Corrosion inhibitors for fuels and lubricants

Patent metadata

Field	Value
Publication number	US-10844308-B2
Application number	US-201716307796-A
Country	US
Kind code	B2
Filing date	Jun 27, 2017
Priority date	Jul 5, 2016
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

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

First claim

The invention claimed is:

1. A corrosion inhibitor, comprising a reaction product that is essentially free of acid groups and is obtained by reacting:
a polyisobutene (A), having a number-average molecular weight Mn of 200 to 10,000, with
a maleic acid derivative (B) comprising an anhydride,
in a stoichiometric ratio of more than one equivalent of (B) per a total of terminal α- and β-double bonds, determined by 13 C NMR, in (A),
where a bismaleation level, calculated as 100%×[(wt-% (BM PIBSA)/(wt-% (BM PIBSA)+wt-% (PIBSA))], wherein PIBSA represents monomaleated polyisobutene and BM PIBSA represents polymaleated polyisobutene, is 15% to 40%,
with the proviso that more than 90% of the anhydride groups present in (B) are conserved in the reaction product.

2. The corrosion inhibitor of claim 1 , wherein (A) has a number-average molecular weight M n of 500 to 2,500.

3. The corrosion inhibitor of claim 1 , wherein (B) comprises maleic anhydride.

4. The corrosion inhibitor of claim 1 , wherein the reaction product comprises no more than 30% by weight of unreacted (A).

5. A method of reducing corrosion on a nonferrous metal surface, the method comprising contacting the nonferrous metal surface with the corrosion inhibitor of claim 1 or a composition comprising the corrosion inhibitor.

6. A gasoline fuel, comprising the corrosion inhibitor of claim 1 .

7. The gasoline fuel of claim 6 , having a sodium and/or potassium content of at least 0.1 ppm by weight.

8. The gasoline fuel of claim 6 , having a magnesium and/or calcium content of at least 0.1 ppm by weight.

9. The gasoline fuel of claim 6 , having a zinc content of at least 0.1 ppm by weight.

10. A lubricant, comprising the corrosion inhibitor of claim 1 .

11. A method of producing a gasoline fuel or a lubricant, the method comprising adding the corrosion inhibitor of claim 1 to the gasoline fuel or to the lubricant.

12. The corrosion inhibitor of claim 1 , where a proportion of unconverted polyisobutene in the reaction product is not more than 10% by weight.

13. The corrosion inhibitor of claim 1 , where at least 92% of the anhydride groups present in (B) are conserved in the reaction product.

14. The corrosion inhibitor of claim 1 , where at least 94% of the anhydride groups present in (B) are conserved in the reaction product.

15. The corrosion inhibitor of claim 1 , where at least 95% of the anhydride groups present in (B) are conserved in the reaction product.

16. The corrosion inhibitor of claim 1 , where at least 96% of the anhydride groups present in (B) are conserved in the reaction product.

Assignees

• Basf Se

Inventors

• Mezger Jochen
• Csihony Szilard

Classifications

• C10L1/198 Primary

  obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds {homo- or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon to carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid} · CPC title

• C10M133/54

  Amines · CPC title

• C10M2207/129

  having hydrocarbon chains of thirty or more carbon atoms · CPC title

• C10M129/95

  Esters · CPC title

• C10M129/93

  having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms · CPC title