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  Lubricant for water-miscible metal working oilUSPTO Application #: 20070010406Title: Lubricant for water-miscible metal working oil Abstract: and water-based metal working oil containing said lubricant. They are superior in lubricity to steel materials as well as, particularly, lubricity to soft metal such as aluminum, and excellent because of stability on dilution with water and non-separation property.
[in the formula, R1 denotes a residue such that at least one hydroxyl group is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s); A1 denotes an alkylene group with a carbon number of 2 to 4 except a 1,4-butylene group; A2 denotes an alkylene group with a carbon number of 2 to 4; m denotes an integer of 1 or more having an average of 1 to 120; n and p each denotes an integer of 0, 1 or more such that an average of (n+p) is 1 to 200, and n and p are not simultaneously 0; q denotes an integer of 1 to 6; and {(OCH2CH2CH2CH2)m/(OA1)n} in a case where n is an integer of 1 or more denotes a random bond],
R1[{(OCH2CH2CH2CH2)m/(OA1)n}(OA2)p—OH]q (1)
The present invention provides a lubricant for water-based metal working oil containing polyether (E) represented by the following general formula (1) and having an HLB of 6.1 to 16.0 and a weight-average molecular weight of 500 to 10,000 (end of abstract)
Agent: Westerman, Hattori, Daniels & Adrian - Washington, DC, US Inventors: Tsuyoshi Okamoto, Takaichi Imai USPTO Applicaton #: 20070010406 - Class: 508579000 (USPTO) Related Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Organic Oxygen Compound, Ethers The Patent Description & Claims data below is from USPTO Patent Application 20070010406. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a lubricant for water-based metal working oil, and detailedly to polyether lubricant for water-based metal working oil, lubricant composition for water-based metal working oil and water-based metal working oil. BACKGROUND ART [0002] Examples of water-based metal working oils such as cutting oil, rolling oil, drawing oil, pressing oil, forging oil, abrasive working oil for aluminum disk, abrasive oil for silicon wafer and coolant for cutting silicon wafer include solution type, soluble type and emulsion type. [0003] Performances required therefor are lubricity, low-foaming property, water dilution stability (stability of a diluent diluted with water during use) and oil separation property from other mineral oil-based working oil. [0004] Polyether has been conventionally used as a lubricant used for water-based metal working oil. The polyether is, so-called Pluronic type or counter Pluronic type, a block copolymer of ethylene oxide and propylene oxide (for example, refer to U.S. Pat. Nos. 4,414,121 and 4,636,321) or a random copolymer of ethylene oxide and propylene oxide. [0005] Polyethylene oxide chain contained in the polyether is introduced in order to improve water dilution stability by increasing hydrophilicity, and the polyether generally has an average molecular weight of 800 or more in order to improve lubricity. SUMMARY OF THE INVENTION [0006] The object of the present invention is to provide a lubricant for water-based metal working oil, which is superior in lubricity to steel materials as well as, particularly, lubricity to soft metal such as aluminum. [0007] Another object of the present invention is to provide a lubricant composition for water-based metal working oil, which comprises the above-mentioned lubricant and other additives and is superior in lubricity. [0008] A further object of the present invention is to provide water-based metal working oil which comprises water and the above-mentioned lubricant or the above-mentioned lubricant composition, and is superior in lubricity, low-foaming property, water dilution stability and oil separation property. [0009] According to the present invention, the above-mentioned object is completed by a lubricant for water-based metal working oil (hereinafter abbreviated as a lubricant) containing polyether (E) represented by the following general formula (1) and having an HLB of 6.1 to 16.0 and a weight-average molecular weight of 500 to 10,000. R.sup.1[{(OCH.sub.2CH.sub.2CH.sub.2CH.sub.2).sub.m/(OA.sup.1).sub.n}(OA.s- up.2).sub.p--OH].sub.q (1) [0010] In the formula, R.sup.1 denotes a residue such that at least one hydroxyl group is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s); A.sup.1 denotes an alkylene group with a carbon number of 2 to 4 except a 1,4-butylene group; A.sup.2 denotes an alkylene group with a carbon number of 2 to 4; m denotes an integer of 1 or more having an average of 1 to 120; n and p each denotes an integer of 0, 1 or more such that the average of (n+p) is 1 to 200, and n and p are not simultaneously 0; q denotes an integer of 1 to 6; and {(OCH.sub.2CH.sub.2CH.sub.2CH.sub.2).sub.m/(OA.sup.1).sub.n} in the case where n is an integer of 1 or more denotes a random bond. [0011] The present invention is also a lubricant composition for water-based metal working oil, which comprises the above-mentioned polyether (E) and other additives. [0012] The present invention is also water-based metal working oil which comprises water and the above-mentioned lubricant or the above-mentioned lubricant composition, and contains the polyether (E) of 0.01 to 95 weight % in quantity on the basis of the weight of the above-mentioned metal working oil. DETAILED DESCRIPTION OF THE INVENTION [0013] In the general formula (1) of the present invention, R.sup.1 is a residue such that at least one hydroxyl group, preferably all hydroxyl groups, is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s). [0014] Examples of R.sup.1 include a residue of linear, branched or alicyclic monohydric to hexahydric aliphatic alcohols, a residue of monohydric to hexahydric phenols, a residue of monohydric to hexahydric aromatic group-containing aliphatic alcohols, a residue of heterocyclic dihydric alcohols, and a residue of sugars and derivatives thereof. [0015] Examples of these alcohols and phenols include the following (e1) to (e5). [0016] (e1) aliphatic alcohols [0017] (e11) monohydric alcohols [0018] (e111) linear or branched aliphatic saturated monohydric alcohols with a carbon number of 1 to 24: [0019] methanol, ethanol, propanol (such as n-propanol and isopropanol), butanol, pentanol, hexanol, heptanol, octanol (such as n-octanol and 2-ethylhexyl alcohol), nonyl alcohol, decyl alcohol, undecyl alcohol, dodecyl alcohol, tridecyl alcohol (such as n-tridecyl alcohol and isotridecyl alcohol), tetradecyl alcohol, pentadecyl alcohol, hexadecyl alcohol, heptadecyl alcohol, octadecyl alcohol, nonadecyl alcohol, eicosyl alcohol, heneicosyl alcohol, docosyl alcohol, tricosyl alcohol, tetracosyl alcohol, and the like [0020] (e112) linear or branched aliphatic unsaturated monohydric alcohols with a carbon number of 3 to 24: Continue reading... 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