Process for the production of polyisocyanates containing allophanate groups
AssigneeMobay Corporation
InventorsWilliam E. Slack, Terry A. Potter, Kenneth L. Dunlap
Life of this patent
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Abstract
Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150.degree. C. for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100.degree. C. It is preferred that the reaction be carried out in the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.
Claims7
A process for the production of aliphatic and/or cycloaliphatic polyisocyanate containing aliphatically groups in which
- (a) an organic diisocyanate and/or polyisocyanate containing aliphatically and/or cycloaliphatically bound isocyanate groups
- is reacted with
- (b) an organic compound containing at least one hydroxyl group, which compound is otherwise inert with respect to isocyanate groups, of no more than
- at a temperature of at least 200.degree. C. for a period of no more than 30 minutes to form an allophanate and the resultant product is rapidly cooled to a temperature of less than 100.degree. C.
Dependencies are inferred from the claim text.