Patent ID: 8410034

Claim:
An ether composition comprising at least two ether compounds (A) each of which has from 1 to 4 groups represented by the following formula (X) and from 0 to 3 groups represented by the following formula (Z), with the total of the groups represented by the formula (X) and the groups represented by the formula (Z) being 4: HO—(CH 2 CH 2 O) a .(CH 2 CH(OH)CH 2 O) b -Q- (X), CF 3 (CF 2 ) s O(CF 2 CF 2 O) g — (Z), provided that in the above formulae (X) and (Z), a is an integer of from 0 to 100, b is 0 or 1, s is an integer of from 0 to 19, g is an integer of from 3 to 200, and Q is a polyfluorinated polymethylene group or a polyfluorinated polymethylene group having an etheric oxygen atom, wherein the ratio (CF 3 /(OH+CF 3 )) of the total molar amount of CF 3 groups in the groups represented by the formula (Z) to the sum of the total molar amount of CF 3 groups in the groups represented by the formula (Z) and the total molar amount of OH groups in the groups represented by the formula (X) is from 0.01 to 0.5.