The present invention relates to a fluorine-containing ether compound represented by Formula (1),
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 end group including an organic group having at least one double bond or triple bond, R.sup.2 is a divalent linking group bonded to R.sup.1 by etheric oxygen, R.sup.3 is a perfluoropolyether chain, R.sup.4 is an end group having two or three 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 carbon atoms to which the polar groups are not bonded.)

There are provided a solvent composition containing tDCE, which does not exert an adverse effect on the global environment, has high solubility and incombustibility, and can maintain initial incombustibility even in use accompanied by a phase change, a cleaning method using the solvent composition, a coating film-forming composition including the solvent composition, and a method of forming a homogeneous coating film using the coating film-forming composition. A solvent composition includes: tDCE; a first HFE having a boiling point of 40 to 65 C.; and a second HFE having a boiling point of 70 to 120 C., in which a ratio of tDCE is 65 to 80 mass %, a ratio of the first HFE is 5 to 25 mass %, and a ratio of the second HFE is 5 to 25 mass % with respect to a total amount of tDCE, the first HFE, and the second HFE.

The present invention relates to a fluorine-containing ether compound represented by Formula (1),

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

(In Formula (1), R.sup.1 is an end group including an organic group having at least one double bond or triple bond, R.sup.2 is a divalent linking group bonded to R.sup.1 by etheric oxygen, R.sup.3 is a perfluoropolyether chain, R.sup.4 is an end group having two or three 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 carbon atoms to which the polar groups are not bonded.)

There are provided a solvent composition containing tDCE, which does not exert an adverse effect on the global environment, has high solubility and incombustibility, and can maintain initial incombustibility even in use accompanied by a phase change, a cleaning method using the solvent composition, a coating film-forming composition including the solvent composition, and a method of forming a homogeneous coating film using the coating film-forming composition. A solvent composition includes: tDCE; a first HFE having a boiling point of 40 to 65 C.; and a second HFE having a boiling point of 70 to 120 C., in which a ratio of tDCE is 65 to 80 mass %, a ratio of the first HFE is 5 to 25 mass %, and a ratio of the second HFE is 5 to 25 mass % with respect to a total amount of tDCE, the first HFE, and the second HFE.

The lubricating oil composition for an internal combustion engine of the invention contains (A) a lubricant base oil composed of a mineral oil and/or a synthetic oil, (B) a boron-containing alkenylsuccinimide and/or a boron-containing alkylsuccinimide in an amount of 0.001 to 0.1% by mass as a boron-equivalent amount based on the total amount of the composition, and (C) a poly(meth)acrylate in an amount of 0.1 to 30% by mass based on the total amount of the composition, and the poly(meth)acrylate has Mw of 100,000 to 700,000 and Mw/X of 30,000 or more, in which the weight-average molecular weight thereof is represented by Mw and the mean carbon number of the alkyl groups therein, as measured through .sup.13C-NMR, is represented by X.