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1. CA2068431 - COMPOSITIONS STABILISEES A BASE DE FLUORURE STANNEUX POUR LES SOINS DE LA BOUCHE

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[ EN ]
*091/07163 PCr/~lS91~/~)6~
STABIL TZM STANNOUS FLUORIDE COMPOSITIONS FOR ORAL CARE
This invention relates to aqueous stannous fluoride compositions for oral care with increased stannous ion stability. In particular, this invention 5 is directed to compositions comprising stannous fluoride stabilized with a copolymer of maleic anhydride or acid and a lower alkyl vinyl ether. The compositions of the invention are particularly useful in the form of aqueous gel compositions, aqueous mouthwash compositions and lO aqueous toothpaste compositions.
Stannous fluoride has been used in oral care products since the early 1950's, and stannous fluoride has been reported to be an effective agent for treating various oral conditions and diseases including plaque, 15 gingivitis, sensitivity, enamel decalcification, and periodontitis, among others. Product stability is an outstanding problem because stannous f fluoride is unstable in water and forms stannous oxy-fluoride and stannic c_ _ ', both of which reduce or inhibit 20 enamel fluoridation that ig, formation of stannous fluororh~s~h~te and fluorapatite. This instability has required formulation of home treatment gels as anhydrous gels. Despite highly speriAl; ~e1 precautionary measures during formulation of oral care products, significant 25 variations are found in stannous ion concentrations of commercial dentifrice ge products along different manufacturers as well as among batches of the same brand of dentifrice because of stannous ion instability.
The original aqueous stannous fluoride formulations have been reformulated as stannous ion-free compositions because of the instability of the stannous ion in water. Numerous stannous fluoride formulations with "stabilizing agents" have been proposed.
U.S. Patent 3,445,567 claims that aqueous stannous fluoride compositions can be stabilized with sorbitol or a mixture of sorbitol and glycerine.
However, this composition lacks the shelf-life stability reguired for commercial use.
U.S. Patents 3,711,604, 3,919,409, 3,93S,306 and 3,980,767 disclose toothpaste and dentifrice formulations including soluble fluoride compounds, including stannous f fluoride . The toothpaste formulations use a variety of standard ingredients and gelling agents including carboxyvinyl polymers sold under the tradename Carbopol and insoluble abrasives such as silica and silicates. The stannous fluoride containing ' -'i- Ls di~clo~cd in these patents lack the stability found in the compositions of this invention .
U.S. Patent 4,418,057 describes another approach. Stannous fluoride is formulated as a nonaqueous gel mixture including anhydrous glycerin and thyl cellulose gelling agent. Total exclusion of moisture from the moisture is required to protect the stannous ion.
U.S. Patent 4,259,316, while noting the instability of stannous fluoride, proposes a compositions containing phytic acid for inhibiting dental caries. Both dry dentrifices and aqueous gel and mouthwash formulations are described. If protected from moisture, the dentrifices would appear to retain the stannous ion in efficacy;o~ form. The stannous ion would rapidly convert to the ineffective oxy-stannous or 0 91/07t63 Pc r/~is91~ fit stannate forms upon exposure to moisture in solution or in the oral cavity. Apparently, excess amounts of stannous fluoride are added in an effort to offset the loss of stannous ion. Elowever, this requires the exposure of the user to excessive, unsafe levels of stannous ion.
EP0 application 88308337 . 0 (Publication No. 0 311 260 A3) published April 12, 1989 describes compositions containing stannous fluoride, and as a stannous reservoir to replace stannous ion lost through degradation, stannous gluconate. Mouthwashes are described. Listed as suitable abrasive polishing agents are silicas, including gels and precipitates, insoluble sodium polymetaphosphate; B-phase calcium pyrophosphate; alumina and resinous abrasive materials which do not contribute soluble calcium ions which form complexes with the f fluoride ion . Calcium carbonate, calcium phosphate and regular calcium pyrophosphate are excluded .
