Sumitomo Chemical Company, Limited

Junzaburo Seino

Hirohito Kenmochi

Masao Nishikuri

Kiyoteru Kojima

Kiyoyasu Hashimoto

Yoshio Mori

Iwao Minami

Michio Yamazaki

Katsunobu Sato

Kenji Yoshinaga

Hiroshi Ikeda

Washohati Abo

Joji Fuji

A compound of the formula, ##STR1## wherein R.sup.1 is methyl or ethyl, R.sup.2 and R.sup.3 are each C.sub.5 -- or C.sub.6 --alkyl, and Z is chlorine for use as a blue disperse dye of hydrophobic fibers, either alone or as a mixed dye in combination with anthraquinone; the compound combines low cost relative to anthraquinone with superior stability in the dye bath and excellent dyeability; mixed dyes retain anthraquinone-imparted brilliance of color, have good color fastness, dyeability and reproducibility characteristics, and maintain low cost.

2-Cyano-4-nitro-6-chlorophenylazo 3-acetyl-or

A method for producing dyestuff powders by spray drying a dye dispersion or solution characterized in that the spray drying is effected using a spray dryer comprising a drying room with an inlet for the introduction of hot air into the drying room and an outlet for the discharge of hot air with dyestuff powders from the drying room, an atomizer for spraying the dye dispersion or solution therethrough positioned at the upper part of the drying room and an accelerating means for increasing the velocity of the hot air. The production parameters are controlled so that the temperature at the inlet is between 110.degree. and 260.degree. C., the temperature at the outlet is between 60.degree. and 80.degree. C. and the velocity of hot air at the position just under or around the atomizer is between 5 and 80 m/sec.

Production of dyestuff powders

Styryl compounds represented by the following general formula (I): ##STR1## wherein X.sub.1 is a halogen atom or a lower alkyl or lower alkoxy group, X.sub.2, Y.sub.1 and Y.sub.2 are each a hydrogen or halogen atom or a lower alkyl or lower alkoxy group, R.sub.1 and R.sub.3 are each an unsubstituted or substituted alkyl group, and R.sub.2 is a straight or branched C.sub.3 -C.sub.10 alkylene group or an alicyclic hydrocarbon-containing alkylene group, a process for producing them, a process for dyeing and printing hydrophobic fibers by their use and a process for coloring synthetic resins by their use. According to said processes a clear yellow color of high fastness can be given to the fibers and synthetic resins.

Styryl compounds and coloring synthetic resins therewith

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Kishiwada, Japan

Junzaburo Seino