Fluorine-containing boric acid composite capsule particles comprising a condensate of a fluorine-containing alcohol, a guest compound, and boric acid particles, wherein the fluorine-containing alcohol is represented by the general formula:
R.sub.F-A-OH
wherein R.sub.F is: a perfluoroalkyl group having 6 or less carbon atoms, a linear or branched perfluoroalkyl group containing a terminal perfluoroalkyl group having 6 or less carbon atoms and a perfluoroalkylene group having 6 or less carbon atoms, and containing an O, S, or N atom, or a polyfluoroalkyl group in which some of the fluorine atom or atoms of the perfluoroalkyl group are replaced by hydrogen atom or atoms, and which contains a terminal perfluoroalkyl group having 6 or less carbon atoms and a perfluoroalkylene group having 6 or less carbon atoms, wherein the perfluoroalkylene group may contain an O, S, or N atom, and one fluorine atom of the terminal perfluoroalkyl group may be replaced by (CH.sub.2).sub.fOH (wherein f is an integer of 1 to 3); and A is an alkylene group having 1 to 6 carbon atoms.

A compound of formula (I): (I) wherein X is Al or B: R.sup.1 in each occurrence is independently a substituent; and two R.sup.1 groups may be linked to form a ring; and M.sup.+ is a cation. The compound may be used in a metal ion battery or metal battery.

A compound of formula (I): (I) wherein X is Al or B: R.sup.1 in each occurrence is independently a substituent; and two R.sup.1 groups may be linked to form a ring; and M.sup.+ is a cation. The compound may be used in a metal ion battery or metal battery.

The disclosure provides a fluoropolyether compound represented by formula (1):
R.sup.1CH.sub.2R.sup.2CH.sub.2R.sup.3
wherein R.sup.1 is C.sub.1-C.sub.10 alkoxy; R.sup.2 is (CF.sub.2).sub.pO(CF.sub.2O).sub.x(CF.sub.2CF.sub.2O).sub.y(CF.sub.2CF.sub.2CF.sub.2O).sub.z(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.w(CF.sub.2).sub.p; x and y are each a real number of 0 to 30; z is a real number of 0 to 30; w is a real number of 0 to 20; p is an integer of 1 to 3; R.sup.3 is OCH.sub.2CH(OH)CH.sub.2OH, OCH.sub.2CH(OH)CH.sub.2OCH.sub.2CH(OH)CH.sub.2OH, O(CH.sub.2).sub.mOH, or OCH.sub.2(OH)CHCH.sub.2OC.sub.6H.sub.4R.sup.4; m is an integer of 2 to 8; and R.sup.4 is hydrogen, C.sub.1-C.sub.4 alkoxy, amino, or an amide residue; and also provides a lubricant having the compound and a magnetic disk.

A fluorine-containing ether compound represented by the following formula (1) is provided.
R.sup.2CH.sub.2R.sup.1CH.sub.2OCH.sub.2CH(OH)(CH.sub.2).sub.nCH(OH)CH.sub.2OCH.sub.2R.sup.1CH.sub.2R.sup.2(1)
(in the formula (1), n is an integer of 2 to 6, R.sup.1 is a perfluoropolyether chain, R.sup.2 is OCH.sub.2CH(OH)CH.sub.2O(CH.sub.2).sub.mOH (m in the formula is an integer of 2 to 4)).

The present invention aims to provide a water-absorbing resin crosslinking agent which is excellent in safety and which can effectively crosslink a water-absorbing resin at low temperatures to produce a water-absorbing agent having a high water absorption capacity. The present invention also aims to provide a water-absorbing agent produced by crosslinking a water-absorbing resin with the water-absorbing resin crosslinking agent, and a method for producing the water-absorbing agent. The present invention may include a water-absorbing resin crosslinking agent containing a halohydrin compound having one halohydrin group represented by the following formula (1) in its molecule: ##STR00001##
wherein A represents a single bond or an alkylene group; R.sup.1 represents a hydrogen atom or an alkyl group; and X represents a chlorine atom or a bromine atom.

