PURPOSE: To obtain the subject composition having excellent flexibility of film, attaining high resolution, comprising a polymer prepared by neutralizing a (meth)acrylic acid copolymer with a basic organic compound, a specific photopolymerizable unsaturated compound and a water-insoluble photoinitiator.
CONSTITUTION: The objective polymer comprises (A) a polymer prepared by neutralizing a polymer prepared by copolymerizing acrylic acid and/or methacrylic acid, having 20-300 acid value, with a basic organic compound, (B) a photopolymerizable unsaturated compound of the formula (R1 and R2 are H or methyl; k, m and n are ≥0, k+m is ≥1 and k+m+n is 2-15) and (C) a water-insoluble photoinitiator (e.g. benzophenone). The compound of the formula, for example, is obtained by introducing ethylene oxide into water, reacting in the presence of an alkali catalyst and dehydrating a formed dialcohol with (meth)acrylic acid.
UEHARA HIDEAKI
TACHIKI SHIGEO
KATO TAKURO
TSUKADA KATSUSHIGE
YAMAZAKI YUJI
YAMADA MASAHARU
SHIOTANI TOSHIHIKO
NAGASHIMA YOSHIHISA
HITACHI CHEMICAL CO LTD