초록 ▼

Disclosed are novel compositions capable of catalytically trimerizing organic isocyanates said compositions comprising solutions of the reaction products obtained by reacting in an inert solvent in substantially equimolar proportions electron-rich ketene-aminals with electron-poor olefins having the

Disclosed are novel compositions capable of catalytically trimerizing organic isocyanates said compositions comprising solutions of the reaction products obtained by reacting in an inert solvent in substantially equimolar proportions electron-rich ketene-aminals with electron-poor olefins having the respective formulae (I) and (II) [Figure] (I) [Figure] (II) The variously substituted electron-rich ketene-aminals (I), as the name implies, have high electron density associated with the double bond because of the two tertiary amine groups while the electron-poor olefins (II) have the opposite situation due to the presence of electron withdrawing substituents R9 and R10. Also disclosed is an improved process for trimerizing organic isocyanates using the above catalyst compositions including the preparation of polyisocyanurate polymers and isocyanurate-modified polyisocyanates.

대표청구항 ▼

In a method for the trimerization of an aromatic polyisocyanate to a polyisocyanurate polymer in the presence of a trimerization catalyst the improvement which comprises employing as said catalyst a composition comprising a solution of the product obtained by reacting, in an inert solvent, substanti

In a method for the trimerization of an aromatic polyisocyanate to a polyisocyanurate polymer in the presence of a trimerization catalyst the improvement which comprises employing as said catalyst a composition comprising a solution of the product obtained by reacting, in an inert solvent, substantially equimolar proportions of ketene-aminal and an olefin having the respective formulae (I) and (II) [Figure] (I) [Figure] (II) wherein R1, R2, R3, and R4 when taken separately are independently selected from the group consisting of lower-alkyl, aralkyl, cycloalkyl, and, when taken together as R1 with R2 and R3 with R4 with the respective nitrogen atoms to which they are attached represent independently heterocyclic groups having 6 or 7 ring atoms, R5 and R6 are independently selected from the group consisting of hydrogen, lower-alkyl, aryl, aralkyl, and cycloalkyl, R7 and R8 when taken separately are independently selected from the group consisting of hydrogen, lower-alkyl, aryl, aralkyl, and cycloalkyl, provided that R7 and R8 are not both hydrogen at the same time, and, R7 and R8, when taken together with the carbon atom to which they are attached represent a cyclic hydrocarbon group having 5 or 6 carbon atoms in the ring, and R9 and R10 represent the same or different electron withdrawing groups.