AU679696B2 - Gel-type toothpaste composition - Google Patents

Description

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AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT 0 0* *0

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ORIGINAL

Name of Applicant: Actual Inventor: or ervice: :Address for Service: JOHNSON JOHNSON CONSUMER PRODUCTS, INC.

Hitoshi Watanabe SHELSTON WATERS Clarence Street SYDNEY NSW 2000 S S

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Invention Title: "GEL-TYPE TOOTHPASTE COMPOSITION" The following statement is a full description of this invention, including the best method of performing it known to us:- Y 9 la 9* S S 0** S C Industrial Field of Use The present invention concerns a gel-type dentifrice composition which is excellent both in the dispersibility and shape retainability.

Prior Art Dentifrices are usually classified into toothpaste and tooth powder. The tooth powder is not c ~s 2 predominant in the dentifrices since the dispersiblity in an oral cavity is poor. On the other hand, the toothpaste has been used most generally at present since it not only is convenient in handling being in a paste form but also has a least shape retainability and dispersibility required for the dentifrices.

However, it is preferred that the dentifrice has dispersiblity in the oral cavity as high as possible. In view of the above, a liquid form is 10 preferred for the dentifrice. Then, a commrrcial good in the form of an aqueous dentifrice is actually present. Such aqueous dentifrice can not be placed on a toothbrush upon brushing. It is still difficult, however, and not practical as well to conduct brushing 15 while keeping the aqueous dentifrice in a mouth.

Accordingly, although the merit of the aqueous dentifrice is recognized, it does not become a substitute for the toothpaste, yet.

By the way, the toothpaste generally comprises 10 to 50% means hereinafter by weight" unless otherwise specified) of an abrasive such as silica and about 10 to 40% of water. Why its water content is restricted to 10 40% is to keep the shape retainability and not to lose the paste form when it is gl 3 squeezed out of a tube onto a toothbrush (to keep shape retainability). Further, the abrasive is blended up to 50% for improving the tooth brushing effect and contributing to the improvement of the shape retainability.

Further, it has heretofore been known to add a carboxyvinyl polymer as a binder to the toothpaste (Japanese Patent Laid Open Sho 49-133535 and Sho 61- 15825). The toothpaste described above contains as much as 1 to 40% of water and 15 to 25% of an abrasive precipitation silica.

Further, Japanese Patent Laid Open Patent Sho 60-15045 discloses a dentifrice not containing a solid ingredient (abrasive) but containing 1 to 2.5% of an acrylic resin, as well as a foaming agent, glycerin, alcohol, perfume and the like.

Subject to be Solved by the Invention In this way, various preparations have been disclosed for toothpastes. However, so-called "gel-type toothpaste" which contains more than 50% of water to improve the dispersibility in the oral cavity has not yet been proposed.

The present invention has been accomplished in view of the foregoing situations. It is an object ~e 4 thereof to provide a gel-type toothpaste of good dispersibility which still maintains shape retainability capable of keeping a predetermined shape when it is placed on a toothbrush. The aimed gel-type toothpaste is to lose the shape, and to be liquefied and dispersed as soon as it is put into a mouth and brushing is started.

Means for Solving the Subject and Function In order to solve the foregoing subject, the present invention provides a gel-type toothpaste composition comprising: 55 to 90% of water; 1 to 10% of an abrasive; 0.01 to 5.0% of a carboxyvinyl polymer; S e o 2

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and 0.05 to 3.5% of one or more of binders selected from the group consisting of xanthane gum, CMC- Na, carrageei.an and methyl cellulose.

According to the gel-type toothpaste of the present invention, shape retainability comparable with that of the toothpaste can be attained by means of a specific abrasive and a binder, while it contains .55% or more of water and exhibits an excellent dispersibility in a oral cavity.

ii I r- 5 As the abrasive contained in this gel-type toothpaste composition, anhydrous silicic acid, alumina, calcium hydrogenphosphate, aluminum hydroxide and the like are used. The abrasive is blended by 1.0 to 10.0%.

If it is less than no sufficient polishing effect as a dentifrice can be obtained. Nevertheless, a smaller amount of the abrasive is preferred in order not to inure enamel material or dentine of teeth. The geltype toothpaste of the present invention, can demonstrate the polishing effect equivalent to that of the existing toothpastes even with 10% or less of abrasive and achieve an improvement for the dispersibility.

The carboxyvinyl polymer is identical with the 15 so-called cross-linked acrylic acid polymer. It includes no straight chain polyacrylic acids. As the 4 carboxyvinyl polymer of this type, Carbopol® 934, 940 and 941 of B.F. Goodrich Company and Hibiswako® 104 and 105 of Wako Jun'yaku Co. are commercially available.

20 Among them, Hibiswako 105 is preferred because it has strong salt resistance not causing reduction of the viscosity due to shrinkage of molecules even under the presence of salt, that is, ions -of dissociated ingredients). This carboxyvinyl polymer is incorporated 4.

