| 摘要 |
Electrical wire and cable is provided with a layer of insulation or jacketing material which comprises a mixture of:… (1) a polyester based on tetramethylene terephthalate, preferably polytetramethylene terephthalate; and… (2) more than 40%, based on polymer (1), of a block copolymer preferably having polytetramethylene terephthalate hard blocks and poly(polytetramethylene oxide terephthalate soft blocks. …<??>Polymer (2) is a flex modulus of at least 69 MPa preferably at least 138 MPa. …<??>The insulation or jacketing material exhibits improved resistance to stress crazing in a number of solvents. |
