Description

1,3-Benzenedicarboxylic Acid, 5,5'-Thiobis- is a specialized organic compound featuring a central thioether linkage connecting two isophthalic acid moieties, making it a valuable bifunctional building block. This structure is critical for synthesizing high-performance polymers, including polyamides, polyesters, and polyurethanes, where it imparts enhanced thermal stability and specific chemical resistance. It is primarily sought by R&D chemists and process engineers in the advanced materials, specialty polymer, and pharmaceutical intermediate sectors.

Application

• Polymer Synthesis: A key monomer for producing high-temperature resistant polyamides (nylons) and polyesters.
• Pharmaceutical Intermediates: Serves as a precursor in the synthesis of active pharmaceutical ingredients (APIs) and complex drug molecules.
• Liquid Crystal Polymers (LCPs): Used as a comonomer to manufacture LCPs for electronics and high-performance plastics.
• Crosslinking Agent: Functions as a crosslinker in epoxy resins and other thermosetting polymers to improve mechanical properties.
• Metal-Organic Frameworks (MOFs): Acts as an organic linker in the construction of novel MOFs for catalysis and gas storage.
• Specialty Coatings: Incorporated into coatings formulations to enhance chemical and abrasion resistance.

Basic Information

Product Name	1,3-Benzenedicarboxylic Acid, 5,5'-Thiobis-
CAS No.	1989628-39-8
Molecular Formula	C16H10O8S
Molecular Weight	362.31 g/mol
Synonyms	5,5'-Thiobis(1,3-benzenedicarboxylic acid); Bis(3,5-dicarboxyphenyl) sulfide; 3,3'-Thiodiisophthalic acid; 5,5'-Sulfanediylbis(isophthalic acid); TDIPA; Thiobis(isophthalic acid); [1,1'-Sulfanediylbis(3,5-phenylene)]diacetic acid (deprecated form); Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our 1,3-Benzenedicarboxylic Acid, 5,5'-Thiobis- is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, identity, and impurity profiles are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong acids and organic solvents. The product may be moisture-sensitive; keep the container tightly sealed when not in use.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 10 ppm

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