Patent ID: 8536300

Claim:
A copolymer comprising repeating units of Formula 4, Formula 6, Formula 7 and Formula 8: wherein R 2 , R 2 ′, R 3 and R 3 ′ are independently selected from the group consisting of hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, alkanoyl, alkanoylamino, alkenoyl, alkynoyl, alkoxy, alkoxycarbonyl, alkoxycarbonylamino, alkylamino, alkylaminocarbonyl, dialkylaminocarbonyl, alkylsulfonyl, alkylsulfinyl, sulfonylaminoalkyl, alkylsulfonylaminocarbonyl, aminoalkyl, cyanoalkyl, halogen, haloalkyl, haloalkenyl, haloalkynyl, haloalkanoyl, haloalkenoyl, haloalkynoyl, haloalkoxy, haloalkoxycarbonyl, hydroxyalkyl, oxoalkyl, cycloalkyl, cycloalkenyl, cycloalkanoyl, cycloalkenoyl, cycloalkoxy, cycloalkoxycarbonyl, aryl, arylene, heterocycle, heterocyclyl, heteroaryl, heteroarylene, arylalkyl, heteroarylalkyl, arylalkanoyl, heteroarylalkanoyl, arylalkenoyl, heteroarylalkenoyl, arylalkynoyl, heteroarylalkynoyl, arylalkoxy, heteroarylalkoxy, aryloxy, heteroaryloxy, aryloxycarbonyl, heteroaryloxycarbonyl, arylalkoxycarbonyl, heteroarylalkoxycarbonyl, alkylhio, alkylthioalkyl, arylthio, arylsulfonyl and arylsulfinyl; or, R 2 and R 2 ′ or R 3 and R 3 ′ together form an alkylene or alkenylene chain completing a 3, 4, 5, 6, or 7-membered aromatic or alicyclic ring, and the ring optionally includes one or more divalent nitrogen, sulfur or oxygen atoms; and the substituents are substituted or unsubstituted; R 4 , and R 4 ′ are independently selected from the group consisting of hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, alkanoyl, alkanoylamino, alkenoyl, alkynoyl, alkoxy, alkoxycarbonyl, alkoxycarbonylamino, alkylamino, alkylaminocarbonyl, dialkylaminocarbonyl, alkylsulfonyl, alkylsulfinyl, sulfonylaminoalkyl, alkylsulfonylaminocarbonyl, aminoalkyl, cyanoalkyl, halogen, haloalkyl, haloalkenyl, haloalkynyl, haloalkanoyl, haloalkenoyl, haloalkynoyl, haloalkoxy, haloalkoxycarbonyl, hydroxyalkyl, oxoalkyl, cycloalkyl, cycloalkenyl, cycloalkanoyl, cycloalkenoyl, cycloalkoxy, cycloalkoxycarbonyl, aryl, arylene, heterocycle, heterocyclyl, heteroaryl, heteroarylene, arylalkyl, heteroarylalkyl, arylalkanoyl, heteroarylalkanoyl, arylalkenoyl, heteroarylalkenoyl, arylalkynoyl, heteroarylalkynoyl, arylalkoxy, heteroarylalkoxy, aryloxy, heteroaryloxy, aryloxycarbonyl, heteroaryloxycarbonyl, arylalkoxycarbonyl, heteroarylalkoxycarbonyl, alkylhio, alkylthioalkyl, arylthio, arylsulfonyl, arylsulfinyl, Y and L-Y, with a proviso that at least one of R 4 and R 4 ′ is Y or L-Y; X 2 is NH, N, O, S or P; Y is a photoreactive group; L is selected from the group consisting of alkylene, alkylene oxide, alkenylene, alkenylene oxide and alkynylene, which is unsubstituted or substituted with alkyl, alkoxy or a combination thereof; the ratio of the repeating unit of Formula 4 or Formula 6 and the repeating unit of Formula 7 is 1:0.1 to 1:0.5; the copolymer has a degree of polymerization of 100 to 1,000; the copolymer is doped with a polymeric acid of formula 8; and m′ is 100 to 1000.