Patent · US Expired

Process for graft copolymerization

US4338418A · kind A · utility

15Cited by

7References

6Claims

0Family size

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	Dec 15, 1980
Grant date	Jul 6, 1982
Priority date	—
Expiry date	Dec 15, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10M2217/06
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.