose, while generally satisfactory may tend to cause dental creams to undergo extensional rheology by forming a visible "tail" during container filling and upon extrusion onto a toothbrush. For instance, "stringiness" was described in United States Patent 4,022,881 in toothpastes containing a thickening agent mixture of 30% hydroxyethyl cellulose and 70~ sodium carboxymethyl cellulose. A non-stringy toothpaste containing calcium carbonate abrasive with a thickening agent mixture of 10% hydroxyethyl cellulose and 90% sodium carboxymethyl cellulose was also set forth.
* Trade Mark ~ZZ6Z26 In cop ending commonly assigned Canadian application Serial No. 436,575 by Anthony John Morton and Kenneth Harvey, dental cream is described in which there is little susceptibility to roughness upon aging together with other desirable theological properties such as good "stand up", absence of formation of a "tail" on an extruded ribbon of dental cream and good ribbon gloss. That dental cream contains a golfing agent mixture of sodium carboxymethyl cellulose and hydroxyethyl cellulose, each being present in a weight ratio of about 3:2 to 2:3.
In accordance with the present invention a golfing agent is employed which has desirable theological properties such as absence of formation of a "tail" on an extruded ribbon of dental cream, other excellent extrudibility properties and good ribbon gloss, particularly when filled in or extruded from a dental cream tube or pressure differential (e.g. aerosol or vacuum) or mechanically operated dispensing container.
With further regard to prior art US. Patent 4,022,881, a toothpaste was described containing as the thickening agent 5 - 30% of high viscosity hydroxyethyl cellulose (i.e. Notoriously 250 H) and 70 - 95% sodium carboxymethyl cellulose to avoid forming a toothpaste with a "stringy" texture, which would occur if the hydroxyethyl cellulose were used in above 30% of the thickening agent. Various polishing agents including "types of alumina" are mentioned as "typical toothpaste abrasives". However, except for calcium carbonate, none are actually set forth in toothpaste. In view of the disclosure of this patent it would not be expected that dental creams contain-in hydrated alumina polishing agent and high viscosity hydroxy-ethyl cellulose would not be "stringy" or tend to "tail".
6ZZ~
It is an advantage of this invention that a gellingagent is provided for a dental cream which has desirable theological properties.
It is a particular advantage of the invention that dental cream tailing is avoided and remoter is improved even when hydroxyethyl cellulose is the only golfing agent, particularly when the dental cream is filled into and extruded from a pressure differential or mechanically operated container or a dental cream tube.
Other advantages will be apparent from consideration of the following specification.
In accordance with certain of its aspects, this invention relates to a dental cream comprising about 20~75% of a polishing material, at least about half of which is hydrated alumina and a dental vehicle comprising at least about 20% by weight based on the weight of the dental cream of a liquid phase containing water, humectant or mixture thereof and about 0.5-5%
by weight based on the weight of -the dental cream of a golfing agent consisting essentially of hydroxyethyl cellulose having a viscosity in a range the average of which is at least about 24000 cups, determined on a Brook field viscometer at 20C, in a water glycerine (1:1.56) solution with a No. 6 spindle at 20 rum.
The golfing agent is present in the dental cream in amount of about 0.5-5% by weight, preferably about 0.8-2%, and most preferably about 0.9-1.4%. A grade of hydroxyethyl cellulose effective in the practice of the present invention is Tulsa* H 10000P, available from Farbwerke Hoechst of Frankfurt am Main, Germany.
*Trade Mark ~ZZ6Z26 Tulsa 10000 P and other grades of hydroxyethyl cellulose in accordance with the present invention have vise cosities in a range the average of which is at least about 24000 cups. In the present specification viscosity values are determined on a Brook field viscometer at 20C, in a water:glycer-ire (1:1.56) solution with a No. 6 spindle at 20 rum.
Hydroxyethyl cellulose grades which may be used in the present invention are set forth in the following table:
TABLE
HE
SUPPLIER GRADE VISCOSITY
-Hercules Notoriously* 250 HO 17000-31000 and ~50 H
Notoriously* 250 HER 37000-41000 arid 250 HUH
Hoechst Tulsa* H 10000 P 20000-30000 Hydroxyethyl cellulose grades of viscosity not reach-in an average of about 24000 cups, such as Hercules 250 M and MY (average viscosity of 15500 cups) and Hoechst Tylose*H4000P
(viscosity of up to 23000 cups), do not provide the desired rheology when used as the only golfing agent.