U.S. Patent-4,254,101 describes compositions containing a humectant, silica abrasive, a carboxyvinyl polymer, water and fluoride ~ '- as optional ingredients. The only carboxyvinyl polymers disclosed are colloidally water-soluble polymers of acrylic acid crosslinked with polyallyl sucrose or polyallyl pentaerythritol. A variety of fluoride including sodium fluoride are described as suitable optional ingredients. stannous fluoride is included in the list of suitable fluoride ~ although no suggestion is made about its instability or that it could be used as an effective source of stannous ion. It i5 presented as equivalent to sodium fluoride as source of fluoride ion. Phosphor-s _u--taining anticalculus agents are also listed as optional ingredients.
U.S. Patent 4,515,772 describes oral compositions including dentrifices and aqueous compositions including toothpastes and mouthwashes containing certain pyrophosphate salts as anticalculus formulations. In the prior art description, it lists a number of chelating agents proposed as anticalculuS agents, including EDT (ethylen;diaminetetraacetic acid), 5 nitrilotriacetic acid, polyphosphonates and fluoride, and carbonyl diph~srhnrlAtes. The patent lists as suitable abrasives silca, calcium pyrophosphate, Bpha6e pyroph-~sphAte, alumina and other materials. A comprehensive list of fluoride ion sources are listed. lO Stannous fluoride is included in the list although no suggestion is made about its instability or that it could be used as an effective source of stannous ion. A variety of flavoring agents are disclosed. Included in a list of binders are gums and carboxyvinyl polymers.
U. S . Patent 3, 956, 479 describes use of quaternary anticalculus ~ c in dental creams, tables or powders containing policy;n~ agents such as water-insoluble phosphates, binders, detergents, gelling agents, flavoring agents, and fly ri~l~-containing such as sodium fluoride, stannous fluoride and sodium monofluorophosphate. MouthwAchDc are also described .
U.S. Patent 4,627,977 describes oral paste and gel dentifrice compositions containing a calculus25 inhibiting amount of a linear molecularly dehydratedpolyphosphate salt, and to inhibit hydrolysis of the polyphosphate salt in the saliva, a combination of a fluoride ion-providing source and a synthetic linear polymeric polycarboxylate. Included in the list of 30 suitable polycarboxylates are copolymers of maleic anhydride or acid and ethylenically unsaturated monomers including alkyl vinyl ethers available as Gantrez AN 139, AN lle, and S97. An extensive list of fluoride ion sources are provided, including sodium and stannous 35 fluorides and sodium monofluorophosphate. An extensive list of polishing agents are provided including waterinsoluble phosphates, silicates and silicas, bentonites _, . _ . _ _ _ . , _ _ . . . . _ _ _ _ _ _ _ and inorganic polishing agents. silicas are listed as pref erred .
A. Gaffar et al in Compen.Contin.Educ.Dent,
SUppl. No. 8, 242-250 (1987) and Thomas G. schiff in
Compen.Contin.Educ.Dent, Suppl. No. 8, 275-277 (1987) describe evaluations of pyrophosphate toothpaste compositions containing sodium fluoride and a copolymer of methoxyethylene and maleic anhydride known as "GANTREZ" as anticalculus dentifrices. The oral cavity lo contains enzymes which attack and degrade the pyrophosphates, rapidly removing their anticalculus activity. The enzymes require soluble magnesium ion for activity. The copolymer is provided to complex magnesium ions, making them unavailable to the enzymes and thus inhibiting their activity. Its purpose is to protect the pyrophosphates and maintain their anticalculus activity.
The present invention provides an aqueous stannous fluoride composition for oral care, containing an aqueous stannous fluoride composition for oral care, containing water-unstable stannous f fluoride and lower alkyl vinyl ether and maleic anhydride or maleic acid copolymer as the essential stannous ion chelate forming stabilizer, the amount of the copolymer being sufficient to efficiently stabilize the stannous fluoride concentration, the composition being substantially free from soluble pyrophosphates, silica containing ~ '- and aldehyde containing flavoring agents .
An embodiment of the invention resides in the stannous fluoride being in combination with a stannous ion chelating copolymer of an alkyl vinyl ether and maleic anhydride in an amount to effectively stabilize the stannous ion.
