Lubricating oil additives
What is disclosed are methods for making polymer-in-oil solutions, useful for improving the viscosity-temperature relationship and low-temperature properties of lubricating oils when added thereto, which methods comprise polymerizing a methacrylic acid ester of an alcohol having 8 to 18 carbon atoms onto a polyolefin polymer of an olefinic hydrocarbon monomer having 2 to 4 carbon atoms in an oil solution of the polyolefin and ester monomers, then adding further polyolefin polymer to the solution and finally graft copolymerizing a polymerizable heterocyclic compound having a basic nitrogen atom in the ring thereof onto the resulting mixed polymers as backbone polymers or , in the alternative, separately graft copolymerizing a polymerizable heterocyclic compound having a basic nitrogen atom in the ring thereof onto a first backbone polymer which is itself a graft copolymer, in an oil solution, of a methacrylic acid ester of an alcohol having 8 to 18 carbon atoms on a polyolefin polymer of an olefinic hydrocarbon monomer having two to four carbon atoms and further graft copolymerizing a polymerizable heterocyclic compound having a basic nitrogen atom in the ring thereof onto a polyolefin polymer of the type described above and then combining the two graft copolymers thus formed to produce the desired polymer-in-oil solution.
- Assignee:
- Rohm Gmbh (Germany, Federal Republic Of)
- Patent Number(s):
- US 4229311
- OSTI ID:
- 6855775
- Country of Publication:
- United States
- Language:
- English
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