Preparation of carbodiimide-containing polyisocyanates

Details Preparation of carbodiimide-containing polyisocyanates Preparation of carbodiimide-containing polyisocyanates

1978-04-10

1979-03-06

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260239A, 260453A, 260453AL, 260453AM, 260453AR, 252431R, 252426, 526 19, 526 42, 526240, 526 47, C07C119055

Patent

active

041430638

ABSTRACT:
A process is described for converting organic polyisocyanates to carbodiimide-containing polyisocyanates by heating said organic polyisocyanates in the presence of an organoarsine-substituted polystyrene carbodiimide-forming catalyst until a desired level of conversion is achieved, followed by separation of catalyst from product. It is thus possible to obtain a carbodiimide-containing polyisocyanate which is free from catalyst and hence free from the possibility that carbodiimide formation can continue on storage of the product. In a particular embodiment the process is employed to convert methylenebis(phenyl isocyanate), which is normally solid at ambient temperatures, to a storage stable liquid product. The polymeric catalysts employed in the process are characterized by a recurring unit of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydrocarbyl, R.sub.3 is hydrogen, chloro or methyl, R.sub.4 is hydrogen or methyl and n is 0 or 1.

REFERENCES:
patent: 3406198 (1968-10-01), Budnick

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