VISCOSITY REGULATOR FOR LUBRICATING OIL AND LUBRICATING OIL COMPOSITION

Title:

VISCOSITY REGULATOR FOR LUBRICATING OIL AND LUBRICATING OIL COMPOSITION

Document Type and Number:

WIPO Patent Application WO/2000/060032

Kind Code:

A1

Abstract:

A lubricant composition characterized in that it comprises a lubricating oil base (A) and an ethylene/C¿3-20? $g(a)-olefin copolymer (B), that the content of the copolymer (B) is 1 to 20 wt.%, and that the copolymer (B) has the following properties: (1) the ethylene content (E) is 40 to 77 wt.%, (2) the weight-average molecular weight (Mw) in terms of polystyrene as determined by GPC is 80,000 to 400,000, (3) Mw/Mn is 2.4 or lower, (4) the melting point (Tm) as measured by DSC is 60°C or lower, (5) the ethylene content (E, wt.%) and the melting point (Tm, °C) as measured by DSC satisfy the following relationship (I): 3.31 x E - 186 $m(G) Tm and (6) the proportion of $g(a)- and $g(b)-carbon atoms (V, %) in the carbon atoms of the backbone and of the long-chain branch(es) if present and the ethylene content (E, wt.%) satisfy the following relationship (II): V $m(F) 10 - 0.1 x E (II)

Inventors:

OKADA KEIJI (JP)
KANESHIGE RYOUSUKE (JP)

Application Number:

PCT/JP2000/001902

Publication Date:

October 12, 2000

Filing Date:

March 28, 2000

Export Citation:

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Assignee:

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

International Classes:

C10M143/02; C08F210/16; (IPC1-7): C10M143/00

Foreign References:

JPH03131612A	1991-06-05
EP0420436A1	1991-04-03
EP0887355A1	1998-12-30
JPH06192327A	1994-07-12
JPH05148317A	1993-06-15
JPS63309592A	1988-12-16

Other References: