Method for preparing and processing catalyst solutions

US11219888B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Michael Traving · Burscheid, DE
• Holger Rosellen · Leverkusen, DE
• Salvatore Manzelli · Troisdorf, DE
• Cosimo Calandrelli · Krefeld, DE
• Stephan Reimer · Zülpich, DE
• Frank Richter · Frankfurt, DE
• Joerg Kolle · Kerpen, DE

Key dates

• Filing date: Jul 24, 2020
• Grant date: Jan 11, 2022
• Expiry date: Jul 24, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/24
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Provided is a method for preparing a solution B comprising at least one catalyst in at least one second solvent, comprising at least the following steps of (A) providing a solution A comprising the at least one catalyst in at least one first solvent, (B) treating the solution A from step (A) with activated carbon, (C) removing the activated carbon from the solution A, and (D) exchanging the at least one first solvent in solution A for at least one second solvent in order to obtain the solution B comprising the at least one catalyst in at least one second solvent, to a solution of at least one catalyst in at least one second solvent, obtainable by the method according to the invention, to the use of this solution for preparing a composition comprising the at least one catalyst, the at least one second solvent, at least one polyisocyanate and at least one NCO-reactive compound, to the use of this composition for producing a single-layered or multi-layered coating system and a corresponding process.