Description

4,4'-Thiodiphthalic Anhydride is a high-purity, specialized aromatic dianhydride monomer. This compound matters as a critical building block for the synthesis of advanced polyimides and other high-performance polymers, offering enhanced thermal stability and unique material properties. It is essential for manufacturers and R&D teams in the electronics, aerospace, and specialty plastics industries seeking to develop next-generation materials with superior heat resistance and mechanical strength.

Application

• Primary monomer for the synthesis of high-temperature polyimides and polyamide-imides.
• Key intermediate in the production of advanced engineering plastics for aerospace and automotive components.
• Used in the formulation of heat-resistant coatings and insulating enamels for electrical wires.
• Building block for liquid crystal polymers (LCPs) used in electronics and precision molded parts.
• Research and development of novel photosensitive polyimides for microelectronics and semiconductor applications.
• Production of gas separation membranes and other specialty polymeric films.
• Cross-linking agent for epoxy resins to improve thermal and chemical resistance.
• Synthesis of pharmaceutical intermediates and other fine chemicals.

Basic Information

Product Name	4,4'-Thiodiphthalic Anhydride
CAS No.	25884-43-9
Molecular Formula	C16H6O6S
Molecular Weight	326.28 g/mol
Synonyms	4,4'-Thiobisphthalic Anhydride; 4,4'-Sulfonyldiphthalic Anhydride; 4,4'-(Thiodi-1,4-phenylene)diphthalic Anhydride; 4,4'-Thiodiphthalic Acid Dianhydride; TDPA; Bis(3,4-dicarboxyphenyl) Sulfone Dianhydride; 4,4'-Sulfonyldibenzoic Acid Dianhydride; 4,4'-Thiodibenzophenone-3,3',4,4'-tetracarboxylic Dianhydride
EINECS	Contact for details

Quality Control

Our 4,4'-Thiodiphthalic Anhydride is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for high-performance polymer synthesis. Certificates of Analysis (COA) documenting all critical parameters are provided to guarantee batch-to-batch consistency and traceability.

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 nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product quality. Keep away from incompatible materials such as strong bases and amines.

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	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
Residue on Ignition	≤ 0.1%

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