2421-28-5 Usage
Description
3,3',4,4'-Benzophenonetetracarboxylic dianhydride (BTDA) is a white crystalline powder formed by the hydrolysis of benzophenone-3,3',4,4'-tetracarboxylic acid. It can be converted to the dianhydride by treating with Ac2O (molar ratio 4 to 1 of acid). The dianhydride is used to synthesize polyimides, which are highly flexible in nature due to the presence of keto and carbonyl groups in the dianhydride molecule. The keto and carbonyl groups subsequently increase the spacing between the imide rings, enhancing the solubility and processibility.
Uses
Used in the Industrial Sector:
3,3',4,4'-Benzophenonetetracarboxylic dianhydride is used as an intermediate in the manufacture of plastic products or fine chemicals. It is also important as a monomer of polyimide and is used for the production of polyimide material.
Used in the Synthesis of Polyimides:
BTDA is used as a monomer in the synthesis of polyimides, which are high-performance polymers with a range of applications due to their excellent thermal stability, mechanical properties, and chemical resistance.
Used in the Production of Polyimide Material:
BTDA is used as a monomer for the production of polyimide material, which is known for its high-temperature resistance, mechanical strength, and chemical stability.
Used in the Production of BTDA Polymer Fine Free-Flowing Powder:
BTDA is used to produce a fine-free-flowing powder suitable for general purposes. The BTDA Microfine Micronized powder facilitates mixing in epoxy resins.
Used in the Production of BTDA Ultrapure High-Purity Powder:
BTDA is used to produce an ultrapure, high-purity, high-assay powder for critical polyimide synthesis, ensuring the quality and performance of the final product.
Physical Properties:
BTDA is a tan-colored crystalline powder with a melting point of 218.67 °C and shows decomposition at 360 °C. The auto-ignition temperature is very high, and no flammability is observed. The substance has a density of 1.5452 g/ml and a vapor pressure of 6.53E-011 Pa. The substance is slightly water-soluble and has a log Pow of 3.3.
Health Hazard
BTDA has no acute toxicity by oral and inhalative route or by dermal exposure. The substance is irritating to eyes and the respiratory tract. BTDA is sensitizing to skin. BTDA is not mutagenic.
Environmental effects
Based on available data for the substance, BTDA is harmful to aquatic organisms with long lasting effects. The substance is not readily biodegradable and is not considered to have potential to bioaccumulate.BTDA is industrially used as monomer to manufacture the rmoplastics or another substance. The manufacture and handling is a closed process, thus only very limited exposure to the environment is expected. Any exposure from manufacture or use will generally be below the level of concern.
Flammability and Explosibility
Nonflammable
Purification Methods
The main impurity is the free acid formed by hydrolysis (check for OH bands in the IR). This can be converted to the dianhydride by treating with Ac2O (molar ratio of 4 to 1 of acid), heating at 110-120o for 1.5 to 2hours, cooling to 0—5o and collecting the dianhydride. This is then dissolved in hot dioxane or Me2CO, filtered and cooled to 10—15o. The moisture sensitive solid is collected and dried at 120—130o in vacuo. It has been sublimed at high vacuum. [Faberov et al. J Org Chem USSR 4 153 (English translation) 1968.]
Check Digit Verification of cas no
The CAS Registry Mumber 2421-28-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,2 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 2421-28:
(6*2)+(5*4)+(4*2)+(3*1)+(2*2)+(1*8)=55
55 % 10 = 5
So 2421-28-5 is a valid CAS Registry Number.
2421-28-5Relevant articles and documents
Development and optimization of producing 3,3′, 4,4′-benzophenonetetracarboxylic dianhydride
Yegorov, Anton Sergeyevich,Wozniak, Alyona Igorevna,Ivanov, Vitaly Sergeyevich,Averina, Elena Aleksandrovna,Zhdanovich, Olga Anatolevna
, p. 3063 - 3070 (2016)
This paper includes a series of experiments conducted in order to develop a laboratory method for producing 3,3′, 4,4′-benzophenonetetracarboxylic dianhydride and selection of the optimum conditions, allowing to obtain the greatest yield. 3,3′, 4,4′-benzophenonetetracarboxylic dianhydride is used for the preparation of polyimides with high thermal stability, chemical resistance as well as high strength and high Young's modulus. Benzophenonetetracarboxylic dianhydride was prepared by multistep route: Friedel-Crafts alkylation of o-xylene to obtain 3,3′, 4,4′-tetramethyl benzophenone followed by liquid phase oxidation to benzophenonetetracarboxylic acid and dehydration.
Bronsted base-assisted boronic acid catalysis for the dehydrative intramolecular condensation of dicarboxylic acids
Sakakura, Akira,Ohkubo, Takuro,Yamashita, Risa,Akakura, Matsujiro,Ishihara, Kazuaki
supporting information; experimental part, p. 892 - 895 (2011/05/02)
Bronsted base-assisted boronic acid catalysis for the dehydrative self-condensation of carboxylic acids is described. Arylboronic acid bearing bulky (N,N-dialkylamino)methyl groups at the 2,6-positions can catalyze the intramolecular dehydrative condensation of di-and tetracarboxylic acids. This is the first successful method for the catalytic dehydrative self-condensation of carboxylic acids.(Figure Presented)
Inkjet ink
-
, (2008/06/13)
The invention relates to a method for manufacturing an inkjet ink including a polyamic acid (A), including a step of at least reacting one or more compounds selected from the group of a monoamine (a3) and a compound having one acid anhydride group (a4) with a compound having two or more acid anhydride groups (a1) and a diamine (a2).