Biomass-Derived Polyester Resin Composition for Solubility and Fluidity
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Solution Overview
Problem
Existing polyester resins lack balanced solvent solubility, pulverizability, storage stability at high temperature, and low-temperature fluidity, particularly when derived from biomass, and they do not effectively address environmental load reduction.
Innovation Solution
A polyester resin composition including structural units derived from biomass, such as erythritan, an aliphatic diol with 3 to 8 carbon atoms, and trivalent or higher-valent acid components, with specific ratios to enhance solvent solubility, storage stability, and low-temperature fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyester resin uses biomass-derived monomers (such as isosorbide or erythritan) to reduce environmental load, then environmental load is reduced, but solvent solubility becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by introducing structural unit (A) with specific glass transition temperature characteristics and controlling the ratio of structural unit (B) to achieve both environmental benefits and adequate solvent solubility. The specific parameter control of structural unit ratios allows the resin to maintain biomass-derived environmental advantages while achieving satisfactory solvent solubility through optimized composition.
Solution Approach 2:
The patent creates a composite polyester resin system combining multiple structural units: (A) from biomass monomers, (B) from aliphatic diols, and (C) from trivalent or higher-valent components. This composite approach allows the resin to integrate the environmental benefits of biomass-derived materials with the solvent solubility characteristics provided by the combination of different structural units, particularly units (B) and (C).
2Reliability
If polyester resin is designed for high storage stability at elevated temperatures, then storage stability improves, but low-temperature fluidity deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter through careful selection and ratio control of structural units. By controlling the content of structural unit (A) and the ratio of structural unit (B), the resin achieves an optimal balance where storage stability at elevated temperatures is maintained through appropriate Tg, while low-temperature fluidity is preserved through the flexible chain characteristics of the aliphatic diol units.
Solution Approach 2:
The patent introduces different structural units with distinct functional characteristics: structural unit (A) provides thermal stability through its rigid biomass-derived structure, while structural unit (B) from aliphatic diols provides flexibility and low-temperature fluidity. This local differentiation of structural units within the polymer chain allows simultaneous achievement of high storage stability and good low-temperature processability.
3Ease of manufacture
If polyester resin is designed for good pulverizability, then pulverizability improves, but solvent solubility deteriorates
Solution Approach 1:
The patent employs a composite structure with multiple structural units where unit (B) from aliphatic diols contributes to pulverizability through its flexible chains that facilitate particle formation and dispersion, while unit (C) from trivalent or higher-valent components provides crosslinking density that enhances solvent interaction. This composite approach allows the resin to achieve both good pulverizability and satisfactory solvent solubility.
Solution Approach 2:
The patent controls the ratio parameter of structural unit (B) to optimize pulverizability while maintaining solvent solubility through the balanced composition. By adjusting the amount of flexible aliphatic diol units relative to other components, the resin achieves optimal particle formation characteristics without excessive crystallinity that would harm solvent solubility.
Data Source
AI summary
A polyester resin including: structural unit (A) represented by a specific formula; structural unit (B) derived from an aliphatic diol having 3 to 8 carbon atoms (provided that the structural unit (A) is excluded); and at least one structural unit (C) selected from the group consisting of structural unit (c1) derived from a trivalent or higher-valent acid component and structural unit (c2) derived from a trihydric or higher-hydric alcohol component, the polyester resin including the structural unit (B) in an amount of 20 molar parts or more with respect to 100 molar parts of all the structural units derived from acid components.