Polyisocyanates containing acylurea groups, a process for...

Details Polyisocyanates containing acylurea groups, a process for... Polyisocyanates containing acylurea groups, a process for...

2006-07-04

2006-07-04

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C560S336000

Reexamination Certificate

active

07071353

ABSTRACT:
The present invention relates to a process for preparing polyisocyanates containing acylurea groups by reacting isocyanates corresponding to formula (I)in-line-formulae description="In-line Formulae" end="lead"?R—(NCO)n,  (I)in-line-formulae description="In-line Formulae" end="tail"?whereinR represents an n-valent linear or branched aliphatic group or cycloaliphatic group having 4 to 30 carbon atoms or an aromatic group having 6 to 24 carbon atoms andn is 1, 2, 3 or 4,with aliphatic and/or aromatic carboxylic acids in the presence of a metal salt catalyst at a temperature of 20 to 220° C.The present invention also relates to the reaction products (polyisocyanates) prepared by this process and to their use as binders for polyurethane coating compositions.

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