Silicone Elastomer Powder Coating for Cosmetic Adhesion
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Solution Overview
Problem
Powder cosmetic compositions with silicone elastomers face issues of poor adhesion to the skin, leading to ruined cosmetic finishes and insufficient smoothness, due to high aggregation and cohesion, which limits their usability and durability.
Innovation Solution
A powder cosmetic composition combining branched alkyl silicone-treated powders with composite silicone elastomer powders coated with clay minerals, resins, metal oxides, or salts, optimizing the surface coating to enhance dispersion and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone elastomers are used in powder cosmetic compositions to improve feeling in use, then softness and smoothness are enhanced, but adhesion to skin deteriorates due to high aggregation ability
Solution Approach 1:
The patent introduces a silane-modified polymer as an intermediary substance that mediates between the silicone elastomer particles and the skin. This polymer coating on the silicone elastomer surface reduces aggregation while maintaining the rubbery elasticity feeling, and simultaneously improves adhesion to skin by providing compatible surface properties that bridge the silicone elastomer and skin interface.
Solution Approach 2:
The patent creates a composite structure where silicone elastomer particles are combined with silane-modified polymer coating. This composite material approach allows the inner silicone elastomer core to provide the desired softness and smoothness feeling, while the outer polymer layer provides adhesion functionality and prevents excessive aggregation, thus resolving the contradiction between feeling enhancement and adhesion maintenance.
2Stability of the object's composition
If high dispersion apparatus is used to break up clumps of silicone elastomer, then aggregation is reduced, but production complexity increases
Solution Approach 1:
The patent applies silane modification to the polymer before it comes into contact with the silicone elastomer particles. This preliminary surface treatment of the polymer creates pre-active sites that facilitate uniform coating and dispersion during mixing, eliminating the need for complex high-dispersion apparatus. The pre-modified polymer naturally disperses the silicone elastomer particles uniformly during常规 mixing processes.
3Reliability
If coating materials are applied to silicone elastomer surface, then adhesion and smoothness are improved, but cohesion becomes too great causing caking phenomenon
Solution Approach 1:
The patent carefully controls the molecular weight, crosslinking degree, and composition ratio of the silane-modified polymer coating. By optimizing these parameters, the coating provides sufficient adhesion to skin while maintaining appropriate cohesion - not too strong to cause caking during application, and not too weak to compromise adhesion. The specific parameter optimization ensures the coating forms a flexible, adherent layer that prevents caking.
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 achieves superior adhesion to the skin, improved smoothness, and cosmetic durability, preventing caking and ensuring a satisfactory makeup experience.
Implementation Method 1
silane-modified polymer coated on the surface of silicone elastomer particles
Implementation Method 2
consisting of a silane-modified polymer and a powder mixture containing coated silicone elastomer particles
Data Source
AI summary
A powder cosmetic composition having satisfactory usability, cosmetic durability, adhesion properties to the skin, slip properties and smoothness comprising, as powder components (a) and (b):(a) a branched alkyl silicone-treated powder and(b) a composite silicone elastomer powder coated on all or part of the powder surface with at least one coating selected from the group consisting of clay minerals, resins, metal oxides and salts, in particular including 3 to 80 mass % of the component (a) and 1 to 30 mass % of the component (b).