In an embodiment of the invention, the composition is an aqueous non-abrasive home treatment gel composition. In this ~ -nt, the composition may contain from 10 to 30 weight percent water, from 0.05 to S and preferably from 0.5 to 5 weight percent of 40 the chelating copolymer and from 0 . 05 to 5 and preferably from 0 . 3 to 0 . 5 weight percent stannous fluoride. The weight ratio of stannous fluoride to copolymer is preferably between 0 . 01 to 1. 0 . The composition is substantially free from all abrasives and aldehyde group containing flavoring agents.
In another embodiment of the invention, the composition is an aqueous mouthwash. In this embodiment, the composition may contain from 80 to 98 weight percent water, from 0.05 to 5 and preferably from o . 5 to 5 weight percent of the chelating copolymer and from 0. 05 to 5 and preferably from 0 . 05 to o. 5 weight percent stannous fluoride. The weight ratio of stannous fluoride to copolymer is preferably between o.o1 to l.o.
The composition is substantially free from soluble phosphates such as pyrophosphate and aldehyde group containing f flavoring agents .
In still another embodiment of the invention, the composition is an aqueous toothpaste. In this embodiment, the composition may contain from 10 to 30 weight percent water, from 0. 05 to 5 and preferably from 0 . 5 to 5 weight percent of the chelating copolymer and from 0 . 05 to 5 and preferably from 0 . 3 to 0 . 5 weight percent stannous fluoride and an insoluble abrasive agent. The weight ratio of stannous fluoride to copolymer is preferably between 0. 01 to 1. 0 . The composition is substantially free from silica, soluble phosphates such as soluble pyrophosphates t i . e ., tetrasodium pyrophosphate, tetrapotassium phosphates, tC. ), and aldehyde group containing compounds.
The method of this invention for formulating a stabilized aqueous composition for oral care comprises the step of dispersing the stannous fluoride in an aqueous solution of an alkyl vinyl ether and maleic anhydride or maleic acid copolymer as the essential stannous ion chelate forming stabilizer, the amount of the copolymer being sufficient to stabilize the stannous f fluoride concentration during formulation.
This invention i~ directed to t stannous fluoride formulation which is "effectively stabilized",
091/n7163 ' = PCI'/-IS90/0634~ _ 7 _ ~Ofi~3~3 1 that is, the stannous fluoride concentration in the product after three months at forty-five degrees centigrade remains at an acceptable therapeutic level.
Product stability after three months as forty-five degrees centigrade is comparable to product stability after three years at room temperature.
The essential ingredients of the compositions of this invention are stannous fluoride and the stannous ion chelating copolymer in an effectively stabilizing amount.
The term "effectively stabilized" and "effectively stabilizing amount" is defined to mean t}~at the stannous ion conic ~.~L.Ition~ e.~ seed as stannous fluoride, after three months storage under the conditions described in Example 3 is equivalent to about 70 percent or more of the original .ul~ce~Leltion of stannous ion at the time of formulation.
The stannous ion stabilizing copolymer is a copolymer of maleic anhydride or acid and a polymerizable ethylenically unsaturated monomer, preferably a lower alkyl vinyl ether such as methoxyethylene, having a molecular weight of from about 30,000 to 1,000,000. The mole ratios of the maleic anhydride or acid to the ethylenically unsaturated monomer is preferably from 1:4 to 4:1. Suitable polymers are available from GAF under the tradename "GANTREZ" and are disclosed in U.S. Patent 4,627,977.
These copolymers have the unique ability to form chelates with the stannous ion which are sufficiently strong to provide oxidation protection to the stannous ion while being sufficiently weak to not remove calcium f rom the tooth structure . EDTA and other strong chelating agents are undesirable because they deplete calcium from the tooth enamel.
The term "lower alkyl" is defined to be a straight or branch-chained hydrocarbon group having from 1 to 6 carbons and preferably from 1 to 4 carbons and including methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl and hexyl groups.
The compositions of this invention may contain other conventional: e Ls such as anti-foaming 5 agents, gelling agents, humectants, flavoring agents, anticariogenic agents, soluble fluoride ~ c, surfactants, coloring or whitening agents, antibacterial agents, preservatives, chlorophyll Cv~yv~ S~ and additional ammoniated materials which do not interfere 10 with the stability of the stannous ion by reacting therewith or with the stannous ion chelating polymer.
