| 摘要 |
A thermoplastic elastomeric polymer mixture contains polypropylene, a copolymer of ethylene, propylene and optionally one or more polyunsaturated monomers, and an ethylene homopolymer or copolymer. The polymer mixture contains a mixture of: A. from 30 to 75 parts by weight of a crystalline, isotactic propylene homopolymer having a melt flow index of between 1 and 25 dg/min, and B. from 25 to 70 parts by weight of a rubber-like copolymer of ethylene, propylene and optionally one or more polyunsaturated monomers, which has a crystallinity of less than 10% by weight, an ethylene content of greater than 58% by weight, a tensile strength of greater than 30 kg/cm<2> and a Mooney viscosity (ML[1+4] 125 DEG C), as a measure of the molecular weight, of from 30 to 90, where C. a maximum of 15 parts by weight of the propylene homopolymer and at least sufficient parts as indicated by half the numerical value of the melt flow index of the propylene homopolymer are replaced by just as many parts by weight of an ethylene homopolymer or copolymer having a density of between 0.91 x 10<3> and 0.98 x 10<3> kg/m<3>. The polymer mixture is used for the production of automobile parts. |
