CH321386A - Process for the preparation of a new aldehyde condensation product of guanyl melamines - Google Patents

Description

  

  <B> Process </B> for producing <B> a new </B> aldehyde condensation product <B> from </B> guanyhnelamines The subject matter of the present patent is a process for producing a mixture of aldehyde condensation products, which is indicated by the fact .ss one is a mixture of guanylmelamine hydrochlorides, as can be obtained by treating dicyandiamide in an inert solvent in the heat with gaseous hydrogen chloride,

   reacts with aqueous formaldehyde at an elevated temperature and then further condenses the resulting mixture of formaldehyde condensation products in the heat with triethylenetetramine tetrahydrochloride.



  The reaction of the mixture of guanyl inelamine hydrochlorides with formaldehyde and the subsequent further condensation with triethylamine tetramine tetrahydrochloride can be carried out, for example, in the manner

         1a1> 4 mol. Formaldehyde are allowed to act on 1 mol of a mixture calculated as monoguanyl inelamine hydrochloride of (_tuanylmelamine hydrochloride at 70 to 75 "in the presence of water, and then the formaldehyde condensate ion product with 1 mol triet.hy - lent.et.ramin-tetrahydrochloride condensed further.

      The mixture of aldehyde condensation products produced in this way represents a solid, water-soluble mass which can be used for making dyeings from direct dyes water-absorbent. In the following example, parts mean parts by weight, unless otherwise noted; the ratio between parts by weight and parts by volume is the same as that between the kilogram and the liter. The temperatures are given in degrees Celsius.



       EXAMPLE 10.2 parts of the mixture of guanylmelamine hydrochlorides described in more detail below, containing monoguanyl melamine hydrochloride as the main component, are dissolved at 70-75 in 15.6 parts of exactly neutralized 38.3% formaldehyde solution. As soon as a solution has entered, it is cooled, 7.3 parts of triethylenetetramine, which previously with conc. Hydrochloric acid have been neutralized, added and heated in a bath from 80-85 until the beginning of thickening.

   Then ver diluted with 20 parts of water and dried at 40-45 under reduced pressure. The drying should take place as quickly as possible to prevent insoluble fractions from forming. The solid residue thus obtained is soluble in boiling water.



  The new product can be used to make dyeings made from direct dyes waterfast.



  The above-described mixture of guanylmelamine hydrochlorides can be prepared as follows: A mixture of 160 parts of anhydrous pyridine and 240 parts of nitrobenzene is saturated at 90 ° with hydrochloric acid gas. After he warm to 110 at this tempera ture 100 parts of dicyandiamide are worn in small parts while passing hydrochloric acid gas. The procedure is such that a further addition of dicyandiamide only takes place when the reaction mixture is saturated with hydrochloric acid gas.

   After the end of the introduction, the mixture is heated to 110 for a further 15 minutes while passing hydrochloric acid gas through it, cooled to 50 and the separated solid fractions are separated from the mother liquor. These solid reaction products are dissolved in about 700 parts of water at 90-100, whereupon the pH is adjusted to 5-9 by adding ammonia solution. After a small amount of solid impurities has been separated off, the solution obtained is cooled to 5, whereupon the reaction product which separates out is separated off from the 1-Iutter liquor and dried.

 

Claims (1)

PATENT CLAIM Process for the preparation of a mixture of aldehyde condensation products, characterized in that a mixture of Cxuanylmelamin-hy drochloriden, as it is obtainable by treating dicyandiamide in an inert solvent in the heat with gaseous hydrogen chloride, at elevated temperature with . aqueous formaldehyde <B> hyd </B> and then the resulting mixture of formaldehyde condensation pr oducts is further condensed in the heat with triethylent.etramine tetrahydrochloride. The mixture of aldehyde condensation products produced in this way represents. a solid, water-soluble mass which can be used to make dyeings made from direct dyes waterfast. SUBSTANTIAL CLAIM Process according to patent claim, characterized in that 1 mol of a mixture of guanylmelamine hydrochlorides calculated as mono, uanylmelamine hydrochloride is allowed to act at 70-75 in the presence of water 4 -hol formaldehyde and then the formaldehyde condensation product with 1 mol of triethylenetetramine tetrahy droehlorid further condensed.