Diimonium salt compound, near-infrared ray absorbing filter and optical information recording medium
A near-infrared absorbing filter, characterized in that it contains at least one compound represented by the following formula (1): (1), wherein R1 to R8 may be the same or different and at least one of them is a branched alkyl group, a ring A and a ring B may have a substituent, and X represents an...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A near-infrared absorbing filter, characterized in that it contains at least one compound represented by the following formula (1): (1), wherein R1 to R8 may be the same or different and at least one of them is a branched alkyl group, a ring A and a ring B may have a substituent, and X represents an anion necessary for neutralizing the electric charge. The near-infrared absorbing filter is excellent in thermal resistance. |
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