| http://www.w3.org/ns/prov#value | - Preferable examples among them include the epoxy compound represented by the general formula ##STR4## wherein R1 is a hydrogen atom or an alkyl group having 1 to 20, preferably 1 to 15 carbon atoms, and R2 is an,alkyl group having 4 to 20, preferably 5 to 18 carbon atoms or a hydroxyalkyl group having 4 to 20, preferably 5 to 18 carbon atoms and at least one epoxy compound selected from the group
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