DE533801C - Process for coloring resin solutions lightfast - Google Patents

Description

Method of staining resin solutions lightfast It has so far been very difficult; Resin solutions, such as those found in commercial alcohol and oil varnishes, to dye lightfast with soluble dyes, because the usual ones used for this Dyes usually undergo a change in a short time.

As has now been found, you can find resin solutions with basic groups containing azo or anthraquinone dyes that do not have a sulfo or carboxyl group contain, lightfast dye if you use organic before, during or after dyeing Treated derivatives of ammonia. Among basic anthraquinone dyes are z. B. aminoanthraquinones, arylaminoanthraquinones, alkylaminoanthraquinones or aralkylaminoanthraquinones to understand, which contain the rest of the anthraquinone only once in the molecule.

By adding organic derivatives of ammonia, the Coloring of the resin solutions is much more permanent. While z. B. equal percentage Coloring according to Examples 1, 3 and 4 with and without the addition of organic ammonia derivatives initially have about the same color tones, the colorations go without additives of organic bases even in the dark after several weeks of storage, sometimes very considerable and become emptier (e.g. examples i and 4) or less attractive (e.g. example 3). In some cases, the addition of organic ammonia derivatives may occur also a slight shift in hue (e.g. Example 2).

As ammonia derivatives are z. B. called ß-aminoethyl alcohol, triethanolamine, Benzylamine, guanidine.

The process offers the possibility of producing very lightfast lacquer coatings on paper, wood, metal, etc. even using the simplest azo dyes that are otherwise quite lightfast in resin lacquers. EXAMPLE 100 parts of commercial spirit varnish are stirred well with 3.5 to 4 parts of β-aminoethyl alcohol at room temperature, whereupon 0.25 part of 2-aminoimethylbenzolazo-2-aminenaphthalene is dissolved in the varnish at water bath temperature. In this way, an orange-colored varnish with good lightfastness is obtained.

If the dye mentioned above is replaced by 4-nitro-2-oxethoxy-i-aminobenzolazo-2-aminonaphthalene, in this way a lightfast blue-red lacquer is obtained.

EXAMPLE 100 parts of spirit varnish are mixed with 3 parts of benzylamine. Dissolve 0.25 part of i-methylamino-4-p-tolylaminoanthraquinone in the mixture at water bath temperature. so you get a good lightfast @ blue paint.

Example 3 100 parts of commercially available linseed oil copolack are mixed with 2 parts Triethanolamine stirred well at room temperature. In the resulting weakly alkaline reacting paint are heated to 6o to 70 ° o; 25 parts of i - methylamino-4-p - tolylaminoanthraquinone dissolved. The clear blue paint obtained has an essential better lightfastness than the corresponding lacquer without triethanolamine.

Example 4 100 parts of commercial wood oil copol or wood oil ester varnish are with 0.8 to i part ß-aminoethyl alcohol and 0.25 parts of anilinazo-2-aminonaphthalene stirred at 6o to 70 °. The lightfastness of the yellow-orange paint obtained is significantly better than that of a wood oil copal varnish or wood oil ester varnish of the same color without the use of ß-aminoethyl alcohol.

For example 100 parts of a wood oil copal lacquer are colored with 0.25 part of i-oxy-4-dioxäthylaminoanthraquinone at 60 ° and then 2 parts of oxethylbenzylamine are added while stirring. The result is a clear, red-violet varnish which is considerably more lightfast than the corresponding varnish without the addition of oxethylbenzylamine.

Claims (1)

PATENT CLAIM: Process to color resin solutions lightfast, thereby characterized that they are before, during or after dyeing with containing basic groups Azo or anthraquinone dyes which do not contain any sulfo or carboxyl group and, insofar as they are anthraquinone dyes, the rest of the anthraquinone only once contained in the molecule, treated with organic derivatives of ammonia.