Title:
潤滑油用分散剤粘度指数改良剤の製造方法
Document Type and Number:
Japanese Patent JP4070027
Kind Code:
B2
Abstract:
A grafted polyolefin containing one or more of N-vinylimidazole, 4-vinylpyridine, or other ethylenically-unsaturated nitrogen-containing or oxygen-containing graftable monomers grafted to a polyolefin copolymer is disclosed. The grafted polyolefin preferably has a weight average molecular weight of from about 20,000 to about 500,000, a polydispersity of less than about 10, and an ADT value of at least about 8. The grafted polyolefin can be defined as containing more than about 1.2% by weight of grafted monomer on a polyolefin, or as containing at least about 13 moles of graftable monomers per mole of polyolefin, or as having an asphaltene dispersancy test (ADT) value of at least about 8. Also described is a lubricating oil comprising a lubricant base oil and a grafted polyolefin as described above. Also described is a method of making a dispersant viscosity index improver. N-vinyl-imidazole or other ethylenically unsaturated nitrogen-containing and/or oxygen-containing graftable monomers and a graftable polyolefin are reacted with enough of an initiator to graft the monomer to the polyolefin. The initiator and/or graftable monomer is added to the other ingredients, maintained at the reaction temperature, over a period of time. The reaction temperature is maintained at a level high enough to give acceptable reaction times. The N-vinylimidazole and the initiator each can be added at a uniform, relatively slow rate during the reaction.
Inventors:
Borden, Frederick, Jie
Sawell, Richard, Pee
Goldblatt, Irwin, El
McHenry, Mikle, Yi
Sawell, Richard, Pee
Goldblatt, Irwin, El
McHenry, Mikle, Yi
Application Number:
JP2004244614A
Publication Date:
April 02, 2008
Filing Date:
August 25, 2004
Export Citation:
Assignee:
CASTROL LIMITED
International Classes:
C08F255/02; C08F255/00; C08F255/04; C08F255/06; C08F255/08; C08F257/02; C08F279/02; C08L51/00; C08L51/06; C09K3/00; C10M143/00; C10M149/06; C10M149/10; C10M151/02; C10M157/04; C10M167/00; C10N30/04; C10N40/25
Domestic Patent References:
| JP3505344A | ||||
| JP1156312A | ||||
| JP54145787A | ||||
| JP61250013A | ||||
| JP6172422A | ||||
| JP59093710A |
Attorney, Agent or Firm:
Masami Sakai