Patent ID: 7112639

Claim:
copolymer containing repeat units formed from both the monomer (I): wherein each R 1 , if present, is independently either hydrogen or a hydrocarbyl group; r is 0, 1 or 2; s is either 2 or 3; R 2–R 4 are each independently hydrogen or a hydrocarbyl group; and R 5 and R 6 are each independently either hydrocarbyl, halo or hydrogen; and the monomer (II): wherein P d 31 is the anion formed by loss of a proton from a proton donating group P d —H; Z is either a bond or a hydrocarbyl group; R 7 and R 8 are each independently hydrogen, a halo group or a hydrocarbyl group; and either (a) A is an electron accepting group, in which case. W is either hydrogen or a hydrocarbyl group, (b) W is an electron accepting group and A is either a bond or a hydrocarbyl group or (c) both A and W are electron accepting groups; wherein either: (a) the monomer (II) has the general formula (IX): in which B 1 is a bridging group of valency v, v is an integer from 2 to 8 and the groups —P d H may be wholly or partially present as the deprotonated analogues —P d 31 ; or (b) the monomer (I) has the formula (X): in which B 2 is a bridging group of valency a, and a is an integer from 2–8, or (c) both monomer (I) and (II) are selected from (IX) and (X) respectively, with the proviso that B 2 is not a phenyl or a substituted phenyl group or an alkylene group containing 2–8 carbon atoms.