A fluorine-containing ether compound represented by R.sup.1R.sup.2CH.sub.2R.sup.3CH.sub.2R.sup.4R.sup.5 is provided. (R.sup.3 is a perfluoropolyether chain; R.sup.1 and R.sup.5 are each independently any one of an alkyl group that may have a substituent, an organic group having at least one double bond or at least one triple bond, and a hydrogen atom; and R.sup.2CH.sub.2R.sup.3 is represented by Formula (2), and R.sup.3CH.sub.2R.sup.4 is represented by Formula (3))

-[A]-[B]OCH.sub.2R.sup.3 (2)

R.sup.3CH.sub.2O[C]-[D]- (3)

([A] is represented by Formula (4), [B] is represented by Formula (5), [C] is represented by Formula (6), [D] is represented by Formula (7), and in the formula, a and b are integers of 0 to 2, c is an integer of 2 to 5, d and f are integers of 0 to 2, and e is an integer of 2 to 5, and at least one of b and d in the formula is 1 or more)

##STR00001##

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

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

An electrorheological fluid which comprises a dispersion medium containing fluorine atoms in an amount larger than 0 wt % but not larger than 50.0 wt % and particles for electrorheological fluid use that are contained in the dispersion medium in an amount of 10-50 vol % of the total volume of the dispersion medium and the particles, the particles comprising a sulfonic-acid-group-containing polymer having a sulfonic acid group content of 30-70 wt %.

Provided is a lubricant composition having small shear rate dependence of its apparent viscosity. The lubricant composition includes a perfluoropolyether as a base oil, and fluorine resin particles as a thickener. The lubricant composition further includes a fluorine-containing polymer having a tetrafluoroethylene structure under a state in which the polymer is dissolved in the perfluoropolyether.

Provided herein is a lubricant comprising a compound of Formula I: ##STR00001## wherein R.sub.1 and R.sub.2 are independent and have the structure selected from (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, x, y, z and w are selected from an integer from 0 to 30; p, and q are selected from an integer from 0 to 3; A and B are independent and have the structure selected from: (CH.sub.2CH(OH)CH.sub.2O).sub.jH, and j is an integer selected from 0 to 3.

In accordance with the present invention refrigerant compositions are disclosed. The compositions comprise a refrigerant mixture consisting essentially of HFC-32, HFO-1234yf, and CO.sub.2. The compositions are useful in processes to produce cooling and heating, in methods for replacing refrigerant R-32, and in refrigeration, air conditioning or heat pump systems. These inventive compositions are match cooling performance for R-32 with GWP less than 400 or less than 300.

Provided is a compound with which a lubricant having excellent adhesion to a magnetic disk, particularly to a protective layer can be provided. A perfluoropolyether compound in accordance with one aspect of this invention has a structure in which two perfluoropolyethers are bonded to each other through an aliphatic ether, the aliphatic ether including a carbon atom to which a primary alcohol is bonded.

Provided is a fluorine-containing ether compound capable of forming a lubricant layer having excellent wear resistance even when the thickness is thin, and suitable as a material of a lubricant for a magnetic recording medium. The fluorine-containing ether compound is a compound represented by the following formula (1): R.sup.1R.sup.2CH.sub.2R.sup.3CH.sub.2R.sup.4R.sup.5; wherein R.sup.3 is a perfluoropolyether chain; R.sup.1 is a terminal group bonded to R.sup.2; R.sup.5 is a terminal group bonded to R.sup.4; R.sup.1 is an alkenyl group or an alkynyl group; R.sup.5 is a group containing a heterocyclic ring; R.sup.2 is represented by the following formula (2); R.sup.4 is represented by the following formula (3); and a in the formula (2) and b in the formula (3) are each independently an integer of 1 to 3.

##STR00001##

A composition comprising a heat transfer portion and a lubricating portion, wherein the lubricating portion comprises one or more compounds according to formula (I): wherein W is independently selected from the group consisting of H, F, Cl, Br and I; Y is independently selected from the group consisting of F, Cl, Br and I; Z is independently selected from the group consisting of H, OH, (CW.sub.2).sub.PCW.sub.3, CY.sub.3, OCW.sub.3, 0(CW.sub.2).sub.pCW.sub.3, OCW((CY.sub.2).sub.mCY.sub.3)CWCW.sub.2, polyalkylene glycol and polyolester; n is an integer from 2 to 250; m is an integer from 0 to 3; and p is an integer from 0 to 9.

The present invention relates to a coating composition that can produce an article having an inner surface and an outer surface, both of which are slippery, and a method for preparing the same. By using the coating composition according to the present invention, it is possible to produce the article having the inner surface and the outer surface, both of which are slippery, only with a simple process of molding and curing a polymer resin by the technique of the prior art. The article produced using the coating composition of the present invention can solve an ice removal on a surface of the machinery such as an aircraft and an automobile, a biofouling problem in a blood vessel, a problem requiring self-cleaning, and the like, and thus can be used in various industries.