DE3136809A1 - OPTICAL BRIGHTNING PREPARATIONS - Google Patents

Description

BAYER AKTIENGESELLSCHAFT 5090 Leverkusen, Bayerwerk

Central area

Patents, trademarks and licenses K / Kü-c

Sep 15

Optical brightener preparations

The invention relates to brightener preparations which contain a cationic optical brightener, an anionic surfactant and, if appropriate, further additives. The preparations may be in solid or liquid form c.

Such brightener preparations are obtained, for example, by using at least one cationic optical brightener, at least one anionic surfactant and optionally further additives in an aqueous medium mixed together and optionally dried.

Cationic optical brighteners which can be used according to the invention are described in large numbers in the literature, preparations containing general brighteners are preferred formula

/ XY- Ζ? ® Αη ^θ

contain, in which

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a O ο

-3-

Y
Z

An =

TriaζοIy1-Eest Coumarinyl or benzofuranyl radical on the N atom quaternized heteroaromatic radical Anion

5 means.

Within this group, those are preferred by those

X =

(R ₁ , R ₂ = H, alkyl, aryl)

Y =

Z = triazolyl radical with a quaternary nitrogen atom, for example

—Ν

—Ν - alkyl

as well as those with them

X has the above meaning

Anion

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Λ-

γ =

Z = ImidazoIyIrest with quaternary nitrogen atom, inert

Alkyl

Anion

Particularly preferred brighteners are those in the following References described in DE-OS 2 821 116, DE-OS 2 040 189 and DE-OS 1 670 999.

Examples of anionic surfactants include:

Sulfated alkylene oxide adducts, sulfated partially esterified polyhydric alcohols, alkylsulfonates sodium dialkyl sulfosuccinates, alkylbenzene sulfonates, condensation products of naphthalenesulfonic acids or ditolyl ether sulphonic acids with formaldehyde, lignosulphonates and _f Oxyligninsulfonate, or condensation products of cresol ^ -Napthol-ö-sulfonic acid, formaldehyde and sulfuric acid. Surfactants with dispersant properties, such as the abovementioned lignin derivatives and formaldehyde condensation products, are preferred.

The anionic surfactants can be in the form of the free acid or used in the form of their water-soluble salts.

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.5.

Other customary additives are, for example: inorganic salts, such as NaCl, Na ₃ SO ₄ ; Salts of organic acids, for example CH ₃ COONa, or highly water-soluble organic compounds, such as ζ.B. £ -caprolactam, sugar, etc.

The concentration of the cationic optical brightener in the preferably liquid aqueous preparation is in the range from 1 to 10%, that of the anionic surfactants from 3 - 40% and that of the other additives also from 3 to 40

The production of the brightener preparations according to the invention takes place in that the cationic optical Auf Lighter together with the anionic surfactants and optionally the other additives in an aqueous medium and homogenized if necessary brought into solution with heating.

If necessary, the solution can be filtered in order to remove undissolved constituents or impurities. The homogenization takes place according to known methods with e.g. high-speed stirrers, rotor-stator mills, dissolvers or similar devices.

If a solid preparation is desired, the liquid preparations can be prepared using known drying methods to be dried.

The brightener preparations according to the invention are suitable excellent for the production of dye liquors for whitening polyacrylonitrile fibers using the exhaust process, preferably with a bleaching of the fiber material carried out in the same bath, for example with sodium chloride.

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example 1

3.6 g of the optical brightener of the formula

CH-

CH ₃ OSO ₃

in a solution of 40 a condensation product of ditolyl ether, formaldehyde and sulfuric acid g dissolved in 66.5 g of water at 70 ⁰ C under .Rühren. The solution is retained even after cooling to room temperature.

Compared to the low water solubility of the brightener active ingredient of only 0.07%, a 50-fold higher concentration can be achieved with the above-mentioned preparation.

Example 2 .

7 g of the brightener from example 1 are dissolved with 88 g of the anionic surfactant from example 1 and 1 g of CH ₃ COONa in 250 g of water and then spray-dried to a powder with 4% residual moisture.

This preparation results on polyacrylonitrile fibers in the concentration range of 0.2-2% and in liquor ratios Applied from 1:10 to 1:40, brilliant green-tinged lightening.

2r. Example 3

6 g of the optical brightener of the formula

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CH ₃ OSO ₃

are homogenized together with 88 g of the anionic surfactant from Example 1 and 1 g of CH ₃ COONa in 250 g of water with stirring and spray-dried to a powder with 5% residual moisture.

30 g of this powder are dissolved in 70 g of boiling water of pH 4 (acetic acid). This solution persists even after obtained after cooling to room temperature.

Compared to the low water solubility of the brightener active ingredient of only 0.029% in water, a 60-fold higher concentration can be achieved with this preparation will.

The above-mentioned preparation results in polyacrylonitrile fibers im Concentration range from 0.2-2% and used in liquor ratios from 1:10 to 1:40, brilliant bluish tint Colorations.

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Claims (2)

Patent to sayings 1. Brightener preparations, consisting of a cationic optical brightener, an anionic one Surfactant and possibly other customary additives. 2. brightener preparations according to claim 1, characterized characterized in that they are used as a surfactant lignin, oxylignin sulfonate or Condensation products of naphthalene sulfonic acids or ditolyl ether sulfonic acids with formaldehyde contain. Le A 21 308