Emulsion type release coating composition and pressure sensitive adhesive tape

摘要

An aqueous emulsion-type release coating composition comprising (i) a product produced by reaction of an ethylene-vinyl alcohol copolymer represented by the formula (1): <CHEM> wherein the sum of n, m and m' is an integer of 300 - 3,000, ratio of n/(n+m+m') is 0.1 - 0.9, and ratio of m/(m+m') is 0.9 - 1.0, with a C8-30 alkyl isocyanate, and (ii) a surface active agent which is a combination of a nonionic surface active agent having a hydrophilic-lyophilic balance (HLB) of not larger than 12, with an ionic surface active agent. The release coating composition is used as a release agent for a pressure sensitive adhesive tape or contact sheet.