Mitsui Toatsu Chemicals, Incorporated

Fumio Fujii

Akitoshi Igata

Hiroshi Aiga

Ken Mukai

Koji Kurahara

Toshihiro Koga

Tetsuo Watanabe

Surface active agents are obtained by reacting, in water as solvent and under normal pressure, cresol, formaldehyde, sodium sulfite, and 2-hydroxynaphthalene. The surface active agents exhibit excellent high dispersing power upon finely grinding with disperse dyes and in use at high temperatures whereby they are effective in giving level dyeing to polyester fibers in high temperature dyeing processes and give little or no cellulose staining in dyeing a polyester/cellulose blended yarn or fabric by the thermosol process.

Process for the preparation of surface active agents

Mixtures of water-insoluble monoazo dyestuffs are disclosed together with the dyeing, padding or printing of polyester material therewith. The water-insoluble monoazo dyestuffs of the following general formula (A) ##SPC1## in which Y represents hydrogen, chlorine, bromine, methyl, ethyl, methoxy, ethoxy or cyano; R.sub.1 represents methoxy, ethoxy or phenoxy; R.sub.2 represents methyl or ethyl; R.sub.3 represents hydrogen, methyl, ethyl, cyanoethyl or allyl; and R.sub.4 represents methyl, ethyl, propyl, butyl, allyl or phenyl, are suitable for the production of inexpensive navy shades of good fastness to light, washing, perspiration, sublimation and heat setting; however, difficulties sometimes arise in the case of these dyestuffs. The improvement disclosed comprises overcoming said difficulties and providing new navy shades by using a mixture of at least two dyestuffs, in one of which the Y constituent above is hydrogen and in the other of which the Y constituent is replaced by constituent X which represents chlorine, bromine, methyl, ethyl, methoxy, ethoxy or cyano.

Dyestuff mixtures and process for dyeing polyester fiber therewith

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Omuta, Japan

Fumio Fujii