An unsaturated polyester compound having an ethylenically unsatureated group
in
its terminal and hydroxymethyl group in its side chain is obtained by the reaction
of (a) a compound containing at least two oxetane rings in its molecule with (b)
a compound containing at least two carboxyl groups in its molecule and (c) an unsaturated
monocarboxylic acid in the presence of a reaction promotor in such a proportion
that the ratio of said compound (b) to said compound (a) falls in the range of
0.1(b)/(a)1. BY further reacting (d) a polybasic acid anhydride with
the resultant unsaturated polyester compound (A), there is obtained an
actinic energy ray-curable resin which is soluble in an aqueous alkaline solution.
A photocurable and/or thermosetting composition is obtained by mixing the unsaturated
polyester compound (A) and/or the actinic energy ray-curable resin with
a polymerization initiator (B).
