Title:
【発明の名称】C▲下1▼▲下4▼―カルボキシレートポリマー及び粘度指数向上剤含有油性組成物
Document Type and Number:
Japanese Patent JP2882486
Kind Code:
B2
Abstract:
A lubricating oil composition comprising lubricating oil and (i) an amount effective to improve the low temperature flow properties of said lubricating oil composition of additive consisting essentially of at least one low molecular weight polymer or interpolymer of unsaturated carboxy ester represented by the formula wherein R min is selected from the group consisting of hydrogen and COOR, and R is a C14 alkyl group; and (ii) an amount effective to improve the viscosity index of said lubricating oil composition of additive comprising copolymer of ethylene and at least one other alpha-olefin monomer, said copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethylene-alpha-olefin copolymer segment, wherein said at least one crystallizable segment comprises at least about 10 weight percent of said copolymer chain and contains an average ethylene content of at least about 57 weight percent, wherein said low crystallinity segment contains an average of not greater than about 53 weight percent ethylene, and wherein said copolymer has a molecular weight distribution characterized by at least one of a ratio of Mw/Mn of less than 2 and a ratio of Mz/Mw of less than 1.8, and wherein at least two portions of an individual intramolecularly heterogeneous chain, each portion comprising at least 5 weight percent of said chain, differ in composition from one another by at least 7 weight percent ethylene.
Inventors:
ARUBAATO ROTSUSHI
SERIO ROOZENTARU
SERIO ROOZENTARU
Application Number:
JP4602290A
Publication Date:
April 12, 1999
Filing Date:
February 28, 1990
Export Citation:
Assignee:
EKUSON CHEM PATENTSU INC
International Classes:
C10M143/02; C10M145/14; C10M157/00; C10N20/00; C10N20/04; C10N30/02; C10N40/25; (IPC1-7): C10M143/02; C10M145/14
Domestic Patent References:
| JP57205493A | ||||
| JP4742723B1 |
Other References:
【文献】欧州公開296714(EP,A1)
Attorney, Agent or Firm:
Motohiro Kurauchi (1 outside)