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Low-Stringiness Thickener and Cosmetic Material Admixed with Said Thickner

a technology of low stringiness and thickener, which is applied in the direction of pharmaceutical active ingredients, medical preparations, toilet preparations, etc., can solve the problems of poor spreadability, inability to separate properties, and high demand for synthetic polymer compounds, so as to improve the stringiness, sliminess, and stickiness. , the effect of improving the stringiness

Inactive Publication Date: 2016-09-01
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a less stringy thickener that can be used in cosmetics to reduce stringiness, sliminess, stickiness, and improve spreadability. This results in improved cosmetics that are more comfortable and easy to apply.

Problems solved by technology

Among them, natural polymer compounds have issues such as supply stability and quality stability (lot-dependent viscosity variation, contamination by microorganisms, etc.); thus the demand for synthetic polymer compounds is becoming high in recent years.
The stringiness property can be a cause of sliminess, stickiness, and poor spreadability; therefore, it is a property that we normally want to eliminate from cosmetic raw materials.
Thus, the property is considered to be not necessarily separable from the thickening effect exerted by polymer compounds.
However, these methods lack versatility, and it is difficult to say that they are effective methods even for synthetic polymer compounds, which are used frequently in cosmetics.
However, the stringiness property is very strong; thus the blending quantity is restricted.

Method used

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  • Low-Stringiness Thickener and Cosmetic Material Admixed with Said Thickner
  • Low-Stringiness Thickener and Cosmetic Material Admixed with Said Thickner

Examples

Experimental program
Comparison scheme
Effect test

example 1

Precision Synthesis of Sodium Polyacrylate and Sodium PAMPS

[0035]By the RAFT polymerization method, which is a living radical polymerization, six kinds of sodium polyacrylate with different weight-average molecular weights and four kinds of sodium PAMPS with different weight-average molecular weights were precision-synthesized. Detailed procedures are shown below. In the below-described synthesis reactions, 4,4′-azobis-(4-cyanovaleric acid) (V-501, manufactured by Wako Pure Chemical Industries, Ltd.) was used as the polymerization initiator, and 4-cyanopentanoic acid dithiobenzoate (synthesized according to NPL 1, hereinafter abbreviated as CPD) was used as the chain transfer agent. As the chain transfer agent, α-(methyltrithiocarbonate)-S-phenylacetic acid (synthesized according to NPL 2, normally abbreviated as MTPA) may also be used.

[0036]Acrylic acid (2511 mg) and V-501 (0.17 mg) were dissolved in ion-exchanged water (9 mL), a methanol solution (1 mL) in which CPD (0.17 mg) had ...

example 2

Molecular Weight Distribution of Precision-Synthesized Sodium Polyacrylate and Sodium PAMPS

[0048]The elution peak obtained in the GPC analysis of the above-described precision-synthesized sodium polyacrylate-2 (GPC analysis chart) is shown in FIG. 1. The weight-average molecular weight is 6.33×106, and the number-average molecular weight is 4.376×106; therefore, the molecular weight distribution (weight-average molecular weight / number-average molecular weight) is 1.4. Accordingly, the precision-synthesized sodium polyacrylate-2 synthesized by the method of the present invention is seen to be a uniform molecular weight compound.

[0049]In the following, the above-described GPC analysis chart was divided into six regions for the respective compounds having the below-described molecular weights (FIG. 1), and the area percentages of the respective regions were determined. The results are shown in Table 1.

Region 1: compound whose molecular weight is three times or higher of the weight-aver...

example 3

Evaluation of Stringiness Property and Usability

[0061]In the following, the stringiness property and usability are evaluated, for the above-described polymer compounds, according to the methods explained below.

[0062]One mass % solution of each polymer compound was prepared and placed in a container at room temperature. The container was set on a texture analyzer (TA.XT Plus, manufactured by Stable Micro Systems), a round disk with the diameter of about 1 cm was uniformly and lightly contacted on the surface of the above-described solution, and the stringiness behavior of the solution was observed by letting down the container at the velocity of 5 mm / sec. The distance that the container descended, until the cut of the stringiness solution, was measured as the “stringiness length”. This stringiness length is the indicator of the stringiness property of polymer compounds, and “the larger the value, the stronger the stringiness property” (PTL 5). In this application, when the stringines...

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Abstract

The present invention was aimed to provide a low-stringiness thickener consisting of a compound in high demand as a thickener for cosmetics, i.e., polyacrylic acid or a salt thereof, or PAMPS or a salt thereof, where a stringiness property of the compound was reduced.A low-stringiness thickener consisting of a compound selected from polyacrylic acid. a salt of polyacrylic acid, PAMPS, and a salt of PAMPS, wherein the weight-average molecular weight of the compound is 500 thousand to 8 million, and wherein the content of the compound having the molecular weight of 10 million or higher is 10 mass % or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a less stringiness thickener suitable for cosmetics and a cosmetic admixed with the said thickeners.BACKGROUND ART[0002]Normally, various kinds of thickeners are blended in cosmetics for the realization of a viscosity suitable for use, the improvement in the feeling in use, and the stabilization of emulsion systems. Many of them are water-soluble polymer compounds and classified, depending upon their origins, into natural polymers (xanthan gum, hyaluronic acid, etc.), semi-synthetic polymers in which functional groups are added to natural polymers by synthesis reactions, and synthetic polymers. Among them, natural polymer compounds have issues such as supply stability and quality stability (lot-dependent viscosity variation, contamination by microorganisms, etc.); thus the demand for synthetic polymer compounds is becoming high in recent years.[0003]These polymer compounds are generally considered to exert a thickening effect by ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/81C08F8/44C08F120/58A61Q19/00
CPCA61K8/8147A61Q19/00C08F8/44A61K2800/10C08F120/58A61K2800/48A61K8/8158C08F120/06A61K8/8152
Inventor SOGABE, ATSUSHIMATSUO, AYANOYUSA, SHIN-ICHI
Owner SHISEIDO CO LTD
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