JP2000191484A - Dentifrice composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dentifrice composition capable of foaming by brushing and brushing teeth for a long period without dripping the foam from a mouth even when brushing the teeth for the long period due to a slight reduction in viscosity of the foam even when diluted with saliva. SOLUTION: This dentifrice composition contains 0.5-20 wt.% of a surfactant, e.g. a fatty acid ester of a sugar (alcohol), 1-3 wt.% of a binder, e.g. xanthan gum, 10-70 wt.% of a humectant, e.g. glycerol, 5-70 wt.% of a polishing agent, e.g. calcium secondary phosphate dihydrate and 10-50 wt.% of water and is capable of foaming by brushing and causing a slight reduction in viscosity of the foam even when diluted with saliva. The value of complex modulus of elasticity G* obtained by a dynamic viscoelastic measurement of the foam produced by brushing is >=300 dyne/cm2, preferably 300-600 dyne/cm2 and the value of dynamic loss tangent tanδ is preferably 0.5-1.5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dentifrice composition in which foam does not drip from the mouth even after prolonged brushing.

[0002]

2. Description of the Related Art Recently,
With increasing awareness of oral hygiene, the time spent on a single brushing is increasing. However, there is a problem that when brushing with a conventional dentifrice for a long time, the foam drips from the mouth and stains hands and clothes.

[0003]

Means for Solving the Problems The present inventor has studied the foam when brushing for a long time, and as a result, the foam generated by brushing is diluted by the saliva, and the physical properties of the foam, especially the viscosity of the foam, decrease. I knew that drooling would occur. Thus, it has been found that if this viscosity reduction is prevented, the foam will not easily drip from the mouth even after brushing for a long time.

[0004] That is, the present invention provides a dentifrice composition which foams by brushing and has a small decrease in viscosity of the foam even when diluted with saliva.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A characteristic of the dentifrice composition of the present invention is that the viscosity of foam generated by brushing is hardly reduced even when diluted with saliva. If the design is made so that the complex elastic modulus G * value obtained by the dynamic viscoelasticity measurement becomes 300 dyne / cm ² or more, it can be prevented well. The complex elastic modulus G
* The value is more preferably designed to be 300 to 600 dyne / cm ² . The dynamic loss sine tan δ value obtained by measuring the dynamic viscoelasticity of the foam is more preferably 0.5 to 1.5.
The dynamic viscoelasticity of foam generated by brushing is
Dynamic strain sweep method, using a double cylindrical cell, temperature 37 ° C, frequency 20 rad / s, measured strain 0.1 to 10%
Is preferably measured.

The composition of the dentifrice composition of the present invention is not limited as long as it is designed so that the viscosity of the foam generated by brushing does not decrease. More preferably, it contains a surfactant, a binder, a wetting agent, an abrasive and water. The surfactant is 0.5 to 20% by weight (hereinafter simply indicated as%), the binder is 1 to 3%, the wetting agent is 10 to 70%, and the abrasive is 0 to 0%.
70% (more preferably 5-70%), water is 10-50
% Is preferred.

Examples of the surfactant include nonionic surfactants such as fatty acid esters of sugars or sugar alcohols, polyoxyethylene sorbitan fatty acid esters and polyoxyethylene fatty acid esters; alkyl sulfate salts, higher fatty acid monoglyceride sulfonate salts, and higher fatty acids. Anionic surfactants such as monoglyceride sulfate salts, N-methyl-N-long-chain acyltaurine salts, N-long-chain acylsarcosinates, N-long-chain acylamino acid salts such as N-long-chain acyl-β-alanine; Examples include amphoteric surfactants such as 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, alkyldiaminoethylglycine hydrochloride, and lauryldimethylaminoacetic acid betaine. Examples of the wetting agent include glycerin, sorbit, propylene glycol, 1,3-butylene glycol, ethylene glycol, polyethylene glycol, polypropylene glycol, xylit, maltitol, lactit and the like. As a polishing agent, dibasic calcium phosphate dihydrate and anhydride, monobasic calcium phosphate,
Tertiary calcium phosphate, calcium carbonate, calcium pyrophosphate, calcium sulfate, aluminum hydroxide, alumina, silica-based abrasive, aluminum silicate, insoluble sodium metaphosphate, tertiary magnesium phosphate, magnesium carbonate, silicic anhydride, hydrated silicic acid, Examples include crystalline cellulose and polyacrylic acid resin.

