Powder Dispersion Composition for Cosmetics
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Solution Overview
Problem
Conventional sunscreen cosmetics with high SPF values often become coarse when a large amount of powder-like ultraviolet filters are mixed in, making it difficult to achieve a fresh, easy-to-spread texture and reducing skin comfort.
Innovation Solution
A powder dispersion composition is developed with an average particle size 10 times or less than the primary particle size, a polydispersity index of 0.4 or less, and an absorbance per 1% of 150 or more, using a silicone oil with an HLB of 2 or less and a glycerol-modified silicone dispersant, and is prepared by mixing an oil phase and powder with cavitation homogenization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of powder like ultraviolet filter is mixed in a sunscreen cosmetic to achieve high SPF value, then the ultraviolet protection performance is improved, but the cosmetic becomes coarse and the burden on the skin increases
Solution Approach 1:
The patent applies segmentation by dividing the powder particles into much finer sizes through advanced dispersion techniques. The powder is broken down into primary particles with sizes of 1 µm or less, and the average particle size is controlled to be 10 times or less the primary particle size. This segmentation allows sufficient UV protection with reduced total powder amount, eliminating the coarse texture while maintaining high SPF values.
Solution Approach 2:
The patent changes the particle size parameter dramatically, achieving an average particle size that is 10 times or less the primary particle size (which is 1 µm or less). It also controls the polydispersity index to 0.4 or less to ensure uniform fine distribution. These parameter changes enable high UV protection with minimal powder loading, resolving the contradiction between protection performance and cosmetic feel.
2Reliability
If powder such as ultraviolet filter is mixed in cosmetic to achieve high SPF value, then the ultraviolet absorption is improved, but the amount of powder required creates a coarse texture and reduces freshness
Solution Approach 1:
The patent segments the ultraviolet filter powder into ultra-fine primary particles (1 µm or less) and maintains them dispersed with an average particle size of 10 times or less the primary particle size. This extreme segmentation increases the surface area and UV absorption efficiency per unit mass, allowing high SPF values to be achieved with significantly reduced powder quantity, thus maintaining freshness and avoiding coarse texture.
Solution Approach 2:
The patent implements dramatic parameter changes in particle size (primary particle size of 1 µm or less, average particle size 10 times or less than primary), polydispersity index (0.4 or less), and absorbance per 1% powder (150 or more). These parameter transformations enable achieving high SPF with minimal powder amount, resolving the contradiction between UV protection and powder quantity.
3Ease of operation
If fine powder is dispersed to reduce burden on the skin, then the cosmetic feel is improved, but achieving high SPF values becomes difficult
Solution Approach 1:
The patent achieves the seemingly contradictory goals by implementing specific parameter thresholds: primary particle size of 1 µm or less, average particle size of 10 times or less the primary particle size, polydispersity index of 0.4 or less, and absorbance per 1% powder of 150 or more. These controlled parameters ensure both excellent cosmetic feel and high SPF values simultaneously.
Solution Approach 2:
The patent uses composite material approaches by combining ultraviolet filter powder with specific dispersants (silicone oil with HLB of 2 or less, and glycerol modified with silicone at both terminals) to create a stable dispersion system. This composite formulation maintains fine particle distribution while providing sufficient UV protection, achieving both good cosmetic feel and high SPF values.
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 effectively reduces the amount of powder mixed in cosmetics, enhancing skin comfort and maintaining high SPF values while providing a fresh, spreadable texture.
Implementation Method 1
homogenizing the mixture prepared in the first step based on the principle of cavitation
Data Source
AI summary
The object of the present invention is to provide a powder dispersion composition capable of giving high SPF values while maintaining feeling on use required for oil-in-water cosmetics, such as freshness and being easy to spread and reducing burden on the skin.A powder dispersion composition prepared by dispersing powder, wherein the powder has an average particle size of 10 times or less the primary particle size of the powder, the polydispersity index (PDI value) of the average particle size of the powder dispersion composition is 0.4 or less and the absorbance per 1% of the powder is 150 or more.