Patent ID: 6730464
Filing Date: 2004-05-04
Classification: C08F,C08L,C09D,G03C

Abstract:
A polyvinyl acetal resin for heat-developable photosensitive materialswhich is a polyvinyl acetal resin synthesized by the acetalization reaction between a polyvinyl alcohol and an aldehyde and which comprises having a degree of polymerization of 200 to 3,000, a residual acetyl group content of 0 to 25 mole percent and a residual hydroxyl group content of 17 to 35 mole percent, as calculated while regarding one acetal group as two acetalized hydroxyl groups, a water content of not more than 2.5% by weight and a residual aldehyde content of not more than 10 ppm and is free of any antioxidant.