Dispersant and VI improver additive and lubrication oil composition containing same
AssigneeTexaco Inc.
InventorsTheodore E. Nalesnik, Benjamin J. Kaufman, James G. Dadura
Life of this patent
Estimating the term…
Abstract
An additive composition comprising a graft and derivatized block copolymer prepared from a styrene-ethylenebutylene-styrene characterized in that unsaturation in the styrene blocks is equal to or greater than 50 percent, and the ethylenebutylene block is hydrogenated leaving no more than 10 percent unsaturation which has been grafted with at least one olefinic carboxylic acid acylating agent and then derivatized with an aminoaromatic compound from the group consisting of aminopyridines, aminopyrazines and aminopyrimidines, and a lubricating oil composition containing same are provided.
Claims8
An additive composition prepared by the steps comprising:
- A) reacting a styrene-ethylenebutylene-styrene block copolymer, having styrene-ethylenebutylene-styrene molecular weight ratios, respectively, of 1:10:1 to 1:3:1 characterized in that unsaturation in the styrene blocks is equal to or greater than 50 percent and the ethylene butylene block is hydrogenated leaving no more than 10 percent unsaturation, with at least one olefinic carboxylic acid acylating agent to form one or more acylating reaction intermediates characterized by having a carboxylic acid acylating function within their structure, and
- B) reacting said reaction intermediate in (A) with an aminoaromatic compound selected from the group consisting of aminopyridines, aminopyrazines and aminopyrimidines represented by the following formulas:
- ##STR3## in which R is hydrogen or an alkyl or alkoxyl radical having from 1 to 5 carbon atoms.
A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount effective to impart viscosity index and dispersancy properties to said oil of an additive composition prepared by the steps comprising:
- A) reacting a styrene-ethylenebutylene-styrene block copolymer, having styrene-ethylenebutylene-styrene molecular weight ratios, respectively, of 1:10:1 to 1:3:1 characterized in that unsaturation in the styrene blocks is equal to or greater than 50 percent and the ethylene butylene block is hydrogenated leaving no more than 10 percent unsaturation, with at least one olefinic carboxylic acid acylating agent to form one or more acylating reaction intermediates characterized by having a carboxylic acid acylating function within their structure, and
- B) reacting said reaction intermediate in (A) with an aminoaromatic compound selected from the group consisting of aminopyridines, aminopyrazines and aminopyrimidines represented by the following formulas:
- ##STR4## in which R is hydrogen or an alkyl or alkoxyl radical having from 1 to 5 carbon atoms.
Dependencies are inferred from the claim text.