Sun Protection Compositions Using Polyurethane Mediators
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Solution Overview
Problem
Existing sun protection products with high SPF values are difficult to spread due to high filter substance content, often resulting in an unpleasant waxy, sticky skin feel, and are limited by legal restrictions on filter substance content, making it challenging to achieve both high SPF and good skin feel.
Innovation Solution
A sun protection composition using special polyurethanes obtained by reacting water-insoluble, isocyanate-functional polyurethane prepolymers with amino-functional compounds, containing 16-35% sun protection filter substances, with octocrylene at 4-12% by weight, which enhances the SPF without the need for high filter substance amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high content of sun protection filter substances is used to achieve high SPF, then SPF value is improved, but the composition becomes difficult to spread and leaves unpleasant waxy, sticky skin feel
Solution Approach 1:
The patent introduces polyurethane compounds as intermediary substances that interact with sun protection filter substances to improve their dispersion and reduce skin feel issues. The polyurethane acts as a mediator between the filter substances and the skin, enabling high SPF achievement without the unpleasant waxy, sticky feel associated with high filter content formulations.
Solution Approach 2:
The patent creates composite formulations combining polyurethane compounds with sun protection filter substances. This composite approach allows the polyurethane to modify the properties of the filter substances, improving spreadability and skin feel while maintaining high SPF values through synergistic effects.
2Reliability
If high content of sun protection filter substances is used to achieve high SPF, then SPF value is improved, but the skin feel becomes unpleasant and waxy
Solution Approach 1:
The polyurethane compound serves as an intermediary that reduces the harmful skin feel effects of high filter substance content. It interacts with the filter substances to improve their distribution and reduce the waxy, sticky perception on skin, while preserving the high SPF protective function.
Solution Approach 2:
The patent changes the physical and chemical parameters of the formulation by introducing polyurethane compounds with specific molecular weights and structures. This modifies the rheological properties and skin interaction characteristics of the filter substance mixture, transforming the unpleasant skin feel into a more acceptable texture while maintaining high SPF.
3Reliability
If legal restrictions on filter substance content are considered, then compliance is improved, but achieving high SPF becomes more difficult
Solution Approach 1:
The polyurethane compound acts as a multiplier that enhances the sun protection effectiveness of filter substances within legal content limits. By improving the performance efficiency of the filter substances through polyurethane interaction, the formulation achieves high SPF values without requiring excessive filter content that would violate legal restrictions.
Solution Approach 2:
The patent changes the effectiveness parameters of the filter substances through polyurethane interaction, allowing higher SPF achievement within lower filter substance content ranges. This parameter modification enables compliance with legal content restrictions while maintaining high protective performance.
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 a significantly higher SPF than the filter substances alone, providing a high SPF with a pleasant skin feel and reduced filter substance usage, addressing the limitations of previous products.
Implementation Method 1
polyurethanes which are formed from the polyaddition of 3-isocyanatomethyl 3,5,5-trimethylcyclohexyl-1-isocyanate and polyhydric alcohols, glycerides, hydroxy esters, silicone derivatives and/or amines
Implementation Method 2
The shorter-wave radiation in the UVB region (wavelength: 280-320 nm) reaches the uppermost skin layer. Rays in the UVB region cause sunburn and are responsible for an increased risk of skin cancer.
Data Source
AI summary
The invention relates to sun protection compositions for application on the skin, containing special polyurethanes and special sun filter combinations, and to the use of said polyurethanes and sun filter combinations for producing sun protection products.