Title:
【発明の名称】ポリマー状粘度指数向上剤
Document Type and Number:
Japanese Patent JP3058370
Kind Code:
B2
Abstract:
The invention provides cyclone-finishable polymeric viscosity index improvers, produced by the process comprising the steps of: (a) preparing by anionic polymerisation a copolymer having a number average molecular weight in the range from 125,000 to 275,000, an isoprene content from 90 to 98 per cent by weight, wherein at least 85% of the isoprene units have a 1,4-configuration, and a monoalkenyl aromatic hydrocarbon content from 10 to 2 per cent by weight; and comprising a block structue A-A/B wherein A is a homopolymer block of the isoprene and A/B is a copolymer block of the isoprene and the monoalkenyl aromatic hydrocarbon, the homopolymer block A comprising at least 60% of the copolymer by weight; and (b) hydrogenating at least 95% of the isoprene and at least 5% of the monoalkenyl aromatic hydrocarbon; a process for their preparation; and oil compositions containing them. e
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Inventors:
Robert Barnett Rhodes
Harvey Emerson Attood
Harvey Emerson Attood
Application Number:
JP1030292A
Publication Date:
July 04, 2000
Filing Date:
January 23, 1992
Export Citation:
Assignee:
Ciel International Research Mart Shats Pay BV
International Classes:
C08F8/04; C08F297/04; C10M143/12; C10M143/10; C10N20/04; C10N30/02; C10N60/02; C10N70/00; (IPC1-7): C10M143/12
Domestic Patent References:
| JP1149899A | ||||
| JP4947401A | ||||
| JP52121008A |
Attorney, Agent or Firm:
Yoshio Kawaguchi (3 outside)