| 摘要 |
A block copolyester comprises a hard segment and a soft segment, wherein the glass transition temperature of the copolyester is less than -20 DEG C. The hard segment is preferably polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate. The soft segment is preferably formed from at least one dimer fatty acid and/or dimer fatty diol and/or equivalent thereof. The copolyester is especially suitable for use in automotive parts, particularly where thermal stability is required.
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