Polymeric dispersants having alternating polyalkylene and succinic groups
AssigneeChevron Research and Technology Company
InventorJames J. Harrison
Life of this patent
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Abstract
Novel copolymers of unsaturated acidic reactants and high molecular weight olefins wherein at least 20 percent of the total high molecular weight olefin comprises the alkylvinylidene isomer are useful as dispersants in lubricating oils and fuels and also may be used to prepare polysuccinimides and other post-treated additives useful in lubricating oils and fuels.
Claims68
A copolymer of an unsaturated acidic reactant and a high molecular weight alkylvinylidene olefin having a sufficient number of carbon atoms such that the resulting copolymer is soluble in lubricating oil and wherein the olefin has at least about 1 branch per 2 carbon atoms along the chain.
A copolymer of the formula:
- ##STR14## wherein n is 1 or greater, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are selected from hydrogen, lower alkyl of 1 to 6 carbon atoms and high molecular weight polyalkyl;
- wherein either R.sub.1 and R.sub.2 are hydrogen and one of R.sub.3 and R.sub.4 is lower alkyl and the other is high molecular weight polyalkyl, or R.sub.3 and R.sub.4 are hydrogen and one of R.sub.1 and R.sub.2 is lower alkyl and the other is high molecular weight polyalkyl, and wherein the high molecular weight polyalkyl has at least about 1 branch per 2 carbon atoms along the chain.
A product prepared by the process which comprises reacting a high molecular weight olefin wherein at least about 20 percent of the total high molecular weight olefin comprises an alkylvinylidene isomer and wherein said high molecular weight olefin has a sufficient number of carbon atoms such that said product is soluble in lubricating oil with an unsaturated acidic reactant in the presence of a free radical initiator, and wherein the high molecular weight olefin has at least about 1 branch per 2 carbon atoms along the chain.
A compound of the formula:
- ##STR16## wherein n is one or greater, AM has from about 0 to about 10 amine nitrogen atoms and from about 2 to about 40 carbon atoms;
- and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are selected from hydrogen, lower alkyl of 1 to 6 carbon atoms and high molecular weight polyalkyl;
- wherein either R.sub.1 and R.sub.2 are hydrogen and one of R.sub.3 and R.sub.4 is lower alkyl and the other is high molecular weight polyalkyl, or R.sub.3 and R.sub.4 are hydrogen and one of R.sub.1 and R.sub.2 is lower alkyl and the other is high molecular weight polyalkyl;
- and R.sub.5 and R.sub.6 are independently hydrogen, lower alkyl of 1 to 6 carbon atoms, phenyl or taken together are alkylene of 3 to 6 carbon atoms to give a ring, and wherein the high molecular weight polyalkyl has at least about 1 branch per 2 carbon atoms along the chain.
A random polysuccinimide comprising units selected from ##STR17## wherein Am is a linking group having from about 0 to 10 amine nitrogen atoms and from about 2 to 40 carbon atoms;
- R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.1 ', R.sub.2 ', R.sub.3 ',R.sub.4 ', R.sub.1 ", R.sub.2 ", R.sub.3 ", and R.sub.4 " are selected from hydrogen, lower alkyl of one to 6 carbon atoms and high molecular weight polyalkyl;
- wherein either R.sub.1 and R.sub.2 are hydrogen and one of R.sub.3 and R.sub.4 is lower alkyl and the other is polyalkyl, or R.sub.3 and R.sub.4 are hydrogen and one of R.sub.1 and R.sub.2 is lower alkyl and the other is polyalkyl;
- either R.sub.1 ' and R.sub.2 ' are hydrogen and one of R.sub.3 and R.sub.4 is lower alkyl and the other is polyalkyl, or R.sub.3 ' and R.sub.4 ' are hydrogen and one of R.sub.1 ' and R.sub.2 ' is lower alkyl and the other is polyalkyl;
- and either R.sub.1 " and R.sub.2 " are hydrogen and one of R.sub.3 " and R.sub.4 ' is lower alkyl and the other is polyalkyl or R.sub.3 " and R.sub.4 " are hydrogen and one of R.sub.1 " and R.sub.2 " is lower alkyl and the other is polyalkyl;
- R.sub.5 and R.sub.6 are independently hydrogen, lower alkyl of 1 to 6 carbon atoms, phenyl or taken together are alkylene of 3 to 6 carbon atoms to give a ring;
- and a, a', b and b' are sites for a covalent bond;
- provided that at least one a or a' site of each unit is covalently bonded to a b or b' site.
Dependencies are inferred from the claim text.