Durable Sunscreen Using Flaky Powder and Cationic Surfactant
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Solution Overview
Problem
Cosmetics tend to come off when exposed to water, clothes, or fingers, leading to decreased makeup effects such as ultraviolet blocking functions, and often result in an unpleasant texture or stickiness due to high concentrations of film-forming agents.
Innovation Solution
A cosmetic formulation incorporating a flaky powder and a specific cationic surfactant, along with an ultraviolet absorbing agent, to enhance the resistance of the coating layer to rubbing and maintain makeup effects without the need for high film-forming agent concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film-forming agent is blended into the cosmetic to enhance resistance to rubbing, then the resistance to friction is improved, but the filminess becomes strong and the texture becomes worse
Solution Approach 1:
The patent uses a specific flaky powder as an intermediary substance that mediates between the cosmetic formulation and the skin surface. This flaky powder forms a resistant coating without requiring high concentrations of film-forming agents, thus achieving friction resistance while maintaining pleasant texture and avoiding excessive filminess.
2Reliability
If a film-forming agent is blended into the cosmetic to enhance resistance to rubbing, then the resistance to friction is improved, but the cosmetic becomes not easily removable with normal cleanser
Solution Approach 1:
The patent changes the parameters of the coating formulation by using a specific flaky powder with controlled particle size, shape, and surface properties. This allows the coating to have sufficient friction resistance during wear but remains removable with normal cleansers, avoiding the need for special cleansing agents.
3Reliability
If a silicone resin or film-forming agent is added in high concentration, then the resistance to friction is improved, but the shininess and stickiness increase
Solution Approach 1:
The patent applies local quality by using a flaky powder with specific surface characteristics that provide friction resistance only where needed on the skin surface, while maintaining a natural, non-sticky appearance. The flaky structure creates resistance through physical interlocking rather than through sticky adhesion.
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 cosmetic exhibits strong resistance to friction with water, clothes, and fingers, maintaining ultraviolet blocking functions and providing an excellent texture and feel, with reduced shininess and stickiness.
Implementation Method 1
the resistance of the coating layer to rubbing is made stronger and the cosmetic coating film does not tend to come off
Implementation Method 2
blending a flaky powder and a specific cationic surfactant into a cosmetic
Implementation Method 3
6% to 40% by mass of an ultraviolet absorbing agent
Data Source
AI summary
The invention provides a cosmetic having strong resistance to contact with water, clothing, fingers, and abrasion with little decline (post-contact) in the cosmetic effects such as UV blocking protection as well as excellent feel on use. The cosmetic contains: (A) plate-shaped powder, (B) 6-40% by mass UV absorber, and (C) cationic surfactant.