Process for the preparation of polyisocyanates containing biuret

Details Process for the preparation of polyisocyanates containing biuret Process for the preparation of polyisocyanates containing biuret

Filed on

1979-12-19

Date issued

1982-07-20

Examiner

Torrence, Dolph H.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

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

Other Related Categories

260453AB, 521160, 528 59, 544388, 548341, 560125, 560169, C08G 1878, C07C12722

Type

Patent

Status

active

Patent number

043407129

Description

ABSTRACT:
A process for the preparation of polyisocyanates containing biuret and/or higher polyuret groups by reacting secondary diamines with diisocyanates characterized in that the reaction is carried out in the presence of catalytic quantities of strong acids which form mixed carbamic acid anhydrides with isocyanates. Alternatively, the secondary diamines may be reacted with organic diisocyanates in the absence of catalysts to form a urea diisocyanate which is then reacted in the presence of catalytic quantities of strong acids which form mixed carbamic acid anhydrides either with the same diisocyanate used in the first step or a second diisocyanate. The invention also relates to the polyisocyanates containing biuret and/or higher polyuret groups obtainable by this process.

REFERENCES:
patent: 3124605 (1964-03-01), Wagner
patent: 3358010 (1967-12-01), Britain
patent: 3862973 (1975-01-01), Dietrich et al.
patent: 3903126 (1975-09-01), Woerner et al.
patent: 3903127 (1975-09-01), Wagner et al.
patent: 4051165 (1977-09-01), Wagner et al.
patent: 4147714 (1979-04-01), Hetzel et al.
patent: 4220749 (1980-09-01), Reichmann

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