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 JP4427669
Kind Code:
B2
Abstract:
The present invention is intended to obtain a viscosity modifier for a lubricating oil, by the use of which a lubricating oil composition of excellent low-temperature properties can be obtained, and to obtain a lubricating oil composition of excellent low-temperature properties containing the viscosity modifier. The viscosity modifier for a lubricating oil comprises an ethylene/propylene copolymer (A) having the properties: the density is in the range of 857 to 882 kg/m<3>, Mw is in the range of 80,000 to 400,000, Mw/Mn is not more than 2.3, and the density (D (kg/m<3>)) and the melting point (Tm ( DEG C)) satisfy the relation Tm≤1.247xD-1037; or comprises an ethylene/propylene copolymer (B) having the properties: the ethylene content is in the range of 70 to 79 wt%, Mw is not less than 80,000 and less than 250,000, Mw/Mn is not more than 2.3, Tm is in the range of 15 to 60 DEG C, and the ethylene content (E (wt%)) and the melting point (Tm ( DEG C)) satisfy the relation 3.44xE-206≥Tm; or comprises an ethylene/propylene copolymer (C) having the properties: the ethylene content is in the range of 70 to 79 wt%, Mw is in the range of 250,000 to 400,000, Mw/Mn is not more than 2.3, Tm is in the range of 15 to 60 DEG C, and the ethylene content (E (wt%)) and the melting point (Tm ( DEG C)) satisfy the relation 3.44xE-204≥Tm. The lubricating oil composition comprises the ethylene/propylene copolymer (A) (B) or (C), a lubricating oil base (D), and if necessary, a pour point depressant.
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Inventors:
Kei Okada
Ryosuke Kinshige
Ryosuke Kinshige
Application Number:
JP2000586855A
Publication Date:
March 10, 2010
Filing Date:
December 08, 1999
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
C10M143/04; C10M157/00; C10M171/00; C10M177/00; C08F210/16; C10N20/00; C10N20/04; C10N30/02; C10N30/08
Domestic Patent References:
| JP60035009A | ||||
| JP7149963A | ||||
| JP62121710A |
Attorney, Agent or Firm:
Koji Makimura