Patent ID: 8440387

Claim:
A composition, comprising: a mixture of a first polymer and a second polymer, said first polymer containing fluorine, said second polymer containing a pendent acid group, said second polymer different from said first polymer, a weight percentage of fluorine in said first polymer greater than a weight percentage of fluorine in said second polymer; a casting solvent, said first polymer and said second polymer soluble in said casting solvent; (i) said first polymer comprising a methacrylate first monomer that includes a —C(CF 3 ) 2 OH group or (ii) said first polymer comprising said first monomer and a second monomer that is —CH 2 CCH 3 COOH— or that includes a —CH 2 CCH 3 — repeat unit and a —CH(CF 3 ) 2 group, two —C(CF 3 ) 2 OH groups, a —SO 2 OH group or a —SO 2 CF 3 group or (iii) said first polymer comprising said first monomer, said second monomer and a third monomer having a —CH 2 CHCH 3 — repeat unit that includes a —SO 2 CF 3 group; wherein said first monomer, said second monomer and said third monomer are different from each other; and (iv) said second polymer comprising of a fourth monomer that is —CH 2 CCH 3 COOH— or includes a —CH 2 CCH 3 — repeat unit and a —C(CF 3 ) 2 OH group or a —SO 2 CF 3 group and a fifth monomer that is —CH 2 CHSO 2 OH— or that includes a —CH 2 CCH 3 — or CH 2 CH— repeat unit and a —SO 2 OH group or (vi) said second polymer comprising of said fourth monomer, said fifth monomer and a sixth monomer that is —CH 2 CH 3 COOCH 3 — or includes a —CH 2 CCH 3 — repeat unit and a cyclic hydrocarbon group or a cyclic alkyl alcohol group; wherein said second polymer miscible with said first polymer; and wherein said fourth monomer, said fifth monomer and said sixth monomer are different from each other.