Hydrocompatible Lipophilized Mineral Pigment Composition
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Solution Overview
Problem
Existing cosmetic pigment compositions face challenges with poor adhesion to the skin, tendency to run off, and difficulty in forming stable aqueous dispersions due to hydrophilic nature of metal oxide pigments and their hydrophobic coatings, which also lead to particle aggregation and negative sensorial properties.
Innovation Solution
A powder composition comprising composite particles with an inorganic core coated with a hydrophobic and a hydrophilic coating composition, where the hydrophilic coating comprises 20-60% hydroxypropylmethylcellulose, microcrystalline cellulose, and an inorganic filler, allowing for improved dispersibility in aqueous media and sebum resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface of metal oxide pigments is treated with hydrophobic compositions to improve adhesion to skin, then cosmetic durability is improved, but the particles tend to form aggregates and have poor dispersibility in aqueous media
Solution Approach 1:
The patent applies different surface treatments to different aspects of the particle functionality: the hydrophobic coating is applied to the surface to provide skin adhesion and cosmetic durability, while the bulk material maintains its hydrophilic character to enable aqueous dispersibility. This local differentiation of properties resolves the contradiction between durability and dispersibility.
Solution Approach 2:
The patent creates a composite structure where a hydrophobic coating layer is applied over hydrophilic metal oxide pigment particles. This composite material combines the adhesive properties of hydrophobic materials with the dispersibility of hydrophilic materials, simultaneously achieving both cosmetic durability and aqueous dispersibility.
2Reliability
If hydrophobic coatings are applied to pigment particles to prevent running off, then adhesion to skin is improved, but cleanability with water deteriorates
Solution Approach 1:
The hydrophobic coating is applied as a thin surface layer that provides sufficient adhesion for cosmetic durability while maintaining enough hydrophilic character in the overall particle system to allow water-based cleanability. The local hydrophobicity at the surface is balanced with bulk hydrophilicity.
Solution Approach 2:
Instead of completely coating the particles with hydrophobic material (excessive action), the patent uses a partial coating approach where the hydrophobic layer is sufficient to provide adhesion but not so thick as to completely prevent water interaction, thereby maintaining cleanability.
3Reliability
If hydrophobic coatings are used to improve durability, then cosmetic performance is enhanced, but the particles cannot be formulated in stable water dispersions
Solution Approach 1:
The patent creates particles with differentiated surface properties where the outer coating provides hydrophobic adhesion for durability while the inner bulk material maintains hydrophilicity for aqueous formulability, enabling the particles to be adapted to water-based cosmetic formulations.
Solution Approach 2:
The composite structure of hydrophobic coating over hydrophilic core creates a material that exhibits both hydrophobic and hydrophilic characteristics, allowing formulation in aqueous media while maintaining the durability benefits of hydrophobic coating.
4Reliability
If hydrophobic surface treatment is applied to prevent sebum interaction, then sebum resistance is improved, but particle aggregation increases
Solution Approach 1:
The hydrophobic coating provides local sebum resistance at the particle surface while the hydrophilic bulk material promotes inter-particle repulsion through water interaction, preventing aggregation. The local hydrophobicity protects against sebum while bulk hydrophilicity maintains dispersion stability.
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 solution enhances the cosmetic durability and sensorial properties of the pigment compositions by maintaining a dry feeling on the skin, reducing greasiness and sandiness, and allowing for stable aqueous dispersions without particle aggregation, thus improving user experience.
Implementation Method 1
the surface of the particles is treated so as to be more hydrophobe prior to their use by means of constituting a hydrophobic coating
Implementation Method 2
a powder composition comprising composite particles, that present an inorganic core, a hydrophobic coating composition and a hydrophilic coating composition
Data Source
AI summary
A powder composition including composite particles, wherein the composite particles present an inorganic core, a hydrophobic coating composition and a hydrophilic coating composition, wherein the hydrophilic coating composition includes microcrystalline cellulose and from 20% to 60% of hydroxypropylmethylcellulose in weight relative to the total weight of the hydrophilic composition. The invention further relates to a process for obtaining such powder composition as well as cosmetic compositions including the powder composition.