Ethylene alpha-olefin copolymer substituted hydroxy aromatic compounds
AssigneeExxon Chemical Patents Inc.
InventorsWon R. Song, Robert D. Lundberg, Antonio Gutierrez, Robert A. Kleist
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Abstract
The present invention is directed to oil-soluble lubricating oil additives comprising Mannich Base condensates of an alkyl substituted hydroxy aromatic compound with formaldehyde and an amine, wherein the alkyl-moiety of the aromatic compounds is derived from at least one ethylene alpha-olefin copolymer of 300 to 20,000 number average molecular weight, wherein at least about 30% of the polymer's chains contain terminal ethenylidene unsaturation. The Mannich Base condensates of this invention are useful as dispersants.
Claims19
An alkylated hydroxy aromatic compound product having improved viscosity properties, formed by the alkylation of (i) at least one hydroxy aromatic compound having the formula H-Ar-(OH).sub.c, wherein Ar is ##STR27## a is 1 or 2;
- R" is a halogen radical;
- b is an integer from 0 to 2;
- and c is an integer from 1 to 2;
- with (ii) at least one ethylene alpha-olefin polymer of 300 to 20,000 number average molecular weight, wherein at least 30% of said polymer's chains contain terminal ethenylidene unsaturation.
A process for forming an ethylene alpha-olefin polymer-substituted hydroxyaromatic compound product in high conversion which comprises contacting in an alkylation zone at a temperature of from about 20.degree. to 250.degree. C. in the presence of an effective amount of at least one acidic alkylation catalyst (i) at least one hydroxy aromatic compound having the formula H-Ar-(OH).sub.c, wherein Ar is ##STR28## a is 1 or 2;
- R" is a halogen radical;
- b is an integer from 0 to 2;
- and c is an integer from 1 to 2, and (ii) at least one ethylene alpha-olefin polymer of 300 to 20,000 number average molecular weight, wherein at least 30% of said polymer's chains contain terminal ethenylidene unsaturation, to form an alkylation product mixture containing said product formed at a conversion of at least about 70%, based on the polymer charged to said zone.
Dependencies are inferred from the claim text.