Process for producing polyisocyanurate plastics

US10717805B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Mathias Matner · Neuss, DE
• Dirk Achten · Leverkusen, DE
• Hans-Josef Laas · Odenthal, DE
• Heiko Hocke · Shanghai, CN
• Dieter Mager · Leverkusen, DE

Key dates

• Filing date: Apr 21, 2016
• Grant date: Jul 21, 2020
• Expiry date: Apr 21, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing polyisocyanurate plastics, comprising the following steps: (a) providing a polyisocyanate composition A) which contains oligomeric polyisocyanates and is low in monomeric diisocyanates, where the isocyanurate structure content in the polyisocyanate composition A) is at least 50 mol %, based on the sum total of the oligomeric structures from the group consisting of uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and oxadiazinetrione structure that are present in the polyisocyanate composition A); (b) catalytically trimerizing the polyisocyanate composition A), where (i) the catalytic trimerization is conducted at ambient temperatures of at least 80° C.; (ii) the catalytic trimerization is conducted within less than 12 hours at least up to a degree of conversion at which only still not more than 20% of the isocyanate groups originally present in the polyisocyanate composition A) are present. Furthermore, the invention relates to a polyisocyanurate plastic obtainable by the process of the invention, to its use for producing coatings, films, semi-finished products and moldings.