Synthesis of novel positive type photosensitive polyimide

Tricyclic aliphatic dianhydride monomer, tricyclo[4.2.2.0]dec-9-ene exo,endo-3,4:7,8-tetra-carboxyliodianhydride (TCDDA), was synthesized by photochemical reaction and poly(amic acid)s from TCDDA and diamines such as 1,4-bis-(4-aminophenoxy)benzene (BAB), 2,2-bis(4-(4-aminophenoxy) phenyl) propane (BAPP), 2,2-bis(4-(4-aminophenoxy)phenyl)hexafluoropropane (BAPHF), bis(4-(4-aminophenoxy) phenyl)sulfone (BAPS), and 1,4-bis-(4-aminophenoxy)biphenyl (BABP) were prepared. The inherent viscosities of the poly(amic acid)s were between 0.39 and 0.50 dUg. The poly(amic acid)s were converted to polyimide films by thermal imidization. The glass transition temperatures T,) of the polyimides were in the range of 201 similar to 263 degreesC. The thermogravimetric analysis (TGA) thermogram of these polyimides showed the temperatures of 5% weight losses between 375 and 393 degreesC in nitrogen atmosphere. To show their utility for image generation, degradations of these polyimides in UV exposure were investigated by UV spectroscopy.