Description

5-Sulfoisophthalic Acid is a key sulfonated aromatic dicarboxylic acid monomer, essential for introducing permanent anionic character and water solubility into polymeric structures. This compound matters for its role in enhancing the performance and functionality of advanced materials, particularly in applications requiring ionic conductivity or dye receptivity. Industries such as specialty polymers, water treatment chemicals, and advanced material synthesis rely on this high-purity intermediate for product development and manufacturing.

Application

• Polymer Modification: As a co-monomer for synthesizing sulfonated polyesters, polyamides, and polyimides to impart hydrophilicity and ionic character.
• Dye Receptive Polymers: Key component in the production of cationic dyeable polyester fibers and films for the textile industry.
• Water Treatment Chemicals: Building block for ion-exchange resins and membranes used in desalination and purification processes.
• Photographic Chemicals: Used in the synthesis of certain photographic couplers and additives.
• Surfactant Intermediate: Serves as a precursor for specialized anionic surfactants and dispersants.
• Adhesive & Coating Formulations: Incorporated to improve adhesion and water-based properties in coating systems.
• Pharmaceutical Intermediates: Potential building block for certain sulfonated drug molecules and diagnostic agents.

Basic Information

Product Name	5-Sulfoisophthalic Acid
CAS No.	22326-31-4
Molecular Formula	C8H6O7S
Molecular Weight	246.19 g/mol
Synonyms	5-Sulfoisophthalic Acid; 5-Sulfo-1,3-benzenedicarboxylic Acid; 5-Sulfobenzene-1,3-dicarboxylic Acid; Isophthalic Acid-5-sulfonic Acid; 5-Carboxy-2-sulfobenzoic Acid; SIP Acid; 5-SIPA; 5-Sulfoisophthalic Acid Monosodium Salt (common salt form)
EINECS	244-933-5

Quality Control

Our 5-Sulfoisophthalic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, sulfonation degree, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, sulfonic acid content, and levels of related substances. Our quality commitment supports applications requiring high consistency and performance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Sulfonic Acid Content (Titration)	≥ 99.0% on dried basis
Loss on Drying	≤ 2.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.