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Patents for the Year 1905

I. DYESTUFFS AND COLORING-MATTERS.

ANTHRAQUINONE DYE AND PROCESS OF MAKING

SAME.

Heinrich Weltz, of Ludwigshafen-on-the-Rhine,

Germany,

assignor to Badische Anilin und Soda Fabrik. Patent No. 779,825, dated January 10, 1905.

The inventor has found that the polyhydroxy-anthraquinone sulpho-acid described in the specification of Letters Patent No. 754,264, March 8, 1904, which can be obtained by acting on anthraquinone-beta-mono-sulpho-acid with concentrated sulphuric acid, mercury or mercuric salts, and nitrous acid in the presence of arsenic acid or phosphoric acid, can be condensed with the sulpho-acids of aromatic amins, which term includes the salts of such sulpho-acids, giving rise to new coloring-matters soluble in water. The condensation can be effected, for example, either in the presence or in the absence of water and with the addition or not of a condensation agent. These coloring matters dye unmordanted wool in bluish-red shades, chrome-mordanted wool in reddish-blue shades, and alumina-mordanted wool in violet shades.

VIOLET SULPHUR DYE AND PROCESS OF MAKING SAME.

Arthur Lüttringhaus, of Ludwigshafen-on-the-Rhine, Germany, assignor to Badische Anilin und Soda Fabrik. Patent No. 779,860, dated January 10, 1905.

The inventor has discovered that if equimolecular proportions of ortho-ortho-dichlor-para-phenylene-diamin and a phenol be oxidized together the reaction proceeds smoothly and there are obtained large quantities of new indophenols which are stable and which when treated with sulphur and alkali sulphide give rise to new sulphurized dyestuffs which have great coloring power and great affinity for cotton. The said new indophenols can be very easily reduced, and the resulting diphenylamin derivatives can be used instead of the corresponding indophenols in the preparation of the said new sulphurized dyestuffs.

These dyestuffs in sodium-sulfid solutions dye unmordanted cotton greenish-gray to bluish-gray shades, which on exposure to the air rapidly turn deep violet.

SENSITIZING DYE.

Rudolf Berendes, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 780,741, dated January 24, 1905.

The process for the production of the new materials consists in causing caustic alkalies to act on the ammonium compounds, which can be prepared by heating quinaldin, the homologues, or substituted derivatives thereof with esters of suphonic acids, such as the ethylicester of ethyl sulphonic acid.

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the methylic or ethylic ester of benzene or toluene sulfonic acid, or the like. One can also employ a mixture of the above-mentioned ammonium bases with one another or with the corresponding derivatives of quinolin, which can be obtained by the action of esters of sulphonic acids upon quinolin or its derivatives, such as bromoquinolin or the like. The new sensitizing-dyestuff thus produced are dark crystals which dye silk from a faintly-ammoniacal bath red and color the silver compounds of photographic emulsions red, thereby imparting greater sensibility to photographic emulsions for distinct colors of the spectrum.

ORANGE SULPHUR DYE AND PROCESS OF MAKING SAME.

Richard Gley, of Berlin, Germany, assignor to Actien Gesellschaft für Anilin Fabrikation. Patent No. 782,905, dated February 21, 1905.

The inventor claims that new sulphurized dyestuffs are formed if mixtures of meta-toluylenediamin and diformyl-para-phenylepediamin are heated together with sulphur at high temperatures. The reaction product is, especially if well pulverized, directly soluble in an aqueous solution of sodium sulphide and dyes cotton clear orange-yellow shades of great intensity.

GREENISH-BLUE ANTHRAQUINONE DYE.

Robert E. Schmidt, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 785,121, dated March 21, 1905.

This invention relates to the manufacture of a new dyestuff which can be obtained by treating with formic aldehyde and sulphuric acid the blue dye obtainable by heating 1-3-dibromo2-amidoanthraquinone with cupric chlorid, nitrobenzene, and sodium acetate as described in U. S. Patent No. 775,369.

Upon treatment with hydrosulphite of sodium in an alkaline solution the new product is transformed into its hydro compound, a greenish-blue vat being thus obtained which dyes cotton greenishblue pure and fast shades of a greener tint than those obtained with the aid of the initial material.

GREEN-BLUE ANTHRAQUINONE DYE.

Robert E. Schmidt, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 785,122, dated March 21, 1905.

This invention relates to the manufacture of a new dyestuff which can be obtained by treating with formic aldehyde and sul

phuric acid the blue dye obtainable by melting beta-amidoanthraquinone with caustic potash, Patent No. 682,523.

Upon treatment with hydrosulphite of sodium and caustic-soda lye the dyestuff is transformed into its hydro compound, a greenish-blue vat being thus obtained which dyes cotton greenishblue pure and fast shades.

GREEN ANTHRAQUINONE DYE.

Robert E. Schmidt, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., New York, N. Y. Patent No. 785,123, dated March 21, 1905.

This invention relates to the manufacture of a new dyestuff which can be obtained by treating with formic aldehyde and sulphuric acid the green dyestuff obtainable by heating 1-4-diamido2-3-dibromoanthraquinone with cupric chlorid, nitrobenzene, and sodium acetate, as described in U. S. Patent No. 775,367.

Upon treatment with hydrosulphite of sodium and caustic-soda lye it is transformed into its hydroproduct, a violet-blue vat being thus obtained which dyes cotton pure-green fast shades.

ORANGE SULPHUR DYE AND PROCESS OF MAKING SAME.

August Leopold Laska, of Offenbach-on-the-Main, Germany, assignor to the firm of K. Oehler, Anilin und Anilinfarben Fabrik. Patent No. 785,675, dated March 21, 1905.

This invention has reference to the manufacture of sulphur dyes, and is based upon the discovery that the azo dyes resulting from the combination of the diazo compounds of easily-volatile aromatic amins with mono-acetyltoluylendiamin (CH, NH2: NH.COCH,— 1:2:4;) are very suitable for the production of valuable orange sulphur dyes.

The process consists in heating to higher temperatures these azo dyes together with sulphur advantageously in the presence of bases

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