Patent ID: 7956023

Claim:
A lubricant solution for magnetic recording media, which comprises a lubricant and a fluorinated alkyl ether, wherein the lubricant is composed of a fluorinated polyether compound of the following formula (1) and the fluorinated alkyl ether is a compound of the following formula (4): (X—) e Y(—Z) f (1) wherein X is a group of the following formula (2): HO—(CH 2 CH 2 O) a —(CH 2 CH(OH)CH 2 O) b —(CH 2 ) c —CF 2 (OCF 2 CF 2 ) d —O— (2) 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 the following formula (3): R F O(CF 2 CF 2 O) g — (3) 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, and g is an integer of from 3 to 200, Y is a (e+f) valent perfluorinated saturated hydrocarbon group or such a (e+f) valent perfluorinated saturated hydrocarbon group having an etheric oxygen atom inserted between carbon-carbon atoms, wherein no —OCF 2 O— structure is present, and e is an integer of at least 2, and f is an integer of at least 0, provided that (e+f) is an integer of from 2 to 20, a plurality of X when e is at least 2, may be the same or different, and a plurality of Z when f is at least 2 may be the same or different, with the proviso that a fluorinated polyether compound which satisfies the following conditions: e is 2, f is 0, a is 0 and b is 0, is excluded from the fluorinated polyether compounds according to formula (1); R 1 —O—R 2 (4) wherein each of R 1 and R 2 which are independent of each other, is a C 1-4 fluorinated alkyl group, provided that the total number of carbon atoms contained in R 1 and R 2 is from 3 to 6.