POLYIMIDE OPTICAL MATERIALS, POLYIMIDE PRECURSOR SOLUTIONS AND OPTICAL WAVEGUIDE ELEMENTS

摘要

Several novel polyimide materials are disclosed. One example is a polyimide material comprising heterocyclic polyimide having an unit represented by the following general formula (1): (wherein Phi₁s may be the same or different and are individually a quadrivalent organic group, the Phi₁s including at least 0.2 molar equivalent of a quadrivalent hetrocyclic group selected from the following Group (a), Psi₁s may be the same or different and are individually a bivalent organic group, and n is a positive integer).