Bismuth Oxycarbonate UV Filter Eliminates Whitening
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Solution Overview
Problem
Existing sun protection compositions using inorganic UV-screening agents like titanium dioxide and zinc oxide cause a whitening effect on the skin, which is cosmetically undesirable, and can lead to unpleasant sensations such as roughness and dryness, especially at high concentrations.
Innovation Solution
The use of bismuth oxycarbonate particles with a specific empirical formula (BiO)2-x(CO3), where −0.4<x<0.6, and a greatest mean dimension less than 400 nm, particularly crystallized particles, for filtering ultraviolet radiation, especially UVB rays, while maintaining high transparency in the visible range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic UV-screening agents (titanium dioxide, zinc oxide) are used at high concentrations, then UV protection efficiency is improved, but whitening effect and unpleasant skin sensations (roughness, dryness) worsen
Solution Approach 1:
The patent changes the chemical composition parameter by replacing conventional inorganic UV-screening agents (titanium dioxide, zinc oxide) with bismuth oxycarbonate particles. This parameter change maintains UV protection efficiency while eliminating the whitening effect and unpleasant skin sensations associated with traditional mineral sunscreens
Solution Approach 2:
The patent employs bismuth oxycarbonate as a composite inorganic material that combines UV-screening capabilities with superior cosmetic properties. This composite material achieves both effective UV filtration and high transparency in the visible range, resolving the contradiction between protection efficiency and cosmetic acceptability
2Reliability
If inorganic UV-screening agents are used, then UV radiation filtration is improved, but transparency in visible range deteriorates
Solution Approach 1:
The patent changes the material composition parameter by using bismuth oxycarbonate particles instead of conventional titanium dioxide or zinc oxide. This parameter change enables the formulation to achieve both effective UV radiation filtration and high transparency in the visible light range, eliminating the grayish or whitening cast associated with traditional mineral sunscreens
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 bismuth oxycarbonate particles effectively filter UV radiation, particularly UVB rays, with high transparency in the visible range, providing efficient photoprotection without causing whitening or unpleasant skin sensations, thus meeting the cosmetic and protective requirements.
Implementation Method 1
bismuth oxycarbonate particles... for filtering ultraviolet radiation... effectively filter UV radiation, particularly UVB rays, with high transparency in the visible range
Data Source
AI summary
Use of bismuth oxycarbonate particles for filtering ultraviolet radiationThe present invention relates to the use of bismuth oxycarbonate particles having the empirical formula (BiO)2-x(CO3), wherein −0.4<x<0.6, for filtering ultraviolet radiation, the greatest mean dimension of said particles being less than 400 nm.It also relates to a composition comprising: i) bismuth oxycarbonate particles as defined above; ii) at least one aqueous phase and/or at least one fatty phase; and iii) at least one compound selected from: a) UV-screening agents other than the bismuth oxycarbonate particles i); b) colorants; c) cosmetic active agents for caring for keratin materials; d) surfactants; e) thickeners; and mixtures thereof.It also finally relates to a process for filtering UV radiation, comprising at least the application, to the keratin materials, of a cosmetic composition comprising bismuth oxycarbonate particles as defined above.