Polyester-Silane Elastomer Crosslinks for Wash-Resistant Cosmetics
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Solution Overview
Problem
Existing polysiloxane elastomers used in cosmetics lack sufficient organic content, are not environmentally friendly due to high hydrolytic stability, and lack wash resistance, limiting their versatility and durability.
Innovation Solution
Developing elastomers with a polyester backbone crosslinked through carbon-oxygen-silicon linkages instead of carbon-oxygen-carbon linkages, which are less hydrolytically stable, to achieve similar sensory and thickening properties while enhancing durability and compatibility with non-aqueous solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polysiloxane elastomers are used to thicken carrier fluids and impart sensory properties, then smooth feel and thickening properties are achieved, but organic content is low and compatibility with non-aqueous solvents is limited
Solution Approach 1:
The invention uses a composite structure combining a polyester backbone with silane crosslinking groups. The polyester portion provides high organic content and compatibility with non-aqueous solvents, while the silane crosslinking provides the desired sensory properties and thickening capability. This composite approach allows the elastomer to achieve both high organic content (50-99% by weight) and functional performance.
2Object-affected harmful factors
If polysiloxane elastomers are used for cosmetic applications, then desirable sensory properties are achieved, but hydrolytic stability is too high and environmental friendliness is reduced
Solution Approach 1:
The invention extracts the silicon backbone from the elastomer structure, retaining only the silane crosslinking functionality. By using a polyester backbone instead of a polysiloxane backbone, the material maintains crosslinking capability and sensory properties while eliminating the highly stable Si-O-Si backbone that resists degradation. The C-O-Si crosslink bonds are less hydrolytically stable than C-O-C bonds, enabling environmental degradation.
3Reliability
If polysiloxane elastomers are used to thicken and provide sensory properties, then cosmetic performance is achieved, but wash resistance is insufficient
Solution Approach 1:
The invention changes the chemical parameters of the crosslink bonds from C-O-C to C-O-Si linkages. This parameter change increases the polarity and hydrogen bonding capability of the crosslinking points, enhancing interaction with water and improving wash resistance. The C-O-Si bonds provide stronger adhesion to skin and fabric surfaces, resulting in improved durability during washing while maintaining cosmetic performance.
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 new elastomers provide a smooth, dry, powdery feel with improved wash resistance and increased organic content, making them more versatile and environmentally friendly for cosmetic applications.
Implementation Method 1
crosslinking the backbone polymer with the crosslinker material by hydrosilylation addition between unsaturated carbon-carbon bonds of the backbone polymer and silylhydride groups of the crosslinker material to form an elastomer
Data Source
AI summary
A composition containing an elastomer, the elastomer characterized by having a polyester backbone crosslinked with a crosslinker and having a carbon-oxygen-silicon linkage between ester groups and crosslinkers.