In the dental cream formulation the dental vehicle comprises a liquid phase proportioned with the golfing agents to form an extrudible creamy mass of desirable consistency. In general, liquids in the dental cream will comprise chiefly water, glycerin, sorbitol, polyethylene glycol 400, propylene glycol, or the like including suitable mixtures thereof. It is advantageous usually to use a mixture of both water and a humectant or binder such as glycerine or sorbitol; typically about 10-30% by weight of water and about 15-50% by weight of humectant. It is preferred to use glycerine or sorbitol. The total liquid content will generally be about 20-80% by weight of the formulation.
* Trade Mark 4 ~2Z6Z~6 The dental cream contains about 20-75% by weight of a polishing agent at least about half of which is hydrated alumina. If desired, up to about half of the total polishing agent may be additional dentally acceptable polishing material such as silica, dicalcium phosphate, calcined alumina, zirconium silicate, insoluble sodium metaphosphate etc.
Preferably about ~0-5B% of polishing material, typically all hydrated alumina, is present.
The hydrated alumina employed in accordance with the instant invention is preferably small in particle size, i.e., at least about 85 of the particles are smallest than 20 microns, such as that classified as gibbsite alpha alumina trihydrate) and normally represented chemically as AYE or Allah.
The alpha alumina trihydrate may have a size in the range of about 2.6-10 microns. The alpha alumina trihydrate sold by Alcoa as C333*
is a fine grade of gibbsite and is particularly highly desirable. The average particle size of C333* alumina is about 7-9 microns kilter-Counter). It is obtained by fine grinding of the grade of alumina trihydrate sold by Alcoa as C33. Other grades of hydrated alumina which may be employed include A 260* and A 230* sold by British Aluminum Company and SO 100* sold by Rhone-Poulenc.
The dental cream is typically packaged in a container form from which it can be readily extruded such as a pressure differential or mechanically operated dental cream dispenser or a lined or unlined aluminum tube or lead tube or laminated tube. The theological properties are particularly desirable when a mechanically operated dispensing container of the type described in British Patent Application AYE, published September 9, 1981, is employed. This dispensing container comprises a dispensing mouthpiece, a tension member, a piston and operating hand control. Pressure differential dispensing container may be of the aerosol or vacuum type.
* Trade Mark ~Z~:6ZZ~
The dental cream may contain a compound which provides at least about 100 Pam, of fluoride, typically about 100-10000 Pam, typically about 750-2000 Pam. Compounds which provide fluorine include sodium fluoride, stuns fluoride, potassium fluoride, potassium stuns fluoride, sodium hex-fluorostannate, stuns chlorofluoride, sodium monofluorophos-plate and amine fluorides including mixtures thereof. Most typically in accordance with the present invention sodium monofluorophosphate or a mixture of sodium monofluorophosphate and sodium fluoride may be employed.
The dental cream may preferably contain sodium monofluorophosphate or a mixture of sodium monofluorophosphate and sodium fluoride in amount to provide about 100-10000 Pam of fluorine, e.g. about 750-2000 Pam, of particularly about 1400-2000 Pam such as about 1400-1670 Pam. A binary fluoride system of sodium monofluorophosphate and sodium fluoride is desirably used in which about 30-40% of the fluorine (e.g. about 30-35%) is provided by sodium fluoride.
Sodium monofluorophosphate, Na2PO3F, as commercially available, may vary considerably in purity. It may be used in any suitable purity provided that any impurities do not sub-staunchly adversely affect the desired properties. In general, the purity is desirably at least 80%. For best results, it should be at least 85%, and preferably at least 90% by weight of sodium monofluorophosphate with the balance being primarily impurities or by-products of manufacture such as sodium fluoride ~z~zz~
and water-soluble sodium phosphate salt. Expressed in another way, the sodium monofluorophosphate employed should have a total fluoride content of above 12%, preferably above 12.7%, a content of not more than 1.5%, preferably not more than 1.2% of free sodium fluoride; and a sodium monofluorophosphate content of at least 12%; preferably at least 12.1% all calculated as fluoride.
As indicated above, sodium fluoride in the binary mixture is a separate fluorine-containing component from sodium monofluorophosphate. About 225-800 Pam of fluorine is preferably provided to the dental cream by sodium fluoride.
