Process for the preparation of allophanates which contain isocya

Details Process for the preparation of allophanates which contain isocya Process for the preparation of allophanates which contain isocya

1978-06-29

1979-07-03

Cockeram, H. S.

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...

260453P, 260453AL, 528 67, C08G 1879, C07C11800

Patent

active

041600800

ABSTRACT:
The present invention relates to a process for the preparation of allophanates containing aliphatically and/or cycloaliphatically bound isocyanate groups by the reaction of organic compounds containing urethane groups with organic polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups, characterized in that the reaction is carried out in the presence of strong acids which form a mixed carbamic acid anhydride with aliphatic or cycloaliphatic isocyanates. The present invention also relates to the allophanates produced therefrom.

REFERENCES:
patent: 3734941 (1973-05-01), Sydor
patent: 3883571 (1975-05-01), Allport et al.
D.O.S. 2,009,179, Bayer A/G, Sep. 16, 1971.
D.O.S. 2,040,645, Bayer A/G, Mar. 9, 1972.
Kogon, Journ. Am. Chem. Soc., vol. 78, 1956, pp. 4911-4914.

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