Patent ID: 6803411
Filing Date: 2004-10-12
Classification: C08J

Abstract:
A method of producing a polyvinyl alcohol polymer film which comprises:contacting a polyvinyl alcohol polymer with a surface for drying (first drying surface) to obtain a polyvinyl alcohol polymer film, wherein the length of the first drying surface is within the range of 3 m to 200 m, and wherein the water content of the film when peeled after passing through the first drying surface ranges from 10% to 50% by weight, and contacting said polyvinyl alcohol polymer film with a second drying surface, wherein both sides of the polyvinyl alcohol polymer film are dried in two or more stages and one side of the film is dried by the first drying surface and the other side of the film is dried by the second drying surface, and wherein the length of said second drying surface is 1.2 times or less of the length of said first drying surface.