CH127534A - Colored varnish and process for its manufacture. - Google Patents

Description

  

  Colored varnish and process for its manufacture. It is known that for the production of lightfast colored paints (which can be made on a cellulose or phenolaldehyde basis), aminoanthraquinones can be used.



  The important observation has now been made that extremely lightfast yellow to blue-red colored paints can be produced, if paints are colored with those dyes which correspond to the general formula R, -N = NR .., in which R1 is the aromatic nucleus a negatively substituted, unsulfated diazo compound and R2 is any aromatic amine coupling in the 4-position to the amino group.



  <I> Example </I> .1: 4 to 5 parts of the dye obtainable by combining diazotized p-nitroaniline and cresidine are dissolved in 1000 parts of finished zapon varnish. The liquid obtained in this way, applied in a thin layer to a wide variety of substrates (metal, glass, leather, wood, celluloid, silk, etc.), leaves a transparent coating when it dries, the intense scarlet red color of which is extremely lightfast. By incorporating suitable additives, the transparent lacquer can be converted into a matt or top lacquer.



  <I> Example 2 </I> The mixture is added, optionally with the addition of further solvents and the usual plasticizing or Plasticizer, a nitrocellulose solution with an acetic one. Solution of 4-nitro-4'-aminoazobenzene. The varnish obtained in this way is used for the manufacture of orange-red coatings of excellent lightfastness.



  Similar results are obtained with lacquers made from acetyl cellulose or from phenol-aldehyde condensation products. In the latter case, the colorations resist the various hardening processes.



  Yellow lacquers are obtained with products such as 2.5-dichloro-4'-aminoazobenzene or. 2.5- dichloro-4'-amino-3'-methylazobenzene, orange colored with 3-nitro-4'-aminoazobenzene, sharp red with 4-nitro-4'-amino-2'-acetylamino-azobenzene, blue-red with 4- Nitro-2-methoxy-4'-dialkylaminoazobenzene etc.

   The azo dyes from unsulfated negatively substituted diazo compounds and diphenylamines, and also from benzyl or benzyl, are also suitable. Ethylbenzyl- respectively. Dibenzylaniline.

 

Claims (1)

PATENT CLAIMS: I. Dyed, lightfast paint, characterized in that it contains such a dye which corresponds to the general formula R, -N = N-R2, in which R, the aromatic nucleus of a negatively substituted one; unsulfated diazo compound, and R2 is any aromatic amine which couples in the 4 position to the amino group. Il. Process for the production of a colored lightfast paint according to claim I, characterized in that one. Lacquer with a dye of the general formula R, -N = N-R2, in which R, the aromatic nucleus of a negatively substituted, unsulfated diazo compound, and R_ # any aromatic amine coupling in the 4-position to the amino group means, colors.