Patent ID: 7582703

Claim:
A cross-linkable compound comprising a perfluoropolyether (PFPE)-containing moiety which is ultimately terminated by an oxygen atom and bonded through a spacer attached to the said oxygen atom with an ethylenically unsaturated group, wherein the spacer extends linearly over at least three atoms in a row between the oxygen atom and the ethylenically unsaturated group, said cross-linkable compound having the formula D—(C n F 2n O) m —Q—B—A, wherein A stands for an ethylenically unsaturated group selected from the group consisting of HR 1 C═CR 2 — and HR 1 C═CR 2 Si(R 4 ) 2 —, wherein R 1 is selected from H, alkyl, phenyl, alkyl-substituted phenyl and aralkyl; R 2 is selected from H, alkyl, phenyl, alkyl-substituted phenyl and aralkyl and R 4 being independently H or alkyl; B stands for a hydrocarbyl or fluorocarbyl spacer extending over at least three carbon atoms; (C n F 2n O) m is the PFPE moiety wherein n1 is independently an integer of 1 to 4 and m is an integer of 2 to 500; Q stands for a bivalent group selected from —CF 2 —CH 2 —O—and —CH 2 —CH 2 —O—; and D stands for HO—CH 2 CF 2 —O— or A—B—Q—O—, wherein n, A, B, and Q have the previously given meanings.