| 摘要 |
<p>A process for the preparation of a rigid polyolefin article comprising coextruding a polyolefin resin and a friction material resin comprising from 1 to 100 % by weight of a friction-increasing material and from 99 % to 0 % by weight of said polyolefin resin whereby to produce a polyolefin object having an external surface layer of said friction material resin on a substrate layer of said polyolefin resin, and if necessary forming said polyolefin object into said rigid article.</p> |
