摘要:
A near infrared absorbent dye is provided, having excellent heat resistance and excellent moisture resistance, as is a near infrared shielding filter using the dye. The near infrared absorbent dye contains an association form of a diimmonium salt compound represented by formula (1): wherein R1 to R8 are the same or different and each represents an organic group, and X− represents an anion.
摘要:
An object of the present invention is to provide a near infrared absorbent dye capable of providing a near infrared shielding filter with excellent transparency as well as high heat resistance and hygrothermal resistance.The near infrared absorbent dye is characterized in that it is made of the amorphous form of diimmonium salt represented by formula (1).