Alkyl benzene tetracarboxylic dianhydride, manufacturing method thereof, polyimide, and application thereof

A 5-alkyl-1,2,3,4-benzenetetracarboxylic acid represented by the formula [2]

• (wherein R1 represents an alkyl group having 1 to 10 carbon atoms).

A method for producing a 5-alkyl-1,2,3,4-benzenetetra-carboxylic-1:2,3:4-dianhydride represented by the formula [1]

• (wherein R1 has the meaning as defined below), characterized by comprising hydrolyzing a tetraalkyl 5-alkyl-1,2,3,4-benzenetetracarboxylate represented by the formula [3]
• (wherein R1 and R2 independently represent an alkyl group having 1 to 10 carbon atoms) to obtain a 5-alkyl-1,2,3,4-benzenetetracarboxylic acid represented by the formula [2]
• (wherein R1 has the same meaning as defined above), and subsequently subjecting to dehydration and ring closure.

A method for producing a 5-alkyl-1,2,3,4-benzenetetra-carboxylic acid represented by the formula [2]

• (wherein R1 has the same meaning as defined below), characterized by comprising hydrolyzing a tetraalkyl 5-alkyl-1,2,3,4-benzenetetracarboxylate represented by the formula [3]
• (wherein R1 and R2 independently represent an alkyl group having 1 to 10 carbon atoms).

A polyamic acid containing at least 10 mol % of recurring units represented by the formula [6]

• (wherein R1 represents an alkyl group having 1 to 10 carbon atoms, R3 represents a divalent organic group, and n is an integer of 2 or over).

A polyimide containing at least 10 mole % of recurring units represented by the formula [7]

• (wherein R1 represents an alkyl group having 1 to 10 carbon atoms, R3 represents a divalent organic group, and n is an integer of 2 or over).