PROCESS FOR THE PREPARATION OF POLYVINYL ALCOHOL ARTICLES OF HIGH STRENGTH AND MODULES

摘要

Polyvinyl alcohol articles of high strength and modulus are obtained by thermoreversible gelation of a polyvinyl alcohol solution, extraction of the gelation solvent using a mixture of a lower alcohol or ketone and water, followed by high stretching. Preferably, a mixture of 5-80 vol.% of acetone and 95-20 vol.% of water is used as extractant. With this process extraction times of only 3-10 minutes are required.