DE878937C - Process for the conversion of pigments into derivatives which are soluble or distributable in water - Google Patents

Description

Process for converting pigments into water-soluble or Distributable Derivatives It has been found that in water, achwerorkr .insoluble organic pigments, the reactive hydroxyl groups or primary or secondary Contain amino or amido groups or imido groups, especially in typographical terms valuable, water-soluble or four-part derivatives can be converted if you Reacts them with compounds in the presence of acidic or acid-releasing agents, which contain more than two methylol groups.

Colorless and colored pigments, e.g. B. Anth @ racliinon or pyrazole derivatives. Azofarbatoffe or imnidazole derivatives. Suitable Methylol compounds are e.g. B. hexamethylol acetone, the so-called enneaheptite, the tri- and tetramethylol derivatives of the acetylenic compounds, the hexamethylol derivative des: lfellitlisäureamids, the tetrametlivlole derivative of jetanetetracarboxamide or the tri- or tetramethylol derivative of butanetetracarboxamide.

The reaction can be carried out using inert solvents "are carried out". However, it is also possible to work with aqueous dispersions of the pigment. In general, it is carried out by heating the reaction mixture, e.g. B. on go to roo °. The amounts of Methylol compound and .the Implementation times and temperatures vary from case to case; let them can easily be determined through preliminary tests.

Due to the conversion into Aie, more easily soluble or distributable in water Derivatives, the use of the pigments for many purposes is made considerably easier. Above all, however, are those shown on cellulose or cellulose hydrate fibers Prints and dyeings are extremely washable if the fiber material is mixed with acidic solutions the product obtained is soaked and then heated to temperatures above zoo ° for a short time.

The parts used in the following examples are parts by weight. In the case of 10 parts of i-methylaminoanthraquinone, 10 parts of N-methylpyrrole @ i, don dissolved and with a solution of 10 parts tetramethylolacetylend.ih.'arnstoff in 10 parts of N-Methylpyrroli @ don added. Then 6 parts of 8% sulfuric acid are added stirred in. It is now heated to 100 ° until the red solution obtained is mixed with hot water remains clear. The dye which precipitates out on cooling turns acetate silk 0.n red Tones on. Examples 52 parts of tetramethylolacetylenidiurea and 24 parts of [, 5-diphenylimidazalone are dissolved in 8o parts of N-methylpyrrolidone and, after adding 10 g of glacial acetic acid Boiled on the reflux condenser for 1 hour. The solution thus obtained is with hot water dilutable. It can be used as a lightening agent for cellulose textiles. It is advantageous to add them to the treatment baths when they are refined. That However, the product can also be applied to cellulose fibers on its own and with additives an acidic catalyst can be fixed on the fiber by heating.

Claims (1)

PATENT CLAIM: Process for converting pigments: which contain reactive hydroxyl groups or primary or secondary amino or amido groups or imido groups into derivatives which are soluble or dispersible in water, characterized in that they are reacted with compounds in the presence of acidic or acid-splitting agents containing more than two methylol groups.