Perfluoropolyether group-containing acrylate compound

A perfluoropolyether group-containing acrylate compound represented by the following formula (1):

• X1—[Z—Rf—Z—X2]v—Z—Rf—Z—X1 (1)
• wherein Rf is a divalent perfluoropolyether group with a molecular weight of from 500 to 30000, optionally having branched structure;
• X1 is, independently of each other, a group represented by the following formula (2):
• wherein a and c are an integer of from 0 to 4;
• b is an integer of from 1 to 4, provided that a total of a, b and c is 2, 3 or 4;
• R1 is, independently of each other, a group represented by the following formula (3),
• —(C4H8O)d(C3H6O)e(C2H4O)f(CH2O)gR3 (3)
• wherein d, e, f and g are, independently of each other, an integer of from 0 to 20, provided that a molecular weight of R1 is in a range of 30 to 600;
• the repeating units may be sequenced at random;
• and
• R3 is a saturated or unsaturated hydrocarbon residue having 1 to 10 carbon atoms;
• R2 is an acryl group- or alpha-substituted acryl group-containing group represented by the following formula (4):
• wherein R4 is, independently of each other, a hydrogen atom, a fluorine atom, a methyl group or a trifluoromethyl group;
• R5 is a divalent or trivalent linking group having 1 to 18 carbon atoms, optionally having an ether bond and/or ester bond;
• and
• n is an integer of 1 or 2;
• Q1 and Q2 may be same with or different from each other and are a divalent linking group with 3 to 20 carbon atoms, optionally having an ether bond, an ester bond, an amide bond or a urethane bond and optionally having cyclic or branched structure;
• X2 is, independently of each other, a group represented by the following formula (5)
• wherein R1, R2, Q1 and Q2 are as defined above;
• h, i and j are an integer of from 0 to 3, provided that a total of h, i and j is an integer of from 1 to 3;
• and
• the repeating units may be sequenced at random;
• Z is a divalent organic group, optionally containing an oxygen atom, a nitrogen atom or a fluorine atom and unsaturated bond, and optionally having cyclic structure;
• and
• v is an integer of from 0 to 5.