| 摘要 |
The thermoplastic composition of the main patent comprises a mixture of 20 to 70 parts by weight of crosslinked polynorbornene, from 80 to 30 parts by weight of a crystalline polyolefin which is an ethylene/alpha-olefin copolymer which has defined characteristics, and a quantity of plasticiser for polynorbornene which is sufficient to lower its glass transition temperature to the rubber range. According to this certificate of addition, up to 60 % by weight of the ethylene/ alpha-olefin copolymer is replaced with a polymer with a melt index (determined according to ASTM standard D 1238 at 230 DEG C under 2.16 kg) of between 0.3 and 10 dg/min, containing at least 80 mol% of units derived from propylene and not more than 20 mol% of units derived from a comonomer chosen from ethylene and alpha-olefins containing from 4 to 12 carbon atoms. Such compositions are employed for manufacturing finished products and industrial articles using extrusion, injection moulding and compression moulding techniques.
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