| 摘要 |
The invention disclosed herein provides a process for the high temperature extrusion of polyvinyl alcohol monofilament soluble in water comprising the steps of blending from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 91 percent with from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers, diols, triols and other polyols and mixtures thereof, reducing the moisture content of the resin to a level of less than about one percent and the volatile content thereof to a level of less than about two percent and, melt extruding the blend to form monofilaments. A novel high temperature extruded polyvinyl alcohol monofilament, soluble in water, comprises from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 91 percent and from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula <IMAGE> wherein R is hydrogen or methyl and R1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide the aforementioned average molecular weight, diols, triols and other polyols having from two to about 10 carbons including mixtures thereof.
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