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Manufacture of stable diazo-salt preparations. IG Farbenindustrie, January 13, 1936: GB441085-A (53 worldwide citation)

Stable diazo-salt preparations are made by diazotizing a mono-, di- or polyhalogenaminobenzene, a nitroaminobenzene, a dihalogentoluidine, a dihalogen aminophenolether, a 1-amino-2- or 4-methyl-3-halogenbenze, a 1-amino-5-chloro-2-alkoxy- or aryloxybenzene, a 1-amino-2-nitro-4- or 5-halogenbenzene, ...


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Manufacture of solid stable diazo-azo-salts. IG Farbenindustrie, October 12, 1933: GB399753-A (52 worldwide citation)

Solid stable diazoazo salts are made by adding to an aqueous solution of diazotized o- or m-aminoazotoluene, sufficient sulphuric acid to form the acid diazonium sulphate, separating the solid diazoazo salt and mixing it, if necessary, with a diluent or dyeing assistant. Examples are given. The prod ...


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Manufacture of stable diazo-salt preparations. IG Farbenindustrie, October 29, 1928: GB275245-A (44 worldwide citation)

275,245. I. G. Farbenindustrie Akt.- Ges. Aug. 2, 1926, [Convention date]. Diazonium salts.-Stable preparations of diazo salts are made by adding a solid free arylsulphonic acid, alone or mixed with a readily-soluble salt, to a solid naphthalene sulphonate of a diazo compound. In examples (1) a mixt ...


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Tooth cleansing agents. IG Farbenindustrie, August 15, 1938: GB490384-A (36 worldwide citation)

A tooth-cleansing agent comprises as tartar-dissolving agent, a water-soluble salt of an amino methylene carboxylic acid which contains at least two methylene carboxylic acid groups, and in which the ratio between the number of the methylene carboxylic acid groups and the basic nitrogen atoms is at ...


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Improvements in the catalytic oxidation of ketones. IG Farbenindustrie, August 23, 1934: GB415172-A (35 worldwide citation)

Apparatus for the oxidation by means of air or oxygen of cycloaliphatic ketones to dibasic acids in presence of an oxidation catalyst, comprises a vertical cylinder with a fritted glass filter at the bottom for dispersing the oxidizing gas. The cylinder may be of glass, ceramic material, or alloys s ...


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Process for chlorinating and brominating hydrocarbons. IG Farbenindustrie, November 15, 1937: GB474922-A (30 worldwide citation)

In the chlorination or bromination of saturated aliphatic hydrocarbons having 3 or more carbon atoms in the vapour phase at temperatures at which the product is separated by condensation at the instant of formation, the halogen is blown into the reaction space through one or more capillaries in coun ...


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Manufacture of vat-dyestuffs and intermediate products. IG Farbenindustrie, July 4, 1929: GB288215-A (27 worldwide citation)

288,215. I. G. Farbenindustrie Akt.- Ges. April 4, 1927, [Convention date]. Samples furnished. Thioindigo dyes; thionaphthenes; thioglycollic acids. - 4-Methyl-5-halogenhydroxythionaphthene is prepared by ring closure of a compound having the general formula:- wherein Hlg. stands for halogen and X f ...


10
Improvements in the production of esters of silicic acid. IG Farbenindustrie, October 18, 1928: GB298778-A (25 worldwide citation)

298,778. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). Oct. 24, 1927. Silicic acid esters.-The manufacture of silicic acid esters by the interaction of silicon tetrachloride and alcohols is performed in the presence of inert diluents, whereby the necessity for dehydrating the alcohols is avoide ...