Sulfone copolymeric additive for hydrocarbon oils
AssigneeExxon Research & Engineering Co.
InventorHarold N. Miller
Life of this patent
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Abstract
Sulfone copolymeric oil additives having utility as a lubricating oil pour point depressant, viscosity index improver, dispersant, load carrying agent, rust inhibitor and/or antioxidant, or as a cold flow improver for heavy distillates and residual fuels, comprise the hydrocarbon soluble copolymers of an ethylenically unsaturated polar monomer and sulfur dioxide. This sulfone copolymer may contain one or more additional monomers including: C.sub.2 to C.sub.50, preferably at least C.sub.6, substantially linear alpha olefins; C.sub.2 to C.sub.12, preferably C.sub.2 to C.sub.9, cyclic olefins; and, C.sub.4 to C.sub.6 conjugated diolefins.
Claims8
A composition comprising a major proportion of lubricating oil, and dissolved therein, in the range of about 0.01 to 20 wt. %, based on the total weight of said composition, of oil soluble sulfone copolymer of:
- a. about 30 to about 50 mole percent of sulfur dioxide,
- b. about 20 to about 70 mole percent of an ethylenically unsaturated polar monomer which is copolymerizable with sulfur dioxide and has a total of 8 to 52 carbon atoms and is represented by the general formula:
- ##STR2## wherein R' and R" are independently selected from the group consisting of hydrogen, halogen and C.sub.1 to C.sub.12 alkyl radicals;
- Q' is selected from the group consisting of --COOH, --CN, --CH.sub.2 OH, --COOR'", --CH.sub.2 --O--R", --CH.sub.2 --CO--R'" and --O--R'";
- and Q" is selected from the group consisting of hydrogen, --COOH, --CN, and --COOR'";
- and wherein R'" is selected from the group consisting of C.sub.1 to C.sub.24 straight and branched chain alkyl, arylalkyl, and cycloalkyl radicals;
- c. 0 to about 68 mole % of C.sub.2 to C.sub.50 monoolefin;
- and
- d. 0 to about 6 mole % diolefin;
- wherein said copolymer has a number average molecular weight (Mn) in the range of about 400 to about 750,000 and improves one or more properties of said lubricating oil.
Dependencies are inferred from the claim text.