Corrosion inhibitors for fuels and lubricants

Patent metadata

Field	Value
Publication number	US-10377958-B2
Application number	US-201515115594-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Jan 29, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

First claim

The invention claimed is:

1. A method for inhibiting corrosion of a metal surface, the method comprising:
applying a corrosion inhibitor to at least one of an iron surface, a steel surface and a nonferrous metal surface, wherein the corrosion inhibitor comprises a copolymer obtained by a process comprising:
copolymerizing by addition polymerization:
(A) at least one ethylenically unsaturated mono- or dicarboxylic acid or a derivative thereof selected from the group consisting of an anhydride in a monomeric or a polymeric form, a mono- or dialkyl ester, and a mixed ester,
(B) at least one α-olefin comprising from 16 to 28 carbon atoms,
(C) optionally at least one aliphatic or cycloaliphatic olefin which comprises at least 4 carbon atoms and is different than (B), and
(D) optionally at least one copolymerizable monomer other than (A), (B) and (C), which is selected from the group consisting of (Da) a vinyl ester, (Db) a vinyl ether, (Dc) a (meth)acrylic ester of an alcohol comprising at least 5 carbon atoms, (Dd) an allyl alcohol or ether thereof, (De) a N-vinyl compound selected from the group consisting of a vinyl compound of a heterocycle comprising at least one nitrogen atom, a N-vinylamide, and a N-vinyllactam, (Df) an ethylenically unsaturated aromatic, (Dg) an α,β-ethylenically unsaturated nitrile, (Dh) a (meth)acrylamide, and (Di) an allylamine,

thereby obtaining a first copolymer; and
subsequently partly or fully hydrolyzing anhydride or carboxylic ester functionalities present in the first copolymer into acid groups so that a content of the acid groups in the copolymer is from 1 to 8 mmol acid groups per gram of the copolymer, thereby obtaining the copolymer,
wherein the copolymer has a weight-average molecular weight Mw determined by gel permeation chromatography with tetrahydrofuran and polystyrene as standard of 1.5 to 4 kDa.

2. The method of claim 1 , wherein (A) is at least one selected from the group consisting of acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, and maleic anhydride.

3. The method of claim 1 , wherein (A) is a dicarboxylic acid or a derivative thereof and is at least one selected from the group consisting of an anhydride in a monomeric or a polymeric form, a mono- or dialkyl ester, and a mixed ester.

4. The method of claim 1 , wherein (B) is an α-olefin comprising from 18 to 26 carbon atoms.

5. The method of claim 1 , wherein (C) is present during said copolymerizing and is a polymer comprising more than 30 carbon atoms of propene, 1-butene, 2-butene or isobutene, or an olefin mixture comprising the latter and having a weight-average molecular weight M w in the range of from 500 to 5000 g/mol.

6. The method of claim 1 , wherein
(C) is present during said copolymerizing,
(C) is a polymer of isobutene or an olefin mixture comprising the latter,
(C) has more than 30 carbon atoms, and
(C) has a weight-average molecular weight M w of from 500 to 5000 g/mol.

7. The method of claim 1 , wherein
(C) is present during said copolymerizing, and
an averaged molar amount of a mixture of (B) and (C) comprises at least 12 carbon atoms.

8. The method of claim 1 , wherein
(D) is present during said copolymerizing, and
(D) is at least one selected from the group consisting of (Da), (Db), (Dc), (De) and (Df).

9. The method of claim 1 , wherein
(C) is present during said copolymerizing, and
a molar ratio of (A)/[(B)+(C)] is from 10:1 to 1:10.

10. The method of to claim 9 , wherein a molar ratio of (B) to (C) is from 1:0.05 to 10.

11. The method of claim 1 , wherein
(D) is present during said copolymerizing, and
a proportion of (D), based on a total amount of (A) (B), and optionally (C), is from 5 to 200 mol %.

12. The method of claim 1 , wherein the corrosion inhibitor is contained in a fuel, comprising:
at least one alkali metal, at least one alkaline earth metal, zinc, or a mixture comprising at least two thereof, in a total content of at least 0.1 ppm by weight; and
the corrosion inhibitor.

13. The method of claim 12 , wherein the fuel comprises at least one selected from the group consisting of sodium, magnesium, and calcium.

14. The method of claim 12 , wherein the fuel is a diesel fuel or a gasoline fuel.

15. The method of claim 1 , comprising applying the corrosion inhibitor to a nonferrous metal surface comprising a copper or a copper-containing alloy.

Assignees

• Basf Se

Inventors

• Mezger Jochen
• Peretolchin Maxim
• Flores-Figueroa Aaron
• Hansch Markus
• Garcia Castro Ivette
• Muehlbach Klaus

Classifications

• C10N2060/00

  Chemical after-treatment of the constituents of the lubricating composition · CPC title

• C10N2040/255

  Gasoline engines · CPC title

• C10N2040/253

  Small diesel engines · CPC title

• C10N2030/04

  Detergent property or dispersant property · CPC title

• C10N2030/54

  Fuel economy · CPC title