[0008] In the present invention, a component particularly important for preventing the foam viscosity from decreasing is a binder.
Anionic binders and / or nonionic binders are included. Particularly preferred binders are one or more selected from xanthan gum, hydroxyethyl cellulose and sodium carboxymethyl cellulose. Of these, 1
% Aqueous solution viscosity is 500 to 3000 mPa · s, 1% aqueous solution is 1000 to 10000 mPa
More preferably, use is made of hydroxyethylcellulose having a viscosity of 1 to s and a sodium carboxymethylcellulose having a 1% aqueous solution viscosity of 100 to 2000 mPas. When hydroxyethyl cellulose is used, it is more preferable to use one having a degree of etherification of 0.5 to 2.0, particularly 1.0 to 1.5. When using sodium carboxymethylcellulose, the degree of etherification is 0.8 to
It is more preferable to use those having a ratio of 2.5, particularly 1.2 to 2.0.

The dentifrice composition of the present invention may further contain a tooth enhancer, a sweetener, a coloring agent, a preservative, a bactericide, an anti-inflammatory, a blood circulation promoter, enzymes, fragrances, a pH adjuster, and the like. Can be.

[0010] The dentifrice composition of the present invention is particularly preferably in the form of a toothpaste.

[0011]

EXAMPLES Examples 1 to 7 and Comparative Examples 1 and 2 Toothpastes having the compositions shown in Table 1 were prepared under certain conditions (toothbrush: commercially available spherical bristles, hardness of toothbrush: normal, brushing method: side brushing). , Brushing load: 300 ~
The toothbrush was brushed with 400 g and the amount of toothpaste used: 1 g), and the time (minutes) until foam began to drip from the mouth was measured. On the other hand, two minutes after the tooth brushing was started, the foam was directly transferred to the measuring cup, and the dynamic viscoelasticity of the foam was measured. The measuring instruments and measuring conditions are as follows.

(Measurement device) Fluid spectrometer Rheometrics, RFS-II manufactured by Rheometrics (Measurement conditions) Measurement method: Dynamic strain sweep method Measurement cell: Double cylindrical cell (Cuoetto) Measurement temperature: 37 ° C -Frequency: 20 rad / s-Measurement distortion: 0.1 to 100%

Table 1 shows the obtained results.

[0014]

[Table 1]

As is clear from Table 1, in a dentifrice in which the viscosity of foam generated by brushing does not decrease, that is, a dentifrice having a G * value of 300 dyne / cm ² or more, the brushing time until the foam drips from the mouth. It was longer than 4 minutes.

[0016]

The use of the dentifrice of the present invention makes it possible to brush for a long time without foam dripping from the mouth even after brushing for a long time.

Claims (4)

[Claims] 1. A dentifrice composition foamed by brushing and having a reduced viscosity of the foam even when diluted with saliva. 2. The complex elastic modulus G * value obtained by dynamic viscoelasticity measurement of foam generated by brushing is 300 dyne.
The dentifrice composition according to claim 1, which is at least / cm ² . 3. The complex elastic modulus G * value obtained by dynamic viscoelasticity measurement of foam generated by brushing is 300 to 6.
3. The dentifrice composition according to claim 1, wherein the dentifrice composition is 00 dyne / cm ² . 4. A complex elastic modulus G * value of 300 to 6 obtained by dynamic viscoelasticity measurement of foam generated by brushing.
00dyne / cm ² , dynamic loss sine tan δ value is 0.5-1.
The dentifrice composition according to any one of claims 1 to 3, which is 5.