| 摘要 |
<p>PCT No. PCT/FR90/00801 Sec. 371 Date Jul. 29, 1991 Sec. 102(e) Date Jul. 29, 1991 PCT Filed Nov. 8, 1990 PCT Pub. No. WO91/07447 PCT Pub. Date May 30, 1991.Polyolefin rubber which is an ethylene/propylene and/or 1-butene copolymer, which has a melt index of 0.3 to 15 dg/min and a relative density of 0.860 to 0.885, comprising 74-91 mol % of units derived from ethylene and 9-26 mol % of units derived from propylene and/or from 1-butene, characterised by a crystalline melting point J of 100 DEG to 125 DEG C. The process for obtaining this rubber consists in copolymerising, at a temperature of 150 DEG -300 DEG C. and at a pressure of 400-2000 bars, a gas stream containing 15-42% by vol. of ethylene and 58-85% by vol. of propylene and/or 1-butene, in the presence of a Ziegler-type catalyst system comprising at least one compound of a transition metal of groups IVB, VB, VIB and VIII of the Periodic Classification, and at least one organoaluminium compound and, if appropriate, in the presence of at least one chain transfer agent. Manufacture of articles such as seals, shoe components, flexible tubing, damping components, profiles for buildings and motor vehicles, and the like.</p> |
