Aminium salt or diimonium salt compounds and use thereof

DETAILED DESCRIPTION What is claimed is: 1.
An aminium salt or diimonium salt compound consisting the aminium or diimonium cation and an anion, said aminium cation having a skeletal structure represented by Formula (1) as described below: ##STR9## (in the formula (1), m is an integer of 1 or 2), said diimonium cation having a skeletal structure represented by Formula (2) as described below: ##STR10## (in the formula (2), m is an integer of 1 or 2), wherein the two nitrogen atoms (quaternary nitrogen atoms in Formula (2)) bound to the ring A in Formula (1) or Formula (2) bind to the four phenyl groups B, and wherein the phenyl groups B are optionally each substituted at their respective 4-positions with an amino group, and at least one of said four amino groups has a cyanoalkyl group as a substituent.
2.
An aminium salt or diimonium salt compound according to claim 1, wherein said cyanoalkyl group is a cyano (C1-C5) alkyl group.
3.
An aminium salt or diimonium salt compound according to claim 1 or 2, wherein all of said four amino groups are substituted with a respective cyanoalkyl group.
4.
An aminium salt or diimonium salt compound according to claim 3, wherein said amino groups having said cyanoalkyl groups are di(cyanoalkyl)amino groups.
5.
An aminium salt or diimonium salt compound according to claim 4, wherein said cyanoalkyl groups are cyanopropyl groups.




Description:
TECHNICAL FIELD The present invention relates to an aminium salt or diimonium salt compound being absorptive in the infrared region, and the shaped product containing the compound, especially the optical recording medium or the infrared ray screening filter.
BACKGROUND ART An aminium salt or a diimonium salt, the infrared absorbent, has been widely used for a heat insulating film or sunglasses.
However, the salt as a dyestuff has problems in heat fastness and light fastness because it is liable to deterioration by light or heat during a production process.
An organic dyestuff such as the cyan dyestuff is proposed to use for optical recording media, especially only one time writable optical disks such as CD-R and DVD-R and optical cards