Patent ID: 7230140

Claim:
A perfluoropolyether derivative composition comprising at least two types of compounds represented by the following formula (1): HO—(CH 2 CH 2 O) r .(CH 2 CH(OH)CH 2 O) p —CH 2 CF 2 O(CF 2 CF 2 O) m CF 2 CH 2 O——(CH 2 CH(OH)CH 2 O) q .(CH 2 CH 2 O) s -H Formula (1) wherein m represents the number of -(CF 2 CF 2 O)- units and is an integer of from 3 to 200, each of r and s which are independent of each other, represents the number of —(CH 2 CH 2 O)— units and is an integer of from 0 to 100, and each of p and q which are independent of each other, represents the number of —(CH 2 CH(OH)CH 2 O)— units and is an integer of from 0 to 100, provided that when each of r and p which are independent of each other, is an integer of at least 1, or when each of q and s which are independent of each other, is an integer of at least 1, the arrangement of —(CH 2 CH 2 O)— and —(CH 2 CH(OH)CH 2 O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, the —(CH 2 CH 2 O)— and —(CH 2 CH(OH)CH 2 O)— units may be arranged in a block form or at random, and wherein at least one of the types of compounds represented by the following formula (1)is a compound wherein at least one of p, q, r, and s is a positive integer.