Process for the production of polyisocyanates with biuret struct

Details Process for the production of polyisocyanates with biuret struct Process for the production of polyisocyanates with biuret struct

1987-12-30

1989-06-06

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C119042

Patent

active

048373591

ABSTRACT:
Polyisocyanates with biuret structures are produced at temperatures above 250.degree. C. More specifically, an excess of a diisocyanate having aliphatically and/or cycloaliphatically bound isocyanate groups is reacted with a diamine containing aliphatically and/or cycloaliphatically bound amino groups at temperatures above 250.degree. C. for relatively brief periods of time. Water and/or polyvalent alcohols may optionally be included in the reaction mixture. The polyisocyanates with biuret structures produced by this process are characterized by good color, good dilutability with covalent solvents and comparatively low viscosity.

REFERENCES:
patent: 3392183 (1968-07-01), Windemuth et al.
patent: 3903126 (1975-09-01), Woerner et al.
patent: 4147714 (1979-04-01), Hetzel et al.
patent: 4264519 (1981-04-01), Hennig et al.

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