To obtain the subject unsaturated group-bearing polycarboxylic acid resin that permits photographic development with a dilute aqueous alkali, and gives a resin composition that forms resist cured layers or the like having excellent flexibility, folding strength, adhesion, chemical resistance, heat resistance and flame retardancy by allowing a specific unsaturated group-bearing diol and a specific diol to react with acid anhydride group-bearing compounds.
The objective polycarboxylic acid resin is obtained by allowing (A) an unsaturated group-bearing diol prepared from (i) an epoxy resin bearing two epoxy groups in one molecule (for example, diglycidyl ether or the like) and (ii) an unsaturated group-bearing monocarboxylic acid [for example, (meth) acrylic acid] to react with (B) a diol of the formula ((n) is 1-15) (C) polyols other than the components A and B (for example, alkyl polyol or the like) and (E) a compound bearing two acid anhydride groups in one molecule (for example, pyromellitic dianhydride, preferably at 60-150°C.
MORI SATORU
KOYANAGI TAKAO
YOKOSHIMA MINORU
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