Modified Starch Fatty Acid Clay Complex for Cosmetic Stability
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Solution Overview
Problem
Cosmetic compositions containing clay often face issues of instability, leading to phase separation, and fail to provide a stable, long-lasting oil control effect on keratin substances like skin, as they may not rinse off completely, leaving behind a deposition that is insufficient for effective oil control.
Innovation Solution
A composition comprising modified starch, C13-C15 fatty acid, and kaolin clay, where the starch and fatty acid form a complex that coats the clay, enhancing its hydrophobicity and deposition on the skin, thereby ensuring stability and increased clay deposition for prolonged oil control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clay is used in cosmetic compositions for oil control, then clay deposition on skin is achieved, but the composition becomes unstable and undergoes phase separation
Solution Approach 1:
The patent introduces modified starch and C13-C15 fatty acid as intermediary substances that mediate between the hydrophilic clay particles and the hydrophobic skin surface. The modified starch undergoes hydrophobic modification to create an amphiphilic structure that can interact with both clay and skin, preventing phase separation while maintaining composition stability.
Solution Approach 2:
The patent creates a composite material system consisting of clay combined with modified starch and C13-C15 fatty acid. This composite structure integrates materials with different properties (hydrophilic clay, hydrophobic starch derivative, and fatty acid) to achieve both stability and effective skin deposition.
2Ease of operation
If clay composition is designed to rinse off completely, then cleanliness is improved, but clay deposition on skin becomes insufficient for effective oil control
Solution Approach 1:
The patent modifies the surface properties of starch through hydrophobic modification, changing its parameter from hydrophilic to amphiphilic. This parameter change allows the starch-modified clay to have different solubility characteristics, enabling it to rinse off partially while leaving sufficient deposition for oil control.
Solution Approach 2:
The patent creates local quality differences in the clay composition by using modified starch with hydrophobic groups that localize at the clay-skin interface. This local hydrophobicity enhancement at the particle surface allows the clay to adhere to the hydrophobic skin surface while maintaining overall composition 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 composition is stable, effectively rinses off while leaving a significant clay deposition on the skin, providing long-lasting oil control and a smooth skin feel by leveraging hydrophobic interactions between the clay and skin.
Implementation Method 1
The (a) modified starch may be hydrophobic... The (a) modified starch and the (b) C13-C15 fatty acid may form a complex... The (c) clay may be coated with the (a) modified starch and the (b) C13-C15 fatty acid, preferably a complex formed by the (a) modified starch and the (b) C13-C15 fatty acid
Data Source
AI summary
The present invention relates to a composition, comprising (a) at least one modified starch, (b) at least one C13-C15 fatty acid, and (c) at least one clay. The amount of each of the ingredients (a) to (c) may be within a specific weight range. The composition according to the present invention is stable, and can be rinsed off from the skin and can leave an enhanced deposition of clay on the skin after rinsing off the composition from the skin.