| abstract |
NEW MATERIAL:The squarylium compound of formula I (R 1 is H or 1W13C alkyl; R 2 and R 3 are H, 1W13C alkyl or 1W13C alkoxy; R 2 and R 3 are substituted to the 5-. 6- or 8-position). n EXAMPLE: The compound of formula II. n USE: It exhibits an absorption peak at 700W800nm which is close to the oscillation wavelength of a semiconductor laser, and has excellent solubility and stability to liquid crystal. Accoringly a composition containing the liquid crystal is useful as a laser-writing liquid crystal display element to record and display with laser beam. It is useful also as a photo-sensitive material for electrophotography in the electrophotographic printer using a laser as the light source, a recording material of optical disk writable and readable with laser, and an infrared-cutting filter, etc. n PREPARATION: The compound of formula I can be prepared by reacting the compound of formula III with a squaric acid in a solvent. n COPYRIGHT: (C)1986,JPO&Japio |