ES203884A1 - A procedure for the obtaining of tetrabenzoporphiracin salts used as coloring pigments (Machine-translation by Google Translate, not legally binding)
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A procedure for the obtaining of tetrabenzoporphiracin salts used as coloring pigments (Machine-translation by Google Translate, not legally binding)
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Process for obtaining tetrabenzoporphirazine salts, usable as dye pigments, consisting essentially of reacting phthalic anhydride with urea together with a metallic agent, preferably a metal salt, producing an exothermic reaction which, in certain phases or periods, must be maintained at temperatures determined of the order of 150º to 200º c., the reaction being developed in the presence or with the addition of high-boiling solvents in order to dilute the reactants and allow a better control of the temperature, whereby phthaloylurea is formed as a product unstable intermediate which, in the presence of the metal salt, leads to the phthalocyanine or detrabenzoporphirazine of the corresponding metal. (Machine-translation by Google Translate, not legally binding)
ES203884A1952-05-291952-05-29A procedure for the obtaining of tetrabenzoporphiracin salts used as coloring pigments (Machine-translation by Google Translate, not legally binding)
ExpiredES203884A1
(en)
Procedure for the manufacture of the indofenol-tiosulfºnic acids of the carbazol and N-alkil carbazol (Machine-translation by Google Translate, not legally binding)