| 摘要 |
PURPOSE:To improve salubility in a solvent and compatibility with a resin by incorporating a compd. having specific dye skeleton into a titled filter. CONSTITUTION:This filter contains the compd. having the dye skeleton expressed by the formula. The substituent to be attached to the dye skeleton expressed by the formula is exemplified by a hydrogen atom, substd. or unsubstd. alkyl group, etc. The amt of the dye to be used in preparing an IR absorption film or absorption plate is 0.01-20%, more preferably 0.05-2% by weight of the absorption film or absorption plate and the thickness thereof is usually 0.1mu-10mm, more preferably 1mu-2mm. The filter having excellent resistance to light and heat, high molecular extinction coefft., and excellent solubility in solvents and compatibility with resins is thereby obtd.
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