Process for producing polyurethane-polyisocyanurate elastomers, sealing materials and adhesives having a long pot life

US12162973B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Julia Liese · Bremen, DE
• Andre Kamm · Bohmte, DE
• Hendrik Wagner · Bielefeld, DE

Key dates

• Filing date: Mar 25, 2020
• Grant date: Dec 10, 2024
• Expiry date: Sep 14, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2200/065
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Described herein is a process for preparing a polyurethane elastomer including the steps of (A) preparing an isocyanate prepolymer (a), where the isocyanate prepolymer has an isocyanate content in the range of ≥1 wt.-% to ≤9 wt.-%, and (B) preparing a reaction mixture by mixing at least one epoxy compound (b) with the isocyanate prepolymer (a) in presence of at least one catalyst (c), and where the amount of the alkali metal or alkaline earth metal salt is 0.00001 to 0.1 mol per kg of the total weight of the isocyanate prepolymer (a), the epoxy compound (b) and the catalyst (c), and heating the mixture to at least 80° C. to obtain the polyurethane elastomer. Also described herein are a polyurethane elastomer obtained by the process and a method of using the polyurethane elastomer as part of a roller or as a sealant.