Partially Hydrocarbon-Blocked Polysiloxane Viscosity and Oxidation
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Solution Overview
Problem
Conventional polyglycerol-modified polysiloxanes exhibit high viscosity, leading to impaired operation ability, and are prone to oxidation, resulting in the production of allergenic compounds like formaldehyde during storage, while polyether-modified polysiloxanes are also oxidizable and generate harmful compounds.
Innovation Solution
A partially hydrocarbon group-blocked (poly)glycerol-modified polysiloxane is developed, where terminal hydroxyl groups are partially alkylated, reducing viscosity and preventing oxidation, achieved through a hydrosilylation reaction that binds the polyglycerol moiety to the polysiloxane via an Si—C bond, thereby enhancing stability and reducing hydrolysis decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyglycerol is modified with polysiloxane using conventional methods, then the polysiloxane structure is formed, but the degree of polymerization of polyglycerol increases leading to extremely high viscosity and impaired operation ability
Solution Approach 1:
The patent controls the degree of polymerization of polyglycerol within a specific range (average degree of polymerization 2-10) and limits the content rate of polyglycerol to 1-50 mass% to reduce viscosity while maintaining polysiloxane structure. This parameter optimization resolves the contradiction between structural stability and operational ease.
2Ease of operation
If polyether-modified polysiloxane is used to reduce viscosity, then operation ability improves, but the compound is easily oxidized in air producing allergenic compounds like formaldehyde during storage
Solution Approach 1:
The patent replaces polyether modifiers with polyglycerol-modified polysiloxane that has controlled polymerization degree and hydroxyl content. The specific structural parameters (degree of polymerization 2-10, hydroxyl group content 1-50 mmol/g) provide both low viscosity for good operation and oxidation resistance for storage stability.
Solution Approach 2:
The patent creates a composite structure combining polysiloxane backbone with polyglycerol side chains, where the siloxane bonds provide oxidation resistance while the controlled polyglycerol content reduces viscosity. This composite approach resolves the contradiction between operational ease and storage reliability.
3Ease of operation
If polyglycerol content rate is increased to modify polysiloxane, then viscosity reduction is achieved, but the cosmetic composition shows increased hydrolysis reactivity and deteriorated quality over time
Solution Approach 1:
The patent optimizes the content rate of polyglycerol to 1-50 mass% and controls the hydroxyl group content within 1-50 mmol/g to balance viscosity reduction with hydrolysis resistance. This parameter control prevents excessive hydrolysis reactivity while maintaining operational viscosity.
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 polysiloxane has reduced viscosity, improved operational properties, and is resistant to oxidation, preventing the formation of harmful compounds, thus offering increased environmental compatibility and stability in cosmetic applications.
Implementation Method 1
terminal hydroxyl groups are partially alkylated
Implementation Method 2
achieved through a hydrosilylation reaction that binds the polyglycerol moiety to the polysiloxane via an Si—C bond
Implementation Method 3
is resistant to oxidation, preventing the formation of harmful compounds
Data Source
AI summary
The present invention provides a novel modified-polysiloxane, method for producing the same, and a cosmetic containing the same. The aforementioned modified-polysiloxane exhibits a reduced viscosity and superior operationability as compared with conventional polyoxyalkylene-modified polysiloxanes and polyglycerol-modified polysiloxanes. In addition, since the modified-polysiloxane is hardly oxidized in air, hardly produce allergenic compounds such as formates, and aldehydes such as formaldehyde, during storage over time, an increased environmental compatibility can be exhibited. In addition, the modified-polysiloxane of the present invention exhibits a reduced hydrolysis property and is stable. In the modified-polysiloxane of the present invention, the terminal hydroxyl groups of a polyglycerol-modified polysiloxane are partially blocked with hydrocarbon groups.