Title:
改良された低温特性を潤滑油に賦与する粘性改良剤組成物
Document Type and Number:
Japanese Patent JP4840925
Kind Code:
B2
Abstract:
A lubricant composition comprising an oil of lubricating viscosity; (A) 0.05 to 1.5 percent by weight of a copolymer comprising 70 to 79 percent by weight of units derived from ethylene ("E"), having a weight-average molecular weight of 50,000 to 100,000, polydispersity less than 3, density ("D") of 860 to 896 kg/m<3>, and a melting point ("Tm") of 15 °C to 60 °C, wherein E and Tm fulfill the expression 3.44E - 206 >= Tm; and (B) 0.05 to 1.5 percent by weight of a block copolymer comprising a first block which comprises a vinyl aromatic comonomer and a second block which comprises a diene comonomer, the diene monomer-containing block being hydrogenated; wherein the weight ratio (A) : (B) is 20:80 to 60:40; exhibits good low temperature performance and durability.
Inventors:
Fan, cho
Bleon, lewis
Bleon, lewis
Application Number:
JP2006507465A
Publication Date:
December 21, 2011
Filing Date:
March 23, 2004
Export Citation:
Assignee:
THE LUBRIZOL CORPORATION
International Classes:
C10M157/00; C08F297/04; C08L23/16; C08L53/02; C10M143/12; C10M169/04; C08F210/16; C08L91/00; C10M101/02; C10M105/04; C10M143/04; C10N20/00; C10N20/04; C10N30/02; C10N40/25
Domestic Patent References:
| JPS4947401A | 1974-05-08 | |||
| JP2002529578A | 2002-09-10 | |||
| JPS59122595A | 1984-07-16 |
Foreign References:
| WO2000034420A1 | 2000-06-15 | |||
| WO2000060032A1 | 2000-10-12 | |||
| WO2002010276A2 | 2002-02-07 |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita