Crosslinked Ionic Silicone Network for Personal Care
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Solution Overview
Problem
Silicone copolymer gels in personal care applications lack wash-off resistance, pigment dispersibility, and anti-whitening properties, and the methods for generating crosslinked siloxane polymers are limited by the requirement for Si—H functional groups and terminal olefinic groups, restricting the incorporation of desirable organofunctional groups.
Innovation Solution
An ionically-modified cross-linked silicone network is formed through ring-opening polymerization of oxirane-functional compounds with hydride-functional silicone and a precious metal catalyst, optionally using a solvent, to create a gel that provides improved sensory benefits and performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone copolymer gels are used in personal care applications, then silky feel is provided, but wash-off resistance is insufficient
Solution Approach 1:
The patent uses a composite material system combining crosslinked siloxane polymer network with organofunctional groups (such as polyether, polyester, or carboxylic acid groups) to create a gel that provides both silky feel and wash-off resistance. The composite structure allows the siloxane network to provide sensory benefits while the organofunctional groups enhance adhesion and resistance to wash-off.
2Ease of operation
If silicone copolymer gels are used, then silky feel is achieved, but pigment dispersibility is poor
Solution Approach 1:
The patent incorporates organofunctional groups (such as polyether, polyester, or carboxylic acid groups) into the siloxane polymer network to create a composite material that provides both silky feel and improved pigment dispersibility. These functional groups enhance the gel's ability to disperse and stabilize pigments while maintaining sensory benefits.
3Strength
If conventional hydrosilylation method is used to generate crosslinked siloxane polymers, then crosslinked structure is formed, but range of organofunctional groups is limited
Solution Approach 1:
The patent changes the chemical parameters of the polymerization process by using ring-opening polymerization of oxirane-functional compounds instead of conventional hydrosilylation. This parameter change allows incorporation of diverse organofunctional groups (polyether, polyester, carboxylic acid, etc.) while maintaining crosslinked structure formation through the reaction of oxirane groups with silane crosslinking agents.
Solution Approach 2:
The patent creates composite materials by combining crosslinked siloxane polymer networks with various organofunctional groups through ring-opening polymerization. This approach allows the integration of multiple functional groups (polyether, polyester, carboxylic acid, etc.) into the polymer structure, expanding the range of desirable organofunctional groups beyond what is possible with conventional hydrosilylation methods.
4Ease of operation
If silicone copolymer gels are used, then initial silky feel is provided, but anti-whitening properties are insufficient
Solution Approach 1:
The patent uses composite materials combining crosslinked siloxane polymer network with organofunctional groups to provide both silky feel and anti-whitening properties. The organofunctional groups enhance the gel's performance by improving adhesion and preventing whitening effects, while the siloxane network maintains the desired sensory characteristics.
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 personal care composition exhibits a silky feel, enhanced wash-off resistance, improved pigment dispersibility, and anti-whitening properties, while maintaining stability and resistance to syneresis, even with prolonged aging.
Implementation Method 1
cross-polymers formed by the ring-opening polymerization of a oxirane-functional compound (silicone-non-silicone) in the presence of hydride-functional silicone, a precious metal catalyst
Implementation Method 2
an oxirane ring-opening polymerization catalyst
Implementation Method 3
hydride-functional silicone... crosslinked siloxane polymers... require the use of both Si—H functional groups and terminal olefinic groups to form crosslinked siloxane polymers
Implementation Method 4
a carrier solvent... shearing the crosslinked ionic silicone network during and/or after the polymerization step with at least carrier solvent (iii) to form the crosslinked ionic silicone network gel
Data Source
AI summary
The invention is directed to a personal care composition which contains a crosslinked ionic silicone network wherein the crosslinked ionic silicone network is formed by the ring-opening polymerization of oxirane moiety.