3,3',4,4'-Benzophenonetetracarboxylic dianhydride (BTDA) CAS 2421-28-5

Name: 3,3',4,4'-Benzophenonetetracarboxylic dianhydride (BTDA) CAS 2421-28-5
Brand: Aure Chemical
Price: 1.00 USD
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Synonyms: Benzophenone-3,3',4,4'-tetracarboxylic dianhydride; 4,4'-Carbonyldiphthalic anhydride; 5,5'-Carbonylbis(isobenzofuran-1,3-dione); Benzophenonetetracarboxylic dianhydride; 4,4'-Diphthalic anhydride ketone

Shandong Aure Chemical Co., Ltd. is one of the leading suppliers of BTDA in China and also one of the manufacturers of this product.

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Product Details

Aure Chemical Delivers Excellence in BTDA

3,3′,4,4′-Benzophenone Tetracarboxylic Dianhydride (BTDA, CAS 2421-28-5) is an aromatic dianhydride primarily used as a monomer for synthesizing polyimides and as a curing agent for epoxy resins, offering high thermal stability, mechanical strength, flexibility, solubility, and processability due to its keto and carbonyl groups.

Basic Information of BTDA

Product Name	3,3',4,4'-Benzophenonetetracarboxylic dianhydride
Abbreviation	BTDA
CAS Number	2421-28-5
Molecular Formula	C17H6O7
Molecular Weight	322.23 g/mol
Appearance	Off-white to brown needles or crystalline powder
Purity	≥98%
Package	1kg/bottle, 20kg/drum, or customized
Molecular formula

Key Properties

High thermal stability and rigidity derived from aromatic benzophenone dianhydride backbone
Keto (carbonyl) groups increase intermolecular spacing, improving solubility and processability of polyimide precursors
Excellent mechanical strength and dimensional stability in cured polyimide systems
Broad compatibility with various aromatic and aliphatic diamines for tailored electronic-grade polyimides
Balanced dielectric and structural performance suitable for electronic and high-temperature insulation materials

Key Applications of BTDA

Electronics and Microelectronics (Primary Application): Widely used in electronic-grade polyimide films for electrical insulation, flexible copper-clad laminates (FCCL), wire enamels and varnishes for motors, dielectric layers in memory devices and organic electronics.BTDA-based polyimides are widely applied in electronic and microelectronic systemsdue to their balanced thermal, mechanical, and dielectric performance.

Aerospace and High-Temperature Insulation (Secondary Application): Applied in polyimide foams for thermal and acoustic insulation, matrix resins for fiber-reinforced composites, and molding materials for aerospace and military components exposed to extreme environments.Learn how BTDA supports high-temperature aerospace polyimide insulation systems.

Functional and Research-Oriented Polyimide Systems: Explored in energy-related and photocatalytic applications, including photosensitizers and functional membranes, where BTDA-based polyimides serve as stable structural platforms for advanced material research.

Packaging, Logistics & Compliance Capabilities

Aure Chemical provides flexible packaging solutions, compliant logistics arrangements, and controlled storage practices to support laboratory-scale, pilot-scale, and commercial-scale global supply.