Suitable materials are described in U . S . Patents 4,418,057, 4,254,101 and 4,627,977.
The present compositions which are non15 abrasive home treatment gels may also containconventional aqueous gelling agents.
The compositions which are toothpaste __-.ds may contain one or more abrasive agents (other than silica or silicates) and can contain other 20 conventional ingredients to impart the desired consistency, texture, resistance to hardening, flavor and the l ike .
Suitable abrasive agents include insoluble phosphates such as calcium pyrophosphate, B-phase 25 pyrophosphate, and alkali metal metaphosphates. We hav6~ dlscv~ ed that the stabilizing function of the stannous ion chelating polymer is not effective in the presence of silica and silicates.
Any conventional humectant can be used. 30 Suitable humectants include sorbitol, glycerin, or other polyhydric ~1cnhnl~ the natural or synthetic gums conventionally used as hardening control agents and binder6 .
Suitable gelling agents for use in the non35 abrasive gel composition of this invention include from0.1 to 10 and preferably from 0.5 to S weight percent gelling agent. Gelling agents should be silica and -- -- _ _ _ _ _ _ _ . _ . . = _ _ _ _ _ _ _ ~ _ . _
91/0716~ -PCr/~lS9(~0634~
silicate free compounds such as Irish moss, gum tragacanth, starch, po1yvinlypyro1idone, hydroxyethyl propylcellulose, IIYdL~I~YIJU~Y1 methyl cellulose, hydroxypropyl methyl cellulose, ~IydLu~y~thyl cellulose, sodium caLl,~,by -thyl cellulose, and the like.
The compositions can also contain flavoring agents which do not have an aldehyde group. We have discovered that aldehyde-containing f flavoring agents such as cinnaldehyde, while not reacting directly with the stannous ion, interact with the stannous ion chelating polymer, allowing stannous oxidation to occur.
The non-abrasive gels may have a pH within the range of from 2 to 11 and preferably from 2.5 to 5Ø
The mouthwash compositions of the invention may have a pH within the range of from 2.5 to 1 and preferably from 3 to 7. The toothpaste compositions of the invention may have a pH within the range of from 2 to 11 and preferably from 3 to 7.
The formulations of this invention are manufactured using procedures which protect the stannous ion from oxidation. The stannous fluoride is initially dissolved in an aqueous solution containing the stannous chelating copolymer. This solution may be mixed with other ~ ~ Ls by conventional procedures to form the compositions of the invention. In a preferred procedure, a premix solution is prepared by dispersing from 0 . 5 to 26 weight percent stannous fluoride in water containing from 5 . 0 to 26 weight percent stannous ion stabilizing copolymer, the weight ratios of the stannous fluoride to copolymer being from 0 . 01 to 1. 0 in the premix solution. This solution can be then mixed with other --t.s by conventional ~OC~IUL~S to form the formulations o~ this invention. Additional protection from oxidation can be provided during manufacture by carrying out the ~Loc~duL~s in an inert a' - ,'^re.
For additional protection against the oxidation, the product should be stored in oxygen impermeable containers. Preferred containers are laminated tube such as or.T AMTNATT~ tubes (American can
Company). Suitable tubes are laminates of a flexible plastic such as a polyolefin (i.e., low density 5 polyethylene, etc. ) and an oxygen barrier layer such as an oxygen impermeable metal foil (i.e., aluminum foil).
The laminates include other conventional layers such as adhesives (i.e., ethylene copolymers), paper or other non-woven fibrous materials, and the like. For 10 toothpaste, the layer exposed to the stannous fluoride toothpaste should be essentially free from toxic substances and materials which would be released into the toothpaste during manufacture, storage or use and impair the stability of the toothpaste composition.
A preferred gel formulation can have the formulation shown in Table A-l.
