Cellulose Ester Microparticles for Biodegradable Microbead Replacement
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Solution Overview
Problem
Conventional plastic microbeads used in personal care and cosmetic products are not biodegradable and pose environmental concerns due to their small size and limited capture at water treatment facilities, leading to discharge into larger bodies of water, where they can be ingested by wildlife.
Innovation Solution
Production of biodegradable cellulose ester microparticles through milling processes to achieve a D50 particle size of 0.5 to 50 microns, ensuring high biodegradability and optical properties suitable for consumer products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic or polymeric microbeads are used in personal care and cosmetic products, then the products exhibit desired optical properties and tactile feel, but the microbeads are not biodegradable and pose environmental concerns
Solution Approach 1:
The patent changes the material composition parameter from plastic/polymer to cellulose ester, which fundamentally alters the biodegradability parameter while maintaining the optical and tactile properties required for personal care products. This material substitution resolves the contradiction between desired product performance and environmental harm.
Solution Approach 2:
The patent uses cellulose ester, a biodegradable material that can be formulated to provide the necessary optical properties and tactile feel similar to conventional plastic microbeads. This composite approach allows the maintenance of product functionality while eliminating environmental harm through biodegradability.
2Reliability
If conventional plastic microbeads are used, then consumer products meet aesthetic expectations, but the particles are not captured at water treatment facilities and discharge into larger bodies of water
Solution Approach 1:
The patent changes the material parameter from non-biodegradable plastic to biodegradable cellulose ester, which fundamentally alters the environmental fate of the particles. The biodegradable nature allows natural decomposition in water treatment systems, preventing discharge into larger water bodies while maintaining product performance.
3Object-affected harmful factors
If biodegradable materials are used to replace plastic microbeads, then environmental harm is reduced, but the particles may not meet consumer expectations for optical properties
Solution Approach 1:
The patent optimizes the cellulose ester composition and formulation parameters to achieve the desired optical properties such as light scattering, refractive index, and visual appearance. By carefully controlling these parameters, the biodegradable microbeads meet consumer expectations while maintaining environmental benefits.
Solution Approach 2:
The patent formulates cellulose ester microbeads as composite structures that incorporate additives and modifiers to enhance optical properties. This composite approach ensures that the biodegradable material achieves the aesthetic performance required for personal care and cosmetic products.
4Object-affected harmful factors
If cellulose ester microparticles are produced through milling processes, then biodegradability is achieved, but the production process requires specific equipment and procedures
Solution Approach 1:
The patent employs jet milling technology, which utilizes pneumatic principles to size-reduce cellulose ester particles. The jet mill uses high-velocity gas flow to impact and fragment particles, achieving the desired microparticle size distribution. This pneumatic approach provides a controlled and efficient production method for biodegradable microparticles.
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 cellulose ester microparticles provide enhanced solidity and tactile feel, making them indistinguishable from conventional microbeads, while offering high biodegradability and meeting consumer expectations for optical properties in personal care and cosmetic products.
Implementation Method 1
a jet mill for receiving and size-reducing the initial CE particles into CE microparticles
Implementation Method 2
milling the initial CE particles to thereby form CE microparticles
Implementation Method 3
a compressor for producing compressed gas
Data Source
AI summary
Systems and methods of producing cellulose ester (CE) microparticles are provided. The CE microparticles are produced by milling initial CE particles, having an average particle size of at least 75 microns, to a D50 particle size in the range of 0.5 to 50 microns. The produced microparticles are biodegradable, and have acceptable solidity and/or tactile feel to be used as an economical substitute for conventional plastic microbeads.