Diisocyanates of the diphenyl methane series and processes for t

Details Diisocyanates of the diphenyl methane series and processes for t Diisocyanates of the diphenyl methane series and processes for t

1981-08-07

1986-05-06

Torrence, Dolph H.

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

Organic compounds

Isocyanate esters

560359, C07C11802, C07C119048

Patent

active

045870586

ABSTRACT:
A diisocyanate corresponding to the general formula: ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 represent hydrogen or a C.sub.2 -C.sub.12 alkyl group provided that two of the radicals R.sub.1, R.sub.2 and R.sub.3 represent hydrogen and the third represents an alkyl group containing from 2 to 12 carbon atoms. Mixtures of diisocyanates in which the described diisocyanate is a major substituent are also within the scope of this disclosure. Such compounds and mixtures are made by reacting a nitrobenzyl halide, an unsubstituted benzyl halide or a benzyl alcohol in the presence of a Friedel-Crafts catalyst with an alkylbenzene or a nitroalkylbenzene and then converting the nitro groups to amino groups by hydrogenation or reduction. The thus-produced amino compound is then phosgenated to form the diisocyanate.
The compounds and mixtures of the present invention are useful in the production of polyurethane plastics.

REFERENCES:
patent: 2683144 (1954-07-01), Balon et al.
patent: 3152162 (1964-10-01), Fischer et al.
patent: 3180883 (1965-04-01), Case
patent: 3255226 (1966-06-01), McShane, Jr.
patent: 3375264 (1968-03-01), Sayigh et al.
patent: 3644457 (1972-02-01), Konig et al.

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