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AssigneeBayer Aktiengesellschaft
InventorsAndrea La Spina, Werner Dietrich, Reinhard Schliebs
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A compound adapted to be used to advantage as a catalyst for making carbodiimide foams is prepared by a process wherein A. a phosphetane oxide or phosphetane sulphide of the general Formulae I and II: ##EQU1## wherein X represents a C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.6 -C.sub.14 aryl, C.sub.7 -C.sub.20 aralkyl, C.sub.1 -C.sub.18 alkoxy or C.sub.6 -C.sub.14 aroxy group and R.sup.1 to R.sup.6 represent hydrogen and/or C.sub.1 -C.sub.4 alkyl groups and is reacted with B. a mono-, di- and/or polyhydric alcohol having a molecular weight of about 32 to about 250, a protonic acid which has a pH of between 1 and 8 in N/10 aqueous solution, a metal salt or an acid chloride.
In a process for making a rigid foam plastic which contains carbodiimide groups from an organic polyisocyanate, the improvement which comprises includig a catalytic amount of an addition compound of
The process of claimm 1 wherein the polyisocyanate is an undistilled phosgenation product of tolylene diamine or a mixture of tolylene-2,4- and/or -2,6-diisocyanate and 5% to 60% by weight of the distillation residue obtained from the production of tolylene diisocyanate.
A process of making a polycarbodiimide foam from an organic polyisocyanate which comprises heating the polyisocyanate in the presence of a catalytic amount of an addition compound of a phosphetane or phosphetane sulphide and an alcohol, a protonic acid adapted to form a N/10 aqueous solution having a pH of 1 to 8, a metal salt or an acid chloride.
Dependencies are inferred from the claim text.