3,3’,4,4’-Benzophenone tetracarboxylic dianhydride (BTDA) is, chemically, an aromatic organic acid dianhydride.
Uses Its use in epoxy powder coatings is slightly unusual in that many epoxy coatings are designed to be fairly close to a stoichiometric curing ratio. BTDA cured materials benefit from having the stoichiometry closer to 0.65 rather than 1. It is also used to synthesize polyimides. These have good flexibility because of the carbonyl and keto groups which increase the molecular distancing between the imide rings. This improves the solubility.F. Röhrscheid "Carboxylic Acids, Aromatic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. The resultant product when combined with nano-technology produces composites with enhanced heat stability properties.
Safety It is REACH and TSCA registered. Exposure causes serious eye irritation and may cause respiratory irritation.
Trademark The name BTDA is a registered trademark of company Jayhawk Fine Chemicals Corporation.
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