Any suitable surface active or detersive material may be included in the dentifrice compositions. Such compatible materials are desirable to provide additional detersive, foam-in and anti-bacterial properties depending upon the specific type of surface active material and are selected similarly.
These detergents are water-soluble compounds usually, and may be anionic, non ionic, or cat ionic in structure. It is usually preferred to use the water-soluble non-soap or synthetic organic detergents. Suitable detersive materials are known and include, for example, the water-soluble salts of higher fatty acid monoglyceride monosulphate detergent (e.g., sodium coconut fatty acid monoglycerlde monosulphate), higher alkyd sulfite (e.g. sodium laurel sulfite), alkyd aureole sulphonate (e.g.
sodium dodecyl Bunsen sulphonate, higher fatty acid esters of 1,2-dihydroxy propane sulphonate) and the like.
Further surface active agents include the substanti-ally saturated higher aliphatic azalea asides of lower aliphatic amino carboxylic acid compounds, such as those having 12 to 16 carbons in the azalea radical. The amino acid portion is derived generally from the lower aliphatic saturated monoaminocarboxylic acids having about 2 to 6 carbons, usually the monocarboxylic acid compounds. Suitable compounds are the fatty acid asides of ~ZZ6ZZ~
Gleason, sarcosine, ala nine, 3-aminopropanoic acid and valise having about 12 to 16 carbons in the azalea group. It is preferred to use the N-lauroyl, myristoyl and palmitoyl sarcoside come pounds, however, for optimum effects.
The aside compounds may be employed in the form of the free acid or preferably as the water-soluble salts thereof, such as the alkali metal, ammonium, amine and alkylolamine salts.
Specific examples thereof are the sodium and potassium N-lauroyl, myristoyl and palmitoyl sarcosides, ammonium and ethanol amine N-lauroyl glossed and ala nine. For convenience herein, refer-once to "amino carboxylic acid compound", "sarcoside", and the like refers to such compounds have a free carboxylic group or the water-soluble carboxylic salts.
Such materials are utilized in pure or substantially pure form. They should be as free as practicable from soap or similar higher fatty acid material which tends to reduce the activity of these compounds. In usual practice, the amount of such higher fatty acid material is less than 15% by weight of the aside and insufficient to substantially adversely affect it and preferably less than about 10% of said aside material.
Various other materials may be incorporated in the dental creams of this invention. Examples thereof are coloring or whitening agents, preservatives, such as methyl p-hydroxy-bonniest, astringent materials such as Allentown, zinc sulfite, and aluminum sulfite, stabilizers, pyridyl carbinol, twitter-sodium pyrophosphate, silicones, chlorophyll compounds and amounted materials such as urea, diammonium phosphate and mixtures thereof. These adjutants are incorporated in the instant compositions in amount which do not substantially adversely affect the desired properties and characteristics and are suitably selected and used in conventional amounts. Among the above mentioned materials, zinc sulfite and aluminum .
I
sulfite are effective to further reduce extensional rheology when present in amount of about 0.05- 1.5% by weight.
pa ~22~Z26 For some purposes it may be desirable to include antibacterial agents in the compositions of the present invent lion. Typical antibacterial agents which may be used in amounts of about 0.01% to about 5%, preferably about 0.05% to about 1.0%, by weight of the dentifrice composition include:
Nl-4(chlorobenzyl) -No - (2,4-dichlorobenzyl) biguanide;
p-chlorophenyl biguanide;
4-chloxobenz hydryl biguanide;
4-chlorobenz hydrylguanylurea;
N-3-lauroxypropyl-N5-p-chlorobenzylbiguanide;
1,6-di-p-chlorophenylbiguanidehexane;
l-(lauryldimethylammonium)-8-(p-chlorobenzyldimethHal-ammonium) octane dichlorides 5,6-dichloro-2-guanidinobenzimidazole;
Nl-p-chlorophenyl-N5-laurylbiguanide;
5-amino-1,3-bis ~2-ethylhexyl)-5-me-thylhexahydropyrimi-dine;
and their non-toxic acid addition salts.
