Abstract: 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.

Abstract: A coloring matter absorbing a near-infrared ray which comprises a diimonium salt containing a sulfonimide as an anion moiety, represented by the general formula (1): wherein R may be the same or different and represents a moiety selected from the group consisting of an alkyl group, a halogenated alkyl group, a cyanoalkyl group, an aryl group, a hydroxyl group, a phenyl group, and a phenylalkylene group, and R1 and R2 may be the same or different and each represent a fluoroalkyl group, or together form a fluoroalkylene group. The coloring matter absorbing a near-infrared ray is excellent in the resistance to heat and moisture, and thus exhibits an ability of absorbing a near-infrared ray not lowering for a long period of time.

Abstract: A coloring matter absorbing a near-infrared ray which comprises a diimonium salt containing a sulfonimide as an anion moiety, represented by the general formula (1): wherein R may be the same or different and represents a moiety selected from the group consisting of an alkyl group, a halogenated alkyl group, a cyanoalkyl group, an aryl group, a hydroxyl group, a phenyl group, and a phenylalkylene group, and R1 and R2 may be the same or different and each represent a fluoroalkyl group, or together form a fluoroalkylene group. The coloring matter absorbing a near-infrared ray is excellent in the resistance to heat and moisture, and thus exhibits an ability of absorbing a near-infrared ray not lowering for a long period of time.

Abstract: There is disclosed an ink-jet recording material which comprises a support in which both surfaces of a base paper are covered by a polyolefin resin, and an ink-receptive layer containing inorganic fine particles and a hydrophilic binder provided on the support, wherein a surface of the support opposite to the surface at which the ink-receptive layer is provided has a ten-point mean roughness Rz measured according to JIS-B-0601 of boarding is 12 to 40 &mgr;m under the condition of a reference length of 8 mm, and preferably a ratio of a total length X of a mean line across the mountain part to a total length Y of a mean line across a valley part, X/Y is 1/10 to 3/1.

Abstract: There is disclosed an ink-jet recording material which comprises a support in which both surfaces of a base paper are covered by a polyolefin resin, and an ink-receptive layer containing inorganic fine particles and a hydrophilic binder provided on the support, wherein a surface of the support opposite to the surface at which the ink-receptive layer is provided has a ten-point mean roughness Rz measured according to JIS-B-0601 of boarding is 12 to 40 &mgr;m under the condition of a reference length of 8 mm, and preferably a ratio of a total length X of a mean line across the mountain part to a total length Y of a mean line across a valley part, X/Y is 1/10 to 3/1.

Abstract: The present invention provides a heat sensitive recording material which comprises an aromatic isocyanate compound, an imino compound which reacts with said aromatic isocyanate compound upon application of heat to form a color and a metallic soap which is pulverized together with said imino compound. Preferably the metallic soap has an average particle diameter of 0.5-2.0 .mu.m. This heat sensitive material is excellent in sensitivity and can form an image or excellent stability.

Abstract: There is disclosed a heat sensitive recording material comprising a color-forming agent consisting of an aromatic isocyanate compound and an imino compound, and a phenol compound; said recoridng material being excellent in storability of image and storability of non-image area as well.