NOVEL POLYIMIDE AND CIRCUIT SUBSTRATE COMPRISING THE SAME

摘要

The invention is a polyimide, random copolymer having repeating units of the formula (1): <CHEM> wherein R1 and R2 each represent a divalent group selected from <CHEM> and R1 and R2 may be the same or different; and x = 0.60 to 0.80, y + z = 0.40 to 0.20, and x + y + z = 1.00, and a linear expansion coefficient at 100 to 200 DEG C is in the range of from 10 to 20 ppm/K. This is a useful polyimide that can be a polyimide circuit substrate material capable of keeping flat, neither shrinking nor expanding in its laminate.