Description

5-Sulphoisophthalic Acid, Potassium Salt is a key sulfonated aromatic dicarboxylate salt, widely recognized for its role as a functional monomer and intermediate in advanced polymer synthesis. Its primary value lies in introducing both ionic sulfonate groups and carboxylic acid functionality into polymer backbones, significantly enhancing hydrophilicity, dyeability, and antistatic properties. This compound is essential for manufacturers in the production of specialty polyesters, water-soluble resins, and high-performance coatings, where precise chemical modification is required. The product is supplied with a CAS registry number of 71872-94-1.

Application

• Specialty Polyester & Polyamide Modification: A critical monomer for synthesizing sulfonated copolyesters (e.g., for water-dispersible or cationic dyeable fibers) and polyamides to improve dye uptake and moisture management.
• Water-Soluble Polymer Synthesis: Used in the production of polymers for applications in dispersants, scale inhibitors, and flocculants within water treatment formulations.
• High-Performance Coatings & Inks: Imparts improved adhesion, dispersion stability, and rheological properties in coating resins and inkjet ink formulations.
• Ion-Exchange Resin Precursor: Serves as a building block for resins used in water purification and chromatographic separation processes.
• Pharmaceutical & AgroChemical Intermediates: Utilized in the synthesis of more complex sulfonated molecules for active ingredients or formulation aids.
• Crosslinking Agent & Monomer for Adhesives: Enhances the performance of adhesives and sealants by contributing to ionic crosslinking and improved substrate wetting.

Basic Information

Product Name	5-Sulphoisophthalic Acid, Potassium Salt
CAS No.	71872-94-1
Molecular Formula	C8H5KO7S
Molecular Weight	284.28 g/mol
Synonyms	Potassium 5-Sulfoisophthalate; 5-Sulfoisophthalic Acid Monopotassium Salt; SIP (Potassium Salt); Monopotassium 5-Sulfoisophthalate; 5-Sulfobenzene-1,3-dicarboxylic Acid Potassium Salt; Potassium 3-Carboxy-4-sulfobenzoate; 1,3-Benzenedicarboxylic acid, 5-sulfo-, monopotassium salt
EINECS	Contact for details

Quality Control

Our 5-Sulphoisophthalic Acid, Potassium Salt is manufactured under a stringent quality management system. Each batch undergoes rigorous analytical testing, including assay by titration, impurity profiling via HPLC, and confirmation of identity (IR), to ensure consistency and compliance with agreed specifications. A comprehensive Certificate of Analysis (COA) detailing purity, moisture content, and heavy metal limits is provided with every shipment to guarantee traceability and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after initial use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Water Content (KF)	≤ 2.0 %
Sulfonate Content	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
pH (5% solution)	Contact for details

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