Silicone Elastomer Dispersion Stabilization in Cosmetics
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Solution Overview
Problem
Current skin care products with silicone elastomers in water-based compositions face stability issues when used in high concentrations, leading to peeling and flaking, which limits their effectiveness in reducing the appearance of lines and wrinkles.
Innovation Solution
An aqueous dispersion of cured silicone rubber particles is combined with a specific emollient system, including cocoa butter, beeswax, and shea butter, to stabilize the composition and enhance skin smoothing and wrinkle reduction, using an in situ crosslinking reaction in an aqueous medium with a surfactant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicone elastomers are used in high concentrations in water-based compositions, then skin smoothening effects are enhanced, but the composition becomes unstable and exhibits peeling and flaking
Solution Approach 1:
The patent introduces a specific intermediary substance (polyethylene glycol distearate) that acts as a mediator between the hydrophobic silicone elastomer particles and the aqueous medium. This surfactant forms a stable interface that prevents aggregation and peeling of silicone particles, enabling high concentrations (above 30% by weight) to remain stable without flaking or separating.
Solution Approach 2:
The patent changes the chemical parameters of the aqueous medium by incorporating specific concentrations of polyethylene glycol distearate (0.1-10% by weight) and adjusting pH levels (5.0-7.0). These parameter modifications transform the aqueous medium's interfacial properties, allowing high concentrations of hydrophobic silicone elastomers to disperse uniformly and remain stable without peeling or flaking.
2Ease of operation
If silicone elastomers are dispersed in aqueous medium without suitable combination of ingredients, then water-based moisturizing benefits are provided, but uniform dispersability is difficult and benefits are diminished
Solution Approach 1:
The patent employs polyethylene glycol distearate as an intermediary surfactant that facilitates uniform dispersion of silicone elastomer particles in the aqueous medium. This mediator reduces interfacial tension and prevents particle aggregation, enabling uniform distribution even at high concentrations, thereby maximizing skin smoothening benefits while maintaining water-based moisturizing properties.
3Reliability
If silicone elastomers are used in aqueous medium without suitable combination of ingredients, then skin softening effects may be diminished due to hydrophobicity
Solution Approach 1:
The patent uses polyethylene glycol distearate as a surfactant intermediary that bridges the hydrophobic silicone elastomer and the hydrophilic aqueous medium. This mediator enhances the reliability of skin softening effects by ensuring uniform delivery and contact of silicone elastomers with the skin surface, overcoming the limitation of hydrophobicity in water-based formulations.
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 composition effectively stabilizes the silicone elastomer dispersion, allowing for higher concentrations, resulting in improved skin firmness, reduced appearance of lines and wrinkles, and maintaining cosmetic benefits without peeling or flaking.
Implementation Method 1
an aqueous medium containing a surfactant
Implementation Method 2
the in situ crosslinking reaction taking place in fine droplets of a liquid organopolysiloxane precursor for a silicone rubber
Data Source
AI summary
The present invention provides an anti-aging composition comprising more than 30% by weight of an aqueous dispersion of silicone elastomer and an emollient system and methods of use thereof for improving skin condition.