Patent ID: 7074885

Claim:
A copolymer comprising at least one first monomeric unit and at least one second monomeric unit, wherein the at least one first monomeric unit has a Formulae Ia and the at least one second monomeric unit is selected from (i) aromatic groups having Formula II where: in each of Formulae Ia and II: R is a substituent on a carbon atom which can be the same or different at each occurrence and is selected from hydrogen, alkyl, aryl, heteroalkyl, heteroaryl, F, â€”CN, â€”OR 1 , â€”CO 2 R 1 , â€”C Ïˆ H Î¸ F Î» , â€”OC Ïˆ H Î¸ F Î» , â€”SR 1 , â€”N(R 1 ) 2 , â€”P(R 1 ) 2 , â€”SOR 1 , â€”SO 2 R 1 , â€”NO 2 , and beta-dicarbonyls having Formula XII adjacent R groups together can form a 5- or 6-membered cycloalkyl, aryl, or heteroaryl ring, such that: R 1 is a substituent on a heteroatom which can be the same or different at each occurrence and is selected from alkyl, aryl, heteroalkyl and heteroaryl; and Ïˆ is an integer between 1 and 20, and Î¸ and Î» are integers satisfying Equation A1 below: Î¸+Î»=2Ïˆ+1;â€ƒâ€ƒ(Equation A1); in each of Formula II: E can be the same or different at each occurrence and is a single bond or a linking group selected from arylene and heteroarylene and wherein, when R is a linear alkyl it is not n-hexyl.