Process for the production of polyisocyanates containing allopha

Details Process for the production of polyisocyanates containing allopha Process for the production of polyisocyanates containing allopha

1987-08-12

1989-03-07

Shippen, Michael L.

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

Organic compounds

Carboxylic acid esters

560 25, 560 26, 560115, 560158, 560159, C07C12722

Patent

active

048108200

ABSTRACT:
Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150.degree. C. for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100.degree. C. It is preferred that the reaction be carried out in the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.

REFERENCES:
patent: 2784163 (1957-03-01), Reynolds
patent: 2947714 (1960-08-01), Leclercq
patent: 3644490 (1972-02-01), Schmelzer
patent: 3769318 (1973-10-01), Windemuth et al.
patent: 4152350 (1979-05-01), Mohring
patent: 4160080 (1979-07-01), Koenig et al.
patent: 4177342 (1979-12-01), Bock et al.
patent: 4695645 (1987-09-01), Merger
Ault, "Techniques and Experiments for Organic Chemistry," 4th Ed, pp. 294-296 (1983).
Perry, "Chemical Engineers' Handbook," 5th Ed, 4-20 to 4-29 (1973).

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