Sunscreen Copolymer and Voided Latex Particles for UV Boosting
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Solution Overview
Problem
Current sunscreen compositions containing inorganic metal oxide particles face challenges in providing high SPF while maintaining aesthetic qualities such as sensorial feel and visual appearance, as these particles often cause poor sensorial feel and an undesirable white appearance due to agglomeration and poor distribution on the skin.
Innovation Solution
Incorporating copolymer particles with phosphorus acid groups and voided latex particles, which enhance the UV blocking efficiency of inorganic metal oxides, improving both the SPF and aesthetic qualities of sunscreen compositions by forming a synergistic combination that exceeds the individual performance of each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic metal oxide particles are used for UV protection, then SPF is improved, but sensorial feel and visual appearance deteriorate due to agglomeration and poor distribution
Solution Approach 1:
The patent introduces copolymer particles containing phosphorus acid groups as intermediary substances that bind to inorganic metal oxide particles. These copolymer particles act as mediators that improve the distribution and dispersion of metal oxides on skin, preventing agglomeration while maintaining UV protection efficacy. The copolymer particles with specific functional groups facilitate better interaction between the inorganic particles and skin surface, thereby improving sensorial feel and visual appearance without sacrificing SPF
Solution Approach 2:
The patent creates a composite system combining copolymer particles containing phosphorus acid groups with inorganic metal oxide particles. This composite material approach allows the beneficial UV absorption properties of metal oxides to be maintained while the copolymer component provides improved distribution, reduced agglomeration, and enhanced aesthetic qualities. The composite structure enables simultaneous achievement of high SPF and good sensorial properties
2Reliability
If inorganic metal oxide particles are used for UV protection, then SPF is improved, but visual appearance deteriorates due to undesirable white appearance
Solution Approach 1:
The copolymer particles serve as intermediary agents that modify the optical properties of inorganic metal oxide particles on skin. By improving distribution and preventing dense agglomeration, the copolymer intermediaries reduce the scattering of visible light that causes white appearance, while maintaining the UV absorption capability of the metal oxides
Solution Approach 2:
The patent applies local quality improvement by ensuring uniform distribution of inorganic metal oxide particles through the copolymer mediation. This localized even distribution prevents areas of high concentration that would cause excessive white appearance, while maintaining sufficient UV protection coverage across the skin surface
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 combination of copolymer and voided latex particles significantly boosts the SPF of inorganic metal oxide particles, providing enhanced UV protection while improving the sensorial feel and visual appearance of sunscreen compositions, resulting in a more effective and cosmetically acceptable skin care product.
Implementation Method 1
Inorganic metal oxide particles, such as titanium dioxide and zinc oxide, provide absorption of UVA and UVB radiation
Implementation Method 2
both of which may be due to agglomeration of particles and poor distribution on skin
Data Source
AI summary
Provided are skin care compositions that are useful as SPF and UV absorption boosters in formulations containing inorganic metal oxides. The compositions comprise (a) (a) copolymer particles; (b) voided latex particles; (c) inorganic metal oxide particles; and (d) one or more dermatologically acceptable carriers. Also provided are methods of protecting skin from UVA and UVB damage comprising topically administering such compositions to the skin, and methods of boosting the SPF or UV absorption of a sunscreen composition containing inorganic metal oxide particles comprising including such copolymer particles and voided latex particles in the composition.