Solid Zinc Oxide-Boron Nitride Cosmetic Composition for Coverage Stability
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Solution Overview
Problem
Solid anhydrous skin or lip care and makeup products using zinc oxide particles face issues with destructurization, impacting manufacturing feasibility and application/sensorial properties, necessitating a solution to maintain structural and sensorial qualities while providing equivalent coverage.
Innovation Solution
Incorporation of boron nitride particles alongside zinc oxide in a physiologically acceptable medium with waxes to form a solid cosmetic composition, ensuring mechanical and sensorial properties without titanium dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If zinc oxide particles are used to replace titanium dioxide, then coverage properties are maintained, but the solid composition structure is destructurized and mechanical properties deteriorate
Solution Approach 1:
The patent uses a composite powder mixture of zinc oxide particles (5-50 μm) and boron nitride particles (5-50 μm) in specific ratios (70-99% ZnO, 1-30% BN). This composite approach allows ZnO to provide coverage while BN maintains the solid composition structure, resolving the contradiction between coverage and mechanical strength.
2Illumination intensity
If zinc oxide particles are used to replace titanium dioxide, then coverage properties are maintained, but manufacturing feasibility and application properties deteriorate
Solution Approach 1:
The composite powder system of ZnO and BN particles enables manufacturing of solid compositions with consistent structure and properties. The BN component prevents destructurization during manufacturing processes while ZnO maintains coverage, making the product manufacturable and feasible for production.
3Illumination intensity
If zinc oxide particles are used to replace titanium dioxide, then coverage properties are maintained, but application and sensorial properties deteriorate
Solution Approach 1:
The ZnO-BN composite powder mixture restores application and sensorial properties in solid compositions. The BN particles contribute to smooth texture and comfortable application feel while ZnO provides coverage, enabling the product to glide smoothly and apply evenly on skin and lips.
Data Source
AI summary
The present invention relates to a cosmetic composition in solid form, preferably anhydrous, for caring for and/or making up keratin materials, in particular the skin, eyelids, eyebrows or lips, comprising, in a physiologically acceptable medium: (I) zinc oxide particles, (ii) boron nitride particles, and (iii) one or more waxes.