EP0305022A1
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EP
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Lubricating oil composition
Assignee: Mitsui Chemicals Inc
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Filing: 1988-02-12
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Granted: —
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Expires: 2008-02-12
Abstract
Abstract Disclosed is a lubricating oil composition comprising, as indispensable components, (A) a synthetic hydrocarbon lubricating oil, (B) a load-withstanding additive and (C) a liquid ethylene/α-olefin random copolymer modified by graft copolymerisation with an unsaturated carboxylic acid or a derivative thereof. In this lubricating oil composition, the load-withstanding oil is homogeneously and stably incorporated. This lubricating oil is significant in that the poor compatibility with a load-withstanding additive, which is the defect of synthetic hydrocarbon lubricating oils, is effectively overcome.
Inventors
- 👤 Ryousuke Kaneshige
- 👤 Kinya Mizui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:33
CPC Classifications
C; C10; C10M; C10M161/00; C10M169/00; C10M169/04; C10M169/044; C10M105/00; C10M105/02; C10M105/04; C10M105/06; C10M107/00; C10M107/02; C10M107/04; C10M107/06; C10M107/08; C10M107/10; C10M129/00; C10M129/02; C10M129/04; C10M129/06; C10M129/26; C10M129/28; C10M129/38; C10M129/40; C10M129/56; C10M129/58; C10M131/00; C10M131/02; C10M131/04; C10M131/14; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M135/00; C10M135/12; C10M135/14; C10M135/18; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M143/00; C10M143/02; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M145/16; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/045; C10M2203/06; C10M2203/065; C10M2205/00; C10M2205/02; C10M2205/0206; C10M2205/022; C10M2205/0225; C10M2205/024; C10M2205/0245; C10M2205/026; C10M2205/0265; C10M2205/028; C10M2205/0285; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/126; C10M2207/129; C10M2207/16; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10M2211/08; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/24; C10M2215/26; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2219/08; C10M2219/082; C10M2219/083; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2010/12; C10N2020/00; C10N2020/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A lubricating oil composition which comprises (A) 100 parts by weight of synthetic hydrocarbon lubricating oil, (B) 0.1 to 20 parts by weight of a load-withstanding additive and (C) 0.8 to 200 parts by weight of a liquid modified ethylene/α-olefin random copolymer comprising an ethylene/α-olefin random copolymer containing 30 to 75 mole % of ethylene graft-substituted by the residues of an unsaturated carboxylic acid of a derivative thereof, at a grafting ratio of 0.2 to 50 parts by weight of the unsaturated carboxylic acid or derivative thereof per 100 parts by weight of the ethylene/α-olefin random copolymer, the liquid graft-modified copolymer having an intrinsic viscosity [η], as measured in decalin at 135°C, in the range of from 0.01 to 0.3 dl/g and a molecular weight distribution ( Mw / Mn ), as determined by gel permeation chromatography, not larger than 4.
Claim 2
Dependent Claim
141 words
A lubricating oil composition which comprises (A) 100 parts by weight of synthetic hydrocarbon lubricating oil, (B) 0.1 to 20 parts by weight of a load-withstanding additive and (C) 0.8 to 200 parts by weight of a liquid modified ethylene/α-olefin random copolymer comprising an ethylene/α-olefin random copolymer containing 30 to 75 mole % of ethylene graft-substituted by the residues of an unsaturated carboxylic acid of a derivative thereof, at a grafting ratio of 0.2 to 50 parts by weight of the unsaturated carboxylic acid or derivative thereof per 100 parts by weight of the ethylene/α-olefin random copolymer, the liquid graft-modified copolymer having an intrinsic viscosity [η], as measured in decalin at 135°C, in the range of from 0.01 to 0.3 dl/g and a molecular weight distribution ( Mw / Mn ), as determined by gel permeation chromatography, not larger than 4.
Claim 3
Dependent Claim
27 words
A composition according to claim 1, wherein the additive (B) and the graft-modified copolymer (C) are incorporated at a (B)/(C) weight ratio of from 0.05 to 200.
Claim 4
Dependent Claim
24 words
A composition according to claim 1 or claim 2, wherein the lubricating oil (A) is a poly-α-olefin oil or an ethylene/α-olefin random copolymer oil.
Claim 5
Dependent Claim
34 words
A composition according to claim 3, wherein the lubricating oil (A) is an ethylene/α-olefin random copolymer oil and the graft modified copolymer (C) is a graft modification product of the ethylene/α-olefin random copolymer oil.
Claim 6
Dependent Claim
43 words
A composition according to any one of claims 1 to 4 wherein the graft-modified ethylene/α-olefin random copolymer (C) is a copolymer of ethylene and at least one α-olefin selected from propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicosane.
Claim 7
Dependent Claim
42 words
A composition according to any one of claims 3 to 5 wherein the lubricating oil (A) is a random copolymer of ethylene and at least one -olefin selected from propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicosane.
Claim 8
Dependent Claim
81 words
A composition according to any one of claims 1 to 6 wherein the copolymer (C) is graft-substituted by the residues of an unsaturated carboxylic acid or a derivative thereof selected from acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, bicyclo[2,2,1]hept-2-ene-5,6-dicarboxylic acid, maleic acid anhydride, itaconic acid anhydride, citraconic acid anhydride, tetrahydrophthalic acid anhydride, bicyclo[2,2,1]hept-2-ene-5,6-dicarboxylic acid anhydride, methyl acrylate, methyl methacrylate, dimethyl maleate, monomethyl maleate, diethyl fumarate, dimethyl itaconate, diethyl citraconate, dimethyl tetrahydrophthalate and dimethyl bicyclo[2,2,1]-hept-2-ene-5,6-dicarboxylate.
Claim 9
Dependent Claim
53 words
A composition according to any one of claims 1 to 7 comprising at least one additive (B) selected from oleic acid, stearic acid, oleyl alcohol, stearyl alcohol, palmitylalcohol, oleylamine, stearylamine and palmitylamine, dibutyldithio carbamic acid sulphide, dibenzyl sulphide, dibutyl phosphate, diphenyl phosphate, oleyl chloride, chlorinated paraffin, zinc dithiophosphate, molybdenum dithiophosphate and lead naphthenate.
Claim 10
Dependent Claim
31 words
A process for producing a composition according to any one of claims 1 to 8 which comprises admixing the lubricating oil (A), the load-withstanding additive (B) and the graft-modified copolymer (C).
Claim 11
Dependent Claim
45 words
A process according claim 9 comprising producing the graft-modified liquid ethylene/α-olefin random copolymer (C) by reacting an ethylene/α-olefin random copolymer having an ethylene content of from 30 to 75 mole % with an unsaturated carboxylic acid or derivative thereof as modifier and a graft-polymerisation initiator.
References Cited (Backward Citations)
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