Acid dye dispersions

US4468230A · kind A · utility

Assignee

• Mobay Chemical Corporation · US

Inventors

• Thomas J. Thomas · Summerville, US
• Robert G. Hoguet · Summerville, US
• Charles W. Sandefur · Summerville, US
• Dietmar Kalz · Neunkirchen, DE

Key dates

• Filing date: Mar 25, 1983
• Grant date: Aug 28, 1984
• Expiry date: Mar 25, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/929
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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.