Description

Dimethyl 5-Sulphoisophthalate is a high-purity, sulfonated aromatic diester widely used as a key monomer and intermediate in advanced polymer synthesis. This compound is valued for introducing sulfonate groups into polymer backbones, significantly enhancing properties such as hydrophilicity, ion-exchange capacity, and dye affinity. It is essential for manufacturers in the specialty polymer, textile, and water treatment industries seeking to develop high-performance materials like sulfonated polyesters and polyamides.

Application

• Monomer for Sulfonated Polyesters: A critical building block for synthesizing water-dispersible and cationic dyeable polyesters used in textile fibers and films.
• Polymer Modification Agent: Imparts permanent anionic character and improved hydrophilicity to engineering plastics and coatings.
• Ion-Exchange Resin Precursor: Used in the manufacture of specialty resins for water purification and selective ion removal processes.
• Dye Intermediate: Serves as a sulfonation agent and intermediate in the production of certain acid and reactive dyes.
• Pharmaceutical Intermediate: Employed in the synthesis of certain pharmacologically active molecules requiring a sulfonated aromatic moiety.
• Research & Development: Utilized in academic and industrial R&D for developing novel functional polymers and materials.

Basic Information

Product Name	Dimethyl 5-Sulphoisophthalate
CAS No.	138-25-0
Molecular Formula	C10H10O7S
Molecular Weight	274.25 g/mol
Synonyms	Dimethyl 5-sulfoisophthalate sodium salt (common commercial form); 5-Sulfoisophthalic acid dimethyl ester; Dimethyl 5-sulfobenzene-1,3-dicarboxylate; Sodium 5-(methoxycarbonyl)isophthalate-3-sulfonate; 1,3-Benzenedicarboxylic acid, 5-sulfo-, 1,3-dimethyl ester; Monosodium 3,5-dicarbomethoxybenzenesulfonate; DMSP
EINECS	205-317-5

Quality Control

Our Dimethyl 5-Sulphoisophthalate is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for polymer-grade applications. Certificates of Analysis (COA) documenting purity, assay, and impurity profiles are provided with every shipment to guarantee traceability and consistency for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). The product is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.5%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Sulfonate Content	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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