Inqr~1ents - Weirlht Percent 20 Purified Water USP 10 - 20
Sorbitol Solution (70i) USP 50 - 80
Stannous chelating copolymer 0 . 5 - 5 . 0
Stannous Fluoride USP 0 . 3 - 0 . 5
Glycerin 96% USP 5 - 20 25 Sodium Ca~Lu.by hylcellulose 0.5 - 5.0
Flavor 0. 3 - 1. 0
Preservative 0 .1 - 1. 0
For additional protection against the 30 oxidation, the mouthwash product should be stored in containers which have low oxygen permeability and which preferably do not expose the contents to silica, silicates, oxygen, any other materials which would reduce the stability of the stannous ion, or introduce 35 physiologically unacceptable substances into the contents. Preferred containers are bottles made of an oxygen i - - hle organic polymer such as polyethylene 0 91/07163 2 ~ 4 3 ~ PCr/-l~9("(~6~" phthalate .
A preferred mouthwash formulation can have the composition shown in Table A-2.
This invention is further described by the 5 following specific but non-limiting examples.
Percentages are weight percents unless otherwise indicated . l'APiT.~ A--2
Ingredients Weight Percent
Purified Water USP 80 - 98
Stannous Chelating Copolymer O .1 - 5 . O
Stannous Fluoride O . 05 - O . 5
Tween-8 Oa o .1 - 2 . O
Pluronic F127G o .1 2 . O
Flavor O . 5 - 2
Glycerin 1 - 10
Sorbitol 1 - 10
Denatured Ethanol 1 - 10
Sodium Benzoate o. 01 - . 2
PEG 40c 0.1 -- 1.0
Tween-80a is polyoxyethylenesorbitan monooleate.
Pluronic F127G is a condensate of ethylene oxide with propylene oxide cnnAPnc~tes of propylene glycol.
PEG 40c is ~:sorbitan diisostearate available from Emery
Industries .
Preferred toothpaste formulations have the propositions bhop In Table A-3.
TARTAR A--3
Ingredients WeiGht Percent
Purified Water DSP 10 - 30
Carbopol o . 05 - 1. 0
Sodium CMC o .1 - 2 . 0
Glycerin 96S USP 5 . O - 30
Xanthan Gum (KELTROL) O .1 - 1. 5
Methylparaben NF 0.1 - 5. 0 10 Propylparaben NF 0 . 01 - .10
Polyethylene Glycol 400C o .1 - 4 . 0
Stannous Chelating Copolymer 0 . 5 - 5 . O stannous Fluoride O . 3 - O . 5
Sorbitol 70~ USP 10 - 35 15 Sodium Saccharin USP Crystal 0 . 05 - O . 5
Calcium pyroferrite 30 - 45 zinc Citrate 0.1 - 2 . 0
Insoluble Sodium 25wt;~rhosFh~te 30 - 45
Sodium Lauryl Sulfate Needles 0 . 05 - 3 . O 20 Sodium Hydroxide NF (10% soln) 0.5 - 5.0
Flavor o . 5 - 1. 5
C~rbOpOla iB a carboxyvinyl polymer available from B. F.
Goodrich Company.
Sodium CMC is ca-l,u,.y - thyl cellulose .
Polyethylene Glycol 400C is polyethylene glycol having a molecular weight of about 400, available from Union
Carbide .
R~AMPLR 1
An aqueous solution containing methyl vinyl ether-maleic anhydride copolymer and percent stannous fluoride iB mixed with the other ingredients listed below to form a non-abrasive home treatment gel product having the following composition:
~jO 9l/07l63 PCr/~lS91)/(~63J~
Ingredients Weight Percent
Purified Water USP 18 . 00
Sorbitol Solution (70%) USP 66.85
Copolymer2 1. 00 5Stannous Fluoride USP 0 . 44
Glycerin 96% USP 10. 00
Sodium Carboxymethylcellulose 1.70
Blue FD&C #1 (1% solution) 0.90
Yellow FD&C #10 (1% solution) 0.61 10Flavor - Felton Spearmint HF
Triple Distilled A-1895 0.50
Copolymer is the free acid of a methyl vinyl ether and maleic anhydride copolymer having a molecular weight of about 30,000 to about l,OOo,000.
FXAMPT,F 2
The procedure of Example 1 was repeated to form another non-abrasive home treatment gel including the following ingredients:
Ingredients - Weight Percent 20 Purified Water USP 18 . 00
Sorbitol Solution (70%) USP 66.235
Copolymer 1. 00
Stannous Fluoride USP 0 . 44
Glycerin 96 USP 12 . 00 25Sodium Ca~Lu,.y sthylcellulose 1.70
Grape Flavor #11540 0.50
Tartaric Acid 0.125
Copolymer is the free acid of a methyl vinyl ether and maleic anhydride copolymer having a molecular weight of about 30,000 to about 1,000,000.
