A fluorine-containing ether compound according to the present invention is a fluorine-containing ether compound represented by the following General Formula (1). ##STR00001##

This fluorine-containing ether compound is represented by Formula (1).

R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4—R.sup.5  (1) (in Formula (1), R.sup.1 is an aryl group or an aralkyl group, R.sup.2 is a divalent linking group having 0 or 1 polar group, R.sup.3 is a perfluoropolyether chain, R.sup.4 is a divalent linking group having 2 or 3 polar groups, and R.sup.5 is an aryl group or an aralkyl group.)

This fluorine-containing ether compound is represented by formula (1) shown below.

R.sup.1—CH.sub.2—R.sup.2—CH.sub.2—R.sup.3  (1)

In formula (1), R.sup.2 is a perfluoropolyether chain represented by a formula (2) shown below. R.sup.1 is a terminal group that is bonded to R.sup.2 via a CH.sub.2 group, and is represented by a formula (3) shown below. R.sup.3 is bonded to R.sup.2 via a CH.sub.2 group, is a terminal group having at least one hydroxyl group, and may be the same as, or different from, R.sup.1.

—(CF.sub.2).sub.p-1—O—((CF.sub.2).sub.pO).sub.q—(CF.sub.2).sub.p-1—  (2)

In formula (2), p represents an integer of 2 to 3, and q indicates the average polymerization degree and is a number within a range from 1 to 20.

—O(CH.sub.2—CH(OH)—CH.sub.2—O).sub.2—CH.sub.2—(CH.sub.2).sub.n,—OH  (3)

In formula (3), n represents an integer of 1 to 8.

A fluorine-containing ether compound represented by the following formula (1).

C.sub.6H.sub.6-n—[O—R.sup.1—O—CH.sub.2—R.sup.2—CH.sub.2—R.sup.3].sub.n  (1)

(in the formula (1), n is an integer of 2 or 3, R.sup.1 is any one of —CH.sub.2CH.sub.2—, —CH.sub.2CH.sub.2CH.sub.2— and —CH.sub.2CH(OH)CH.sub.2—, R.sup.2 is a perfluoropolyether chain, R.sup.3 is —OCH.sub.2CH(OH)CH.sub.2O(CH.sub.2).sub.mOH (m in the formula is an integer of 2 to 4)).

Provided are a magnetic disk and, in particular, a compound which makes it possible to realize a lubricant having excellent heat resistance and solubility in a fluorine-based solvent. A perfluoropolyether compound in accordance with an aspect of the present invention has, in hydrocarbon groups at both terminals thereof, five or six hydroxyl groups in total.

A fluorine-containing ether compound represented by the following formula (1).

R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4  (1)

(R.sup.1 is an organic group having an alicyclic structure having 3 to 13 carbon atoms; R.sup.2 is represented by the following formula (2), and a in the formula (2) is an integer of 1 to 3; R.sup.3 is a perfluoropolyether chain; and R.sup.4 is a terminal group having two or three polar groups, in which individual polar groups bond to different carbon atoms and the carbon atoms to which the polar groups bond are bonded to each other through a linking group having a carbon atom to which the polar groups do not bond.)

##STR00001##

A fluorine-containing ether compound represented by the formula (1) is provided. The fluorine-containing ether compound is represented by the following formula (1). R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4 (1) (R.sup.3 is a perfluoropolyether chain; R.sup.1 is the formula (2), a in the formula (2) is an integer of 2 or 3, R.sup.5 and R.sup.6 are the same or different substituents. R.sup.5 and R.sup.6 may form a ring structure together with a nitrogen atom; R.sup.2 is the formula (3), b in the formula (3) is an integer of 1 to 3; R.sup.4 is a terminal group having two or three polar groups, in which individual polar groups bond to different carbon atoms and the carbon atoms to which the polar groups bond are bonded to each other through a linking group having a carbon atom to which the polar groups do not bond.)

##STR00001##

High temperature lubricants for magnetic media are provided. One such lubricant includes fluoroalkyl, fluoroalkenyl, perfluoroalkyl, or perfluoroalkyl ether segments, anchoring functional groups engageable with a protective overcoat of a magnetic recording media, and cyclic functional groups. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

Low-profile thermally stable lubricants for data storage devices are provided based on multi-dentate molecular designs. One such lubricant comprises perfluoroalkyl ether segments, a divalent linking segment, and anchoring functional groups attachable to, or engageable with, a protective overcoat of a magnetic recording medium. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

The present invention relates to polymers obtained by the copolymerization of (per)fluoropolyether (PFPE), tetrafluoroethylene (TFE) and at least one non-homopolymerizable olefin.