Polymeric compositions comprising an oil-soluble polymer and an oil-soluble acrylate polymerization of product

A polymeric composition comprising a mixture, comprising:

• (A) an oil-soluble polymer selected from the group consisting of a homopolymer of a non-aromatic mono-olefin having at least three carbon atoms, and a copolymer of the non-aromatic mono-olefin with an aromatic monoolefin, said polymer having a number average molecular weight of about 500 to about 100,000;
• and
• (B) which is a mixture containing both (B-1) and (B-2), wherein (B-1) is a nitrogen-containing ester of a carboxy-containing interpolymer derived from at least two monomers, one of said monomers being an aliphatic olefin or a vinyl aromatic monomer, the other of said monomers being (ii) at least one alpha, beta-unsaturated aliphatic carboxylic acid, anhydride or ester thereof, the interpolymer having a reduced specific viscosity of from about 0.05 to about 2, the nitrogen-containing ester being characterized by the presence within its polymer structure of the following polar groups which are derived from the carboxy group of the interpolymer:
• (a) at least one carboxylic ester group having at least 8 aliphatic carbon atoms in the ester group, and
• (b) at least one carbonyl-polyamino group derived from reacting a carboxy group of said interpolymer with a polyamino compound having one primary or secondary amino group and at least one tertiary amino or heterocyclic amino group;
• and
• (B-2) is an oil-soluble acrylate polymerization product of at least one ester of the formula
• CH.sub.2 .dbd.C(X)--COOR (III)
• wherein X is hydrogen or an alkyl or aryl group, and R is a monovalent hydrocarbyl group containing at least four carbon atoms, or an ether derivative of said hydrocarbyl group.