Any suitable flavoring or sweetening materials may be employed in formulating a flavor for the compositions of the present invention. Examples of suitable flavoring constitu-ens include the flavoring oils, e.g., oils of spearmint, pep-permit, winter green, sassafras, clove, sage, eucalyptus, marjoram, cinnamon, lemon and orange, as well as methylsalicy-late. Suitable sweetening agents include sucrose, lactose, maltose sorbitol, sodium cyclamate, sodium saccharine dipeptides of US. Patent No. 3,939,261 and oxathiazin salts of US. Patent No. 3,932,606. Suitable flavor and sweetening agent may together comprise from about 0.01 -to 5% or more of the compost-lion.
The dental creams should have a pi practicable for use. A pi range of 3 to 10.5 is particularly desirable. The , I.
~L2~6Z2~i reference to the pi is meant to be the pi determination directly on the dental cream. If desired, materials such as benzoic, phosphoric or citric acid may be added to adjust the pi to, say 4 to 7.5.
pa lZi~6Z2~
The following example is further illustrative of the nature of the present invention, but it is to be understood that the invention is not limited thereto. The compositions are prepared in the usual manner and all amounts of the various ingredients are by weight unless otherwise specified.
EXAMPLE
The following dental creams are prepared by convent tonal dental cream formulation technique. Dental creams A and B are filled into the mechanical dispenser described in published British Patent Application AYE. Dental cream C is filled into an unlined aluminum dental cream tube and dental cream D
is filled into a lined aluminum dental cream tube.
PARTS
A B C D
Sorbitol (70% solution) 23,000 23,000 _ 23,000 Glycerine 20.20 Hydroxyethyl cellulose (Hercules Natrosol*250M) 1.00 Hydroxyethyl cellulose (Hoechst Tylose*HlOOOOP) 1.00 1.30 1.00 Alpha alumina trihydrate (Alcoa C333)* 52.000 52.000 52.000 52.000 C12-C18 Alcohol No sulfite (100% AIR 0.5 0.5 1.5 1.5 Zinc sulfite .7H20 0.48 Aluminum sulphate.l8H20 0.78 Sodium saccharin 0.170.17 0.20 0.17 Methyl p-hydroxybenzoate 0.08 0.08 0.08 Sodium monofluorophosphate 0.760.76 Sodium fluoride 0.100.10 , * Trade Mark 10 I Zoo PARTS
_ B C D
Pyridyl carbinol 0.10 0.10 - -Allentown 0.15 0.15 0.15 Flavor 1.20 1.20 1.00 1.20 Phosphoric acid (85%) 0.1~ 0.1~ - -Deionized water us us us us to 100 to 100 to 100 to 100 During filling and upon extrusion the surface of the dental creams ARC and D are smooth and theologically desirable while dental cream B undergoes extensional rheology during filling and upon extrusion from its container. Similar theological effects to those exhibited by dental creams A, C and D occur when Tulsa* H10000 of dental creams A, C
and D is replaced by Notoriously* 250 H and Notoriously* 250 HUH. Tailing occurs when dental cream B (with Notoriously* 250M) is filled into a dental cream tube.
Although the invention has been described with regard to a specific example and certain variations thereof, it will be apparent to one skilled in the art that various modifications may be made thereto which fall within its scope.
* Trade Mark
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A dental cream comprising about 20-75% by weight of a polishing material, at least about half of which is hydrated alumina and at least about 20% by weight based on the weight of the dental cream of a liquid phase containing water, humectant or mixture thereof and about 0.5-5% by weight based on the weight of the dental cream of a gelling agent consisting essentially of hydroxyethyl cellulose having a viscosity in a range the average of which is at least about 24000 cps, determined on a Brookfield viscometer in 2% by weight water:
glycerine (1:1.56) solution at 20°C, with a No. 6 spindle at 20 rpm.
glycerine (1:1.56) solution at 20°C, with a No. 6 spindle at 20 rpm.
2. The dental cream claimed in claim 1 wherein about 40-55% of alpha-alumina trihydrate polishing agent is present.
3. The dental cream claimed in claim 1 wherein said hydroxyethyl cellulose is a grade having a viscosity of about 17000-31000; about 37000-41000; or about 20000-30000.
4. The dental cream claimed in claim 3 wherein said hydroxyethyl cellulose has a viscosity of about 20000-30000.
5. The dental cream claimed in claim 1 whereas said dental cream is contained in a pressure differential dispensing container, a mechanically operated dispensing container or a dental cream tube.
