Description

4,4'-Sulfonylbis(Phthalic Acid) is a high-purity aromatic sulfone dicarboxylic acid derivative, serving as a critical building block in advanced polymer synthesis. Its unique molecular structure, featuring two phthalic acid groups linked by a sulfone bridge, enables the production of high-performance materials with exceptional thermal stability and mechanical properties. This compound is essential for manufacturers in the specialty polymer, advanced resin, and high-temperature material sectors seeking to enhance product performance.

Application

• Polyimide Monomer: A key precursor for synthesizing high-performance polyimide resins and films used in aerospace, electronics, and flexible circuitry.
• Polyether Sulfone (PES) / Polysulfone (PSU) Modification: Used as a comonomer to introduce carboxylic acid functionality, modifying thermal and solubility properties of engineering thermoplastics.
• High-Temperature Adhesives and Coatings: Incorporated into formulations for coatings and adhesives that require sustained performance in extreme thermal environments.
• Liquid Crystal Polymer (LCP) Synthesis: Acts as a monomeric unit in the production of aromatic LCPs for precision molded components.
• Crosslinking Agent: Serves as a crosslinker in epoxy and other thermoset resin systems to improve heat resistance and structural integrity.
• Pharmaceutical Intermediate: Utilized in the synthesis of complex organic molecules and active pharmaceutical ingredients (APIs) with sulfone linkages.

Basic Information

Product Name	4,4'-Sulfonylbis(Phthalic Acid)
CAS No.	10595-31-0
Molecular Formula	C16H10O10S
Molecular Weight	394.31 g/mol
Synonyms	4,4'-Sulfonyldiphthalic Acid; Bis(3,4-dicarboxyphenyl) Sulfone; 4,4'-(Sulfonylbis(1,2-phenylene))bis(1,3-dioxoisobenzofuran-5-carboxylic acid) (cyclic form); 4,4'-Sulfonylbis(benzene-1,2-dicarboxylic acid); 4,4'-Sulfonyldibenzoic Acid Tetracarboxylic Derivative; SDPA; Sulfonyldiphthalic Anhydride (dehydration product)
EINECS	Contact for details

Quality Control

Our 4,4'-Sulfonylbis(Phthalic Acid) is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay by HPLC, identification by FT-IR, and impurity profiling, to ensure it meets exacting specifications for polymer-grade applications. A Certificate of Analysis (COA) documenting purity, identity, and key physical parameters is 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, and well-ventilated area at room temperature (15-25°C). The product is moisture-sensitive (hygroscopic); keep the original container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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