Biodegradable Spherical Particles for Stable Cosmetic Texture
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Solution Overview
Problem
Existing biodegradable fine particles for cosmetics suffer from low sphericity, insufficient biodegradability, and rapid degradation, leading to changes in texture and feeling of use, which are undesirable for cosmetic compositions.
Innovation Solution
Biodegradable spherical particles with a narrow particle size distribution, controlled biodegradation rate, and high sphericity, formulated with biodegradable polymers such as polysaccharides and aliphatic polyesters, ensuring a slow and uniform degradation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable fine particles are used in cosmetic compositions, then environmental load is reduced, but the particles degrade rapidly causing changes in texture and feeling of use
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight, composition, and structure of biodegradable polymers to adjust the degradation rate. By selecting specific polymer types (polysaccharides, aliphatic polyesters) with controlled molecular weights and compositions, the invention achieves a balance between biodegradability and texture stability during the cosmetic product's shelf life and usage period.
2Shape
If fine particles with high sphericity are used, then good texture and light-scattering effect are achieved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent employs spheroidality by designing and producing particles with highly spherical shapes through controlled polymerization and processing methods. The invention achieves sphericity of 0.9 or higher by optimizing reaction conditions, using spherical molds, or controlling the phase separation process during particle formation, thereby achieving both good texture and manageable manufacturing precision.
3Productivity
If biodegradable polymers with fast degradation rate are used, then biodegradability is improved, but the feeling of use changes rapidly
Solution Approach 1:
The patent applies periodic action by designing polymers with controlled degradation kinetics that proceed at different rates at different time points. The invention achieves an initial slow degradation phase to maintain texture consistency during usage, followed by accelerated degradation after the product is discarded, thereby separating the functional period from the degradation period.
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 spherical particles maintain a favorable texture and prevent rapid degradation, providing a stable cosmetic experience without significant changes in feeling of use, while offering environmental benefits.
Implementation Method 1
the biodegradation degree on a fifth day in a biodegradability test in accordance with OECD TG301F
Data Source
AI summary
Biodegradable spherical particles contain a biodegradable polymer as a main component. The biodegradable spherical particles have a particle size variation coefficient CV of 40% or less, and a biodegradation degree on the fifth day in a biodegradability test in accordance with OECD TG301F of 40% or less. A cosmetic composition contains the biodegradable spherical particles. A method for producing the biodegradable spherical particles includes preparing a mixture by mixing a biodegradable polymer, a plasticizer, and a water-soluble polymer; melt-kneading the mixture at 200° C. or higher and 280° C. or lower to yield a kneaded product; and removing the water-soluble polymer from the kneaded product.