A fluorine-containing ether compound represented by Formula (1) is provided,
R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4  (1)
(In Formula (1), R.sup.1 is an alkyl group that may have a substituent, R.sup.2 is a divalent linking group bonded to R.sup.1 via an ethereal oxygen, R.sup.3 is a perfluoropolyether chain, and R.sup.4 is an end group which is different from R.sup.1-R.sup.2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups.).

A fluorine-containing ether compound represented by Formula (1) is provided;
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 and R.sup.5 may be the same as or different from each other and each represents an alkenyl group having 2 to 8 carbon atoms or an alkynyl group having 3 to 8 carbon atoms, R.sup.2 and R.sup.4 may be the same as or different from each other and each represents a divalent linking group having a polar group, and R.sup.3 represents a perfluoropolyether chain, with a proviso that R.sup.1 and R.sup.2 are, and R.sup.4 and R.sup.5 are divided due to the presence of an atom other than the carbon atom such as an oxygen atom).

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

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

(In formula (1), R.sup.1 and R.sup.3 represent different perfluoropolyether chains, R.sup.2 represents a linking group containing one or more polar groups, and R.sup.4 represents a terminal group containing two or more polar groups.)

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

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

(In formula (1), R.sup.1 and R.sup.3 represent different perfluoropolyether chains, R.sup.2 represents a linking group containing one or more polar groups, and R.sup.4 represents a terminal group containing two or more polar groups.)

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

R.sup.1—O—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4—R.sup.5  (1)

(in the formula, R.sup.3 is a perfluoropolyether chain; R.sup.1 is an alkenyl group having 2 to 8 carbon atoms or an alkynyl group having 3 to 8 carbon atoms; R.sup.2 and R.sup.4 are each independently a divalent linking group having one or more hydroxyl groups; and —R.sup.5 is a group represented by Formula (2) shown below.)

—O—(CH.sub.2).sub.g—N—R.sup.6R.sup.7  (2)

(in the formula, g is an integer of 2 or 3; R.sup.6 and R.sup.7 are the same or different saturated aliphatic groups; and R.sup.6 and R.sup.7 may form a ring structure together with a nitrogen atom.)

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

R.sup.1—O—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4—R.sup.5  (1)

(in the formula, R.sup.3 is a perfluoropolyether chain; R.sup.1 is an alkenyl group having 2 to 8 carbon atoms or an alkynyl group having 3 to 8 carbon atoms; R.sup.2 and R.sup.4 are each independently a divalent linking group having one or more hydroxyl groups; and —R.sup.5 is a group represented by Formula (2) shown below.)

—O—(CH.sub.2).sub.g—N—R.sup.6R.sup.7  (2)

(in the formula, g is an integer of 2 or 3; R.sup.6 and R.sup.7 are the same or different saturated aliphatic groups; and R.sup.6 and R.sup.7 may form a ring structure together with a nitrogen atom.)

Provided are a magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including the magnetic tape. The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder. An amount of a fluid lubricant extracted from a surface of the magnetic layer after sliding on a magnetic head in an environment of a temperature of 60° C.±1° C. and a relative humidity of 10% is 50% or more of an amount of the fluid lubricant extracted from the surface of the magnetic layer before the sliding, on a mass basis.

This fluorine-containing ether compound is a fluorine-containing ether compound represented by formula (1).
R.sup.1—X—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4  (1)
(In formula (1), R.sup.1 is an alkenyloxy group of 2 to 8 carbon atoms or an alkynyloxy group of 3 to 8 carbon atoms. R.sup.2 is represented by formula (2) shown below. In formula (2), a represents an integer of 1 to 3. X is represented by formula (3) shown below. In formula (3), b represents an integer of 1 to 5, Y is a divalent linking group that is bonded to a carbon atom in formula (2), and R represents an alkyl group of 1 to 6 carbon atoms or H. R.sup.3 represents a perfluoropolyether chain. R.sup.4 represents a terminal group containing two or three polar groups, wherein each polar group is bonded to a different carbon atom, and the carbon atoms to which the polar groups are bonded are bonded to each other via a linking group containing a carbon atom to which a polar group is not bonded.) ##STR00001##

According to one aspect of the present invention, an organic fluorine compound is represented by a general formula
(R-π-E-CH.sub.2).sub.2-A  (1A)
(where A is a divalent perfluoropolyether group, π is an arylene group or a single bond, R is an alkenyl group or an alkynyl group, and E is an ether bond or an ester bond or a group that is represented by a chemical formula
—O—CH.sub.2CH(OH)CH.sub.2O—
two groups each of which is represented by a general formula
R-π-E-CH.sub.2—
may be the same or different, and at least one n among two π is an arylene group).

Provided are a lubricant that is highly resistant to contamination and highly thermally stable, a lubricant that is highly durable and highly heat resistant, and a magnetic disk. A fluoropolyether compound contains perfluoropolyether groups, end groups each containing at least one hydroxyl group, and a linking group that is comprised of a C.sub.4-C.sub.14 hydrocarbon group and that contains at least one hydroxyl group.