Acid dye dispersions

Details Acid dye dispersions Acid dye dispersions

C - Chemistry, Metallurgy

09

B

8/50

C09B 67/40 (2006.01) C09B 67/26 (2006.01)

Patent

CA 1221204

ACID DYE DISPERSIONS ABSTRACT OF THE DISCLOSURE 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.

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