| 摘要 |
PURPOSE:To obtain a polyolefin foam having uniform, fine, closed cells and excellent heat resistance, by mixing PE or ethylene-based polymer, with a specified propylene-based polymer, and a specified PP or propylene-based polymer and crosslinking and foaming the mixture. CONSTITUTION:A mixture of (a) polyethylene and/or an ethylene copolymer, (b) a propylene copolymer A having a m.p. (a peak temperature of a differential colorimetric curve determined by a differential colorimeter or a differential scanning colorimeter, the same applies hereinafter) of 130-160 deg.C, (c) polypropylene and/or propylene copolymer B having a m.P. higher by at least 10 deg.C than that of the propylene compolymer A is mixed with (d) a blowing agent, (e) a crosslinking agent and/or a crosslinking accelerator, and the resulting mixture is crosslinked and foamed. Said propylene copolymer A is added for the purpose of improving tensile strength, vacuum formability, etc., and include those having a m.p. of 130-160 deg.C, such as ethylene/propylene random copolymers and ethylene/butene/propylene copolymers. |