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6 so as to prevent the remarkable reduction of viscosity even under the coexistence of such a salt because a salt such as sodium fluoride is blended as a carious preventive in a dentifrice. The carboxyvinyl polymer is contained by 0.01 to This is because the effect of increasing the viscosity is not obtained in an amount of less than 0.01% and, on the other hand, there is a problem in the shape retainability if it exceeds Further, in the composition according to the present invention, one or more of binders selected from the group consisting of xanthane gum, CMC (carboxymethyl cellulose)-Na, carrageenan and methyl cellulose are blended. While such substances have been used as the binder for the dentifrice, it has been found in the 15 present invention that they can outstandingly improve Sthe viscosity of the dentifrice when they are added with 6 6 the carboxyvinyl polymer. Accordingly, the excellent shape retainability can be accomplished in the gel-type toothpaste composition with .55% or more of water by 20 adding carboxyv polymer and one or more of binders of xanthane gum, CMC-Na, carrageenan and methyl o0 cellulose.

In the gel-type toothpaste composition according to the present invention, those ingredients l 7 often blended in general dentifrices can be incorporated in addition to the above-mentioned essential ingredients. As for such ingredients, there can be used, for example, a foaming agent (sodium lauryl sulfate), a consistency adjuster such as sorbitol, polyethylene glycol, polypropylene glycol and glycerine, perfume, sweetener, (saccharine-Na, etc.) preservative (benzoic acid), pH controller (sodium hydroxide or the like), perfuming agent (plant extract), coloring agent 10 or the like, as well as a various xinds of pharmaceutical agents such as fluorine-containing compound (sodium fluoride, etc.), trichlothane, polyphosphoric acid, cetyl pyridinium chloride and chlorohexidine gluconate.

S" 15 Examples For Examples 1 6 according to the present invention, shape retainability (state placed on the toothbrush) and feeling upon use (dispersiblity in an oral cavity and easiness of brushing) were evaluated in comparison with Comparative Examples 1 3 not containing the ingredients as in the present invention.

At first, the compositions are shown in the following tables 1 9, respectively, for each of the II c~ 8-

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[Table 1] Composition for Example 1 Ingredient Content(% Purified watez 86.70 Silicic anhydride 3.00 CVP (Carbopole 941) 0.75 Xanthane gum 0.80 Sodium lauryl sulfate 1.50 Glycerine 5.00 Benzoic acid 1.00 Perfume 1.00 Saccharine-Na 0.05 NaF 0.20

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9- [Table 2] Composition for Example 2 *0 Ingredient Content(% Purified water 76.38 Silicic anhydride 8.00 CVP (Carbopole 941) 0.50 CMC-Na 0.50 Sodium lauryl sulfate 3.00 Sorbitol 5.00 Glycerine 5.00 Benzoic acid 0.10 Perfume 1."l§ Saccharine-Na 0.01 Chlorohexidine gluconate 0.50 Sodium hydroxide 0.01 C. *C

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10 Table 3] Composition for Example 3 o *900*O 0 0000 0* S. 0 0* 5 0

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Ingredient Content(% Purified water 55.25 Aluminum hydroxide 10.00 CVP (Hibiswako, 105) 2.50 Carrageenan 1.50 Sodium lauryl sulfate 3.00 Polyethylene glycol 5.00 Sorbitol 15.00 Glycerin J 5.00 Benzoic acid 1.00 Perfume 0.50 Saccharine-Na 0.01 Polyphosphoric acid 1.00 Cetyl pirridinium chloride J 0.05 Sodium hydroxide J 0.10 S S

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S S I I (Table 4] Composition for Example 4 b* 0 Ingredient Content(% Purified water 64.8 Calcium hydrogen phosphate 10.0 CVP (Hibiswako 104) Methyl cellulose Sodium lauryl sulfate Sorbitol 15.0 Benzoic acid Perfume Saccharine-Na _NaF 0.2 **0 be S 12 [Table Composition for Example 9* Ingredient Content Purified water 65.5999 Silicic anhydride 1.0000 CVP (Carbopol 941) 0.2000 Xanthane gum 0.1000 CMC-Na 0.3000 Glycerin 10.0000 Sorbitol 15.0000 Benzoic acid 2.0000 Perfume 1.0000 Alcohol 3.0000 Plant extract 0.1000 Saccharine-Na 1.0000 Sodium hydroxide 0.5000 NaF 0.2000 Coloring agent 0.0001 13 [Table 6] Composition for Example 6 0 a a ingredient Content M% Purified water 58.799 Alumina 8.500 CVP (carbopcol 941) 2.500 Xanthane gum 0.500 CMC-Na 0.200 Car rageen6an 0.100 Glycerin 12.000 Sodium lauryl sulfate 4.000 Sorbitol 10.000 Benzoic acid 1.000 Perfume 2.000 Saccharine-Na 0.100 Sodium hydroxide 0.100 NaF 0.200 LColoring agent 0.001 0 14 [Table 7] Composition for Comparative Example 1

