Process for the preparation of amines, the amines thus obtained and the use thereof as hardeners for epoxide resins

US5219975A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Lutz Schmalstieg · Neunburg vorm Wald, DE
• Karl-Heinz Hentschel · Krefeld, DE
• Josef Pedain · Cologne, DE
• Klaus Nachtkamp · Cologne, DE

Key dates

• Filing date: May 7, 1991
• Grant date: Jun 15, 1993
• Expiry date: May 7, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L63/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for the preparation of amines containing urethane and urea groups. The amines are produced by reacting A) isocyanate prepolymers containing urethane groups and in which the isocyanate groups are reversibly blocked with secondary monoamines with B) amines having molecular weights of from 60 to 500, which are at least difunctional and which have a total of at least two primary or secondary amino groups, with splitting off of the secondary monoamine. The invention is also directed to the amines so produced and to the use as a hardener for an epoxide resin.