Process for graft copolymerization

US4281081A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Heinz Jost · Seeheim-Jugenheim, DE
• Hellmuth Knoell · Reichenbach, DE
• Gerhard Markert · Ober-Ramstadt, DE
• Horst Pennewiss · Darmstadt, DE

Key dates

• Filing date: Feb 1, 1979
• Grant date: Jul 28, 1981
• Expiry date: Feb 1, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M2217/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

What is disclosed are the method of making a lubricating-oil additive which improves the viscosity index and has a dispersing and detergent action, which method comprises graft copolymerizing, onto an oil-soluble base polymer, from 0.5 to 10 parts of a polymerizable lactam together with 0.1 to 3 parts of a polymerizable N-heterocyclic compound, said parts being by weight of said base polymer, and the lubricating-oil additives so produced.