Elastomer-Coated Inorganic Powder for Emulsion Cosmetics
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Solution Overview
Problem
Emulsion cosmetics containing treated inorganic powders often provide an unpleasant frictional feel and powdery sensation on the skin, while struggling to maintain natural finish and concealability.
Innovation Solution
Incorporating an inorganic powder coated with an elastomer comprising an amino group-containing silicone polymer and a carboxyl group-containing silicone or acrylamide polymer, with a specific molar ratio, to create a cosmetic with improved skin feel and concealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If treated inorganic powder is used to improve makeup longevity, then the ability to prevent makeup from coming off is improved, but frictional feel and unpleasant powdery sense occur on the skin
Solution Approach 1:
The invention changes the chemical parameters of the powder surface by coating with elastomer containing amino groups and carboxyl groups in a specific molar ratio (0.1 to 1.2), transforming the surface properties to reduce frictional feel and powdery sense while maintaining makeup longevity
Solution Approach 2:
The invention creates a composite structure by coating inorganic powder with elastomer formed from amino group-containing silicone polymer and carboxyl group-containing silicone or acrylamide polymer, combining the benefits of both materials to achieve improved skin feel and makeup durability
2Reliability
If inorganic powder is used to enhance concealability, then the cosmetic coverage is improved, but natural finish is compromised due to powdery appearance
Solution Approach 1:
The invention modifies the surface parameters of inorganic powder through elastomer coating with specific amino to carboxyl group ratio, changing the optical and tactile properties to maintain natural finish while preserving concealability
Solution Approach 2:
The invention applies elastomer coating specifically on the surface of inorganic powder particles, creating local quality differences where the coated surface provides natural finish while the underlying powder maintains concealability
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 elastomer-coated inorganic powder enhances the cosmetic's skin feel, providing a non-powdery, moistening sensation and excellent concealability while maintaining a natural finish.
Implementation Method 1
the elastomer comprises: (a1) an amino group-containing silicone polymer; and (a2) a carboxyl group-containing silicone polymer or a carboxyl group-containing acrylamide polymer
Data Source
AI summary
An elastomer improves the feel of inorganic powder on the skin. An emulsion cosmetic is characterized by containing: (A) 0.5-20 mass % of an inorganic powder having an elastomer coating layer containing (a1) and (a2); and (B) 20-80 mass % of an oil component. The elastomer is characterized by comprising: (a1) a silicone polymer having an amino group; and (a2) a carboxyl group-containing silicone polymer or a carboxyl group-containing acrylic polymer, wherein the molar ratio of the amino group to the carboxyl group, Y/X is in the range of 0.1-1.2 (Y is the molar amount of the carboxyl group contained in the component (a2), and X is the molar amount of the amino group contained in the component (a1)).