An object of the present invention is to provide a compound that is resistant to decomposition even when coming into contact with a magnetic head, while enabling a reduced spacing between the magnetic head and a magnetic disk, and to provide a lubricant comprising the compound, and a magnetic disk comprising the compound. The present invention relates to a compound represented by formula (1), a lubricant comprising the compound, and a magnetic disk comprising the compound:
C.sub.6H.sub.6-i[O(CH.sub.2).sub.nOCH.sub.2RCH.sub.2X].sub.i(1)
wherein n is an integer of 2 to 6; i is an integer of 2 or 3; X is a group represented by OH, O(CH.sub.2).sub.mOH, OCH.sub.2CH(OH)CH.sub.2OH, OCH.sub.2CH(OH)CH.sub.2OC.sub.6H.sub.5, or OCH.sub.2CH(OH)CH.sub.2OC.sub.6H.sub.4OCH.sub.3; m is an integer of 1 to 6; R is (CF.sub.2).sub.pO(CF.sub.2O).sub.x(CF.sub.2CF.sub.2O).sub.y(CF.sub.2CF.sub.2CF.sub.2O).sub.z(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.w(CF.sub.2).sub.p; x and y are each a real number of 0 to 30; z is a real number of 0 to 30; w is a real number of 0 to 20; and p is an integer of 1 to 3.

A fluorine-containing ether compound of the present invention is represented by Formula (1).

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

(In Formula (1), R.sup.1 is an organic end group having 3 or more carbon atoms which includes two or more polar groups with each polar group being bonded to different carbon atoms and the carbon atoms to which the polar groups are bonded being bonded to each other via a linking group including the carbon atoms which are not bonded to the polar groups, R.sup.2 includes a perfluoropolyether chain represented by Formula (3), and R.sup.3 is a hydroxyl group or R.sup.1)

(CF.sub.2).sub.y-1O((CF.sub.2).sub.yO).sub.z(CF.sub.2).sub.y-1(3)

(In Formula (3), y represents an integer of 2 to 4, and z represents an integer of 1 to 30).

Provided herein is a lubricant including a compound of Formula I

L-(CF.sub.2CF.sub.2O).sub.nCF.sub.2CH.sub.2ONOCH.sub.2CF.sub.2O(CF.sub.2CF.sub.2O).sub.m-M (Formula I) wherein L is selected from the group consisting of

##STR00001## M is selected from the group consisting of

##STR00002## wherein each instance of R.sup.1, R.sup.2, and R.sup.3 is independently selected from the group consisting of hydroxyl, alkoxyl, carbocycyl, phenyl, heterocycyl, piperonyl, carboxyl, alkylamido, acetamido, carbamoyl, N-alkylcarbamoyl, N,N-dialkylcarbamoyl, 2,3-dihydroxy-l-propoxyl, acryloyl, alkacryloyl, methacryloyl, a sustituent of methyl methacrylate, and a substituent of glycidyl ether; and wherein n1, m1, and n and m are the same or different.

The disclosure provides a fluoropolyether compound represented by formula (1):

R.sup.1CH.sub.2R.sup.2CH.sub.2R.sup.3

wherein R.sup.1 is C.sub.1-C.sub.10 alkoxy; R.sup.2 is (CF.sub.2).sub.pO(CF.sub.2O).sub.x(CF.sub.2CF.sub.2O).sub.y(CF.sub.2CF.sub.2CF.sub.2O).sub.z(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.w(CF.sub.2).sub.p; x and y are each a real number of 0 to 30; z is a real number of 0 to 30; w is a real number of 0 to 20; p is an integer of 1 to 3; R.sup.3 is OCH.sub.2CH(OH)CH.sub.2OH, OCH.sub.2CH(OH)CH.sub.2OCH.sub.2CH(OH)CH.sub.2OH, O(CH.sub.2).sub.mOH, or OCH.sub.2(OH)CHCH.sub.2OC.sub.6H.sub.4R.sup.4; m is an integer of 2 to 8; and R.sup.4 is hydrogen, C.sub.1-C.sub.4 alkoxy, amino, or an amide residue; and also provides a lubricant having the compound and a magnetic disk.