C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/248.7
C07D 251/34 (2006.01) C07D 273/04 (2006.01) C08G 18/02 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01)
Patent
CA 2008064
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.
L'invention porte sur une méthode pour produire un polyisocyanate renfermant le groupe isocyanurate. La méthode consiste : a) à faire réagir partiellement les groupes isocyanates d'un diisocyanate organique contenant des groupes isocyanates avec liaison aliphatique ou cycloaliphatique, en présence d'un catalyseur de trimérisation, à base de fluorure d'ammonium ou de phosphonium; b) à introduire du dioxyde de carbone dans le mélange réactionnel au moins à certains intervalles durant la réaction; c) à arrêter la réaction au degré de conversion souhaité. L'invention porte également sur des polyisocyanates renfermant le groupe isocyanurate, obtenus grâce à ce procédé.
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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