| http://www.w3.org/ns/prov#value | - Polar solvents, such as dimethylformamide, together with -0.1% by weight (to 100% by weight of isocyanate compound) of tertiary amine or with 0.1 to 10 g of alkali hydroxides, alkali silicates, or alkali cyanides are used as catalysts in DE-OS 3,223,398.
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