Process for making yellow, basic azomethine dyes

Details Process for making yellow, basic azomethine dyes Process for making yellow, basic azomethine dyes

1976-03-22

1978-05-30

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 76, 8 79, 260164, 8 92, 8 93, C09B 2700, C08J 320

Patent

active

040921042

ABSTRACT:
A process for making yellow, basic azomethine dyes for paper, leather and textiles; the process being an improvement in the process of reacting an azo dye base precursor of the formula ##STR1## wherein A is phenyl or substituted phenyl, with dimethyl sulfate in solution, and in the presence of an acid-binding agent, the improvement comprising reacting dimethyl sulfate in a molar excess of from 100% to 300% per mole of precursor, in an aqueous solution having at least 30 weight percent water and from 2.0 to 3.5 moles of magnesium oxide (as the acid-binding agent) per mole of precursor.

REFERENCES:
patent: 3345355 (1967-10-01), Raue
patent: 3346322 (1967-10-01), Finkenauer et al.
patent: 3718642 (1973-02-01), Lehment et al.
patent: 3741982 (1973-06-01), Fujimo
patent: 3973903 (1976-08-01), Clarke

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