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Ingredient Contuit(% Purified water 38.8 Silicic anhydride 30.0 CVP (Hibiswako 104) Sodium lauryl sulfate 70% Sorbitol 22.0 Benzoic acid Perfume Saccharine-Na NaF 0.2

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15 [Table 8] Composition for Comparative Example 2

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Ingredient Content Purified water 36.9 Alumina 40.0 CVP (Hibiswako 104) Sodium lauryl sulfate 70% Sorbitol Polyethylene glycol 10.0 Benzoic acid Perfume Saccharine-Na Trichlothane Sdum hydroxide 0.1 S. *S

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S S S SO *5 0 16 [Table 9] Composition for Comparative Example 3 *0 *000 0:90: 0e *O *0 ab Ingredient Content Purified water 14.0 Silicic anhydride 17.0 Sodium lauryl sulfate 70% Sorbitol 62.0 CNC-Na Perfume Saccharine-Na 0.2 Sodium hydroxide Coloring agent 0.2 a S S a. U a *0 Then, the functional evaluation regarding the shape retainability and the feeling upon use was made with a 5-point method by 20 panelists for the above nine types of dentifrices compositions.

In this case, the following evaluation standards were employed for the 5-point method on each of the evaluation items for the shape retainability and the feeling upon use.

(Evaluation Standards for Shape Retainability) five points (stable without change of shape) i- l I- II L-A I 17 four points (without change of shape) three points (without change of shape but instable on toothbrush) two points (with change of shape, and impregnation into toothbrush) one point (almost liquid and instantly impregnating into toothbrush) (Evaluation Standards for the Feeling upon Use) five points (excellent dispersibility with very

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S 10 easy brushing) four points (good dispersibility with easy brushing) three points (ordinary dispersibility and brushing performance) two points (somewhat poor dispersibility)

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one point (poor dispersibility, dentifrice does not easily prevail within a mouth upon brushing) S* The results of the functional evaluation are shown in the following Table c a 18 [Table Result of the Functional Test by Panelists Example Comp.

Example Item Score 1 2 3 A 5 6 1 2 3 Shape 1 0 0 0 1 0 0 17 15 retain- 2 1 3 0 2 0 2 3 3 7 ability 3 8 2 4 5 1 2 0 1 3 4 10 12 15 10 15 9 0 1 0 5 1 3 1 2 4 7 0 0 0 Disper- 1 0 0 0 0 0 0 3 2 1 sibility 2 0 0 0 1 1 2 5 5 8 3 7 2 1 0 5 4 9 10 11 4 11 15 17 19 12 11 3 3 0 2 3 2 0 2 3 0 0 0 (unit: person) For the convenience of comparison for the result in Table 10, weighted average was taken for the number of panelists and is shown in the following Table 11.

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S. S S S S ~d c~ 19 [Table 11] Weighted Average for the Result of Functional Evaluation in Table Example Comp.

Example Ites 1 2 -3 4 5 6 1 2 3 Shape retain- 3.55 3.75 3.85 3.50 4.15 4.05 1.15 1.40 1.65 ability Disper- 3.75 4.05 4.05 3.90 3.75 3.75 2.60 2.70 2.50 sibility

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*0 (unit: person) As can be seen in Table 11, all of the geltype toothpaste compositions in Examples 1 6 are remarkably superior with respect to the score for both of the shape retainability and feeling upon use as 5 compared with those of the toothpastes of Comparative Examples 1 3. Accordingly, confirmed is the superiority of the gel-type toothpaste composition according to the present invention over the conventional tooghpaste.

Further, although the gel-type toothpaste compositions in each of the examples described above contains only a little amount of the abrasive as low as 1 10% compared with the toothpaste in the comparative -r r~s I mrssa I 20 examples, it has been found that they show substantially the same polishing effect.

Effect of the Invention As has been described above, the gel-type toothpaste composition according to the present invention possesses the shape retainability capable of retaining a specific shape when it is placed on a toothbrush while. This composition also provides satisfactory dispersibility which not found in the 10 conventional toothpastes in that its shape is lost and it becomes liquefied and dispersed as soon as it is put into a mouth and brushing is started.

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Claims (2)

1. Gel-type toothpaste composition comprising: (A) (B) (C) 55 to 90 Wt. of water; 1 to 10 wt. of an abrasive; 0.01 to 5.0 wt. of a carboxyvinyl *0 S *0SS S S *5 0 S 0 *0 S S S 00 *5*S SO *5 6 *0S S SS 0O S S polymer; and 0.05 to 3.5 wt. of one or more of binders selected from the group consisting of xanthane gum, CMC-Na, carrageenan and methyl cellulose.

2. A gel-type toothpaste composition according to Claim 1 substantially as herein described with reference to any one of the Examples excluding the comparative Examples. DATED this 5th Day of May 1997 JOHNSON JOHNSON CONSUMER PRODUCTS, INC. Attorney: IAN ERNST of S-ELTNWTR ,V