Cycloaminals and a process for their preparation

Abstract

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 5 (NCO) 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 m represents an integer of from 1 to 3, and n represents 0, 1 or 2, and the sum of m+n is 2 or 3, R 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; R 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; R 3 and R 4 are identical or different and represent hydrogen, aliphatic hydrocarbon groups having from 1 to 18 carbon atoms, cycloaliphatic hydrocarbon groups having from 5 to 10 carbon atoms or aromatic hydrocarbon groups having from 6 to 10 carbon atoms, or the two groups R 3 and R 4 together with the carbon atom of the heterocyclic ring may also form a 5-membered or 6-membered cycloaliphatic ring; and R 5 represents an (m+n)-valent group such as that which can be obtained by the removal of m+n isocyanate groups from an (m+n)-valent polyisocyanate.

Inventors

• 👤 Manfred Hajek
• 👤 Kuno Wagner
• 👤 Walter Uerdingen
• 👤 Wolfgang Wellner

Bibliographic Details