Hoechst Aktiengesellschaft

Walter Deucker

Ernst Spietschka

Willi Steckelberg

Helmut Troster

Ernst Hoyer

Rudolf Schickfluss

Dieter Steidl

Rudolf Lowenfeld

Kurt Walter Klupfel

Heide Sprengel

Hansjorg Vollmann

The invention relates to a yellow monoazo pigment which is obtained by diazotization of 2-amino-4-chloro-5-methylbenzene-1-sulfonic acid, coupling of the diazonium compound with 1-(3'-sulfophenyl)-3-methyl-5-pyrazolone and subsequent laking of the coupling product to the calcium salt. The new pigment has excellent heat stability and bleeding fastness and good light stability. It is particularly suitable for the pigmenting of polymeric plastics in the mass.

Laked pyrazolone azo pigment, process for its preparation and its use

A process for the dyeing or printing of a hydrophobic organic fibrous material containing or consisting of polyester, wherein

Process for the dyeing and printing of hydrophobic synthetic organic

The present invention relates to a photopolymerizable mixture comprising a compound with at least two terminal ethylenically-unsaturated groups, a boiling point above 100.degree. C. and which is capable of addition polymerization, a polymeric binder, a photoinitiator, and a monoazo dye corresponding to Formula I: ##STR1## R.sub.2 and R.sub.3 are alkyl or alkenyl groups which may be substituted, and R.sub.4 and R.sub.5 are hydrogen or halogen atoms, or alkyl or alkoxy groups.

Photopolymerizable composition comprising a monoazo dye as contrast

Process for the dyeing and printing of synthetic fibrous materials, wherein the said fibrous materials are treated with an aqueous dispersion, an aqueous padding liquor or with a solution in an organic solvent of at least one dyestuff of the formula ##STR1## in which R.sub.1 represents hydrogen, chlorine, lower alkyl or --NH--CO-lower alkyl, R.sub.2 represents hydrogen, lower alkyl or lower alkoxy, R.sub.3 represents lower alkyl, lower alkylene-OH, lower alkylene-CN, --CH.sub.2 --CBr.dbd.CH.sub.2, ##STR2## or lower alkylene-COO-lower alkyl, R.sub.4 represents hydrogen, bromine or lower alkyl, and R.sub.5 represents hydrogen, lower alkyl or phenyl, this process yielding violet to bluish-green, preferably reddish to greenish dark blue dyeings and prints of high tinctorial strength and excellent fastness properties on the said fibrous materials, such as fibers of linear polyesters, cellulose esters and polyamides.

Process for dyeing and printing synthetic fiber materials

A continuous process for preparing copper phthalocyanines by caking a mixture of phthalodinitrile, and a copper salt which comprises carrying out the reaction in a continuously working, heatable, tubular vibration mill, which contains iron or steel bars in the grinding room. In comparison with the continuous processes hitherto known this process requires a considerably smaller amount of thermal energy from outside, since the amount of heat formed in the strongly exothermic condensation process is, to a considerable extent conducted away from the reaction zone, with the aid of heat-conducting grinding bars, and is used in order to heat up the freshly introduced starting product to room temperature.

Continuous process for preparing copper phthalocyanine

A process for the preparation of 4-bromo-naphthalic acid anhydride by bromination of an alkali metal salt of naphthalic acid in an aqueous medium at a pH of 6.8 to 9 by dropwise adding 0.55 to 0.65 mol of bromine per mol of naphthalic acid and oxidizing the bromine at the same pH-value with chlorine. By this process 4-bromo-naphthalic acid anhydride can be obtained in a quantitative yield whereby the formation of 4-chloro-naphthalic acid is avoided.

Growing community of inventors

Bad Soden am Taunus, Germany

Walter Deucker