Lubricating oil containing dispersant viscosity index improver
AssigneeTexaco Inc.
InventorsChristopher S. Liu, William P. Hart, Maria M. Kapuscinski
Life of this patent
Estimating the term…
Abstract
Lubricating oils of improved properties contain a terpolymer of glycidyl methacrylate, lauryl methacrylate, and stearyl methacrylate which has been functionalized or coupled with phenothiazine and with N-methyl piperazine.
Claims37
The method of preparing a functionalized polymer which comprises
- copolymerizing, under free radical polymerization conditions, (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties thereby forming a copolymer of molecular weight M.sub.n of 10,000-1,000,000 containing at least two pendant side chains containing epoxide moieties;
- functionalizing a first portion of said side chains containing epoxide moieties with first functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom;
- functionalizing a second portion of said side chains containing epoxide moieties with, as second functionalizating agent, a primary or secondary functionalizing polyamine thereby forming a dually functionalized product polymer;
- and
- recovering said dually functionalized product polymer.
The method of preparing a functionalized polymer which comprises
- copolymerizing, under free radical polymerization conditions, (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties thereby forming a copolymer of molecular weight Mn of 10,000-1,000,000 containing at least two pendant side chains containing epoxide moieties;
- functionalizing a portion of said side chains containing epoxide moieties with first functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom thereby forming a functionalized product polymer;
- and;
- recovering said functionalized product polymer.
The method of preparing a functionalized polymer which comprises
- copolymerizing, under free radical polymerization conditions, (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties thereby forming a copolymner of molecular weight Mn of 10,000-1,000,000 containing at least two pendant side chains containing epoxide moieties;
- functionalizing a portion of said side chains containing epoxide moieties with, as second functionalizing agent, a primary or secondary functionalizing polyamine thereby forming a functionalized product polymer;
- and
- recovering said functionalized product polymer.
A functionalized polymer comprising moieties derived from (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties, said polymer backbone bearing at least two pendant side chains containing epoxide moieties, a first portion of said side chains containing epoxide moieties having been functionalized with first functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom, and a second portion of said side chains containing epoxide moieties having been functionalized with, as second functionalizing agent, a primary or secondary functionalizing polyamine.
A functionalized polymer comprising moieties derived from (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties, said polymer backbone bearing at least two pendant side chains containing epoxide moieties, at least a portion of said side chains containing epoxide moieties having been functionalized with functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom.
A functionalized polymer comprising moieties derived from (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties, said polymer backbone bearing at least two pendant side chains containing epoxide moieties, at least a portion of said side chains containing epoxide moieties having been functionalized with, as second functionalizing agent, a primary or secondary polyamine.
A composition comprising a functionalized polymer comprising moieties derived from (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties, said polymer side chains containing epoxide moieties, a first portion of said side chains containing epoxide moieties having been functionalized with first functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom, and a second portion of said side chains containing epoxide moieties having been functionalized with functionalizing agent, containing at least one sulfur atom and at least one hetero nitrogen atom;
- and
- an inert diluent-solvent.
A lubricating oil composition comprising a major portion of a lubricating oil and a minor effective viscosity index improving portion of, as additive, a functionalized polymer comprising moieties derived from (i) first monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and an epoxide moiety and (ii) second monomer containing a copolymerizable ethylenically unsaturated carbon-carbon double bond and which is free of epoxide moieties, said polymer backbone bearing at least two pendant side chains containing epoxide moieties, a first portion of said side chains containing epoxide moieties having been functionalized with first functionalizing agent containing at least one sulfur atom and at least one hetero nitrogen atom, and a second portion of said side chains containing epoxide moieties having been functionalized with, as second functionalizing agent, a primary or secondary functionalizing polyamine.
A lubricating oil composition comprising a major portion of a lubrication oil and 0.2-5 w% of a functionalized polymer containing moieties derived from glycidyl methacrylate and lauryl methacrylate and stearyl methacrylate, said polymer having been functionalized with phenothiazine and N-methyl piperazine.
Dependencies are inferred from the claim text.