Polymers bearing groups derived from n-substituted lactams and their use as lubricating oil additives
Novel lubricating oil polymer additives are obtained by the following: (1) by preparing, by anionic polymerization, a living diene polymer of mn of between about 20,000 and 300,000; (2) by functionalizing the said polymer by means of an nsubstituted lactam of the type of n-alkylcaprolactam, nbinylcaprolactam, and particularly of the type of nalkylpyrrolidione and n-vinylpyrrolidone; and (3) by hydrogenating the said functionalized polymer. A variant method of preparing the said polymers comprises subjecting the living polymer to a metalation operation before functionalization; the hydrogenation operation is carried out before metalation or after functionalization. The said polymers may be used as additives which improve the viscosity index and the dispersing power of lubricating oils. The amount of additive added is between about 0.1 and 10 percent by weight.
- Assignee:
- Institut Francais Du Petrole (France); Rhone-Poulenc Industries (France)
- Patent Number(s):
- US 4222882
- OSTI ID:
- 6668726
- Resource Relation:
- Patent File Date: Filed date 26 Jan 1979
- Country of Publication:
- United States
- Language:
- English
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