| (19) |
 |
|
(11) |
EP 0 629 689 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.01.1995 Bulletin 1995/03 |
| (43) |
Date of publication A2: |
|
21.12.1994 Bulletin 1994/51 |
| (22) |
Date of filing: 07.06.1994 |
|
| (51) |
International Patent Classification (IPC)5: C10M 169/06
// (C10M169/06, 117:04, 143:12), C10N50:10 |
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT LU NL |
| (30) |
Priority: |
10.06.1993 US 75184
|
| (71) |
Applicant: EXXON RESEARCH AND ENGINEERING COMPANY |
|
Florham Park,
New Jersey 07932-0390 (US) |
|
| (72) |
Inventors: |
|
- Slack, David A.
Sarnia,
Ontario N7S 4W4 (CA)
- Stewart, David M.
Sarnia,
Ontario N7S 5C9 (CA)
|
| (74) |
Representative: Somers, Harold Arnold et al |
|
ESSO Engineering (Europe) Ltd.
Patents & Licences
Mailpoint 72
Esso House
Ermyn Way
Leatherhead,
Surrey KT22 8XE
Leatherhead,
Surrey KT22 8XE (GB) |
|
| |
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(57) A grease composition, having improved water resistance, adhesion and low temperature
pumpability properties, which comprises
(a) from 50 to 98 wt%, based on grease, of a lubricating oil;
(b) from 1 to 30 wt%, based on grease, of a thickener; and
(c) from 0.5 to 2.0 wt%, based on grease of polymer selected from either a defined
block copolymer of the structure A-B, or a hydrogenated star-shaped polymer having
a poly(divinylbenzene) nucleus and at least seven hydrogenated polyisoprene arms linked
to said nucleus.
The grease has an apparent viscosity of less than about 3500 poise (350 Pa.s) at 20
sec⁻¹.