AMPT.~ 3
The non-abrasive home treatment gel of Example 1 was analyzed to determine the initial concentrations of stannous and fluoride ions achieved at formulation 35 and to determine the initial ion concentrations after 1, 2, and 3 months storage at 45-C. in sealed oxygen t ,- --hle tubes.
The following results were obtained, concentrations being reported as weight percents.
Sn as SnF2 F as Snf2 ~
Initial 0.463 0.432 3.6 5one month 0 . 412 0 . 4 21 3 . 8 two months 0.410 0.417 3.8 three months 0.398 0.405 3.8^
F~AMPJ,~ 4
The non-abrasive home treatment gel of Example 10 2 was analyzed to determine the initial concentrations of stannous and fluoride ions achieved at formulation and to determine the initial ion concentrations after 1, 2, and 3 months storage at 45-C. in sealed oxygen impermeable tubes.
The following results were obtained, concentrations being reported as weight percents.
CiE~ Sn as SnF2 F as Snf2 E~
Initial 0.461 0.433 3.5 one month 0 . 423 0 . 418 3 . 6 20 two months 0 . 423 0 . 413 3 . 6 three months 0.413 0.409 3.7
E'X~MPLE S
The following Example illustrates the stabilizing effect of the alkyl vinyl ether/maleic 25 anhydride copolymers on stannous fluoride in an aqueous environment such as encountered during formulation of ~a....bus fluoride containing oral care products. Two
Eample solutions Or 0 . 455 percent by weight stannous fluoride in deionized water were prepared. In the first 30 sample solution, the stannous fluoride was added to the deionized water. In a second sample solution, the stannous fluoride was added to a solution of 1 percent by weight of methyl vinyl ether-maleic anhydride copolymer in deionized water. In the rirSt sample 35 solution a precipitate of stannous oxides appeared almost immediately and the intensity of the precipitate increased with time. Analyses of the supernatant and _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ . . .... . .. _ _ .. .. ..
0 91tO7163 PCI`/-~S9~1/063~(~
sediment portions of centrifuged samples revealed that the concentration of stannous fluoride in the supernatant and sediment portions were o . 371 percent by weight and 0 . 099 percent by weight respectively. The 5 second sample solution was clear and there was no evidence of precipitation . These results were conf ired by comparative sample analyses using a turbidity meter.
Analyses of the supernatant and sediment portions of centrifuged samples revealed that the concentration of 10 stannous fluoride in the supernatant was o . 456 percent by weight and no stannous fluoride was detected in the sediment portion. r~xAMPT,r~ 6
An aqueous solution containing methyl vinyl 15 ether-maleic anhydride copolymer and percent stannous fluoride is prepared to form a stabilized stannous fluoride solution. This solution is mixed with the other ingredients listed in Table A-4. The amounts of the ingredients are selected- to yield a final mouthwash 20 composition having the following composition:
TARr,r~ A--4
TnS7rP~l i ents Weight Percent
Purified Water 70.75 25 Glycerin 96% USP 15 . 00
Stannous Fluoride 0.10
Copolymer ' 10. 00
Sodium phosphate, dibasic USP 0. 05
FD&C Blue #1 (1% solution) 0.05 30 FD&C Yellow #10 (1~ solution 0.15
Ethyl Alcohol 95% USP 2 . 50
Methyl Paraben 0.10
Propyl Paraben 0 . 01
PEG 40b 0. 30 35 Spice Mint flavor (Noville # 30712) 0.06
Copolymer is the free acid of a methyl vinyl ether and maleic anhydride copolymer having a molecular weight of about 70,000, benzene-free, and sold under the tradename GANTREZ S-97BF by GAF
Corporation. It is purchased in a liquid form containing 10 wt. % copolymer.
PEG 40b is sorbitan diisostearate available from Emery
Industries .
F~X~MPT,F 7
An aqueous solution containing methyl vinyl ether-maleic anhydride copolymer and percent stannous fluoride is prepared to form a stabilized stannous fluoride solution. This soll~ti~n is mixed with the other ingredients listed in Table B below. The amounts of the ingredients are s~lec~e~l to yield a final toothpaste composition having the following composition:
TABLE B
inbred 1 ents Weight Percent
Purified Water - 29.00 20 Polyethylene Glycol 400 0.40
Glycerin 96% USP 5. 00 r5ethylparaben NF 0.15
Propylparaben NF . 05
Copolymer 1. 00 25 Stannous Fluoride O . 455
Sodium Hydroxide ( 10% solution) 4 . 50
Sorbitol 70% USP 16 . 275
Sodium Saccharin USP Crystal O . 20
Calcium Py~u~h~ hate 40 00 30Zinc Citrate o . 40
Glycerine 96% USP 5 . 00
Natural Mint Flavor A-1159 FELTON 1. oo
Sodium Lauryl Sulfate Needles 1. 00 5 Copolymer is the free acid of a methyl vinyl ether and maleic anhydride copolymer having a molecular weight of about 70,000, benzene-free, and sold _ _ _ _ _ _ _ _ _ ... . _ _ _ _ _ _ . . _ . _ . .
091/û7163 PCr/l'S9~ ,3~1)
under the tradename GANTREZ 5-97BF by GAF
Corporation .
E~AMPT~ 8
Dentifrice compositions prepared as described 5 in Example 7 and having the formulations shown in Table
C were analyzed to determine the initial concentrations of stannous and fluoride ions achieved at formulation and to ~l~ote~m;nD the initial ion concentrations after 1, 2, and 3 months storage at 45-C. in sealed oxygen 10 j ,- ~-hle tubes.
TABLE C
Weight Percent
ingredients A B C D 15Purified Water 29.00 29.00 29.00 29.00
Carbopol 950 0.20 0.20 0.20 0.20
Glycerin 96% USP 10.00 10.00 10.00 10.00
Xanthan Gum 0.15 0.40 0.40 0.40
Methylparaben NF 0. 15 0 .15 0 . 15 0 . 15 20Propylparaben NF - 0 . 02 0 . 02 0 . 02 0 . 02
Copolymer 1.00 1.00 1.00 1.00
Stannous Fluoride 0.455 0.455 0.455 0.455
Sodium Hydroxide (10% solution) 4.50 4.50 4.50 4.50 25Sorbitol 70% USP 21.225 10.275 16.675 16.675
- sodium Saccharin USP
Crystal 0.20 0.20 0.20 0.20
Calcium Pyrophosphate 30.00 35.00 35.00 35.00
Zinc Citrate 0.80 0.80 0.40 0.40 30Natural Mint Flavor
A--1159 FELTON 1. o0 1. 00
Doublemint Flavor #30672 Noville 1.00 1.00
Sodium Lauryl Sulfate 35Needles 1. 00 1. 00 1. 00 1. oo
Copolymer is the free acid of a methyl vinyl ether and maleic anhydride copolymer having a molecular weight of about 70,000, benzene-free, and _ _ ...... . . _ .: ..... _ _ _ _ _ _ _ _ _ _ _ .
sold under the tradename GANTREZ S-97BF by GAF
Corporation .
The following results were obtained, concentrations being reported as weight percents.
Formulation A ~i~ Sn as SnF2 F as snF2 Initial 0 . 453 0 . 420 5 . 2 one month 0.435 0.439 5.2 two months 0 . 458 0 . 428 5 .1 10 three months 0.412 0.414 5.2
Formulation B
Cis Sn as SnF2 F as SnF2 E2~
Initial 0.479 0.430 5.1 one month 0.444 0.442 5.1 15 two months 0 . 402 0 . 398 5 . 2 three months 0 . 433 0 . 353 5 . 2
Formulation C
Cin Sn as SnF2 F as SnF2 ~
Initial 0 . 454 0 . 452 5 . 3 20 one month 0.439 0.472 5.2 two months 0 . 4 6 8 0 . 4 7 2 5 . 2 three months 0 . 477 0 . 469 5 . 3
Formulation D ~m~ Sn a8 SnF2 F as SnF2 PEI 25 :initial 0.447 0.429 5.7 one month 0.443 0.440 5.6 two months 0.455 0.420 5.8 three months 0 . 458 0 . 441 5 . 8 1; XAMPT.TiN 9
Dentifrice compositions prepared as described in example 7 and having the formulations shown in Table
D were analyzed to determine the initial c~ ,e.,~ atiOnS of stannous and fluoride ions achieved at formulation and to determine the initial ion col.c~.,trations after 1, _ = ., _, ... . _ _ . _ . ~ . . _ _ _ _ _ _ _ _
0 91/07163 PCT S90/0634(1
- 19 - 2068431 2, and 3 months storage at 45 C. in sealed oxygen ^ --hle tubes.
