Method for removing substrates provided with organic coatings

Patent metadata

Field	Value
Publication number	US-10040955-B2
Application number	US-201515115872-A
Country	US
Kind code	B2
Filing date	Feb 3, 2015
Priority date	Feb 4, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The invention relates to a method for removing a substrate that is coated with an organic coated coating by means of ionogenic gel formation. In said method, a wet or dry organic coating that has not yet formed a film on the substrate is treated with an aqueous solution of a metal salt from main group I in the periodic table of the elements, a complexing agent and/or a basic compound having a pH value >10.

First claim

The invention claimed is:

1. A method for removing an ionogenic gel coating from a substrate, said method comprising:
providing said substrate having an ionogenic gel coating applied thereon, wherein said ionogenic gel coating is wet or dry and has not yet formed a film on said substrate;
removing said ionogenic gel coating by treating said substrate with an aqueous solution comprising:
at least one selected from the group consisting of a metal salt from main group I in the periodic table of the elements, a complexing agent, and a basic compound having a pH value >10.

2. The method according to claim 1 , wherein treating the substrate is carried out by either dipping or spraying.

3. The method according to claim 1 , wherein the metal salt is selected from the group consisting of Li, Na, K, and a combination of Na and K.

4. The method according to claim 1 , wherein the complexing agent is selected from the group consisting of EDTA, polyethylenimine, and combinations thereof.

5. The method according to claim 1 , wherein the basic compound is selected from the group consisting of aqueous solutions of NaOH, KOH and/or NH 3 .

6. The method according to claim 1 , wherein a concentration of the metal salt in the aqueous solution is between 10% and 70% w/w.

7. The method according to claim 1 , wherein the ionogenic gel coating removed is a wet coating.

8. The method according to claim 1 , wherein the thickness of the ionogenic gel coating is in a range of 1 μm to 100 μm.

9. The method according to claim 1 , further comprising:
recoating said substrate after removing the ionogenic gel coating.

10. The method according to claim 1 , wherein a concentration of the metal salt in the aqueous solution is at least 5% w/w.

11. The method according to any of claims 2 to 5 , wherein a concentration of the metal salt in the aqueous solution is at least 5% w/w.

12. The method according to claim 6 , wherein the concentration is between 20% and 45% w/w.

13. The method according to claim 9 , further comprising:
pretreating said substrate prior to recoating.

14. The method according to claim 10 , wherein the ionogenic gel coating removed is a wet coating.

15. The method according to claim 10 , wherein the thickness of the ionogenic gel coating is in a range of 1 μm to 100 μm.

16. The method according to claim 10 , further comprising:
recoating said substrate after removing the ionogenic gel coating.

17. The method according to claim 16 , further comprising:
pretreating said substrate prior to recoating.

Assignees

• Chemetall Gmbh

Inventors

• Eilinghoff Ron
• Schwamb Michael
• Wasserfallen Daniel
• Sotke Vera
• Frenkel Aliaksandr
• Gerold Stephanie
• Bremser Wolfgang
• Droll Martin
• Seewald Oliver
• Niesen-Warkentin Evgenija
• Schachtsiek Lars
• Traut Manuel

Classifications

• C23G1/24

  with neutral solutions · CPC title

• C23G1/14 Primary

  with alkaline solutions · CPC title

• C23G1/18

  Organic inhibitors · CPC title

• B05D1/18

  performed by dipping · CPC title

• C23G1/26

  using inhibitors · CPC title