Perfluoropolyether compound, and lubricant and magnetic disk each using the same

摘要

A compound of the formula (I), and lubricant, and magnetic disk each using the same A-(CH2—Rf—CH2O—B—O)n—CH2—Rf—CH2-A  (I) wherein n is an integer of 1 to 4, A is a group of the formula (a) below, and B is a group of the formula (b) below, p being 1 or 2, R being C1-4 fluoroalkyl, Rf is —CF2O(CF2CF2O)x(CF2O)yCF2— or —CF2CF2O(CF2CF2CF2O)nCF2CF2—, x, y and z being each a real number of 0 to 50.