Chicago Acid (8-Aminonaphthalene-1,3,6-Trisulfonic Acid)
CAS Number: 86-65-7
Chicago Acid is a trisulfonated naphthalamine intermediate with three sulfonic acid groups that impart exceptional water solubility and fiber affinity to the dyes derived from it. It is primarily used in the synthesis of highly water-soluble direct dyes for cotton and viscose printing with excellent leveling properties. Chemzip supplies Chicago Acid to direct dye and reactive dye manufacturers seeking superior solubility performance.
Technical Specifications
| appearance | Brown crystalline powder |
| purity (%) | ≥88.0 |
| moisture (%) | ≤5.0 |
| sulfonate groups (meq/g) | ≥6.5 |
Applications
- Highly water-soluble direct dye synthesis for cotton printing
- Reactive dye intermediate for navy and black shades
- Viscose fiber dyeing dye components
- Textile auxiliary and optical brightening agent synthesis
- Acid dye for deep-shade wool dyeing
Key Features
- Three sulfonic groups give best-in-class solubility among naphthalene coupling components
- Consistent high-sulfonate content for reliable dye bath preparation
- Well-suited for continuous pad-steam dyeing processes
- Moisture-controlled packaging maintains free-flowing powder form
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CAS Number
86-65-7
Category
Dye / Pigment IntermediatesAvailability
In StockSample
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