5-(Sodiosulfo) Isophthalic Acid (5-SSIPA)
5-(Sodium Sulfo) Isophthalic Acid (abbreviated as 5-SSIPA) is a highly reactive sulfonate-type aromatic dicarboxylic acid. It appears as a white to off-white crystalline powder. Its molecular structure simultaneously contains a dicarboxylic acid group (-COOH) and a hydrophilic sodium sulfonate group (-SO3Na). It exhibits outstanding reactivity, water solubility, and chemical stability, serving as a key functional monomer in polymer synthesis and fine chemical industries. It plays an irreplaceable role particularly in polyester modification and the development of water-based functional materials.
Sulfonated aromatic dicarboxylic acid for polymer and fine chemical applications
5-SSIPA is a white to off-white crystalline powder. Its molecular structure contains both dicarboxylic acid groups (-COOH) and a hydrophilic sodium sulfonate group (-SO3Na), giving outstanding reactivity, water solubility and chemical stability. It is used as a key functional monomer in polymer synthesis and fine chemical industries, especially in polyester modification and water-based functional materials.
High Reactivity
Contains both dicarboxylic acid groups and a hydrophilic sodium sulfonate group, supporting high reactivity and chemical stability.
Water Solubility
Soluble in water, making it suitable for water-based functional material development.
Polyester Modification
Used in Dacron polyester production and other polyester modification routes.
Fine Chemical Intermediate
Acts as an intermediate or modifier for pharmaceutical, pesticide and fine chemical applications.
Key test data
Technical specifications for 5-SSIPA, organized for quick technical review.
| Item | Premium grade | First grade product | Qualified proudct |
|---|---|---|---|
| 20% water solution | No suspended matter, no sediment clear liquid | – | – |
| Chromaticity，（20% water solution，platinum—cobalt ）number ≦ | 20 | 20 | 20 |
| 40%EGChromaticity，（platinum—cobalt ）number ≦ | 50 | 60 | 100 |
| Absorbance ≤ | 0.40 | – | – |
| Acid value，mgKOH/g | 415～421 | 415～421 | 415–421 |
| Content，% ≧ | 99.0 | 99.0 | 99.0 |
| Sulfate（Counted by SO4）Content，mg/kg ≦ | 500 | 500 | 500 |
| Ferrum（Fe）Content，mg/kg ≦ | 5 | 8 | 10 |
| Chloride（Counted by C1）Content，mg/kg ≦ | 10 | 15 | 20 |
| Moisture，% ≦ | 0.50 | 0.50 | 1.0 |
| pH value | 1.8～2.2 | – | – |
Applications
Primary application routes for 5-SSIPA.
Polyester Modification
For Dacron polyester production and polyester chain modification.
Functional Monomer
For polymer synthesis requiring sulfonated aromatic acid functionality.
Pharmaceutical and Pesticide Intermediates
Used as an intermediate or modifier in relevant production routes.
Water-Based Functional Materials
Supports development of water-soluble or water-dispersible systems.
Fine Chemical Applications
For specialty chemical production where reactivity and purity matter.
Protected from factory to customer
5-SSIPA should be stored in a dry, ventilated warehouse and protected from moisture, direct sunlight and fire. It should be kept separate from incompatible chemical products. Standard packaging includes polypropylene woven bags or paper bags, with 25 kg, 500 kg or customer-specified net weight options.
Package of 5-SSIPA and SIPM
5-SSIPA MSDS
Download the MSDS for 5-SSIPA. Contact XUYE for current technical data or application support.