Mixed Cellulose Ester Microbeads for Biodegradable Optical Haze
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Solution Overview
Problem
Microbeads made from plastic or polymeric materials are not biodegradable and pose environmental concerns due to their persistence in water bodies, while consumer products require microbeads with certain optical properties for blending with skin tone and hiding blemishes.
Innovation Solution
Develop biodegradable microparticles composed of mixed cellulose esters with specific degrees of substitution for acetyl, propionyl, and hydroxyl substituents, achieving at least 50% biodegradability and a haze transmission of at least 10%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If plastic or polymeric microbeads are used, then optical properties for skin blending are achieved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the microbeads by using mixed cellulose esters with specific degrees of substitution (DSAc: 0.1-2.3, DSPr: 0.1-1.5, DSOH: 0.6-2.8) to achieve both desired optical properties and biodegradability. This parameter optimization allows the material to maintain skin-blending characteristics while enabling decomposition within 60 days.
Solution Approach 2:
The patent employs composite material structure by combining multiple cellulose ester components with different substitution levels to create a microbead that integrates both functional requirements. The mixed cellulose ester composition provides the necessary optical properties while maintaining biodegradability through the specific combination of acetyl, propionyl, and hydroxyl substituents.
2Object-affected harmful factors
If biodegradable materials are used, then environmental friendliness is improved, but optical properties for consumer products deteriorate
Solution Approach 1:
The patent optimizes the chemical parameters of cellulose esters by controlling the degree of substitution for different functional groups to achieve the right balance between biodegradability and optical properties. The specific ranges (DSAc: 0.1-2.3, DSPr: 0.1-1.5, DSOH: 0.6-2.8) ensure the material decomposes within 60 days while maintaining sufficient light transmission and skin-blending capabilities.
Solution Approach 2:
The patent applies local quality by having different regions or components of the microbead structure serve different functions - the cellulose ester composition provides biodegradability while specific substituent groups maintain optical properties. This allows the material to simultaneously meet environmental and consumer expectation standards.
3Ease of operation
If microbead size is reduced, then application performance is improved, but capture ability at water treatment facilities deteriorates
Solution Approach 1:
The patent changes the material parameters of the microbeads using mixed cellulose esters with specific substitution levels to achieve optimal size and density characteristics. This allows the microbeads to remain small enough for effective skin application while having sufficient mass or density to be captured by water treatment facilities, addressing the size-capture trade-off.
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 biodegradable microparticles exhibit enhanced optical properties, ensuring they meet consumer expectations and environmental standards by effectively breaking down within 60 days.
Implementation Method 1
the biodegradable microparticles exhibit at least 50 percent biodegradability at 60 days according to at least one of the OECD 301B, OECD 301C, or OECD 301 F test methods
Implementation Method 2
a haze transmission of at least 10 percent
Data Source
AI summary
Biodegradable microbeads exhibiting superior optical effects are provided. More particularly, biodegradable microparticles formed from biodegradable mixed cellulose esters are provided that exhibit superior optical effects, such as haze transmission, which are highly beneficial when used to produce cosmetic formulations. The produced microbeads also exhibit enhanced solidity, sphericity, and smoothness.