CH335796A - Use of heterocyclic compounds as pigment dyes for dyeing viscose rayon in bulk and for dyeing and printing paper and cardboard - Google Patents

Description

  

  The use of heterocyclic compounds as pigment dyes for dyeing viscose rayon in bulk and for dyeing and printing paper and cardboard Phthaloperinones and naphthaloperinones which may be substituted but free from water-solubilizing groups are known per se. They are generally unstable to chemical agents and are chemically changed, for example, when they are reprecipitated from sulfuric acid.



  It has now surprisingly been found that viscose rayon can be dyed in bulk with phthaloperinones and naphthaloperinones which are optionally substituted but free from water-solubilizing groups, without these undergoing any change in the cellulose xanthate solutions.

   Furthermore, the above-mentioned phthaloperinones and naphthaloperinones are also suitable for dyeing paper in bulk and for dyeing and printing all types of paper and cardboard. The present patent thus relates to the use of phthaloperinones and naphthaloperinones, which may be substituted but free of water-solubilizing groups, for dyeing viscose rayon in bulk and for dyeing and printing paper and cardboard.



  The phthaloperinone corresponds to the formula
EMI0001.0027
    and the naphthaloperinone of the formula
EMI0001.0029
    The phthaloperinones and naphthaloperinones mentioned can be converted into finely divided form in such a way that the technical products are dissolved in a water-miscible organic solvent, optionally at an elevated temperature, and the resulting solution is discharged onto water, the product is filtered off, washes and kneaded with a dispersant.

   The paste obtained can then be dried under normal pressure, in vacuo or by atomization. Another way of converting the phthaloperinones into finely divided form is that the technical phthaloperinones are dry or moist, in the presence of dispersants and optionally fillers and / or grinding aids,

      comminuted by grinding and / or kneading and the grinding process is optionally followed by a drying process customary in pigment manufacture. The dye preparations thus obtained contain the phthaloperinones and naphthaloperinones mentioned in particles of the order of 1 j.c. The following examples explain the present invention. Parts are parts by weight.



  <I> Example 1 </I> 10 parts of phthaloperinone, 10 parts of sodium dinaphthyl methanedisulphonic acid and 30 parts of water are pressed through a roller mill until a paste is formed which gives a perfect leak test.

   This is determined in such a way that 0.5 cm3 of paste is mixed in 10 cm3 of water and 1 cm3 of the resulting colloidal solution is allowed to run out onto filter paper No. 5892 (Schleicher and Schuell) of 11 cm3. The filter paper should be evenly colored; no rings should be visible.



  21 parts of the 20 percent dye paste are now mixed with 225 parts of viscose solution containing 20 parts of pure α-cellulose. You let the mass stand and then spin it in the usual way. Threads with a lively orange color are obtained, which is very fast to light and sublimation.



  <I> Example 2 </I> 2 parts of phthaloperinone are ground with 98 parts of barium sulfate to give a finely dispersed powder. The ground product is then mixed with animal glue or with another binder commonly used in the paper industry to form a paste and spread on paper or cardboard. A lively orange glue spread is obtained, which is outstandingly lightfast and sublimation fast.

 

Claims (1)

PATENT CLAIM Use of phthaloperinones and naphthaloperinones which have been converted into finely divided form, optionally substituted but free of water-solubilizing groups, as pigment dyes for dyeing viscose rayon in bulk and for dyeing and printing paper and cardboard.