| 摘要 |
<p>A polyethylene foam is prepared by heating normally solid aliphatic polyethylene at heat-plastifying temperatures between 90 DEG and 200 DEG C in admixture with from 0.02 to 0.31 gram molecular proportion of 1-chloro-1, 1,2,2-tetrafluoroethane or 1-chloro-1, 2,2,2-tetrafluoroethane per 100 grams of the polyethylene, under pressure to form a flowable gel and extruding the gel into a zone of lower pressure sufficient to expand the extruded gel.</p> |
