Polyisocyanates containing isocyanurate groups and a process for their production
AssigneeBayer Aktiengesellschaft
InventorHans-Joachim Scholl
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Abstract
The present invention relates to a process for the production of an isocyanurate group-containing polyisocyanate by (a) partially reacting the isocyanate groups of an organic diisocyanate containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of an ammonium or phosphonium fluoride trimerization catalyst, (b) introducing carbon dioxide into the reaction mixture at least periodically during the reaction and (c) terminating the reaction at the desired degree of conversion. The present invention also relates to the isocyanurate group-containing polyisocyanates obtained in accordance with this process.
Claims24
A process for the production of an isocyanurate group-containing polyisocyanate which comprises
- (a) partially reacting the isocyanate groups of an organic diisocyanate containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of an ammonium or phosphonium fluoride trimerization catalyst,
- (b) introducing carbon dioxide into the reaction mixture at least periodically during the reaction and
- (c) terminating the reaction at the desired degree of conversion.
A polyisocyanate mixture containing isocyanurate and oxadiazinetrione rings in a ratio of 0.01 to 10 oxadiazinetrione rings for each isocyanurate ring which is prepared by a process which comprises
- (a) partially reacting the isocyanate groups of an organic diisocyanate containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of an ammonium or phosphonium fluoride trimerization catalyst,
- (b) introducing carbon dioxide into the reaction mixture at least periodically during the reaction and
- (c) terminating the reaction at the desired degree of conversion.
Dependencies are inferred from the claim text.