5-Amino-2-[(4-Aminophenyl)Amino]Benzenesulfonic Acid (CAS 119-70-0): Technical Guide
Table of Contents
1. Product Overview & Specifications
| Parameter | Value |
|---|---|
| CAS Number | 119-70-0 |
| Molecular Formula | C12H13N3O3S |
| Molecular Weight | 279.315 g/mol |
| Appearance | Solid crystalline powder |
| Melting Point | 244°C |
| Density | 1.527 g/cm³ |
| Refractive Index | 1.726 |
2. Key Applications
This compound serves as a critical dye intermediate in the chemical industry, particularly for synthesizing:
- Black Base B: A naphthol AS-based ice colorant for high-fastness textile dyeing.
- Black Salt ANS: Used in oxidation dye formulations for leather and specialty coatings.
Its sulfonic acid group and aromatic amine structure enable covalent bonding with substrates, ensuring excellent color stability under UV exposure and washing.
3. Industrial Use Cases
Textile Manufacturing
Enables production of deep-black shades on cotton/polyester blends with ≤5% color loss after 50 industrial wash cycles.
Leather Processing
Used in aniline leather dyeing to achieve uniform penetration and oxidation-resistant finishes.
4. Client Success Stories
Case Study 1: Textile Dye Producer (Hangzhou, China)
Achieved 20% reduction in dye aggregation during high-temperature processing by optimizing reaction stoichiometry with CAS 119-70-0.
Case Study 2: Specialty Chemicals Supplier (Mumbai, India)
Developed eco-friendly leather dyes meeting EU REACH standards through controlled diazotization using this intermediate.
5. Contact for Custom Solutions
Request technical datasheets, bulk pricing, or formulation support:
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