Catalyst-reactant systems for the preparation of carbodiimide fo

Details Catalyst-reactant systems for the preparation of carbodiimide fo Catalyst-reactant systems for the preparation of carbodiimide fo

1974-10-02

1976-01-20

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

252426, 260 25AC, C08G 1814, C08G 1818, C08G 1820

Patent

active

039336999

ABSTRACT:
Rigid cellular foams characterized by carbodiimide linkages are prepared by the catalytic condensation of an organic polyisocyanate in the presence of a catalytically sufficient amount of a carbodiimide catalyst and an exotherm generating reactant which is either (a) an oxazolidine or (b) an enamine. The foams hereof are characterized by excellent flame retardancy, weight retention and low friability.

REFERENCES:
patent: 3020262 (1962-02-01), Speranza
patent: 3314901 (1967-04-01), Daumiller
patent: 3743626 (1973-07-01), Emmons
patent: 3793236 (1974-02-01), Ashida
Roberts & Caserio, Basic Principles of Organic Chemistry, W. A. Benjamin Inc. N.Y., 1965, pp. 486-487.

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