Mixtures of esterified carboxy-containing interpolymers and lubricants containing them
AssigneeThe Lubrizol Corporation
InventorMichael J. Covitch
Life of this patent
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Abstract
Mixtures of esterified carboxy-containing interpolymers and additive concentrates and lubricating oil compositions containing same. Residual acidity of the esterified interpolymers may be neutralized by reaction with an amine.
Claims26
A composition comprising a mixture of esterified carboxy-containing interpolymers, said interpolymers having a reduced specific viscosity (RSV) of from about 0.05 to about 2 and being derived from at least two monomers comprising (i) an aliphatic olefin containing from 2 to about 30 carbon atoms or a vinyl aromatic monomer and (ii) an alpha, beta-unsaturated acylating agent, said mixture being characterized by the presence therein of at least two members of the group consisting of
- (I) an ester which within its polymeric structure consists essentially of
- (A) pendant carboxylic ester groups which are derived from the carboxy groups of said interpolymers, said carboxylic ester groups containing at least 8 carbon atoms;
- (II) an ester which is a mixed ester of said carboxy-containing interpolymers and being characterized by the presence within its polymeric structure of at least one of each of two ester groups:
- (B) relatively high molecular weight pendant carboxylic ester groups containing at least eight aliphatic carbon atoms, and
- (C) relatively low molecular weight pendant carboxylic ester groups containing no more than seven aliphatic carbon atoms, wherein the molar ratio of (B):(C):
- is (70-95):(5-30);
- (III) an ester which is a nitrogen-containing ester, and which within its polymeric structure consists essentially of
- (A) pendant carboxylic ester groups which are derived from the carboxy groups of said interpolymers, said carboxylic ester groups containing at least 8 carbon atoms, and
- (D) pendant carbonyl-amino groups derived from amino compounds having an average of from 1 to about 1.1 primary or secondary 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 (D) is in the range of from about 85:15 to about 99:1;
- and
- (IV) an ester which is a nitrogen-containing ester, which is a mixed ester of said carboxy-containing interpolymers and being characterized by the presence within its polymeric structure of at least one of each of three groups:
- (B) relatively high molecular weight pendant carboxylic ester groups containing at least eight aliphatic carbon atoms,
- (C) relatively low molecular weight pendant carboxylic ester groups containing no more than seven aliphatic carbon atoms, and
- (E) pendant carbonyl-amino groups derived from amino compounds having an average of from 1 to about 1.1 primary or secondary amino group,
- wherein the molar ratio of(B):(C):(E) is (60-94):(5-30):(1-15);
- and wherein the at least two members include at least one ester having the carboxylic ester group (A) and at least one ester having the carboxylic ester groups (B) and (C).
A composition useful as a pour point depressant for hydrocarbon based liquids, prepared by a process comprising mixing together two or more esterified carboxy-containing interpolymers having a reduced specific viscosity of from about 0.05 to about 2, said interpolymers being derived from at least two monomers comprising (i) an aliphatic olefin containing from 2 to about 30 carbon atoms or a vinyl aromatic monomer and (ii) an alpha, beta-unsaturated acylating agent, said mixture being characterized by the presence therein of at least two members of the group consisting of
- (I) an ester which within its polymeric structure consists essentially of
- (A) pendant carboxylic ester groups which are derived from the carboxy groups of said interpolymers, said carboxylic ester groups containing at least 8 carbon atoms;
- (II) an ester which is a mixed ester of said carboxy-containing interpolymers and being characterized by the presence within its polymeric structure of at least one of each of two ester groups:
- (B) relatively high molecular weight pendant carboxylic ester groups containing at least eight aliphatic carbon atoms, and
- (C) relatively low molecular weight pendant carboxylic ester groups containing no more than seven aliphatic carbon atoms, wherein the molar ratio of (B):(C) is (70-95):(5-30);
- (III) an ester which is a nitrogen-containing ester, and which within its polymeric structure consists essentially of
- (A) pendant carboxylic ester groups which are derived from the carboxy groups of said interpolymers, said carboxylic ester groups containing at least 8 carbon atoms, and
- (D) pendant carbonyl-amino groups derived from amino compounds having an average of from 1 to about 1.1 primary or secondary 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 (D) is in the range of from about 85:15 to about 99:1;
- and
- (IV) an ester which is a nitrogen-containing ester, which is mixed ester of said carboxy-containing interpolymers and being characterized by the presence within its polymeric structure of at least one of each of three groups:
- (B) relatively high molecular weight pendant carboxylic ester groups containing at least eight aliphatic carbon atoms,
- (C) relatively low molecular weight pendant carboxylic ester groups containing no more than seven aliphatic carbon atoms, and
- (E) pendant carbonyl-amino groups derived from amino compounds having an average of from 1 to about 1.1 primary or secondary amino group, wherein the molar ratio of(B):(C):(E) is (60-94):(5-30):(1-15),
- and wherein the at least two members include at least one ester having the carboxylic ester group (A) and at least one ester having the carboxylic ester groups (B) and (C).
Dependencies are inferred from the claim text.