C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 143/00 (2006.01) C10M 129/40 (2006.01) C10M 155/00 (2006.01) C10M 169/06 (2006.01)
Patent
CA 2124497
- 20 - ABSTRACT OF THE DISCLOSURE 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 the group consisting of (1) a block copolymer of the structure A-B where A is a polymer block comprising at least about 75 percent by weight of condensed styrene units, no more than 25 percent of the aromatic unsaturation in said block being reduced by hydrogenation and B is hydrogenated polymer block comprising, prior to hydrogenation, at least 75 percent by weight of condensed isoprene units, at least 95 percent of the olefinic unsaturation in said block being reduced by hydrogenation, and (2) a hydrogenated star-shaped polymer having a poly(divinylbenzene) nucleus and at least seven hydrogenated poly- isoprene arms linked to said nucleus; wherein the grease has an apparent viscosity of less than about 3500 poise at 20 sec-1.
Slack David Anthony
Stewart David Morris
Borden Ladner Gervais Llp
Imperial Oil
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