C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
253/102, 260/297
C08F 226/02 (2006.01) C08F 8/32 (2006.01)
Patent
CA 1209141
ABSTRACT OF THE DISCLOSURE A nitrogen-containing ester of a carboxy-containing interpoly- mer which is particularly useful as a pour point depressnat is disclosed. The interpolymer has a reduced specific viscosity of from about 0.05 to about 1 and is derived from at least two monomers, one of said monomers being a low molecular weight aliphatic olefin or styrene and the other of said monomers being an alpha, beta-unsaturated aliphatic acid, anhydride or ester thereof. The nitrogen-containing ester is substantially free of titratable acidity and is characterized by the presence within its polymeric structure of at least one of each of the following groups which are derived from the carboxy groups of said interpolymer: (A) a carboxylic ester group, said carboxylic ester group having at least eight aliphatic carbon atoms in the ester radical, and (B) a carbonyl-polyamino group derived from a polyamino compound having one primary or secondary amino group and at least one monofunctional amino group, wherein the molar ratio of carboxy groups of said interpolymer esterified to provide (A) to carboxy groups of said interpolymer neutralized to provide (B) is in the range of about 85:15 to about 99:1. Lubricant compositions and additive concentrates comprising the foregoing nitrogen-containing ester as well as a process for making such ester are also disclosed.
431483
Bryant Charles P.
Gerdes Harold M.
Ridout & Maybee Llp
The Lubrizol Corporation
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