Ethylene glycol copolymer polybutylene terephthalate composition and method for producing the same
The production of ethylene glycol copolymerized polybutylene terephthalate addresses variability in crystallization rates and moldability issues by utilizing residual ethylene glycol, resulting in improved molding efficiency and material properties.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- MITSUBISHI CHEM CORP
- Filing Date
- 2024-12-13
- Publication Date
- 2026-06-25
AI Technical Summary
Existing PBT compositions face issues with variability in material properties, moldability, and productivity due to inconsistent crystallization rates during injection molding, which are exacerbated by the need for additional processing steps to remove residual ethylene glycol (EG) after cleaning, leading to increased costs and reduced efficiency.
A method for producing ethylene glycol copolymerized polybutylene terephthalate (EG copolymer PBT) with controlled terminal hydroxyl group concentration and EG copolymerization amount, utilizing residual EG in the production process to eliminate the need for EG removal steps, thereby enhancing molding cycle characteristics and material properties.
The EG copolymer PBT composition exhibits improved molding cycle characteristics, fit and hinge properties, and is easily converted to high molecular weight, reducing processing steps and costs while maintaining excellent material stability and productivity.
Smart Images
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