6. The dental cream claimed in claim 5 wherein said dental cream is contained in a mechanically operated dispensing container from which it is extrudible.
7. The dental cream claimed in claim 5 wherein said dental cream is contained in a dental cream tube.
8. The dental cream claimed in claim 7 wherein said dental cream tube is an unlined aluminum tube.
9. The dental cream claimed in Claim 1 wherein fluorine-providing compound is present in amount which provides about 100-10000 ppm of fluorine.
10. The dental cream claimed in Claim 9 wherein said fluorine is provided by sodium monofluorophosphate in amount of about 750-2000 ppm.
11. The dental cream claimed in Claim 9 wherein said fluorine about 750-2000 ppm of fluorine is provided by a binary fluoride system of sodium monofluorophosphate and sodium fluoride in which about 30-40% by weight of the fluorine is provided by sodium fluoride.
12. The dental cream claimed in Claim 1 wherein zinc sulphate or aluminium sulphate is present in amount of about 0.05- 1.5% by weight.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/479,528 US4444747A (en) | 1983-03-28 | 1983-03-28 | Extrudable dental cream |
| US479,528 | 1983-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1226226A true CA1226226A (en) | 1987-09-01 |
Family
ID=23904393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436560A Expired CA1226226A (en) | 1983-03-28 | 1983-09-13 | Extrudable dental cream |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4444747A (en) |
| CA (1) | CA1226226A (en) |
| PH (1) | PH19820A (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529585A (en) * | 1983-12-23 | 1985-07-16 | Colgate-Palmolive Company | Dentrifrice preparation |
| US4529584A (en) * | 1983-12-23 | 1985-07-16 | Colgate-Palmolive Company | Dentifrice composition |
| US4565692A (en) * | 1983-12-23 | 1986-01-21 | Colgate-Palmolive Company | Extrudable dentifrice |
| US4627976A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4627975A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Dental floss dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4627978A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Tooth drop dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4610872A (en) * | 1984-12-21 | 1986-09-09 | Ici Americas Inc. | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4627974A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4632937A (en) * | 1984-12-21 | 1986-12-30 | Ici Americas | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4585649A (en) * | 1984-12-21 | 1986-04-29 | Ici Americas Inc. | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4627979A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Toothpaste dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US4627980A (en) * | 1984-12-21 | 1986-12-09 | Ici Americas Inc. | Hard candy dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce irritation and plaque accumulation |
| US4610871A (en) * | 1984-12-21 | 1986-09-09 | Ici Americas Inc. | Dentifrice formulation and method of treating teeth, mouth and throat therewith to reduce plaque accumulation and irritation |
| US6187293B1 (en) * | 1998-04-27 | 2001-02-13 | Fmc Corporation | Process for making toothpaste using low levels of carrageenan |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3070510A (en) * | 1959-11-03 | 1962-12-25 | Procter & Gamble | Dentifrice containing resinous cleaning agents |
| US3337412A (en) * | 1964-04-10 | 1967-08-22 | Charles H Elbreder | Topical fluoride-phosphate compositions and method |
| US3946108A (en) * | 1971-11-26 | 1976-03-23 | Colgate-Palmolive Company | Dentifrice |
| US3903252A (en) * | 1972-06-08 | 1975-09-02 | Lorvic Corp | Dental disclosing compositions and the method of making and using the same |
| US4020154A (en) * | 1973-01-22 | 1977-04-26 | Colgate-Palmolive Company | Manufacture of gas-free dentifrice |
| US4022881A (en) * | 1974-06-18 | 1977-05-10 | Beecham Group Limited | Dentifrice |
| US4132771A (en) * | 1977-08-24 | 1979-01-02 | Schreiber Ronald S | Warm two tone flavored dentifrice |
| US4251507A (en) * | 1979-10-02 | 1981-02-17 | Dominion Pharmacal, Inc. | Process and composition for reducing dental plaque |
| US4344931A (en) * | 1980-12-18 | 1982-08-17 | Abel Aguilar | Dry dentifrice powders |
-
1983
- 1983-03-28 US US06/479,528 patent/US4444747A/en not_active Expired - Fee Related
- 1983-09-13 CA CA000436560A patent/CA1226226A/en not_active Expired
-
1985
- 1985-02-08 PH PH31832A patent/PH19820A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US4444747A (en) | 1984-04-24 |
| PH19820A (en) | 1986-07-14 |
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