3,3',4,4'-Benzophenonetetracarboxylic dianhydride
[CAS# 2421-28-5]

Identification

• Classification: Organic raw materials >> Carboxylic compounds and derivatives >> Halogenation, sulfonation, nitration or nitration of carboxylic anhydrides
• Name: 3,3',4,4'-Benzophenonetetracarboxylic dianhydride
• Synonyms: Benzophenone-3,3',4,4'-tetracarboxylic dianhydride; 4,4'-Carbonyldiphthalic anhydride; BTDA
• Molecular Formula: C₁₇H₆O₇
• Molecular Weight: 322.23
• CAS Registry Number: 2421-28-5
• EC Number: 219-348-1
• SMILES: C1=CC2=C(C=C1C(=O)C3=CC4=C(C=C3)C(=O)OC4=O)C(=O)OC2=O

Properties

• Density: 1.57 g/mL
• Melting point: 219-226 ºC
• Sublimation: 220-230 ºC
• Flash point: 324 ºC
• Water solubility: REACTS

Safety Data

• Hazard Symbols: GHS07 Warning
• Hazard Statements: H319--H335
• Precautionary Statements: P261-P264+P265-P271-P280-P304+P340-P305+P351+P338-P319-P337+P317-P403+P233-P405-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Specific target organ toxicity - single exposure	STOT SE	3	H335
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Skin sensitization	Skin Sens.	1A	H317
Skin sensitization	Skin Sens.	1	H317

Discovory and Applicatios

3,3',4,4'-Benzophenonetetracarboxylic dianhydride (BTDA) was first synthesized in the mid-20th century as chemists explored novel anhydride compounds for advanced material applications. The chemical formula of BTDA is C17H6O7, featuring a benzophenone core with two anhydride groups attached at the 3,3' and 4,4' positions. This discovery was significant for the development of high-performance polymers, as BTDA's unique structure imparts exceptional thermal stability and chemical resistance.

BTDA is a critical monomer in the synthesis of polyimides, which are known for their excellent thermal stability, mechanical strength, and chemical resistance. Polyimides derived from BTDA are used in applications that require materials to perform under extreme conditions. Industries such as aerospace, electronics, and automotive benefit from these polyimides, which maintain their properties at high temperatures and in chemically harsh environments.

The aerospace industry employs BTDA-based polyimides for their lightweight, durable, and heat-resistant properties. These materials are essential in manufacturing components for aircraft, spacecraft, and satellites, where they help reduce weight while maintaining structural integrity and thermal stability.

In the electronics sector, BTDA-based polyimides are used as insulating films, flexible circuit substrates, and protective coatings. Their superior electrical insulation properties and thermal stability make them ideal for high-performance electronic devices. These polyimides ensure the reliability and longevity of flexible printed circuit boards (PCBs) and various semiconductor components.

The automotive industry utilizes BTDA-derived polyimides for their excellent thermal and chemical resistance. These materials are used in producing gaskets, seals, and insulating components that must withstand high temperatures and exposure to aggressive chemicals within engine compartments.

BTDA also finds applications in various industrial processes that require high-performance materials. This includes coatings for chemical processing equipment, high-strength fibers for industrial textiles, and membranes for gas separation.

References

2024. Highly efficient thermal insulation polyimide foams enhanced by cation-π interactions. *Journal of Materials Science*, 59(44).
DOI: 10.1007/s10853-024-10372-6

2023. Conversion of Waste Thermocol into Effective Adsorbent by Chemical Modification: Removal of Malachite Green from Aqueous Media. *Journal of Polymers and the Environment*, 31(12).
DOI: 10.1007/s10924-023-03045-z

1977. The failure processes, morphology and mechanical properties of a co-polyimide glass based on benzophenone tetracarboxylic acid dianhydride. *Journal of Materials Science*, 12(7).
DOI: 10.1007/bf00540847