Water soluble laser dyes

Details Water soluble laser dyes Water soluble laser dyes

1993-10-27

1998-08-11

Tucker, Philip

Compositions

Light transmission modifying compositions

252587, 252589, 544 99, 544102, 544103, 544104, 549382, 549383, 549390, 549394, F21V 900, C07D26534, C07D31178

Patent

active

057923892

ABSTRACT:
Novel water soluble dyes of the formula I are provided ##STR1## wherein R.sup.1 and R.sup.4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R.sup.1 -R.sup.2 or R.sup.2 -R.sup.4 form part of aliphatic heterocyclic rings; R.sup.2 is hydrogen or joined with R.sup.1 or R.sup.4 as described above; R.sup.3 is --(CH.sub.2).sub.m --SO.sub.3.sup.-, where m is 1 to 6;

REFERENCES:
patent: T856047 (1968-11-01), Wallace et al.
patent: 3681347 (1972-08-01), Herz et al.
patent: 3772335 (1973-11-01), Meininger et al.
patent: 3956300 (1976-05-01), Austin et al.
patent: 4256882 (1981-03-01), Friedrich et al.
patent: 4362873 (1982-12-01), Belfort
patent: 4386216 (1983-05-01), Locatell, Jr. et al.
patent: 4622395 (1986-11-01), Bellus et al.
patent: 5149807 (1992-09-01), Hammond et al.

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