| CPC C08G 73/1067 (2013.01) [C08G 73/1071 (2013.01); C08J 5/04 (2013.01); C08J 5/24 (2013.01); C08J 5/243 (2021.05); C08J 5/248 (2021.05); C08L 79/08 (2013.01); C09D 7/20 (2018.01); C09D 177/00 (2013.01); C09D 179/08 (2013.01); C08J 2379/08 (2013.01)] | 13 Claims |
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1. An amide acid oligomer represented by the following formula (1):
 where:
(I) n is an integer satisfying 1≤n≤100;
(II) Q represents a tetravalent residue derived from an aromatic tetracarboxylic acid (A), and contains a structural unit represented by the following general formula (2) and a structural unit represented by the following general formula (3) at a molar ratio of 80/20 to 20/80:
 (III) Y represents a divalent residue derived from an aromatic diamine (B), and contains a structural unit represented by the following general formula (4) and a structural unit represented by the following general formula (5) at a molar ratio of 100/0 to 20/80:
 where in formula (4), X1 represents a direct bond or a divalent linking group selected from the group consisting of an ether group, a carbonyl group, a sulfonyl group, a sulfide group, an amide group, an ester group, an isopropylidene group, an isopropylidene hexafluoride group, and 9,9-fluorenylidene group, and
(i) one of R1 to R5 represents one selected from the group consisting of an aryl group and a halogenated aryl group, another one of R1 to R5 represents a direct bond with a nitrogen atom in an amide bond with an acid anhydride component, the other three of R1 to R5 each independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, a halogenated alkyl group, a hydroxy group, a carboxyl group, and an alkoxy group, one of R6 to R10 represents a direct bond with a nitrogen atom in an amide bond with an acid anhydride component, and the other four of R6 to R10 each independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, a halogenated alkyl group, a hydroxy group, a carboxyl group, and an alkoxy group, or
(ii) one of R1 to R5 represents a direct bond with a nitrogen atom in an amide bond with an acid anhydride component, the other four of R1 to R5 each independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, a halogenated alkyl group, a hydroxy group, a carboxyl group, and an alkoxy group, one of R6 to R10 represents one selected from the group consisting of an aryl group and a halogenated aryl group, another one of R6 to R10 represents a direct bond with a nitrogen atom in an amide bond with an acid anhydride component, and the other three of R6 to R10 each independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, a halogenated alkyl group, a hydroxy group, a carboxyl group, and an alkoxy group; and
(IV) not less than 85 mol % and not more than 100 mol % of molecular terminals Z have structures each represented by the following formula (6) or (7), not more than 15 mol % and not less than 0 mol % of the molecular terminals Z are amine terminals each derived from an aromatic diamine component which is a raw material of the amide acid oligomer, not less than 50 mol % and not more than 100 mol % of the structures each represented by formula (6) or (7) are represented by formula (6), and not less than 0 mol % and less than 50 mol % of the structures each represented by formula (6) or (7) are represented by formula (7):
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