EP 0767236 A1 19970409 - Friction modification of synthetic gear oils
Title (en)
Friction modification of synthetic gear oils
Title (de)
Modifizierung der Reibung synthetischer Getriebeöle
Title (fr)
Modification de la friction d'huiles synthétiques pour engrenages
Publication
Application
Priority
GB 9520295 A 19951004
Abstract (en)
Gear lubricant compositions having a kinematic viscosity at 100 DEG C in the range of 4 to 32 mm<2>.s<-1> (cSt), and comprise (a) a base oil having (i) more than 20% by volume of hydrogenated poly- alpha -olefin oil and (ii) less than 80% by volume of mineral oil or synthetic ester oil or a combination thereof; (b) an amount of an additive package such that the lubricant satisfies or exceeds the specifications for API GL-4 service; and (c) a friction improving amount in the range of 0.01 to 2 wt% based on the total weight of the lubricant of at least one overbased alkaline earth metal sulphurised phenate or salicylate, the lubricant being essentially free of any metal additive component other than said phenate or salicylate, and has on a weight basis a boron content, if any, of not more than 1,000 ppm.
IPC 1-7
IPC 8 full level
C10M 169/04 (2006.01)
CPC (source: EP)
C10M 101/02 (2013.01); C10M 105/36 (2013.01); C10M 107/10 (2013.01); C10M 159/22 (2013.01); C10M 169/042 (2013.01); C10M 2203/1006 (2013.01); C10M 2203/1025 (2013.01); C10M 2203/1045 (2013.01); C10M 2203/1065 (2013.01); C10M 2203/1085 (2013.01); C10M 2205/00 (2013.01); C10M 2205/02 (2013.01); C10M 2205/028 (2013.01); C10M 2205/0285 (2013.01); C10M 2207/028 (2013.01); C10M 2207/262 (2013.01); C10M 2207/281 (2013.01); C10M 2207/282 (2013.01); C10M 2207/2825 (2013.01); C10M 2207/283 (2013.01); C10M 2207/2855 (2013.01); C10M 2207/286 (2013.01); C10M 2207/34 (2013.01); C10M 2209/111 (2013.01); C10M 2219/087 (2013.01); C10M 2219/088 (2013.01); C10M 2219/089 (2013.01); C10N 2020/01 (2020.05); C10N 2040/04 (2013.01); C10N 2040/042 (2020.05); C10N 2040/044 (2020.05); C10N 2040/046 (2020.05)
Citation (search report)
- [X] US 5250122 A 19931005 - UCHIDA HITOSHI [JP], et al
- [Y] EP 0578435 A1 19940112 - ETHYL PETROLEUM ADDITIVES LTD [GB]
- [Y] EP 0501527 A1 19920902 - LUBRIZOL CORP [US]
- [Y] EP 0620268 A1 19941019 - ETHYL PETROLEUM ADDITIVES LTD [GB]
- [A] EP 0531585 A1 19930317 - ETHYL PETROLEUM ADDITIVES LTD [GB]
- [A] WO 8705927 A2 19871008 - LUBRIZOL CORP [US]
- [A] US 5089156 A 19920218 - CHRISOPE DOUGLAS R [US], et al
Designated contracting state (EPC)
BE DE FR GB
DOCDB simple family (publication)
EP 0767236 A1 19970409; EP 0767236 B1 20010627; BR 9603949 A 19980609; DE 69613528 D1 20010802; DE 69613528 T2 20020418; GB 9520295 D0 19951206
DOCDB simple family (application)
EP 96300983 A 19960213; BR 9603949 A 19960930; DE 69613528 T 19960213; GB 9520295 A 19951004