Patent ID: 8821617

Claim:
A polyimide-polybenzoxazole (PBO-PI) copolymer having repeating units represented by Formula 1 below: wherein Ar 1 , Ar 2 ′ and Ar 3 ′ are identical or different, are each independently a bivalent C 5 -C 24 arylene group or a bivalent C 5 -C 24 heterocyclic ring which is substituted or unsubstituted with at least one substituent selected from the group consisting of C 1 -C 10 alkyl, C 1 -C 10 alkoxy, C 1 -C 10 haloalkyl and haloalkoxy, or two or more of which are fused together to form a condensation ring, or covalently bonded to each other via a functional group selected from the group consisting of O, S, C(═O), CH(OH), S(═O) 2 , Si(CH 3 ) 2 , (CH 2 ) p (in which 1≦p≦10), (CF 2 ) q (in which 1≦q≦10), C(CH 3 ) 2 , C(CF 3 ) 2 and C(═O)NH; Ar 2 and Ar 3 are identical or different, are each independently a trivalent C 5 -C 24 arylene group or a trivalent C 5 -C 24 heterocyclic ring which is substituted or unsubstituted with at least one substituent selected from the group consisting of C 1 -C 10 alkyl, C 1 -C 10 alkoxy, C 1 -C 10 haloalkyl and C 1 -C 10 haloalkoxy, or two or more of which are fused together to form a condensation ring, or covalently bonded to each other via a functional group selected from the group consisting of O, S, C(═O), CH(OH), S(═O) 2 , Si(CH 3 ) 2 , (CH 2 ) p (in which 1≦p≦10), (CF 2 ) q (in which 1≦q≦10), C(CH 3 ) 2 , C(CF 3 ) 2 and C(═O)NH; Q is O, S, C(═O), CH(OH), S(═O) 2 , Si(CH 3 ) 2 , (CH 2 ) p (in which 1≦p≦10), (CF 2 ) q (in which 1≦q≦10), C(CH 3 ) 2 , C(CF 3 ) 2 , C(═O)NH, C(CH 3 )(CF 3 ), or C 1 -C 6 alkyl-substituted phenyl or C 1 -C 6 haloalkyl-substituted phenyl in which Q is linked to opposite both phenyl rings in the position of m-m, m-p, p-m or p-p; m is an integer of 10 to 400; and n is an integer of 10 to 400.