Process for the preparation of isocyanates containing uretdione

Details Process for the preparation of isocyanates containing uretdione Process for the preparation of isocyanates containing uretdione

Filed on

1993-05-10

Date issued

1996-01-16

Examiner

Gupta, Yogendra N.

Patent Class

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

SubClass

Organic compounds

SubSubClass

Heterocyclic carbon compounds containing a hetero ring...

Other Related Categories

525186, 5253276, C07D22900

Type

Patent

Status

active

Patent number

054849160

Description

ABSTRACT:
In a process for the preparation of polyisocyanates containing uretdione groups by catalytic dimerization of monomeric isocyanates, the catalysts employed are polymers carrying imidazole groups.

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patent: 4894429 (1990-01-01), Grogler et al.
patent: 4912210 (1990-03-01), Disteldorf et al.
patent: 4929724 (1990-05-01), Engbert et al.
patent: 5106875 (1992-04-01), Horn et al.
patent: 5149766 (1992-09-01), Bruchmann
Synthesis, 463-464, 1975.
Recent Advances In Isocyanate Chemistry, Chemical Review, 47-73, 1957.
Chemical Abstracts Registry, 1994.
Dictionary of Organic Compounds, vol. 3, Fifth Edition, pp. 3287-3288, 1982.
Chemsources U.S.A., 1994 Edition.

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