Solid Sunscreen Composition Balancing Water Resistance and Cleansing
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Solution Overview
Problem
Existing sunscreen compositions struggle to balance water resistance and cleansing properties, with conventional formulations either failing to resist water and sweat or being difficult to remove completely, leading to skin irritation and usability issues.
Innovation Solution
A solid cosmetic composition containing high fatty acid content, specifically 5 to 40% by weight, which provides water resistance through hydrophobic nature and converts to surfactant properties for easy cleansing in high pH environments, combined with specific emulsifiers and waxes to maintain stability and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sunscreen formulations are used to achieve water resistance, then water resistance is improved, but cleansing properties deteriorate (difficult to remove completely)
Solution Approach 1:
The patent changes the chemical parameters of the formulation by incorporating specific fatty acid esters (isostearyl isostearate, cetyl palmitate) and fatty alcohols (isostearyl alcohol, cetyl alcohol) in optimized concentrations. These compositional parameter changes enable the sunscreen to maintain water resistance while being convertible to surfactant properties under high pH conditions, thus achieving both water resistance and ease of cleansing.
Solution Approach 2:
The patent uses a composite formulation combining multiple ingredients with complementary functions: fatty acid esters provide both water resistance and surfactant convertibility, fatty alcohols enhance water resistance and film formation, and UV filters provide sun protection. This composite material approach allows simultaneous achievement of water resistance and cleansing properties that individual components cannot achieve alone.
2Ease of operation
If solid cosmetic formulation is used to improve ease of use, then ease of operation is improved, but water resistance and cleansing properties become difficult to satisfy simultaneously
Solution Approach 1:
The solid formulation achieves versatility through parameter changes in the chemical composition, specifically using fatty acid esters that can transition from hydrophobic (water-resistant) state during application to surfactant (cleansing) state during removal with high pH water. This parameter-based adaptability allows the solid stick format to provide both water resistance and easy cleansing functionality.
Solution Approach 2:
The solid cosmetic formulation incorporates multi-functional ingredients that perform multiple roles: fatty acid esters provide water resistance, UV protection, and surfactant convertibility; fatty alcohols provide water resistance, film formation, and emolliency. This multi-functionality allows the solid formulation to simultaneously satisfy ease of use, water resistance, and cleansing properties.
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 excellent water resistance and cleansing properties, allowing effective UV ray blocking while being easily removable upon demand, with improved stability and usability.
Implementation Method 1
when exposed to water with a high pH, such as soapy water, the fatty acids undergo a saponification reaction and become having the properties of surfactants
Implementation Method 2
cosmetic composition for blocking ultraviolet radiation
Implementation Method 3
water resistance is imparted due to its hydrophobic nature when applied to the skin
Data Source
AI summary
The present invention provides a solid cosmetic composition which contains a UV-blocking agent, a fatty acid, and a wax, has excellent water resistance and/or cleansing properties, and can effectively block ultraviolet radiation. More specifically, a cosmetic composition for blocking ultraviolet radiation according to the present invention has excellent water resistance at low pH, and is converted to having excellent cleansing properties at high pH during the cleansing of skin, and thus can be effectively used.