| 摘要 |
1,213,218. Polyolefin compositions. SUMITO CHEMICAL CO. Ltd. 14 June, 1968 [28 June, 1967], No. 28332/68. Heading C3P. Compositions comprise (1) 70 to 99.5 weight per cent of polyethylene of density not exceeding 0À94 and (2) 0À5 to 30 weight per cent of amorphous ethylene/propylene copolymer which amorphous polymer is the polymerization medium-soluble by-product in the manufacture of ethylene/propylene copolymers in the presence of a titanium halide/alkyl aluminium catalyst, has an ethylene content of 20 weight per cent or less, an intrinsic viscosity of 0À2 to 2À8 in tetralin at 135‹ C. and a crystallinity of less than 35 per cent, and contains 0À05 to 0À3 weight per cent ethylenic unsaturation. The compositions may be used for coating electrical conductors, and may be cross-linked by organic peroxides or irradiation. |
