Hydrocarbon compositions containing polyolefin graft polymers
AssigneeTexaco Inc.
InventorsMaria M. Kapuscinski, Christopher S. Liu, William P. Hart, Larry D. Grina
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Abstract
Lubricants of improved properties contain ethylene-propylene copolymers bearing graft units derived from, as a functional monomer, the reaction product of (i) an unsaturated aldehyde or ketone and (ii) a primary or secondary amine which contains at least one nitrogen atom in a heterocyclic ring.
Claims45
A graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone polymer having graft polymerized thereon units derived from, as a functional monomer, the reaction product of (i) an unsaturated aldehyde or ketone and (ii) a primary or secondary amine which contains at least one nitrogen atom in a heterocyclic ring.
A graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone polymer of molecular weight M.sub.n of 10,000-1,000,000 selected from ethylene-propylene or from ethylene-propylene-third monomer backbone polymers, said backbone polymer having graft polymerized thereon units derived from the functional monomer formed from (i) crotonaldehyde and (ii) N-methyl piperazine or pyrrolidine or N-(3-aminopropyl)morpholine or 1-(3-aminopropyl)-2-pipecoline.
The process for preparing a graft polymer which comprises
- intimately admixing in a reaction mixture a free radical initiator and (i) an oil-soluble, substantially linear, carbon-carbon backbone polymer, and (ii), as a functional monomer, the reaction product of (i) an unsaturated aldehyde or ketone and (ii) a primary or secondary amine which contains at least one nitrogen atom in a heterocyclic ring,
- maintaining the temperature of the reaction mixture at a temperature at least as high as the decomposition temperature of said initiator thereby effecting decomposition of said initiator and graft polymerization of said functional monomer onto said backbone polymer to form graft polymer;
- and
- recovering said graft polymer.
The process for preparing a graft polymer which comprises
- initially admixing in a reaction mixture (i) an oil-soluble, substantially linear, carbon-carbon backbone polymer of molecular weight M.sub.n of 10,000-1,000,000 selected from ethylene-propylene or from ethylene-propylene-third monomer backbone polymers, (ii) as functional monomer the reaction product of crotonaldehyde and N-methyl piperazine, pyrrolidine, N-(3-aminopropyl)morpholine or 1-(3-aminopropyl)-2-pipecoline, and (iii) a free radical initiator;
- maintaining the temperature of the reaction mixture or a temperature at least as high as the decomposition temperature of said initiator thereby effecting decomposition of said initiator and graft polymerization of said functional monomer onto said backbone polymer to form graft polymer;
- and
- recovering said graft polymer.
A lubricating oil composition containing a major portion of a lubricating oil and a minor effective viscosity index improving amount of a graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone polymer having graft polymerized thereon units derived from, as a functional monomer, the reaction product of (i) an unsaturated aldehyde or ketone and (ii) a primary or secondary amine which contains at least one nitrogen atom in a heterocyclic ring.
A lubricating oil composition containing a major portion of a lubricating oil and a minor effective viscosity index improving portion of 0.2-5 w% of a graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone polymer having graft polymerized thereon units derived from, as a functional monomer, the reaction product of (i) an unsaturated aldehyde or ketone and (ii) a primary or secondary amine which contains at least one nitrogen atom in a heterocyclic ring.
Dependencies are inferred from the claim text.