METHOD FOR PRODUCING POLYISOCYANATES AND USE OF SAID POLYISOCYANATES
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United States of America Patent
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Jun 16, 2016
app pub date -
Jul 21, 2014
filing date -
Jul 25, 2013
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Abstract
The present invention relates to a method for producing polyisocyanates comprising iminooxadiazinedione groups, wherein at least one monomeric di- and/or tri-isocyanate is oligomerised in the presence of a) at least one catalyst, b) at least one additive (A) having a relative permittivity at 18° C. to 30° C. of at least 4.0, c) optionally further additives other than A. The invention relates further to a reaction system for producing polyisocyanates comprising iminooxadiazinedione groups, and to the use of an additive (A) having a relative permittivity at 18° C. to 30° C. of at least 4.0 for producing polyisocyanates comprising iminooxadiazinedione groups by catalysed modification of monomeric di- and/or tri-isocyanates.
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