Photosensitive polyimide adhesive sheet
Positive tone Photosensitive Polyimide B-stage sheet which was composed of transparent soluble polyimide, naphthoquinone diazide compound, thermal cross linker and solvent, was developed. We designed new polyimide structure and cross linker suitable for photosensitive polyimide sheet. The photosensitive sheet shows fine pattern formation capability as well as good thermal stability and mechanical properties. It is quite easy to obtain flat surface on topological surface to laminate the photosensitive sheet.
Fine Resolution Photosensitive Polyimide Dry Film with High Resistance to Electromigration under HAST condition
Abstract We investigated the effects of photosensitive system (positive and negative) and polymer structures on Cu migration under bias HAST test. The HAST condition is 130C for 85% RH. Bias condition is 2MV/m. We found that there is polyimide structure shows big effect is big effect of no big difference between negative photosensitivity and positive photosensitivity in photo sensensitive polyimides. Polyimide structure effects significant difference on Cu migration under bias HAST condition. Cu migration of soft polyimide seems better than that of rigid polyimide. From these results, we developed good reliable photosensitive polyimide B-sheet having fine pattern capability successfully.
Optical rotatory dispersion and absolute configuration—III
Abstract Optical rotatory dispersion measurements on pyrrolidine, piperidine, and tetrahydro-isoquinoline alkaloids indicate that the absolute configuration of the α-asymmetric center may be assigned directly from the dispersion curve, provided either that the nitrogen atom is not protonated, or that the compound contains a chromophore absorbing above 200 mμ.