Patent ID: 8426550

Claim:
A polyamic acid, wherein the polyamic acid comprises a condensation reaction product of one or more acid anhydrides and one or more carbonate-based diamine compound represented by the following Chemical Formula 1: wherein, in the above Chemical Formula 1, X is a divalent aromatic group represented by the following Chemical Formula 1A or a substituted or unsubstituted divalent C5 to C30 alicyclic group, R 1 and R 2 are independently a C 1 to C 10 alkyl group, or a C 1 to C 10 fluoroalkyl group, and p and q independently range from 0 to 3, wherein, in the above Chemical Formula 1A, A is a single bond, CRR′ (wherein R and R′ are hydrogen, a C 1 to C 10 alkyl group, or a C 1 to C 10 fluoroalkyl group), SO 2 , O, or CO, each R 3 and R 4 is independently a C 1 to C 10 alkyl group, or a C 1 to C 10 fluoroalkyl group, and r and s independently range from 0 to 3.