Patent ID: 8383694

Claim:
A free-radically polymerizable composition comprising a mixture of reaction products of i) at least one polyisocyanate; ii) at least one isocyanate reactive perfluoropolyether compound; iii) at least one isocyanate reactive compound comprising greater than 6 repeat units of ethylene oxide; and iv) at least one isocyanate reactive non-fluorinated crosslinker comprising at least two free-radically polymerizable groups; wherein the reaction product comprises a multifunctional perfluoropolyether urethane composition having the general formula Ri-(NHC(O)XQRf), —(NHC(O)OQ(A) p ), —(NHC(O)X(C 2 H 4 O) j R EO wherein Ri is a residue of a multi-isocyanate; X are each independently O, S or NR, where R is H or lower alkyl of 1 to 4 carbon atoms; Q is independently a straight chain, branched chain, or cyclic-containing connecting group having a valency at least 2; Rf is a monovalent perfluoropolyether moiety composed of groups comprising the formula F(RfcO)xCdF2d-, wherein each Rfc independently represents a fluorinated alkylene group having from 1 to 6 carbon atoms, each x independently represents an integer greater than or equal to 2, and wherein d is an integer from 1 to 6; A is a (meth)acryl functional group —XC(O)C(R2)=CH2, where R2 is a lower alkyl of 1 to 4 carbon atoms or H or F; p is 2 to 6; j ranges from 7 to 50; and R EO is H, a group selected from alkyl, aryl, alkaryl, aralkyl, that can optionally be substituted with a heteroatom, a heteoratom functional groups, or a (meth)acryl functional group; or —C(O)C(R 2 )═CH 2 where R 2 is a lower alkyl of 1 to 4 carbon atoms or H or F.