Crosslinkable Silicone Rubber Emulsion for Low-Irritancy Cosmetics

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Solution Overview

Problem

Existing cosmetic preparations containing silicone rubber emulsions face challenges due to the use of restricted substances and skin irritancy issues, with conventional methods being economically disadvantageous and unsuitable for cosmetic applications.

Innovation Solution

A crosslinkable silicone rubber emulsion is developed using a straight chain or branched organopolysiloxane prepared by ring-opening polymerization with citric acid, lactic acid, or ascorbic acid as a catalyst, and an anionic surfactant, specifically an N-acylamino acid salt or alkylphosphate salt, which is mixed with a reaction product of an amino group-containing organoxysilane and an acid anhydride.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional silicone rubber emulsions are used in cosmetic preparations, then film strength and water repellency are improved, but skin irritancy increases and restricted substances are used

Engineering Contradiction:

Improvefilm strengthVSAvoidskin irritancy

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the emulsion by using organopolysiloxane with terminal hydroxyl groups instead of conventional silicone rubber, and by using citric acid/lactic acid/ascorbic acid catalysts instead of strong acids. This parameter change maintains film strength while reducing skin irritancy and eliminating restricted substances

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses readily available, naturally occurring substances (citric acid, lactic acid, ascorbic acid as catalysts; N-acylamino acid salts and alkylphosphate salts as emulsifiers) that are safe for cosmetic applications, replacing expensive or harmful conventional materials while maintaining product performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If crosslinkable silicone rubber emulsion is used, then water resistance and comfort are improved, but production complexity increases

Engineering Contradiction:

Improvewater resistanceVSAvoidproduction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent incorporates crosslinkable functional groups (amino groups from amino group-containing organoxysilane) into the emulsion formulation in advance. This preliminary action enables the emulsion to crosslink and form a water-resistant film after application without requiring complex post-processing or additional production steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the functional parameters of the silicone rubber by introducing terminal hydroxyl groups and crosslinkable amino groups, enabling water resistance through crosslinking while maintaining simple production process using conventional emulsion polymerization techniques

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional emulsion polymerization methods are used, then production cost is reduced, but restricted substances and irritants are introduced

Engineering Contradiction:

Improveproduction costVSAvoidrestricted substances

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using safe, non-restricted catalysts (citric acid, lactic acid, ascorbic acid) and emulsifiers (N-acylamino acid salts, alkylphosphate salts) in the emulsion polymerization process, maintaining cost-effectiveness while eliminating restricted substances

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses inexpensive, readily available natural substances as catalysts and emulsifiers that are safe for cosmetic applications, replacing expensive or restricted materials while maintaining economical production

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The resulting cosmetic preparation exhibits reduced skin irritancy, higher water resistance, and improved comfort while avoiding restricted substances, maintaining performance comparable to conventional silicone rubber emulsions.

Implementation Method 1

a straight chain or branched organopolysiloxane containing at least two hydroxyl groups bonded to silicon atoms per molecule prepared by ring-opening polymerization of a cyclic organosiloxane

Methodology Applied

Scientific EffectRing-opening polymerization: Photopolymerisation

Implementation Method 2

Cosmetic preparation containing crosslinkable silicone rubber emulsion... Silicone emulsions capable of forming a film by crosslinking

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentUS10010497B2Cosmetic preparation containing crosslinkable silicone rubber emulsion and its production method

Publication Date: 2018.07.03 NISSHIN CHEM IND CO LTD

AI summary

A cosmetic preparation containing a crosslinkable silicone rubber emulsion comprising (A) 100 parts by weight of a straight chain or branched organopolysiloxane containing at least two hydroxyl groups bonded to the silicon atom per molecule prepared by ring-opening polymerization of a cyclic organosiloxane in the presence of an alkoxysilane or its partial hydrolytic condensate or an α,ω-dihydroxy or dialkoxy siloxane oligomer by using a catalyst selected from citric, lactic, and ascorbic acids and an anionic surfactant emulsifier; and (B) 0.5 to 20 parts by weight of a reaction product of an amino group-containing organoxysilane and an acid anhydride.