Polyester Elastomer With C–O–Si Linkages for Wash Resistance
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Solution Overview
Problem
Existing polysiloxane elastomers used in cosmetics lack sufficient organic content, compatibility with non-aqueous solvents, and durability, particularly in terms of hydrolytic stability and wash resistance.
Innovation Solution
Developing elastomers with a polyester backbone crosslinked through carbon-oxygen-silicon (C—O—Si) linkages, which are less hydrolytically stable than carbon-oxygen-carbon (C—O—C) linkages, to achieve similar sensory and thickening properties as polysiloxane elastomers while enhancing durability and compatibility with non-aqueous solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxane elastomers are used to provide thickening and sensory properties, then smooth feel and thickening are achieved, but hydrolytic stability is too high and durability is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by replacing the siloxane backbone with a polyester backbone and modifying the crosslinker structure. This parameter change reduces hydrolytic stability to improve degradability while maintaining durability through the specific C-O-Si linkage design between the polyester backbone and crosslinker
Solution Approach 2:
The patent creates a composite elastomer structure combining polyester backbone with siloxane-containing crosslinkers through C-O-Si linkages. This composite approach allows the material to exhibit both the desired sensory properties and improved durability/wash resistance while maintaining controlled hydrolytic stability
2Adaptability or versatility
If polysiloxane elastomers are used for thickening, then carrier fluid thickening is achieved, but compatibility with non-aqueous solvents is insufficient
Solution Approach 1:
The patent increases the organic content parameter by replacing the inorganic siloxane backbone with an organic polyester backbone. This parameter change enhances compatibility with non-aqueous solvents while maintaining the elastomer's thickening functionality and sensory properties
3Reliability
If C-O-C linkages are used for crosslinking, then hydrolytic stability is maintained, but wash resistance and durability are insufficient
Solution Approach 1:
The patent changes the linkage type parameter from C-O-C to C-O-Si between the polyester backbone and crosslinker. This parameter change reduces hydrolytic stability to enable better degradability and environmental compatibility while maintaining wash resistance through the elastomer's overall structure and crosslinking density
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 improved durability, compatibility with non-aqueous solvents, and enhanced sensory properties, such as a smooth, dry, powdery feel, while maintaining wash resistance.
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.