Title:
【発明の名称】分散剤粘度指数改良剤
Document Type and Number:
Japanese Patent JP2001501653
Kind Code:
A
Abstract:
A dispersant viscosity index improver linear diblock copolymer or radial or star block copolymer, wherein the linear diblock copolymer and each arm of the radial or star block copolymer, respectively, has an overall number average molecular weight of 7500 to 250,000 and comprises a block of a conjugated diene having a number average molecular weight of 5000 to 200,000 and a block of a vinyl aromatic hydrocarbon having a number average molecular weight of 2500 to 100,000, the copolymer having a vinyl aromatic hydrocarbon content of 5 to 50 weight percent, wherein 5 to 10 N-vinyl imidazole functional groups per polymer chain have been grafted on to the copolymer, a process for producing and lubricating oil compositions and additive concentrates containing such dispersant viscosity index improvers.
Inventors:
Sutherland, Robert, Youth
Application Number:
JP51526798A
Publication Date:
February 06, 2001
Filing Date:
September 23, 1997
Export Citation:
Assignee:
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BESLOTEN VENNOOTSHAP
International Classes:
C08F8/30; C08F287/00; C08F297/04; C08L51/00; C10M149/10; C10M161/00; C10N20/06; (IPC1-7): C08F287/00; C08F297/04; C08L51/00; C10M149/10
Attorney, Agent or Firm:
Kawahara Kazuho