Use of N-(aminoalkyl) pyrrolidines as catalysts for the polyisocyanate polyaddition process

USRE38415E1 · kind E1 · reissue

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Richard Weider · Leverkusen, DE
• Uwe Scholz · Hanerau-Hademarschen, DE

Key dates

• Filing date: Oct 7, 2002
• Grant date: Feb 3, 2004
• Expiry date: Oct 7, 2022

Classification

• Technology area (CPC —): General

Abstract

The present invention relates to a process for preparing polyisocyanate polyaddition products by reacting(a) polyisocyanates with(b) relatively high molecular weight compounds containing at least two isocyanate-reactive hydrogen atoms and(c) chain-extending agents, in the presence of(d) N-(aminoalkyl)pyrrolidine catalysts corresponding to formula (I) in whichR is a C2-12 alkylene group (optionally containing O or N atoms but not isocyanate-reactive groups) andR′ is hydrogen or a C1-4 alkyl group,(e) optionally, other known catalysts, and(f) other known additives.