Patent ID: 8679636

Claim:
A polymeric composition comprising at least one first divalent unit comprising a pendant perfluoropolyether or perfluoroalkyl group; at least one second divalent unit comprising a pendant phosphorus-containing acid group selected from (RO) 2 —P(O)—V—(O) n [C(R)—CH 2 ]—, (RO) 2 —P(O)—O—V—O—C(O)—[C(R)CH 2 ]—, or a combination thereof; wherein R is independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms; V is independently alkylene that is optionally interrupted by at least one ether linkage or amine linkage; n is 0 or 1; and at least one third unit comprising a terminal or pendant alkoxy silane group.