Patent ID: 7795375

Claim:
A fluoropolyether compound of the following formula (A): (X—) x Y(—Z) z (A) wherein X is a group of formula (X) HO—(CH 2 CH 2 O) a —(CH 2 CH(OH)CH 2 O) b —(CH 2 ) c —CF 2 O(CF 2 CF 2 O) d — (X) wherein a is an integer of from 0 to 100, b is an integer of from 0 to 100, c is an integer of from 1 to 100, and d is an integer of from 1 to 200; Z is a group of formula (Z): R F O(CF 2 CF 2 O) g — (Z) wherein R F is a C 1-20 perfluoroalkyl group or a group having an etheric oxygen atom inserted between carbon-carbon atoms of such a perfluoroalkyl group with the proviso that the group has no —OCF 2 O— structure, and g is an integer of from 3 to 200, Y is a (x+z) valent perfluorinated saturated hydrocarbon group, or a (x+z) valent perfluorinated saturated hydrocarbon group having an etheric oxygen atom inserted between carbon-carbon atoms, having no —OCF 2 O— structure; wherein x is an integer of at least 2, z is an integer of at least 0, and (x+z) is an integer of from 3 to 20, provided that when x is at least 2, groups represented by the formula (X) may be the same or different, and when z is at least 2, groups represented by the formula (Z) may be the same or different.