Wei.tht Percent
Ingredients E F G H
Purified Water 29.50 22.50 29.50 24.50 i7.00
Carbopol 950 0.30 0.20 0.20
Glycerin 96% USP 10 . 00 10 . 00 10 . 00 10 . 00 10 . 00 10Xanthan Gum 0.50 0.60 0.80 0.80 0.70
CaLl,~ by thyl
Cellulose 0 . 40 0 . 30
Methylparaben NF 0.15 0.15 0.15 0.15 0.15
Propylparaben NF 0 . 02 0 . 02 0 . 02 0. 02 0 . 02 15Copolymera 1. 00 1. 00 1. 00 1. 00 1. 00
Stannous Fluoride 0.455 0.455 0.455 0.455 0-43
Sodium Hydroxide (10% solution) 4.50 3.00 4.50 4.00 3.00
Sorbitol 70% USP 14 . 975 24 . 275 14 . 975 15 . 875 24 . 40 20Sodium Saccharin USP
Crystal 0.20 0.20 0.20 0.20 0.20
Calcium
PyrofhocrhAte 35 . oo 35 . oo 35 . oo 40 . oo 40 . oo
Zinc Citrate 0.40 0.40 0.40 0.80 0.80 25Tween-80b 1. 0
Pluronic R127C 0 . 80
Nint Flavor
A--1159 FELTON 0 . 8 0 . 8 0 . 80 1. 00 1. 00
Sodium Lauryl Sulfate 30Needles 1.2 1.2 1.2 1.00 1.00
Copolymer i8 the free acid of a methyl vinyl ether and maieic anhydride copolymer having a molecular weight of about 70,000, benzene-free, and sold under the tradename GANTREZ S-97BF by GAF
Corporation .
Tween-80b is polyoxyethylenesorbitan monooleate.
Pluronic R127C is a cA~n~ nc~te of ethylene oxide with propylene oxide cAn~ncates o~ propylene glycol.
The following results were obtained, concentrations being reported as weight percents.
Formulation E ~im~ Sn as SnF2 F as SnF2 E~ 5Initial 0.462 - 0.453 5.6 one month 0 . 4 3 2 0 . 4 4 9 5 . 6 two months 0 . 453 0 . 444 5 . 4 three months 0 . 4 31 0 . 4 5 3 5 . 4
Formulation F 10min Sn as SrF2 F as SnF2 ~
Intial 0 . 471 0 . 435 5 . 2 one month - 0 . 3 9 o 0 . 4 41 5 . 2 two months 0.415 0.436 5.0 three months 0 . 418 0 . 429 5 . 0
Formulation G
Sn as SnF2 F as SnF2 E2~
Initial 0.456 - 0.449 5.8 one month 0 . 4 4 5 0 . 4 3 9 5 - 7 two months 0 . 451 0 . 449 5 . 5 20 three months 0.~54 0.430 5.4
Formulation H
Sn A~ SnF2 F as SnF2 ~I
Initial 0.462 0.460 5.4 one month o . 464 o. 438 5 .1 25 two months 0.459 0.440 5.1 three months 0 . 4 5 o 0 . 4 4 5 4 . 9
Formulation I ~i~ Sn as SnF2 F as SnF2 ~
Initial 0 . 469 0 . 438 5 . 2 30 one month 0 . 396 0 . 407 4 . 9 two months 0.414 0.410 4.9 three months 0 . 398 0 . 409 4 . 6