| 摘要 |
PURPOSE: A polyimide having low light absorption loss at a near infrared light wavelength range, easy to control reflected indexes, excellent in solubility to an organic solvent and processability and capable of effectively protecting the increase of light absorption loss and the lowering of adhesion property and coatability of a film is provided which is very useful as an optical material in the optical communication field using light of a near infrared light region. CONSTITUTION: A polyimide for optical communications has a monomer, represented by the formula (1), as a repeating unit. In formula, R1, R2, R3 and R4 are selected from the group consisting of H, Cl, F, I, Br, CF3, CCl3, a nonsubstituted aromatic ring and a halogenated aromatic ring, n is an integer from 1 to 39. The use of the polyimide as materials for forming a waveguide layer extends the selection width for buffer layer material.
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