Ester group-containing tetracarboxylic acid dianhydride, polyester polyimide precursor, polyesterimide, and methods for producing same

摘要

A polyesterimide having a repeating unit expressed by formula (3) is useful for FPC substrates, COF substrates and TAB substrate materials, especially as FPC substrate materials:;
wherein R represents a phenyl group, R1 represents an alkyl group with 1 to 6 carbon atoms or alkoxy group with 1 to 6 carbon atoms, n each independently takes a value of 0 to 4, a each independently takes a value of 0 to 4, and m represents an integer of 2 to 4, where not all n's are 0 at the same time and 0≦n+a≦4 is satisfied by each phenylene group, and X is a divalent aromatic group and/or aliphatic group.

主权项

1. A polyesterimide precursor having a repeating unit expressed by General Formula (2): wherein R represents a phenyl group, R1 represents an alkyl group with 1 to 6 carbon atoms or alkoxy group with 1 to 6 carbon atoms, n each independently takes an integer of 0 to 4, m is an integer of 2 to 4, a each independently takes an integer of 0 to 4; where not all n's are 0 at the same time and 0≦n+a≦4 is satisfied by each phenylene group, and X represents a divalent aromatic group and/or aliphatic group and the ester group is bonded at the meta- or para-position relative to the amide bond.