Title:
潤滑油用粘度調整剤および潤滑油組成物
Document Type and Number:
Japanese Patent JP4359807
Kind Code:
B2
Abstract:
This invention aims to provide lubricating oil compositions excellent in low-temperature properties, oxidation stability, lubricity at high temperatures and fuel efficiency and also in handling properties at low temperatures, and a viscosity modifier for lubricating oil employable in said lubricating oil compositions. The viscosity modifier for lubricating oil comprises an ethylene/ alpha -olefin copolymer (B) composed of: (i) ethylene, (ii) an alpha -olefin of 3 or more carbon atoms, and (iii) a higher alpha -olefin of 4 to 20 carbon atoms wherein the carbon number of (iii) is larger than that of (ii) by one or more, and the ethylene/ alpha -olefin copolymer (B) has the following properties (b-1) and (b-2): (b-1) a content of ethylene (i) is in the range of 40 to 80 % by weight, a content of the alpha -olefin of 3 or more carbon atoms (ii) is in the range of 15 to 59 % by weight, and a content of the higher alpha -olefin of 4 to 20 carbon atoms (iii) is in the range of 0.1 to 25 % by weight with the proviso that the sum is 100 % by weight; and (b-2) a weight-average molecular weight (Mw) in terms of polystyrene as measured by GPC is between 80,000 and 400,000.
Inventors:
Kei Okada
Ryosuke Kinshige
Ryosuke Kinshige
Application Number:
JP2001582470A
Publication Date:
November 11, 2009
Filing Date:
May 10, 2001
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
C10M143/06; C08F210/16; C10M143/00; C10M143/08; C10M157/00; C08F4/659; C10N20/00; C10N20/04; C10N30/02; C10N30/08; C10N30/10; C10N40/25
Domestic Patent References:
| JP47000177A | ||||
| JP2000191855A | ||||
| JP2000198892A | ||||
| JP2000191857A |
Foreign References:
| WO1998058978A1 | ||||
| WO1998058972A1 |
Attorney, Agent or Firm:
Koji Makimura