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US 6,649,574 B2Granted
Biodegradable non-toxic gear oil
AssigneeExxonMobil Research and Engineering Company
InventorsAngeline Baird Cardis, Susan Ardito
Life of this patent
Estimating the term…
Abstract
A biodegradable lubricating oil composition especially useful as a gear oil employs a synthetic alcohol ester basestock formed from mono- and dipentaerythritol with certain mono- and dicarboxylic acids or dicarboxylic acid anhydrides and an effective amount of a polyoxyalkylene alcohol demulsifying agent, a combination of alkylated organic acid and ashless succinimide rust inhibitors and an ashless dithiocarbamate antiwear and extreme pressure agent.
Claims10
A biodegradable lubricating oil composition comprising:
- (A) a major amount of one or more biodegradable synthetic alcohol ester basestocks formed from the reaction product of:
- (1) mono- and dipentaerythritol and (2) mixed acids comprising about 2 to 40 mole % linear monocarboxylic acids having from about 5 to about 12 carbon atoms, about 30 to about 70 wt % of a branched monocarboxylic acid having from about 15 to about 20 carbon atoms and from about 20 to about 30 mole % of a dicarboxylic acid having from about 4 to about 8 carbon atoms wherein the basestock has a viscosity at 100° C. in the range of about 20 to about 50 cSt at 100° C. and a pour point of less than about −20° C.;
- and
- (B) an effective amount of a polyoxyalkylene alcohol demulsifying agent, an ashless dithiocarbamate antiwear and extreme pressure agent, and a combination of alkylated organic acids and esters thereof and ashless succinimide rust inhibitors.
1 more element
A lubricant composition comprising:
- (A) greater than 90 Wt % based on the total weight of the composition of a synthetic ester basestock having a viscosity at 100° C. in the range of about 2 to 50 cSt and a pour point of less than −30° C.;
- and formed from
- (i) the reaction product of (1) mono- and dipentaerythritol and (2) mixed acids comprising 30 to 40 mole % of C7 to C10 linear acid, from 24 to 28% of a dicarboxylic acid having 5 to 7 carbon atoms and from 34 to 40 mole % of a branched acid having 17 to 19 carbon atoms;
- (ii) the reaction product of (1) mono- and dipentaerythritol and (2) mixed acids comprising 2 to 6 mole % of C7 to C10 linear acids, from 25 to 29 mole % of a dicarboxylic acid and from 65 to 70 mole % of a branched acid having 17 to 19 carbon atoms;
- and
- (B) based on the total weight of the composition from 0.03 to 0.30 wt % of a polyoxyalkylene alcohol demulsifier solution having from 85 to 95 wt % TCP, and from 0.3 to 2.5 wt % of an ashless dithiocarbamate antiwear and extreme pressure agent, from 0.03 to 0.35 wt % of a combination of alkylated organic acid and esters thereof and ashless succinimide rust inhibitors.
3 more elements
Dependencies are inferred from the claim text.