Cellulose Acetate Particles With Coatings to Prevent Coarse Feel
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Solution Overview
Problem
Existing cellulose acetate particles become coarse and hard after long-term storage due to high acyl substitution and low molecular weight erosion, compromising their softness and tactile sensation.
Innovation Solution
Cellulose acetate particles with a total degree of acyl substitution between 0.05 and 0.70, coated with materials like fatty acids, amino acid compounds, and an intermediate layer of polyamines, polysaccharides, or polyacrylic acids, maintaining softness and reducing coarse feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the total degree of acyl substitution of cellulose acetate is increased to improve softness, then the particles become coarse and hard after long-term storage
Solution Approach 1:
The patent optimizes the total degree of acyl substitution to a specific range (0.20-0.60) to balance softness and storage stability. This parameter optimization prevents the particles from becoming coarse and hard during long-term storage while maintaining adequate softness.
Solution Approach 2:
The patent uses composite cellulose acetate containing both acetyl groups and propionyl groups. This composite structure provides both softness and resistance to becoming coarse during storage, resolving the contradiction between initial softness and long-term texture stability.
2Stability of the object's composition
If the total degree of acyl substitution is decreased to maintain stability, then the softness of the particles is reduced
Solution Approach 1:
The patent sets the total degree of acyl substitution within the optimized range of 0.20-0.60, which is high enough to provide softness but controlled to prevent coarse feel during storage. This parameter balance resolves the contradiction between softness and stability.
Solution Approach 2:
The composite structure with specific proportions of acetyl and propionyl groups maintains both softness and stability. The propionyl groups contribute to stability while acetyl groups provide softness, achieving both desired properties simultaneously.
3Ease of operation
If cellulose acetate with high acyl substitution is used to improve tactile sensation, then molecular weight erosion occurs and particles become coarse
Solution Approach 1:
The patent employs composite cellulose acetate with both acetyl and propionyl groups. This composite structure maintains molecular weight stability during storage while providing good tactile sensation, preventing the particles from becoming coarse despite having sufficient acyl substitution for softness.
Solution Approach 2:
The patent optimizes the degree of substitution for both acetyl and propionyl groups to specific ranges that balance tactile sensation with molecular weight stability. This parameter control prevents excessive molecular weight erosion while maintaining adequate softness.
Data Source
AI summary
Cellulose acetate particles include cellulose acetate as a main component, in which a total degree of acyl substitution of the cellulose acetate is 0.05 or more and less than 0.70.