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Wrinkle-improving external preparation for skin

A skin external preparation and wrinkle technology, applied in the field of skin external preparations for improving wrinkles, can solve the problems of poor usability, poor use feeling, reduced wrinkle improvement effect, greasy feeling of skin film, etc., and achieves light feeling, excellent wrinkle improvement effect, The effect of increased film thickness

Active Publication Date: 2007-02-07
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using a film agent with strong shrinkage force, the following problems arise: due to the shrinkage of the film agent, the bonding force with the skin is weakened; due to the elasticity of the skin, it can be easily peeled off; in addition, the film is hard and feels strange during use; The film will break in a short time; the film will feel greasy, etc.
This reduces the wrinkle improvement effect and deteriorates usability and feeling of use.

Method used

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  • Wrinkle-improving external preparation for skin

Examples

Experimental program
Comparison scheme
Effect test

preparation example 2-1

[0167] Add 150g IPD, 120g PTMG (molecular weight 1000), 5g CHDM and 10gDMBA to a four-necked flask equipped with a stirring device, a thermometer, a nitrogen conduit and a reflux condenser, then add 50g ethyl acetate as a solvent, and heat to 80°C using an oil bath , and allowed to react for 6 hours to obtain a prepolymer in which isocyanate groups remained. The prepolymer with residual isocyanate groups was cooled to 50°C, then dispersed into 800g of water containing 6g of potassium hydroxide under high-speed stirring, and then carried out at 50°C for 3 hours for chain extension reaction to make it reach a high molecular weight. The aforementioned ethyl acetate was recovered from the obtained aqueous liquid to obtain a substantially solvent-free polyurethane aqueous dispersion (20% by mass of polyurethane solids).

[0168] (average particle size: 170nm, film strength: 410kg / cm 2 , film elongation: 320%, film shrinkage: 11%)

preparation example 2-2

[0170] Add 150g IPD, 60g PTMG (molecular weight 1000), 40g PHMC (molecular weight 2000) and 10g DMBA in the four-neck flask equipped with stirring device, thermometer, nitrogen conduit and reflux condenser, then add 50g ethyl acetate as solvent, use oil The bath was heated to 80°C and allowed to react for 3 hours. Then, 2 g of N-methyldiethanolamine (NMDEtA) and 40 g of ethyl acetate were added, followed by a reaction at 80° C. for 3 hours to obtain a prepolymer in which isocyanate groups remained. The prepolymer with residual isocyanate groups was cooled to 50°C, then dispersed in 700g of water containing 6g of potassium hydroxide under high-speed stirring, and then carried out at 50°C for 3 hours for chain extension reaction to make it reach a high molecular weight. The aforementioned ethyl acetate was recovered from the obtained aqueous liquid to obtain a substantially solvent-free polyurethane aqueous dispersion (20% by mass of polyurethane solids).

[0171](average parti...

preparation example 1-1

[0181] Synthesis of Polyurethane Aqueous Dispersion

[0182] Add 150g IPD, 120g PTMG (molecular weight 1000), 5g CHDM and 10gDMBA to a four-necked flask equipped with a stirring device, a thermometer, a nitrogen conduit and a reflux condenser, then add 50g ethyl acetate as a solvent, and heat to 80°C using an oil bath , and allowed to react for 6 hours to obtain a prepolymer in which isocyanate groups remained. The prepolymer with residual isocyanate groups was cooled to 50°C, then dispersed into 800g of water containing 6g of potassium hydroxide under high-speed stirring, and then carried out at 50°C for 3 hours for chain extension reaction to make it reach a high molecular weight. The aforementioned ethyl acetate was recovered from the obtained aqueous liquid to obtain a substantially solvent-free polyurethane aqueous dispersion (20% by mass of polyurethane solids).

[0183] (average particle size: 170nm, film strength: 410kg / cm 2 , film elongation: 320%, film shrinkage: 1...

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Abstract

To provide a skin treatment composition for wrinkle reduction that is superior in terms of the wrinkle reduction effect, usability, and the sensation during use. A skin treatment composition having a water dispersion of a polymer in which a non-water soluble film-forming polymer is dispersed in water wherein the main ingredients of said film-forming polymer are polyurethane having a film shrinkage rate of 20% or less and an acrylic type polymer having a film shrinkage rate of 20% or less. Also, a skin treatment composition for wrinkle reduction comprising (a) a non-emulsification type cross-linked silicone, (b) a film forming polymer having a film shrinkage rate of 20% or less containing as a main ingredient a polyurethane having a film shrinkage rate of 20%, (c) a liquid oil component, and (d) water.

Description

technical field [0001] The present invention relates to an external preparation for skin for improving wrinkles. More specifically, it relates to a skin external preparation for improving wrinkles by a film formed during drying when the above skin external preparation is applied to the skin. Background technique [0002] In the past, skin film agents were used in skin external preparations to achieve the purpose of improving skin wrinkles. The application of the film agent utilizes the property of film shrinkage during the drying process of film formation, therefore, it is applied based on the following considerations: the small wrinkles of the skin are pulled apart by the film contraction force, and the feeling of tightness is enhanced, which can Temporarily removes small wrinkles. For this reason, the film agent should use a substance that has a strong contraction force and forms a hard film. [0003] It is known that the coating agent mixed with the above-mentioned wri...

Claims

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Application Information

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IPC IPC(8): A61K8/87A61Q19/08C08L75/04C08G18/66A61K8/00A61K8/19A61K8/25A61K8/46A61K8/72A61K8/81A61Q19/00
Inventor 大村孝之渡边裕子
Owner SHISEIDO CO LTD
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