Lubricating composition for two-cycle internal combustion engines
AssigneeExxon Research & Engineering Co.
InventorsA. Gordon Alexander, Alan G. Blahey
Life of this patent
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Abstract
Solvent-free lubricant compositions having improved lubricity properties comprising a basestock having a kinematic viscosity of about 1.5 to 3.0 cSt at 100.degree. C., about 3 to 15 wt % of bright stock having a kinematic viscosity about 20 to 40 cSt at 100.degree. C., about 3 to 15 wt % of a polyisobutylene having a number average molecular weight of about 400 to 1050 and about 3 to 15 wt % of a polyisobutylene having a number average molecular weight of about 1150 to 1650. Minor amounts of the lubricant composition may be incorporated into a distillate fuel to provide a lubricant oil-fuel composition for two-cycle engines.
Claims14
A solvent-free lubricant composition having improved lubricity properties for use in two-cycle internal combustion engines which comprises:
- (a) a major amount of a lubricant oil basestock, said basestock having a kinematic viscosity of about 1.5 to about 3.0 cSt at 100.degree. C.;
- (b) from about 3 to about 15 wt. %, based on lubricant composition of a bright stock having a kinematic viscosity of about 20 to 40 cSt at 100.degree. C.;
- (c) from about 3 to about 15 wt. %, based on lubricant composition of a polyisobutylene having a number average molecular weight of from about 400 to about 1050;
- and
- (d) from about 3 to about 15 wt. % of a polyisobutylene having a number average molecular weight of from about 1150 to about 1650;
- wherein said lubricant is characterized by having a minimum kinematic viscosity of about 4 cSt at 100.degree. C., a maximum kinematic viscosity of about 12 cSt at 100.degree. C. and a flash point greater than about 100.degree. C.
A lubricant oil-fuel composition having improved lubricity properties for use in a two-cycle internal combustion engine, said composition comprising:
- (A) a major amount of a distillate fuel;
- and
- (B) a minor amount of a solvent-free lubricant composition comprising:
- (a) a major amount of a lubricant oil basestock, said basestock having a kinematic viscosity of about 1.5 to about 3.0 cSt at 100.degree. C.;
- (b) from about 3 to about 15 wt. %, based on lubricant composition of a bright stock having a kinematic viscosity of about 20 to 40 cSt at 100.degree. C.;
- (c) from about 3 to about 15 wt. %, based on lubricant composition of a polyisobutylene having a number average molecular weight of from about 400 to about 1050;
- and
- (d) from about 3 to about 15 wt. % of a polyisobutylene having a number average molecular weight of from about 1150 to about 1650;
- wherein said lubricant is characterized by having a minimum kinematic viscosity of about 4 cSt at 100.degree. C., a maximum kinematic viscosity of about 12 cSt at 100.degree. C. and a flash point greater than about 100.degree. C.
Dependencies are inferred from the claim text.