Polysiloxane Elastomer with Polysaccharide Crosslinking
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Solution Overview
Problem
Polysiloxane elastomers used in cosmetics lack bio-renewable and bio-sourced components, are not wash-resistant, and often yellow due to platinum-based catalysts in hydrosilylation reactions, while also being incompatible with various organic solvents and prone to phase separation.
Innovation Solution
A polysiloxane-based elastomer is developed with a polysaccharide component linked through C—O—Si bonds, allowing it to form stable gels and pastes in various organic solvents, minimizing yellowing and enhancing wash resistance, using a hydrosilylation reaction with a platinum-based catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxane elastomers are used to thicken carrier fluids and impart sensory properties, then the cosmetic performance is improved, but the materials lack bio-renewable and bio-sourced components
Solution Approach 1:
The patent creates a composite elastomer material combining polysiloxane (providing thickening and sensory properties) with polysaccharide crosslinking agents (providing bio-renewable content). The polysaccharide component acts as a crosslinking agent that forms C-O-Si bonds with the polysiloxane backbone, creating a hybrid network structure that delivers both cosmetic performance and sustainability benefits.
2Ease of operation
If conventional polysiloxane elastomers are used, then smooth feel is achieved, but wash resistance is poor
Solution Approach 1:
The patent introduces localized crosslinking points within the polysiloxane chains using polysaccharide crosslinking agents. These crosslinks are distributed throughout the polymer structure at specific intervals, creating regions of enhanced stability that provide wash resistance while maintaining the overall flexibility and sensory properties of the elastomer.
3Productivity
If platinum-based catalysts are used in hydrosilylation reactions, then crosslinking efficiency is improved, but yellowing of the product occurs
Solution Approach 1:
The patent removes the platinum catalyst from the final product by using it only as a reaction catalyst during manufacturing. The catalyst facilitates the hydrosilylation crosslinking reaction between vinyl groups and Si-H groups, then is removed or deactivated, leaving behind a yellowing-free crosslinked network. This extracts the harmful catalytic residue while retaining the beneficial crosslinking efficiency.
4Adaptability or versatility
If polysiloxane elastomers are formulated with organic solvents, then compatibility is needed, but phase separation occurs
Solution Approach 1:
The patent performs preliminary crosslinking of the polysiloxane chains with polysaccharide agents before final formulation with organic solvents. This pre-formed crosslinked network structure provides stability that prevents phase separation when the elastomer is later combined with various organic solvent carrier fluids, ensuring long-term compositional stability.
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 polysiloxane-based elastomer provides a smooth, dry, powdery feel, is highly compatible with multiple solvents, and demonstrates improved wash durability and transparency, while maintaining minimal yellowing and environmental sustainability.
Implementation Method 1
The polysiloxane-based elastomer gels a variety of organic solvents and that can be formulated into a paste
Implementation Method 2
the polysiloxane component serving as a crosslinked component in the polysiloxane-based elastomer
Implementation Method 3
Polysiloxane elastomer materials have been desirable in the cosmetic industry to thicken carrier fluids
Implementation Method 4
the polysiloxane-based elastomer is made by a hydrosilylation reaction
Implementation Method 5
Hydrosilylation reactions typically use a platinum-based catalyst
Data Source
AI summary
A composition includes a crosslinked polysiloxane elastomer with 2 or more carbon-oxygen-silicon linkages between a polysaccharide component and polysiloxane component, where the polysaccharide component is other than a cellulose or starch component.