| 摘要 |
PURPOSE:To obtain the titled foam having high electrical conductivity and uniform, fine cells, by expanding an expandable polyolefin compsn, by heating it under atmospheric pressure while avoiding rapid expansion, and blending a specified amount of carbon particles. CONSTITUTION:10-30pts.wt. carbon particles and appropriate amounts of a blowing agent and a crosslinking agent are kneaded with 100pts.wt. polyolefin. The resultant crosslinkable, expandable compsn. is heated in a mold under pressure at a temp. at which the blowing agent is not substantially decomposed, to crosslink the compsn. The resultant crosslinked compsn. is expanded by heating it under atmospheric pressure while avoiding rapid expansion, to obtain the titled form. Pref. the heating is carried out in two stages wherein 15-85% of the blowing agent is decomposed in the first heating stage and the temp. is raised in the second heating stage. The crosslinking may be carried out not by heating, but by irradiation with electron beam. |
