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US 5,498,353 AGranted
Semi-synthetic two-stroke engine oil formulation
AssigneeChinese Petroleum Corporation
InventorsRon-Sheng Lin, Chen-Yi Lin, Tsae-Shycm Lee, Chi-Chung Chen, Su-Terng Chang, Kuo-Min Wei
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Abstract
A semi-synthetic two-stroke engine oil formulation which comprises a base oil consisting of a high-viscosity mineral oil, a medium-viscosity mineral oil, a solvent and a mixture of three polyisobutylenes with different molecular weights, and appropriate detergents and dispersants. This semi-synthetic two-stroke engine has both high lubricity and high detergency, and also meets the requirements of low smoke and low exhaust system blocking.
Claims3
A semi-synthetic two-stroke engine oil comprising the following components:
- a mineral base oil selected from the group consisting of a medium-viscosity mineral oil (MN) having a viscosity of about 4-8 cSt at 100.degree. C., a high-viscosity mineral oil (HN) having a viscosity of about 10-15 cSt at 100.degree. C., and a mixture of said medium-viscosity mineral oil and said high-viscosity mineral oil;
- wherein the amount of the high-viscosity mineral oil is from about 0 to 20% and the medium-viscosity mineral oil is from about 10 to 50%.
- 5-30% by weight of kerosene as the solvent;
- 2-12% by weight of detergents and dispersants;
- and
- a mixture of three polyisobutylenes comprising, based on the total weight of the two-stroke engine oil, 5-30% by weight of a first polyisobutylene with a molecular weight of from 900 to 1000, 5-30% by weight of a second polyisobutylene with a molecular weight of from 400 to 500 and 2-10% by weight of a third polyisobutylene with a molecular weight of from 1200 to 1400.
3 more elements
Dependencies are inferred from the claim text.