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
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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

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Product Details

BTDA CAS 2421-28-5 for Polyimide Synthesis

3,3',4,4'-Benzophenonetetracarboxylic dianhydride, commonly known as BTDA, is abenzophenone-type aromatic dianhydride monomer used as a structural building block in high-performance polyimide synthesis. Its aromatic dianhydride structure and benzophenone carbonyl group make BTDA relevant to polyimide systems where thermal resistance, mechanical strength, dimensional stability and processability need to be balanced.

BTDA belongs to the broader category ofpolyimide dianhydride monomersand is also included in Aure Chemical’sPolyimide Monomers: Diamines and Dianhydridestechnical guide. It is often considered in heat-resistant polyimide resins, coatings, insulation materials, electronic-grade PI systems and specialty polymer applications.

Basic Information of BTDA

Product Name	3,3',4,4'-Benzophenonetetracarboxylic dianhydride
Abbreviation	BTDA
CAS Number	2421-28-5
Product Type	Benzophenone-type aromatic dianhydride monomer
Molecular Formula	C17H6O7
Molecular Weight	322.23 g/mol
Appearance	Off-white to white powder
Purity	≥ 98%
Melting Point	≥ 224°C; available batch result 224.1–226.7°C
Metal Testing	Single metal ≤ 1 ppm; available batch result approved
Main Application	Heat-resistant, electronic-grade and specialty polyimide synthesis
Package	1 kg/bottle, 20 kg/drum, or customized packaging
Documents	COA, SDS and TDS available upon request
Molecular Structure

Typical Specification of BTDA

Item	Standard	Available Batch Result
Appearance	Off-white to white powder	Off-white powder
Purity (HPLC)	≥ 99%	99.84%
Melting Point	≥ 224°C	224.1–226.7°C
Metal Testing	Single metal ≤ 1 ppm	Approved
BTA	≤ 1.2%	0.2%
Storage Conditions	Sealed container; keep dry; store in a cool and dark place	Based on available COA reference

The above data is based on an available batch COA for BTDA CAS 2421-28-5. Final specifications, batch data and documentation should be confirmed by the latest COA before order confirmation.

Key Features in Polyimide Design

Benzophenone-type aromatic dianhydride structure, relevant to polyimide dianhydride monomers used in heat-resistant PI systems.
Rigid aromatic backbone may support thermal stability, mechanical strength and dimensional control depending on the paired diamine and formulation.
Benzophenone carbonyl structure can influence molecular packing and processability in selected polyimide systems.
BTDA-based PI systems are commonly discussed in electronics and microelectronics polyimide applications where insulation, thermal endurance and mechanical properties are important.
The final material properties depend on dianhydride purity, diamine selection, solvent system, imidization conditions and polymer processing method.

Pairing BTDA with Diamine Monomers

In polyimide synthesis, BTDA may be evaluated with selected polyimide diamine monomers supply portfolio to design thermally stable, mechanically robust and specialty polyimide systems. Rigid aromatic diamines may support heat resistance and dimensional stability, while ether-containing diamines may help improve processability and film-forming behavior.

Fluorinated diamines such as TFMB / TFDB CAS 341-58-2 can be considered when the formulation requires additional control of dielectric behavior or optical properties, while ether-containing diamines such as BAPP CAS 13080-86-9 may support processability and flexibility in selected PI systems.

Application Context of BTDA in Polyimide Systems

BTDA is typically used as a structural dianhydride monomer rather than a finished application material. It is commonly considered in heat-resistant, electronic-grade and specialty polyimide material development, where thermal stability, mechanical strength and processability are important design factors.

Electronics and microelectronics polyimide applications – insulation, dielectric and thermally stable polymer material design.
High-temperature aerospace polyimide insulation systems – heat-resistant insulation and structural polymer environments.
Specialty functional polyimide development – aromatic dianhydride selection for advanced polymer research.
Heat-resistant films, varnishes and coatings – BTDA-based polyimides may be considered where thermal endurance and mechanical integrity need to be balanced.

COA, SDS and Technical Documentation

Aure Chemical can provide COA, SDS, TDS, typical specifications and packaging information for BTDA CAS 2421-28-5 upon request. Available batch COA shows 99.84% purity by HPLC, melting point of 224.1–226.7°C, approved single-metal testing under the listed standard, and BTA result of 0.2%.

Please share the required purity, target specification, quantity, destination country or port, preferred packaging method and required documents so we can review availability, documentation support and export packing options.

Contact Aure Chemical for BTDA documentation and quotation support.

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.