Polyhydroxyalkanoate Resin Particles for Odor and Squeakiness Control
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Solution Overview
Problem
Existing polyhydroxyalkanoate resin particles suffer from odor issues due to unsaturated fatty acid decomposition, poor biodegradability in water, squeaky texture, and inadequate dispersibility in topical preparations.
Innovation Solution
Developed polyhydroxyalkanoate-based resin particles with controlled unsaturated fatty acid, crotonic acid, and pentenoic acid levels, specific particle diameter, and moisture content, along with improved circularity and color tone, using emulsification and drying processes to enhance odor suppression, biodegradability, and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyhydroxyalkanoate resin particles are used as biodegradable alternatives, then environmental friendliness is improved, but odor issues arise due to unsaturated fatty acid decomposition
Solution Approach 1:
The patent applies parameter changes by precisely controlling the unsaturated fatty acid content to 10 mass ppm or less, crotonic acid content to 10 mass ppm or less, and pentenoic acid content to 60 mass ppm or less. These parameter specifications directly address the odor problem while maintaining biodegradability, resolving the contradiction between environmental friendliness and odor generation.
2Reliability
If polyhydroxyalkanoate resin particles are used, then biodegradability is improved, but squeaky texture and poor dispersibility occur
Solution Approach 1:
The patent employs parameter changes by specifying a volume average particle diameter of 1 μm or more and 40 μm or less, and moisture content of 0.2 mass% or more and 0.8 mass% or less. These parameter controls optimize both the texture (reducing squeakiness) and dispersibility in topical preparations while preserving biodegradability.
Data Source
AI summary
An object is to provide a polyhydroxyalkanoate-based resin particle in which an odor is suppressed. As a solution, the following (i) to (iii); (i) a polyhydroxyalkanoate-based resin particle in which a total remaining amount of an unsaturated fatty acid is 10 mass ppm or less, (ii) a polyhydroxyalkanoate-based resin particle in which a total remaining amount of crotonic acid is 10 mass ppm or less, and (iii) a polyhydroxyalkanoate-based resin particle in which a total remaining amount of a pentenoic acid is 60 mass ppm or less are provided.