Patent ID: 9644167
Date: 2017-05-09
CPC Classifications: C10M,C10N

Claim:
1. A lubricating composition comprising an oil of lubricating viscosity, a polyisobutylene succinimide dispersant, a dispersant viscosity modifier and an amine-functionalised additive, wherein the polyisobutylene succinimide dispersant is derived from a polyisobutylene having a molecular weight or 750 to 2500, wherein the amine-functionalised additive is derived from an amine having at least 3 aromatic groups, the amine having at least 3 aromatic groups selected from the group consisting of a) amines represented by the formula:  wherein independently each variable b) bis[p-(p-aminoanilino)phenyl]-methane, 2-(7-amino-acridin-3-ylmethyl)-N-4-{4-[4-(4-amino-phenylamino)-benzyl]-phenyl}-benzene-1,4-diamine, or mixtures thereof, and c) amines obtained/obtainable by a process comprising reacting: (1) isatoic anhydride or alkyl substituted isatoic anhydride and (2) an aromatic amine with at least two aromatic groups and a primary or a reactive secondary amino group, wherein the amine-functionalised additive is a product obtained by reacting the amine having at least 3 aromatic groups with a carboxylic functionalised polymer, and wherein the dispersant viscosity modifier is either: prepared by grafting of an olefinic carboxylic acid acylating agent onto a polymer of 15 to 80 mole percent of ethylene, from 20 to 85 mole percent of C or a reaction product of: (a) a polymer comprising carboxylic acid functionality or a reactive equivalent thereof, said polymer having a number average molecular weight of greater than 5,000; and (b) an amine component comprising at least one aromatic amine containing at least one amino group capable of condensing with said carboxylic acid functionality to provide a pendant group and at least one additional group comprising at least one nitrogen, oxygen, or sulfur atom, wherein said aromatic amine is selected from the group consisting of (i) a nitro-substituted aniline, (ii) an amine comprising two aromatic moieties linked by a —C(O)NR— group, a —C(O)O— group, an —O— group, an —N═N— group, or an —SO