Description

Sodium Dimethyl 5-Sulphonatoisophthalate is a key sulfonated aromatic intermediate with excellent water solubility and ionic character. This compound matters for its role in modifying polymer properties, particularly in enhancing hydrophilicity and dye receptivity. Industries that need it include specialty polymer manufacturing, textile chemical production, and advanced material synthesis for creating functionalized polyesters and coatings.

Application

• As a sulphonated monomer for the production of water-soluble or hydrophilic polyesters and co-polymers.
• In the manufacture of cationic dyeable polyester (CDP) fibers, where it introduces sulfonate groups for ionic dye sites.
• As a key intermediate in the synthesis of specialty surfactants and dispersants for industrial applications.
• For the modification of polymer electrolytes and ion-exchange membranes in energy storage devices.
• In the production of high-performance inks and coatings requiring enhanced adhesion and wetting properties.
• As a chemical building block in organic synthesis for pharmaceuticals and agrochemicals.

Basic Information

Product Name	Sodium Dimethyl 5-Sulphonatoisophthalate
CAS No.	3965-55-7
Molecular Formula	C10H9NaO7S
Molecular Weight	296.22 g/mol
Synonyms	Dimethyl 5-Sulfoisophthalate Sodium Salt; 5-Sulfoisophthalic Acid Dimethyl Ester Sodium Salt; Sodium 5-Sulfoisophthalic Acid Dimethyl Ester; 1,3-Benzenedicarboxylic Acid, 5-Sulfo-, 1,3-Dimethyl Ester, Sodium Salt; SIP (Sulfoisophthalate) Monomer; SDMSIP; DMSSI; CAS 3965-55-7
EINECS	223-562-7

Quality Control

Our Sodium Dimethyl 5-Sulphonatoisophthalate is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity and performance, meeting the specifications required for polymer-grade intermediates. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can lead to caking or hydrolysis.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Sodium Content	7.5 - 8.0%
Sulfonate Content	31.0 - 33.0%
Melting Point	285 - 295 °C (dec.)
Heavy Metals (as Pb)	≤ 10 ppm

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