Water-in-Oil Sunscreen Emulsion for Moisture-Enhanced UV Protection
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Solution Overview
Problem
Existing water-in-oil emulsion cosmetics with ultraviolet protectants suffer from reduced protection effects when exposed to moisture and often have stickiness issues due to the use of oil phase thickeners.
Innovation Solution
Incorporating copolymers with silanol groups and oxypropylene or oxyethylene groups, or silylated peptides, along with ultraviolet protectants, enhances ultraviolet protection upon moisture contact and reduces stickiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil phase thickeners are blended into sunscreen cosmetics to improve ultraviolet protection performance after moisture contact, then the ultraviolet protection effects are enhanced, but the viscosity of the external phase is raised causing stickiness
Solution Approach 1:
The patent changes the chemical composition parameters of the cosmetic formulation by incorporating specific silicon compounds (polysilicone-29, dimethicone, phenyl trimethicone) with defined molecular weights and structures. This modifies the rheological properties of the external phase to achieve both high ultraviolet protection performance after moisture contact and reduced stickiness, resolving the contradiction between protection reliability and ease of operation.
Solution Approach 2:
The patent uses a composite formulation combining multiple silicon compounds with different properties (polysilicone-29 for film formation and protection enhancement, dimethicone for viscosity control, phenyl trimethicone for spreadability) along with ultraviolet protectants. This composite approach allows the external phase to simultaneously provide excellent ultraviolet protection after moisture exposure and maintain a non-sticky, pleasant feeling in use.
2Stability of the object's composition
If water-in-oil emulsion cosmetics are used to achieve water resistance, then the cosmetic coating film resists moisture, but ultraviolet protectants may still flow out and lower protection effects
Solution Approach 1:
The patent applies polysilicone-29 and other silicon compounds to the skin before ultraviolet exposure and moisture contact. These compounds form a protective film that pre-establishes a barrier structure, preventing ultraviolet protectants from flowing out when exposed to moisture. This preliminary film formation ensures both water resistance and maintained ultraviolet protection effects throughout the day.
Solution Approach 2:
The patent utilizes silicon compounds to create a flexible, breathable thin film on the skin surface. This film acts as a barrier that resists moisture penetration while allowing the ultraviolet protectants embedded within it to remain in place. The flexible nature of the silicon-based film prevents cracking and maintains integrity during skin movement, ensuring continuous ultraviolet protection.
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 formulation achieves improved ultraviolet protection after moisture exposure and provides a better user experience by minimizing stickiness, allowing for reduced oil phase thickener usage.
Implementation Method 1
blending a copolymer having silanol groups and oxypropylene groups (PO) or oxyethylene groups (EO)... contact with moisture such as water or perspiration increases the ultraviolet protection effects
Implementation Method 2
copolymer having silanol groups and oxypropylene groups (PO) or oxyethylene groups (EO)... ultraviolet protection effects are significantly improved upon contact with moisture
Implementation Method 3
blending... a silylated peptide into a water-in-oil emulsion skin cosmetic... the ultraviolet protection effects are significantly improved upon contact with moisture
Implementation Method 4
an excellent feeling in use is obtained... allowing a water-in-oil emulsion sunscreen cosmetic lacking stickiness and having an excellent feeling in use to be obtained
Data Source
AI summary
An objective of the invention is to provide a water-in-oil emulsion skin cosmetic having the property wherein contact with moisture, such as water or perspiration, increases the ultraviolet protection effects over those immediately after application, and also having an excellent feeling in use. The present invention relates to a water-in-oil emulsion skin cosmetic comprising (A) (a-1) a copolymer having silanol groups, and oxypropylene groups (PO) or oxyethylene groups (EO), and/or (a-2) a silylated peptide; and (B) an ultraviolet protectant.