Aspartate-terminated urea/urethane prepolymers and their use in coating compositions
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United States of America Patent
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Mar 12, 2002
Grant Date -
Jan 3, 2002
app pub date -
Sep 2, 1999
filing date -
Sep 2, 1999
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Abstract
The present invention relates to aspartate-terminated urea/urethane prepolymers that are based on the reaction products of NCO prepolymers with compounds corresponding to the formula ##STR1## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less, R.sub.1 and R.sub.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less, R.sub.3 and R.sub.4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less and n represents an integer with a value of at least 2, at an equivalent ratio of aspartate groups to isocyanate groups of 1.5:1 to 20:1. The present invention also relates to coating compositions containing the aspartate-terminated urea/urethane prepolymers and a polyisocyanate.
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