Cage-shaped cyclopentanoic dianhydride, method for production thereof, and polyimide

摘要

A cage 1,2,3,4-cyclopentanetetracarboxylic acid (1,3:2,4)-dianhydride compound represented by formula [1], and a polyimide obtained by condensing the compound with a diamine. With the compound, it is possible to provide a polyimide which shows no absorption in the ultraviolet region and is highly transparent to light, has high insulating properties, has improved heat resistance and processability, and has excellent solubility in organic solvents.;
(In formula [1], R1 and R2 each independently represents a hydrogen atom, a halogen atom, or a C1-10 alkyl.)

主权项

1. A polyamic acid which contains the repeating unit represented by the formula [7] below in an amount of at least 10 mol % wherein A denotes a tetravalent organic group represented by the formula [8] and B denotes a divalent organic group and n is an integer wherein R1 and R2 independently denote a hydrogen atom, halogen atom, or C1-10 alkyl group; and a1 to a4 denote the positions for bonding with the carbon atom of the carbonyl group in the formula [7], provided that bonding with the carboxyl group does not take place simultaneously at a1 and a3 and bonding with the carboxyl group does not take place simultaneously at a2 and a4.