Process for the production of polyisocyanates having a biuret st

Details Process for the production of polyisocyanates having a biuret st Process for the production of polyisocyanates having a biuret st

1998-02-13

1999-11-30

Gorr, Rachel

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...

560335, C08G 1832

Patent

active

059944919

ABSTRACT:
A process for the production of polyisocyanates having a biuret structure, comprising continuously combining organic diisocyanates having aromatically attached isocyanate groups in a mixing chamber with organic diamines having aromatically attached amino groups in a molar ratio of at least 8:1 to form a reaction mixture; and reacting said reaction mixture at a temperature of above 180.degree. C., wherein a residence time of said reaction mixture in the mixing chamber from when said organic diisocyanates and said organic diamines are combined is at most 60 seconds.

REFERENCES:
patent: 3954825 (1976-05-01), Touhey et al.
patent: 4264519 (1981-04-01), Hennig et al.
patent: 4618706 (1986-10-01), Scholl et al.

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