ASYMMETRIC SQUARILIUM COMPOUND AND FILTER CONTAINING THE COMPOUND AND USED FOR IMAGE DISPLAY EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a filter excellent in durability and used for image display equipment and to provide a squarilium coloring compound contained in the filter. SOLUTION: The asymmetrical squarilium compound is represented by formula (1) (wherein m is an integer of 1-4; R1is a halogen, an alkyl, an alkoxy, or an alkenyl; n is an integer of 0-4; R2to R4are each an alkyl; and R5is hydrogen, a halogen, an alkyl, or an alkoxy, provided that the sum of m and n is 1-5 and that R1s are the same or different from each other when n is 2 or larger). COPYRIGHT: (C)2004,JPO