Patent ID: 6403725
Filing Date: 2002-06-11
Classification: C08F

Abstract:
A metal containing polymer composition comprising;a metal overbased imide or ester functionalized polymer prepared by reacting (A) a polymer comprising (A1) an acidic functionalized polymer or ester functionalized polymer comprising a polyolefin having attached or grafted acidic functionality or ester functionality, said polyolefin having a number average molecular weight of at least 500; (A2) an acidic mixed ester-acid of a carboxy containing interpolymer, said interpolymer having a reduced specific viscosity of from about 0.05 to about 2 and being derived from at least two monomers, one of said monomers being a low molecular aliphatic olefin, styrene or substituted styrene wherein the substituent is a hydrocarbyl group containing from 1 up to 18 carbon atoms, and the other of said monomers being an alpha, beta-unsaturated aliphatic acid, anhydride or ester thereof, said ester being characterized by the presence within its polymeric structure of a pendant polar group which is derived from the carboxy groups of said ester: (a) a relatively high molecular weight carboxylic ester group, said carboxylic ester group having at least 8 aliphatic carbon atoms in the ester radical and (b) a relatively low molecular weight carboxylic ester group, said carboxylic ester group having no more than 7 aliphatic carbon atoms in the ester radical; wherein the molar ratio of (a):(b) is (1-20): 1; or (A3) an ester functionalized polymer comprising a lactone comprising the reaction product of one or more hydroxyaromatic compounds, most of the units of which are hydrocarbyl-substituted; provided that if the hydroxyaromatic compound comprises bridged ring units, then substantially all such units are hydroxyl- and hydrocarbyl-substituted; a carboxy-substituted carbonyl compound or a source thereof; and a carbonyl compound other than a carboxy-substituted carbonyl compound, or a source thereof; and (B) a metal overbased composition that contains reactive basic functionality comprising (B1) a metal overbased amine wherein the reactive basic functionality is a primary or secondary amino group, (B2) a metal overbased hydroxy substituted carboxylic acid wherein the reactive basic functionality is a hydroxy group, or (B3) a metal overbased dispersant wherein the reactive basic functionality is a primary or secondary amino group.