Lubricating oil containing dispersant viscosity index improver
AssigneeTexaco Inc.
InventorsWilliam P. Hart, Christopher S. Liu
Life of this patent
Estimating the term…
Abstract
Lubricating oil of improved dispersancy and viscosity index contains ethylene-propylene polymer bearing glycidyl methacrylate graft which as been functionalized with mercaptoacetic acid.
Claims19
A polymer comprising
- (i) a carbon-carbon backbone containing residual unsaturation;
- and graft polymerized thereon
- (ii) a first reactant containing ethylenic unsaturation and an epoxide moiety;
- thereby forming a graft polymer said graft polymer being derivatized with
- (iii) a second reactant containing at least one --SH group and at least one --COOH group.
A polymer comprising moieties derived from
- (i) at least one ethylenically unsaturated polymerizable monomer C.dbd.CA wherein A is hydrogen, halogen, acyloxy or a hydrocarbon selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl and alkenyl;
- (ii) a first reactant containing ethylenic unsaturation and an epoxide moiety of the formula ##STR3## wherein C.dbd.C is an ethylenically unsaturated double bond;
- R.sup.v and R.sup.vi are each independently a divalent hydrocarbon moiety selected from the group consisting of alkylene, alkarylene, aralkylene, cycloalkylene, and arylene;
- R' is hydrogen, alkyl, alkaryl, aralkyl, cycloalkyl, or aryl;
- R" is a divalent moiety selected from the group consisting of --COO-- and --R.sup.v ;
- a is an integer greater than 0;
- b is 0 or 1;
- c is an integer 1-3;
- and
- d is 0 or 1;
- and
- (iii) a second reactant HSR'"COOH wherein R'" is independently selected from the same group as that from which R.sup.v is selected.
A polymer comprising a copolymer of ethylene-propylene or ethylene-propylene-diene third monomer bearing moieties graft polymerized thereon derived from glycidyl methacrylate, said polymer having been after treated with mercaptoacetic acid.
A lubricating composition comprising a major portion of a lubricating oil and a minor effective viscosity index improving portion of a polymer comprising
- (i) a carbon-carbon backbone containing residual unsaturation;
- and graft polymerized thereon to form graft polymer
- (ii) a first reactant containing ethylenic unsaturation and an epoxide moiety;
- thereby forming a graft polymer said graft polymer being derivatized with
- (iii) a second reactant containing at least one --SH group and at least one --COOH group.
A lubricating composition comprising a major portion of a lubricating oil and a minor effective viscosity-index improving portion of 0.1-20 w % of a polymer comprising moieties derived from
- (i) at least one ethylenically unsaturated polymerizable monomer C.dbd.CA wherein A is hydrogen, halogen, acyloxy or a hydrocarbon selected from the group consisting of alkyl, cycloalkyl, aralkyl, alkaryl, aryl and alkenyl
- (ii) a first reactant containing ethylenic unsaturation and an epoxide moiety of the formula ##STR4## wherein C.dbd.C is an ethylenically unsaturated double bond;
- R.sup.v and R.sup.vi are each independently a divalent hydrocarbon moiety selected from the group consisting of alkylene, alkarylene, aralkylene, cycloalkylene, and arylene;
- R' is hydrogen, alkyl, alkaryl, aralkyl, cycloalkyl, or aryl;
- R" is a divalent moiety selected from the group consisting of --COO-- and R.sup.v ;
- a is an integer greater than 0;
- b is 0 or 1;
- c is an integer 1-3;
- and
- d is 0 or 1;
- and
- (iii) a second reactant HSR'" COOH wherein R'" is independently selected from the same group as that from which R.sup.v is selected.
A lubricating composition comprising a major portion of a lubricating oil and a minor effective viscosity-index improving portion of 0.1-20 w % of a polymer comprising a copolymer of ethylene-propylene or ethylene-propylene-diene third monomer bearing moieties graft polymerized thereon derived from glycidyl methacrylate, said polymer having been after treated with mercaptoacetic acid.
Dependencies are inferred from the claim text.