Initiators for isocyanate reactions

Details Initiators for isocyanate reactions Initiators for isocyanate reactions

1976-06-14

1978-09-05

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 69, 528 73, 521902, 521121, 544215, C08G 1802, C08G 1806, C08G 1816

Patent

active

041119142

ABSTRACT:
The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.

REFERENCES:
patent: 3660431 (1972-05-01), Hatch et al.
patent: 3715337 (1973-02-01), Allen
patent: 3767622 (1973-10-01), Hatch et al.
patent: 3903056 (1975-09-01), Schmidt et al.
patent: 3915991 (1975-10-01), Schmidt et al.
patent: 3993652 (1976-11-01), Bechara et al.

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