Borate and near-infrared ray absorption material
AssigneeNippon Shokubai Co., Ltd.
InventorsAkio Ito, Satoshi Ishida, Toshiya Iida, Takako Ishii, Nobuhiro Kobayashi
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Abstract
A borate for a near-infrared ray absorption material, having an anion represented by the formula (1): [BR1mR24-m]− (wherein R1 represents an aryl group having an electron withdrawing group; R2 represents an organic group, a halogen group or a hydroxyl group; and m is an integer in the range of 1 to 4) is provided. The borate of the present invention enables to improve durability, in particular, heat resistance and moisture resistance of a near-infrared ray absorbing dye.
Claims16
A near-infrared ray absorption material comprising a borate which consists of a tetrakis(pentafluorophenyl) anion and a cation,
- wherein the cation is a cation not having near-infrared ray absorption ability that is selected from the group consisting of:
- sodium, ammonium, pyridinium, anilinium, imidazolium, pyrrolidinium, quinolinium, and a combination thereof, or the cation is a cation having near-infrared ray absorption ability in the range of greater than 740 nm to 1200 nm that is selected from the group consisting of:
- a diimmonium cation;
- a cyanine dye based cation;
- a cation represented by the formula (2):
- wherein R3 to R10 each independently represents a hydrogen atom, a halogen atom, an alkyl group having carbon atoms of 1 to 10, or an alkyl group having carbon atoms of 1 to 10 and having a substituent;
- an indolium-based cation;
- and a combination thereof,
- with the proviso that when the cation is the cation not having near-infrared ray absorption ability, the near-infrared ray absorption material further comprises a near-infrared ray absorbing dye.
Dependencies are inferred from the claim text.