Homophthalic anhydride, CAS No. 703-59-3

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703-59-3

Catalog No. EBD10306

CAS 703-59-3

Name Homophthalic anhydride

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Basic Information

Synonyms: 1,3-Isochromandione benzoglutaricanhydride 1H-isochromene-1,3(4H)-dione o-Carboxyphenylaceticacidcyclicanhydride~1,3-Isochromanedione Homophthalicanhydride

Molecular Formula: C9H6O3

Molecular Weight: 162.14

MDL Number: MFCD00006894

Categories: Materials Chemistry > Polymers and Macromolecular Materials > Polyamide and Nylon Precursors Materials Chemistry > Optoelectronic and Organic Semiconductor Materials > Dye Precursors

Product Description:

Pyromellitic dianhydride (PMDA, CAS 703-59-3) is an organic compound with the molecular formula C₁₀H₂O₆. It is a white to off-white crystalline powder, characterized by the presence of two anhydride functional groups on a benzene ring. It is a key monomer in polymer synthesis. Its primary and most significant industrial application is as a co-monomer with aromatic diamines (e.g., oxydianiline) for the production of high-performance polyimide resins and films, such as Kapton®. These materials are renowned for their exceptional thermal stability, chemical resistance, and excellent mechanical and electrical properties, finding extensive use in the aerospace, electronics (flexible circuits, wire insulation), and automotive industries. PMDA is also used in the synthesis of certain dyes and pigments. PMDA is moisture-sensitive and hydrolyzes to pyromellitic acid upon exposure to water. It is an irritant to the skin, eyes, and respiratory system, requiring careful handling under appropriate conditions to avoid inhalation or contact.

Physical Properties

Melting Point: 140-142 °C(lit.)

Boiling Point: 324.5 °C at 760 mmHg

Flash Point: 159 °C

Density: 1.347 g/cm3

Storage: 2-8°C

Analytical Data

Appearance: slightly yellow to beige or light green powder