Patent ID: 8729211

Claim:
A fluorocarbon- and urethane-(meth)acryl-containing composition comprising a perfluoropolyether urethane having a perfluoropolyether moiety and a multi-(meth)acryl terminal group and having the formula: n ( p (A)QO(O)CHN)—R i —(NHC(O)XQR f ) m ; wherein R i is the residue of a multi-isocyanate; X is O, S or NR, wherein R is H or an alkyl group having 1 to 4 carbon; R f is a monovalent perfluoropolyether moiety comprising groups of the formula F(R fc O) x C d F 2d -, wherein each R fc is independently a fluorinated alkylene group having from 1 to 6 carbon atoms, each x is an integer greater than or equal to 2, and wherein d is an integer from 1 to 6; each Q is independently a connecting group having a valency of at least 2; A is a (meth)acryl functional group —XC(O)C(R 2 )═CH 2 wherein R 2 is an alkyl group of 1 to 4 carbon atoms or H or F; m is at least 1; n is at least 1; p is 2 to 6; m+n is 2 to 10; wherein the perfluoropolyether urethane further comprises at least one unit attached to the R i unit selected from —(NHC(O)XQG), —(NCO), R f (O)(XC(O)NH) y —, —(NHC(O)XQD(QXC(O)NH) u —, -D 1 (QXC(O)NH) y , —(NHC(O)OQ(A) t Q 1 Q(A) t OC(O)NH)—, and (NHC(O)XQ-R f2 (QXC(O)NH) u —, wherein G is selected from the group consisting of alkyl, aryl, alkaryl, aralkyl, fluoroalkyl, perfluoroalkyl; or a reactive group selected from (meth)acryl groups, vinyl groups, allyl groups and —Si(OR 3 ) 3 groups, where R 3 is a lower alkyl of 1 to 4 carbon atoms; D is selected from the group consisting of alkylene, arylene, alkarylene, fluoroalkylene, perfluoroalkylene, and aralkylene; or said D group further containing heteroatoms selected from O, N, and S; D 1 is selected from the group consisting of alkyl, aryl, alkaryl, fluoroalkyl, perfluoroalkyl, and aralkyl, or said D 1 group further containing heteroatoms selected from O, N, and S; Q 1 are each independently a connecting group of valency at least 2; R f2 is a multi-valent perfluoropolyether moiety having the formula Y((R fc1 O) x C d1 F 2d1 ) b , wherein each R fc1 is independently selected from: —CF(CF 3 )CF 2 —, —CF 2 CF 2 CF 2 —, and (CH 2 C(CH 3 )(CH 2 OCH 2 CF 3 )CH 2 —) aa where aa is 2 or greater; each x is independently an integer greater than or equal to 2, d1 is an integer from 0 to 6; Y represents a polyvalent organic group or covalent bond having a valence of b, and b represents an integer greater than or equal to 2; y is independently 2 or greater; u is independently 1 to 3; and t is 1-6.