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US 2014/0275525 A1Published application
Method for producing polyisocyanates and use thereof
AssigneeBayer Intellectual Property GmbH
InventorsFrank Richter, Martin Brahm
Life of this patent
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Abstract
The invention relates to a method for modifying isocyanates using catalysts having a water content not exceeding 1,000 ppm.
Claims12
-11. (canceled)
A method for preparing polyisocyanates comprising iminooxadiazinedione groups by oligomerization of monomeric di- and/or triisocyanates comprising utilizing a catalyst, wherein the water content of the catalyst added to the isocyanates to be oligomerized does not exceed 1000 ppm.
A method for preparing polyisocyanates containing iminooxadiazinedione groups which comprises reacting
- a) at least one organic di- and/or triisocyanate,
- b) one or more catalyst having water contents not exceeding 1000 ppm in total,
- c) optionally a solvent and
- d) optionally an additive.
1 more element
Dependencies are inferred from the claim text.