N-Acyl-o-phenylenediamines

Details N-Acyl-o-phenylenediamines N-Acyl-o-phenylenediamines

1979-11-08

1982-02-02

Edmundson, F.

Compositions

Organic luminescent material containing compositions

Optical brightening compositions

25230121, 25230127, C09K 1106

Patent

active

043138462

ABSTRACT:
The invention relates to N-acyl-o-phenylenediamines of the formula ##STR1## wherein A is a colorless carbocyclic or heterocyclic aromatic radical and each of R.sub.1 and R.sub.2 independently is an alkyl, alkenyl or phenyl radical which is unsubstituted or substituted by non-chromophoric groups, but only one of R.sub.1 and R.sub.2 can be phenyl, and the ring B can also be substituted by non-chromophoric groups. The invention also relates to processes for the manufacture of these compounds, their use for whitening man-made organic material, their conversion into benzimidazolium compounds as well as stable, concentrated aqueous solutions of such compounds, processes for their manufacture and their use for whitening man-made organic material.

REFERENCES:
patent: 3900419 (1975-08-01), Schlapfer et al.
patent: 3932446 (1976-01-01), Grychtol
patent: 3940417 (1976-02-01), Schlapfer
patent: 4001138 (1977-01-01), Lohmann
patent: 4189589 (1980-02-01), Meyer et al.
Chemistry of Heterocyclic Compounds, Weissberger, pp. 280-284, by Hofmann, Pub. by Interscience, New York, 1953.

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