The present invention relates to the use of highly viscous (per)fluoropolyether polymers as damping fluids and to a method for counteract vibrations and/or shocks in a device using highly viscous (per)fluoropolyether polymers.

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).

A fluorine-containing ether monocarboxylic acid aminoalkyl ester represented by the general formula:

C.sub.nF.sub.2n+1O[CF(CF.sub.3)CF.sub.2O].sub.aCF(CF.sub.3)COO(CH.sub.2).sub.bNR.sup.1R.sup.2

(wherein R.sup.1 is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group, or an aralkyl group, preferably an alkyl group having 1to 6 carbon atoms or an aryl group; R.sup.2 is an alkyl group having 1 to 12 carbon atoms, an aryl group, or an aralkyl group, preferably an alkyl group having 1to 6 carbon atoms or an aryl group; n is an integer of 1 to 3; a is an integer of 2 to 20, preferably an integer of 4 to 10; and b is an integer of 1 to 12, preferably an integer of 1 to 3). Such a fluorine-containing ether monocarboxylic acid ester having an amino group at the end of the ester group is produced by reacting a perfluoroether carboxylic acid fluoride compound C.sub.nF.sub.2n+1O[CF(CF.sub.3)CF.sub.2O].sub.1CF(CF.sub.3)COF and a hydroxyalkyl amine compound HO(CH.sub.2).sub.bNR.sup.1R.sup.2 in the presence of an alkali metal fluoride.

[Object] To provide lubricating thermoplastic resin compositions that can give formed articles exhibiting excellent lubricating properties and surface appearance and maintaining the lubricating properties permanently. [Solution] The lubricating thermoplastic resin composition includes an acid-modified copolymer (A) of a monomer mixture including an aromatic vinyl and a vinyl cyanide, the copolymer having a carboxyl group in the molecular chain, and a functionalized lubricant (B) having, in the molecule, a functional group (B1) capable of reacting with the carboxyl group and a lubricating segment (B2) having lubricating properties. The composition may further include a graft copolymer (C) and/or an additional thermoplastic resin (D) other than the acid-modified copolymer (A).

[Object] To provide lubricating thermoplastic resin compositions that can give formed articles exhibiting excellent lubricating properties and surface appearance and maintaining the lubricating properties permanently. [Solution] The lubricating thermoplastic resin composition includes an acid-modified copolymer (A) of a monomer mixture including an aromatic vinyl and a vinyl cyanide, the copolymer having a carboxyl group in the molecular chain, and a functionalized lubricant (B) having, in the molecule, a functional group (B1) capable of reacting with the carboxyl group and a lubricating segment (B2) having lubricating properties. The composition may further include a graft copolymer (C) and/or an additional thermoplastic resin (D) other than the acid-modified copolymer (A).

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.

What is provided is a fluorine-containing ether compound represented by the following formula.
R.sup.1CH.sub.2R.sup.2CH.sub.2OCH.sub.2CH(OH)CH.sub.2OCH.sub.2R.sup.3CH.sub.2R.sup.4
(In the formula, R.sup.2 and R.sup.3 are perfluoropolyether chains, and R.sup.1 and R.sup.4 are terminal groups having two or three polar groups, in which individual polar groups are bound to different carbon atoms and the carbon atoms to which the polar groups are bound are bound to each other via a linking group having a carbon atom to which the polar groups are not bound).

The invention pertains to certain (per)fluoropolyether triazine derivatives comprising at least one triazine group and at least one fluoropolyoxyalkene chain (chain R.sub.f) comprising a fluorocarbon segment having ether linkages in main chain, said chain R.sub.f comprising at least one hydroxyl group, to a method for their manufacture and to their use in lubrication, in particular for lubricating sliding or moving parts of magnetic recording media.

The present invention relates to a viscosity index improver containing a copolymer (A) that contains, as essential constituent monomers, a fluorine atom-containing monomer (a) represented by the following formula (1) and a monomer (b) represented by the following formula (2), wherein the copolymer (A) has a solubility parameter of 8.1 to 10.0 (cal/cm.sup.3).sup.1/2, and a mass ratio (b/a) of the monomer (b) to the monomer (a) in the monomers constituting the copolymer (A) is 0.01 to 42: ##STR00001##
wherein R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 is a C2-C4 alkylene group; p is an integer of 0 or 1; q is an integer from 0 to 20, each R.sup.2 may be the same as or different from each other when q is 2 or greater; and Y is a monovalent group in which one or more or all of hydrogen atoms in a C1-C40 hydrocarbon group are replaced by fluorine atoms, and ##STR00002##
wherein R.sup.3 represents a hydrogen atom or a methyl group; X.sup.1 is a group represented by O or NH; R.sup.4 is a C2-C4 alkylene group; r is an integer of 0 or 1; s is an integer from 0 to 20, and each R.sup.4 may be the same as or different from each other when s is 2 or greater; and R.sup.5 is a C1-C40 hydrocarbon group.

The present invention relates to a viscosity index improver containing a copolymer (A) that contains, as essential constituent monomers, a fluorine atom-containing monomer (a) represented by the following formula (1) and a monomer (b) represented by the following formula (2), wherein the copolymer (A) has a solubility parameter of 8.1 to 10.0 (cal/cm.sup.3).sup.1/2, and a mass ratio (b/a) of the monomer (b) to the monomer (a) in the monomers constituting the copolymer (A) is 0.01 to 42: ##STR00001##
wherein R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 is a C2-C4 alkylene group; p is an integer of 0 or 1; q is an integer from 0 to 20, each R.sup.2 may be the same as or different from each other when q is 2 or greater; and Y is a monovalent group in which one or more or all of hydrogen atoms in a C1-C40 hydrocarbon group are replaced by fluorine atoms, and ##STR00002##
wherein R.sup.3 represents a hydrogen atom or a methyl group; X.sup.1 is a group represented by O or NH; R.sup.4 is a C2-C4 alkylene group; r is an integer of 0 or 1; s is an integer from 0 to 20, and each R.sup.4 may be the same as or different from each other when s is 2 or greater; and R.sup.5 is a C1-C40 hydrocarbon group.