| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible wire excellent in heat resistance and thermal aging resistance by using a thermoplastic polyester elastomer of which crystal melting point and a Vicat softening temperature each satisfy a specific relationship, and of which degree of tensile ductility is.specific % or more. SOLUTION: This heat-resistant wire uses a polyester elastomer which satisfies relationships such as its crystal melting point: y deg.C>=200+0.5x and its Vicat softening temperature: z deg.C>=50+1.5x and of which degree of tensile ductility is 100% or more. The wire is excellent in stability and flexibility under severe environment. In the expressions, (x) is wt.% of a substantial hard segment with respect to the elastomer. Preferably, the elastomer wherein (x) is 30-50%, and which is constituted of repetition units expressed by formulas I-IV and has a reduction viscosity of 0.5-4.0 is used. In formulas I-IV, R is an aromatic group of C6-18, G is a polyoxyalkylene group having a molecular weight of 400-6000, D is hydrogenation dimerdiol or the like, R' is an alkylene group of C1-25, (a): 30-95 wt.%, b/(b+c):0.01-0.99, and (d): 0-20 mol%. |
