VISCOSITY MODIFIER FOR LUBRICATING OIL AND LUBRICATING OIL COMPOSITION

Title:

VISCOSITY MODIFIER FOR LUBRICATING OIL AND LUBRICATING OIL COMPOSITION

Document Type and Number:

WIPO Patent Application WO/2000/034420

Kind Code:

A1

Abstract:

A viscosity modifier for lubricating oils which is capable of giving a lubricating oil composition excellent in low-temperature properties; and a lubricating oil composition which contains the viscosity modifier and has excellent low-temperature properties. The modifier comprises: an ethylene/propylene copolymer (A) which has a density of 857 to 882 kg/m?3¿, an Mw of 80,000 to 400,000, and an Mw/Mn of 2.3 or lower and in which the density (D: kg/m?3¿) and the melting point (Tm: °C) satisfy the relationship Tm=1.247xD-1037; an ethylene/propylene copolymer (B) which has an ethylene content of 70 to 79 wt.%, an Mw of 80,000 to 250,000, excluding 250,000, an Mw/Mn of 2.3 or lower, and a Tm of 15 to 60 °C and in which the ethylene content (E: wt.%) and the melting point (Tm: °C) satisfy the relationship 3.44xE-206=Tm; or an ethylene/propylene copolymer (C) which has an ethylene content of 70 to 79 wt.%, an Mw of 250,000 to 400,000, an Mw/Mn of 2.3 or lower, and a Tm of 15 to 60 °C and in which the ethylene content (E: wt.%) and the melting point (Tm: °C) satisfy the relationship 3.44xE-204=Tm. The composition comprises a combination of any of the ethylene/propylene copolymers (A), (B), and (C) with a lube base oil (D) and optionally contains a pour point depressant (E).

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Inventors:

OKADA KEIJI (JP)
KANESHIGE RYOUSUKE (JP)

Application Number:

PCT/JP1999/006868

Publication Date:

June 15, 2000

Filing Date:

December 08, 1999

Export Citation:

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Assignee:

MITSUI CHEMICALS INC (JP)
LUBRIZOL CORP (US)
OKADA KEIJI (JP)
KANESHIGE RYOUSUKE (JP)

International Classes:

C10M143/04; C10M157/00; C10M171/00; C10M177/00; (IPC1-7): C10M143/04

Foreign References:

EP0129414B1	1990-10-31
EP0638611A1	1995-02-15
EP0200351B1	1991-03-13

Other References: