Cycloaminals and a process for their preparation

US4404379A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Hajek · Leverkusen, DE
• Kuno Wagner · Leverkusen, DE
• Walter Uerdingen · Leverkusen, DE
• Wolfgang Wellner · Bensberg, DE

Key dates

• Filing date: Aug 21, 1978
• Grant date: Sep 13, 1983
• Expiry date: Aug 21, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/808
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention is concerned with a new class of compounds prepared by reacting cyclic aminals of the formula ##STR1## with polyisocyanates of the formula R.sub.5 (NCO).sub.m+n to yield ##STR2## and with this process for obtaining said compounds, as well as the use of such compounds in polyurethane chemistry. If such compounds are free of isocyanates (n=0) they are useful as latent cross-linkers or hardeners activatable by heat or moisture. If such compounds carry free isocyanate groups (n=1 or 2) there are useful as synthetic resin precursors. In the above formulae PA0 m represents an integer of from 1 to 3, and PA0 n represents 0, 1 or 2, and the sum of m+n is 2 or 3, PA0 R.sub.1 represents an aliphatic hydrocarbon group which is optionally cyano-substituted and which has from 1 to 6 carbon atoms, a cycloaliphatic hydrocarbon group having from 5-10 carbon atoms or an araliphatic hydrocarbon group having from 7-10 carbon atoms; PA0 R.sub.2 represents a divalent aliphatic hydrocarbon group having from 2 to 6 carbon atoms, at least two carbon atoms being situated between the two nitrogen atoms; PA0 R.sub.3 and R.sub.4 are identical or different and represent hydrogen, aliphati…