| 摘要 |
PURPOSE:To provide the optical waveguide which has the sufficient heat resistance for production of photoelectron integrated circuits and decreases light transmission losses in a near IR region by using specific completely fluorinated polyimide as a constituting element. CONSTITUTION:The polyimide expressed by formula I among the polyimides obtd. from tetracarboxylic acid or its deriv. and diamine is used as the constituting element of the optical waveguide. In the formula I, Rf denotes fluorine, perfluoroalkyl group; X denotes -O-, -CO-, etc. Since the polyimide having the highest heat resistance among plastics is used for the core layer and clad layer of the optical waveguide, the solder heat resistance which is an important characteristic as an electronic material is sufficiently assured. The light transmittability is improved by introducing the fluorine into the polyimide. |
