Patent ID: 8628855

Claim:
A perfluoropolyether polymer is represented by the general formula: wherein M FPE represents repeat units derived from one or more mono-(meth)acrylate monomers having a perfluoropolyether group, the monomer having a Mw of at least 600 g/mole, and the polymer comprises 10 to 50 wt-% of M FPE ; M AO represents repeat units derived from one or more (meth)acrylate monomers having an alkylene oxide repeat units; M MA represents units derived from (meth)acrylate monomers that lack a perfluoropolyether group and an alkylene oxide repeat unit; each X independently comprises an ethylenically unsaturated group; n and m each independently represent a value of 1 to 100 wherein the sum of n+m is at least 3; q represents a value of 0 to 100; and r and s each independently represent a value of 0 to 6 with the proviso that the sum of r+s is at least 1; wherein the M FPE units are bonded to the M AO units by means of polymerized (meth)acrylate linkages of a (meth)acrylate polymer backbone; and when q is 0, M AO is bonded to X by means of a urethane linkage and the polymer comprises M AO , M MA , or a combination thereof are bonded to X by means of a urethane linkage.