Mobay Chemical Corporation

Mobay Corporation

Bayer Aktiengesellschaft

Thomas J Thomas

Charles W Sandefur

Dietmar Kalz

Robert G Hoguet

Susan M Morris

Joachim Wolff

Konrad Nonn

Karl-Heinz Wolf

Margaret D Ellis

Henry T Whetsell

Donald F Lindow

Robert G Hoquet

There is disclosed a procedure for reducing the halide content of cationic or basic dyes and consequently the corrosive effect of aqueous formulations of these dyes on stainless steel. The dyes are incorporated into aqueous formulation which may range from neutral to acidic and exposed to an anionic exchange resin. Suitable techniques include stirring beads of the resin into the aqueous formulation and passing the aqueous formulation through an ion exchange column.

Removal of excess halide ions in aqueous liquid formulations of basic

The present invention is concerned with improving the solubility of anionic water soluble dyestuff powders. The solubility of these powders particularly in cold water, is enhanced by adding (i) a chelating agent which has at least two free acid groups and (ii) a Lewis base in an amount sufficient to bring the pH of the water solution of the powder to a value of about 7-10.

Dry dyestuff powders with enhanced water solubility

The present disclosure is concerned with enhancing the solubility of dispersed anionic dyes upon the dilution of their dispersions with room temperature water. Concentrated dispersions of such dyes with acceptable stability and low shear viscosities are disclosed which are more readily diluted to dissolve the dispersed dyestuff because they contain certain chelating agents are described. These agents have at least one free or appropriately neutralized acid group, with carboxylic acid groups being preferred. The appropriae cations include ammonium or lithium ions. The free acid groups are subsequently neutralized with these appropriae cations so that the final dispersions are preferably about neutral, i.e have pH values about 7. A further improvement to the dilutability by the addition of a surfactant, preferably a non-ionic surfactant, is also discssed. The preferred dispersions dilute to a solution free of particles visible to the unaided human eye within three minutes of being combined at a rate of three grams of dispersion per liter of room temperature water.

Anionic dye dispersions with enhanced cold water solubility upon dilution

The present invention is concerned with the modification of the sodium salt of a known optical brightener to obtain a white crystalline material. The commercially available 4,4'-bis-(2-anilino-4-phenylamino-1,3,5-triazinyl-6-amino)-stilbene-2,2'-d isulphonic acid is neutralized with a sodium base such as caustic and exposed to temperatures above about 65.degree. C. as an aqueous slurry containing some undissolved disodium salt. The water solubility of this salt may be inhibited by the addition of an electrolyte and the product may be recovered by spray drying.

White modification of a bis-triazinyl amino stilbene optical brightener

The present disclosure is concerned with new modifications of the dyestuff Color Index Acid Blue 324 which have significant advantages over the known form of this dyestuff. In particular, the preferred modification is much easier to isolate from an aqueous medium by filtration and the isolated product has a higher purity. The filtration proceeds much more rapidly and gives a filter residue of a much higher solids content. Furthermore, this new form of the dyestuff imparts a dramatically lower viscosity to aqueous dispersions or slurries prepared from it than are obtained using the old form of this dyestuff. These modifications are obtained by heating an aqueous dispersion or slurry of the known form of Color Index Acid Blue 324 to temperatures in excess of about 97.degree. C. and for the preferred form in the presence of a substance which reduces the surface tension between the dispersed organic dyestuff phase and the aqueous dispersing medium. The obtained dyestuff modifications display Debye-Scherrer X-ray diffraction patterns substantially different from that of the commercially available Color Index Acid Blue 324 evidencing that new crystal forms have been obtained. This is confirmed by optical microscopy which shows that the dyestuff undergoes a transformation from sharp, thin needles to either parallelograms or hexagons.

Modified acid dyestuff

The present disclosure is concerned with aqueous dispersions of anionic acid dyes, especially the monosulphonated level dyeing acid dyes, which have low room temperature, low shear viscosities and good storage stability. This low viscosity enables them to be readily poured, pumped and otherwise handled. These dispersions comprise dyestuff solids with a controlled particle size distribution having a median value between about 1 and 10 microns; an anionic dispersant; and an electrolyte. In a preferred embodiment the pH is adjusted to give an optimum viscosity value. Another preferred feature is the adjustment of the rheology with a thickening agent such as xanthan gum. These dispersions find particular utility in the continuous dyeing of carpet, especially in Kuesters or foam dyeing equipment.

Acid dye dispersions

The present disclosure is concerned with storage stable concentrated fluid aqueous dispersions of water soluble cold dyeing fiber reactive dyes. These dispersions contain anionic or polyvinyl dispersants to provide resistance against settling or agglomeration and water soluble electrolytes to provide resistance against hydrolysis of the fiber reactive groups. The dispersions have an average particle size of less than 100 microns and in a preferred embodiment sufficient buffering agent to stabilize the pH at between about 5 and 8.

Concentrated flowable storage stable aqueous formulations of cold dyeing

The present invention is concerned with modifying the crystal form of the anthraquinone of the formula ##STR1## so as to render it more suitable for disperse dyeing and to improve its performance in thermosol dyeing. The modification is effected by heating the dyestuff at elevated temperatures, preferably between 90.degree. and 185.degree. C. until the Debye-Scherrer strong intensity spacings appear at 6.5A.degree., 18.1A.degree. and 20.6A.degree.. It is also concerned with disperse and thermosol dyeing processes utilizing this crystal modification and with aqueous dispersions of this crystal modification.

Anthraquinone dyestuff modification

This invention relates to the preparation of low foam generating and/or low dusting dyestuff or fluorescent whitening agent formulations by continuous introduction of defoaming and/or dedusting agents into the feed stream carrying the aqueous dyestuff or fluorescent whitening agent preparation to a drying apparatus.

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Summerville, SC, United States of America

Thomas J Thomas