PROCESS FOR PREPAPRING POLYOLEFIN GEL ARTICLES, AS WELL AS FOR PREPARING HEREFROM ARTICLES HAVING A HIGH TENSILE STRENGTH AND MODULUS

摘要

Highly stretchable gel articles are prepared by contacting a shaped solvent-containing or solvent-free article of a high molecular weight polyolefin with a gaseous or liquid swelling agent at elevated temperature untill the swollen article contains 60-99 % (wt) of swelling agent, and cooling this article below the gelling temperature. The gel articles can be transformed into articles (filaments, tapes, films, tubes, bars) of high strength and modulus, by stretching at elevated temperature.