Epoxy hardening agents

US5071951A · kind A · utility

Assignee

• Rutgerswerke Aktiengesellschaft · DE

Inventors

• Grundke Ulrich · Duisburg, DE
• Alfred Mathes · Duisburg, DE
• Achim Hansen · Zug, CH
• Rolf Herzog · Winterthur, CH

Key dates

• Filing date: Jun 11, 1990
• Grant date: Dec 10, 1991
• Expiry date: Jun 11, 2010

Classification

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

Abstract

A hardening agent for epoxy compounds prepared by reacting A) at least one member of the group consisting of polyalkyleneetherdiols and polyalkyleneetherpolyols with B) at least one polyisocyanate with a molar ratio of hydroxy groups to isocyanate group of 1:1.8 to 3, reacting the resulting product with C) an amine having at least one free primary or secondary amino group and at least one protected primary amino group with a molar ratio of isocyanate to amino groups of 1:1 to 2 and subjecting the latter product to hydrolysis useful for preparation of flexible hardened products with excellent mechanical properties.