Patent ID: 8859689

Claim:
A composition comprising a first polymer and a second polymer, wherein the first polymer comprises at least one first monomer unit represented by Formula I, and at least one second monomer unit represented by Formula II: wherein R 1 is selected from the group consisting of hydrogen, C 1 -C 12 alkyl, and R 6 —COOR 7 , wherein R 6 is absent or C 1 -C 12 alkyl, R 7 is hydrogen or C 1 -C 12 alkyl; R 2 is C 1 -C 12 alkyl; R 3 , R 4 and R 5 are each independently selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, and cycloalkyl; and the second polymer comprises a recurring unit having a π-conjugated electron system.