| 摘要 |
A polyimide-forming composition comprising (A) a polycarboxylic acid partial ester of formula HOOC - R<1> - COOR<2> I where R<1> denotes a divalent ethylenically unsaturated aliphatic or cycloaliphatic group of 2 to 20 carbon atoms, and R<2> denotes the residue, after removal of a hydroxyl group, of an alcohol having from 4 to 20 carbon atoms which has a cycloaliphatic, aromatic or heterocyclic ring and is polymerisable on heating in the presence of an acid, (B) a partial ester of romula I above in which R<1> denotes a group of formula II <CHEM> where Ar<1> denotes a tetravalent aromatic group of 6 to 20 carbon atoms linked through aromatic carbon atoms thereof to the indicated carbon atoms, and R<2> is as defined above, (C) an aromatic primary polyamine and (D) a heat-activable substance which releases an acid at a temperature of 100 DEG C or above. o |
