Benzophenone tetra-carboxylic dianhydride

Pis prepared with 4,4 -oxydianiline (ODA) and 3,3, 4,4 -benzo-phenone tetracarboxyhc dianhydride (BTDA) monomers, cf. Figure 6.1, can be loaded with 10 and 15 wt% tungsten nanoparticles that are treated with benzyl mercaptan. The 3,3, 4,4 -benzophenone tetra-carboxylic dianhydride and ODA monomers are reacted to form PI films that are flexible to the point of being creaseable. The nanocomposite films are effective as an electromagnetic radiation shield (5). 

GmbH), Polyimide photo alignment film from 3,3,4,4-benzophenone tetra-carboxylic dianhydride and ortho-substituted aromatic diamines for liquid crystal displays, C08G 73/00 (428/1.26) (October 2000). 

Another example is the Friedel-Crafts phosgene reaction with 0.xylene giving 3,3, 4,4 -tetramethylbenzophenone in high yield and free of isomers (Ref. 14). This substituted benzophenone is easily oxidized into benzophenone tetra-carboxylic acid dianhydride (BTDA) widely used for the manufacture of polyimides [Scheme 18] ... 

Poly(n,n1,4-pheny lene-3,3 4,4 -benzophenone tetra-carboxylic imid/amic acid Benzophenonetetraoarboxylio dianhydride-/ -phenylenedianiine polymer, SRU 26023-2 1-2 Poly( 1,3-dihydro-1,3-dioxo-2H-isoindole-2 5-diyl)carbonyl- (1,3-dihydro-1,3-dioxo-2H- isoindole-5,2-diyl)- 1,4-phenylene) U (C23H loNiO ),... 

The reaction of pyromellitic dianhydride or benzophenone-3,3, 4,4 -tetra-carboxylic anhydride with amino acids or lactams followed by condensation of the resulting diacids with diacetates of hydoquinone, 2,6-dihydroxynaph-thalene or 4,4 -dihydroxybiphenyl produced layer polymers (42). With the exception of the polymer with y=ll, all the polymers based on Ar = 4,4 -biphenylyl exhibit a smectic mesophase. The polymer with y = 10 and Ar = 1,4-phenylene exhibits a smectic mesophase. Polymers based on Ar = 1,4-phenylene or 2,6-naphthalene melt directly into an isotropic phase. 

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