Prepolymers containing isocyanate groups
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United States of America Patent
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Sep 17, 1996
Issued Date -
N/A
app pub date -
Nov 1, 1995
filing date -
May 21, 1994
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Abstract
The invention relates to prepolymers containing isocyanate groups which can be prepared by reacting a) organic isocyanates with b) polyetherols containing at least 2 hydroxyl groups per molecule and having molecular weights of greater than 400 and/or polyesterols containing at least 2 hydroxyl groups per molecule and having molecular weights of greater than 400, c) isocyanate-reactive compounds which are at least difunctional and have molecular weights of from 18 to 399, and, if desired, d) Lewis and/or Bronsted acidic compounds and e) conventional auxiliaries and additives, such as antioxidants, light stabilizers or fillers, wherein at least one aromatic aminopolyether alcohol of the formula ##STR1## where R is aryl, alkylaryl containing one or more C.sub.1 - to C.sub.4 -alkyl groups, haloaryl, nitroaryl or cyanoaryl, R' and R' are identical or different and are, independently of one another, hydrogen, alkyl, aryl, aralkyl, alkoxyalkyl, alkoxyaryl or aroxyaryl, x and y are independent of one another and x+y.gtoreq.10, z is from 1 to 4, is employed as a further component, their preparation and their use for the preparation of compact or cellular polyurethanes.
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