Volatile Core Particle Actives for Evolving Opacity
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Solution Overview
Problem
Cosmetic compositions with high pigment loadings for skin lightening and opacity often result in poor tactile sensory and lose optical benefits quickly due to emulsion breakdown, leading to unnatural whiteness and inadequate long-lasting effects.
Innovation Solution
A cosmetic composition featuring particle actives with a silica shell and a volatile liquid core, where the silica shell has a refractive index of 1.3 to 1.8 and the core has a refractive index of at least 1.2, providing enhanced light scattering efficiency as the volatile liquid evaporates, thereby increasing opacity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high pigment and colorant content is used to achieve skin lightening and opacity benefits, then optical benefits are improved, but tactile sensory deteriorates and the composition feels unnatural
Solution Approach 1:
The patent changes the refractive index parameter of the particle core from conventional high values to at least 1.2, matching it closely with water (1.33). This parameter change allows the particles to provide optical benefits through light scattering while maintaining natural appearance and good tactile sensory, resolving the contradiction between optical performance and sensory comfort
Solution Approach 2:
The patent uses composite particle structure with a core-shell configuration where the core contains volatile liquid (water or aqueous phase) and the shell provides structural integrity. This composite structure enables the particles to deliver optical benefits through controlled light scattering while the volatile core evaporates to leave a natural finish, avoiding the unnatural feel associated with high pigment loadings
2Illumination intensity
If high loading of opacifying particles is used to compensate for optical benefit loss during drying, then opacity is maintained, but the composition produces unnatural whiteness on initial application
Solution Approach 1:
The patent changes the refractive index parameter of particle cores to at least 1.2, creating a gradual refractive index gradient from core to shell to surrounding medium. This parameter optimization allows effective light scattering for opacity while avoiding excessive white appearance, enabling natural aesthetics with reduced particle loading
Solution Approach 2:
The patent uses low concentrations of opacifying particles (0.001-10% wt) instead of high loadings, relying on the enhanced light scattering efficiency of the optimized particle structure. This partial action approach achieves sufficient opacity without the unnatural whiteness that results from excessive particle concentrations
3Illumination intensity
If emulsion structure is used to provide optical benefits, then initial opacity is achieved, but the benefits are lost quickly due to emulsion droplet coalescence and particle aggregation during drying
Solution Approach 1:
The patent changes the refractive index parameter of particle cores to at least 1.2, creating an optimized gradient that enhances light scattering efficiency. This allows effective optical benefits with lower particle concentrations that remain stable during drying, preventing aggregation and maintaining long-lasting effects
Solution Approach 2:
The patent employs composite particle structures with volatile liquid cores encapsulated in shells. During application, these particles provide optical benefits; during drying, the volatile core evaporates leaving behind a stable shell structure that maintains optical properties without aggregation, ensuring long-lasting effects
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 long-lasting and evolving optical benefits with improved skin appearance, maintaining opacity and lightening effects without the initial unnatural whiteness, while allowing for enhanced skin care benefits.
Implementation Method 1
the core component comprises volatile liquid... as the volatile liquid evaporates, thereby increasing opacity over time
Implementation Method 2
particles with a shell formed from an inorganic material with a certain refractive index and filled with a volatile material having a certain refractive index... providing enhanced light scattering efficiency
Data Source
AI summary
A cosmetic composition is disclosed comprising particle active; opacifying particles having a refractive index of at least1.7 and cosmetically acceptable carrier. The particle active comprises (i) water-insoluble shell component comprising inorganic material and having a refractive index of from 1.3 to 1.8; and (ii) core component comprising volatile liquid and having a refractive index of at least 1.2.