| 摘要 |
1,172,629. Polyolefin compositions. DOW CHEMICAL CO. 15 Feb., 1967 [18 Feb., 1966], No. 7314/67. Heading C3P. Compositions comprise at least 40 volume per cent of irradiated olefin polymer and at least 40 volume per cent of finely divided metallic particles dispersed therein. Specified polymers are polyethylene, polypropylene, poly - 4 - methylpentene - 1, and copolymers of ethylene and propylene or butene- 1. Specified metals are aluminium, lead and iron. Carbon black may also be present. The compositions may be moulded to form cups, cones for electromagnets, machined parts, housings, decorative articles, gears, bearings and pulleys. Irradiation may be effected by a high energy electron or γ-ray source. Examples describe polyethylene irradiated and mixed with aluminium powder. |
