Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1998-05-14
1999-10-12
Medley, Margaret
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
508465, 508539, 508577, 508591, 44363, 44395, 44459, C10M11104, C10M16904, C10M15918, C10L 114
Patent
active
059654988
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a lubricant composition useful as a two-cycle oil. More particularly the invention relates to two-cycle synthetic oil which complies with certain test standards for land equipment, gasoline fueled, two-cycle engines, such as motorcycle engines, moped engines, snowmobile engines, lawn mower engines and the like. Two-stroke-cycle gasoline engines now range from small, less than 50 cc engines, to higher performance engines of 200 to 500 cc. The development of such high performance engines has created the need for new two-cycle oil standards and test procedures. The present composition exhibits improved detergency and smoke reduction characteristics.
Two-cycle engines are lubricated by mixing the fuel and lubricant and allowing the mixed composition to pass through the engine. Various types of two-cycle oils, compatible with fuel, have been described in the art. Typically, such oils contain a variety of additive components in order for the oil to pass industry standard tests to permit use in two-cycle engines.
Canadian Patent 1,238,448 (1988) discloses the copolymers of alpha olefins with dicarboxylic esters which are used as one component of the composition of the present invention.
U.S. Pat. No. 4,994,196 (1991) discloses two-cycle engine oils comprising the same alpha olefin dicarboxylic ester copolymers in combination with esters of pentaerythritol and calcium phenate.
U.S. Pat. No. 5,378,249 (1995) discloses biodegradable two-cycle engine oil compositions which comprise 20-80% of a heavy ester having a viscosity of at least 7 cSt at 100.degree. in combination with 10-85 weight percent of a light ester oil having a viscosity less than 6.0 cSt at 100.degree..
U.S. Pat. No. 5,171,461 (1992) discloses lubricating compositions containing a combination of a sulfur compound with an oil soluble or dispersable source of copper to provide lubricating oils which exhibit improved anti-oxidant and extreme pressure properties.
U.S. Pat. No. 4,664,822 (1987) discloses metal containing lubricant compositions which contain copper overbased materials which act as a dispersant/detergent and an oxidation and corrosion inhibitor.
U.S. Pat. No. 4,867,890 discloses lubricating oil compositions containing very small proportions, that is, 5-500 parts per million of copper as an antioxidant.
The present invention is based on the discovery that the use of oil soluble copper carboxylate in synthetic ester based two-cycle oil formulations provides lubricants which exhibit improvements in smoke generation and detergency, as measured by two-cycle engine tests.
Accordingly, there has been discovered a two-cycle lubricating oil composition comprising: copolymer of an alpha-olefin with an ester of a dicarboxylic acid, the oil having a viscosity of 20 to 50 cSt at 100.degree. C.; alcohol ester of a dicarboxylic acid, the oil having a viscosity of 3 to 10 cSt at 100.degree. C.; polyisobutylene or a mixture of polybutenes and polyisobutylenes having a number average molecular weight of about 300 to 1500; of up to 300.degree. C.;
e) 0.2 to 2% by weight of an oil soluble copper compound; and
This invention also comprises the use of the foregoing oil in a two-cycle engine.
The first synthetic ester component is known in the art and is a copolymer of an alpha olefin with a dicarboxylic acid ester. Such fluid copolymers are typically prepared from alpha olefins having 3 to 20 carbon atoms, more preferably 6 to 18 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1octene and the like. Examples of suitable dicarboxylic acids for preparing such materials include maleic acid, fumaric acid, citraconic acid, mesaconic acid and itaconic acid. The alcohol is preferably one having 1 to 20 carbon atoms, more preferably 3 to 8 carbon atoms such as methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol and the like. This material is prepared by copolymerizing the above described alpha olefin with the above described ester of dicarboxylic acid. Preferred is a b
REFERENCES:
patent: 4664822 (1987-05-01), Hunt et al.
patent: 4867890 (1989-09-01), Colclough et al.
patent: 4994196 (1991-02-01), Kugaya et al.
patent: 5171461 (1992-12-01), Di Biase
patent: 5378249 (1995-01-01), Morrison
Exxon Chemical Patents Inc
Medley Margaret
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