Patent ID: 6962955
Filing Date: 2005-11-08
Classification: C08F,C08J,Y10T

Abstract:
1. A polyvinyl alcohol having silyl group functionalized monomer units of formula (1): wherein R which is obtained by copolymerizing a vinyl ester monomer with a monomer having a silyl group of formula (2) to form a polyvinyl ester, and then hydrolyzing the polyvinyl ester, wherein R wherein the polyvinyl alcohol satisfies the following formulae (I) and (II): wherein P is the viscosity-average degree of polymerization of the polyvinyl alcohol; and S is the content (mol %) of the silyl group functionalized monomer units of formula (1) in the polyvinyl alcohol, wherein A is the silicon atom content of the polyvinyl alcohol in ppm; B is the silicon atom content of the polyvinyl alcohol in ppm after the polyvinyl alcohol has been first washed with a sodium hydroxide-containing methanol solution and then washed by Soxhlet extraction with methanol; and A and B are measured by ICP emission spectrometry of an ashed sample of the polyvinyl alcohol, and wherein an aqueous 4% solution of the polyvinyl alcohol has a pH of from 4 to 8.