Description

3,3',4,4'-Isophthaloydiphthalic Acid CAS NO 23646-80-2 is a high-purity aromatic tetracarboxylic acid derivative, serving as a critical advanced intermediate for high-performance polymers. Its value lies in its rigid, multi-functional molecular structure, which is essential for synthesizing materials with exceptional thermal stability and mechanical properties. This compound is primarily needed by manufacturers in the polyimide, polyamide, and specialty epoxy resin industries, where it acts as a key monomer for high-temperature adhesives, advanced composite matrices, and electronic packaging materials.

Application

• Primary monomer for the synthesis of high-performance, heat-resistant polyimide resins and films.
• Key building block in the production of polyamide-imides (PAI) for coatings, wires, and structural components.
• Intermediate for specialty epoxy curing agents and hardeners, enhancing thermal and chemical resistance.
• Precursor in the manufacture of liquid crystal polymers (LCPs) for electronics and precision molding.
• Used in R&D for developing advanced composite materials for aerospace and automotive applications.
• Chemical intermediate for dyes and pigments requiring complex aromatic structures.

Basic Information

Item	Details
Product Name	3,3',4,4'-Isophthaloydiphthalic Acid
CAS No.	23646-80-2
Molecular Formula	C24H12O10
Molecular Weight	460.35 g/mol
Synonyms	Isophthaloyl-3,3',4,4'-biphenyltetracarboxylic Acid; 5,5'-(Isophthaloyldiimino)diisophthalic Acid; 3,3',4,4'-Biphenyltetracarboxylic Acid Isophthaloyl Derivative; IPDA; BPDA Isophthaloyl Derivative; 1,1':3',1''-Terphenyl-2',3,3'',5,5'-pentacarboxylic Acid (related structure); Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our production of 3,3',4,4'-Isophthaloydiphthalic Acid adheres to a strict quality management system. Every batch is analyzed to ensure high purity and consistency, with specifications typically covering identity, assay, and critical impurity profiles. Certificates of Analysis (COA) documenting results from HPLC, IR, and titration methods are provided and available upon request to support your quality assurance protocols.

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 (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
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.