Appeal No. 95-5126
Application No. 08/045,675
14. A gear lubricant composition which comprises a major
amount of oil of lubricating viscosity containing at least the
following components:
b) from 1 to 10% by weight based on the weight of said
lubricant composition of at least one organic
sulfur- containing antiwear and/or extreme pressure
agent having a sulfur content of at least about 20% by
weight based on the weight of said antiwear and/or extreme
pressure agent;
c) from 0.2 to 5% by weight based on the weight of said
lubricant composition of at least one ashless
dispersant;
d) from 0.02 to 1% by weight based on the weight of said
lubricant composition of at least one dimethyl ester
of an aliphatic phosphonic acid in which the aliphatic
group has an average in the range of about 12 to about 24
carbon atoms; and
e) from 0.06 to 4% by weight based on the weight of said
lubricant composition of at least one 3-hydrocarbyl-
2,5- diketopyrrolidine in which the hydrocarbyl group is
an alkyl or alkenyl group having an average in the range
of about 12 to about 30 carbon atoms.
22. The method of improving the low temperature
solubility and compatibility of a dimethyl ester of an
aliphatic phosphonic acid in which the aliphatic group has an
average in the range of about 12 to about 24 carbon atoms in
an additive concentrate that contains at least one organic
sulfur antiwear and/or extreme pressure agent and a minor
amount of diluent oil, which method comprises blending
therewith at least one 3-hydrocarbyl-2,5-diketopyrrolidine in
which the hydrocarbyl group is an alkyl or alkenyl group
having an average in the range of about 12 to about 30 carbon
atoms in an amount such that the weight ratio of said
diketopyrrolidine to said dimethyl ester is at least 3:1.
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