Abstract: Disclosed is a heat-sensitive recording material comprising an undercoat layer and a heat-sensitive recording layer in this order on a support, the undercoat layer containing hollow particles, a binder, and an inorganic pigment I, the heat-sensitive recording layer containing a leuco dye, a developer, and an inorganic pigment II, and the heat-sensitive recording layer containing an N,N?-diarylurea-based compound represented by the following formula (1): wherein R2s may be the same or different, and each represents C1-12 alkyl, C7-12 aralkyl, or C6-12 aryl, and the aralkyl and the aryl may be each substituted with C1-12 alkyl, C1-12 alkoxy, C6-12 aryl, or halogen; A1s may be the same or different, and each represents hydrogen or C1-4 alkyl, as the developer, and a pigment with an oil absorption of 130 ml/100 g or less as the inorganic pigment II.

Abstract: A multicolor thermal recording material that allows multicolor printing in at least four colors and a method for developing color of the multicolor thermal recording material.

Abstract: The present invention provides a multicolor thermal recording material that allows multicolor printing in at least four colors, depending on differences in the conditions of applying heat from a thermal head, and that is inexpensive and has excellent material selectivity, as well as providing a method for developing color of the multicolor thermal recording material.

Abstract: An ink jet recording material appropriate to ink recording, preferably pigment ink recording, has an ink receiving layer formed on a support and including a pigment containing amorphous silica, alumina and/or alumino silicate, a binder, and a cationic resin having a cation equivalent of 1.5 to 6 milli equivalent/g, as determined by a colloid titration method.

Abstract: An ink jet recording sheet having a high water resistance and capable of recording thereon clear ink images includes a substrate polymeric film or sheet; an undercoat layer formed on the substrate and including a polymeric binder having a glass transition temperature of 50° C. or less and optionally pigment particles having an oil absorption of 250 ml/100 g or less and/or an aspect ratio of 2.0 to 100.0; and an ink receiving layer including a pigment and a polymeric binder.

Abstract: An ink-jet recording sheet, having an excellent ink absorption and capable of forming images with high color density and sharpness, includes a substrate and an ink-receiving layer, formed on the substrate, which includes a pigment, a self-emulsifying cationic resin including a water-insoluble acrylic copolymer having a cationic functional group and capable of being emulsified in water without assistance of an emulsifying agent, a water-soluble non-ionic polymeric material and a water-soluble cationic resin.

Abstract: An ink jet recording sheet, capable of recording pigment ink images having an excellent resistance to rough handling and a high weather resistance and thus being useful for advertisement sheets, has a polymeric film support, a lower ink receiving layer containing a water-insoluble polymeric material and amorphous synthetic silica particles and formed on the support directly or through an undercoat layer, and an upper ink receiving layer containing a water-insoluble polymeric material, amorphous synthetic silica particles and a silanol-modified polyvinyl alcohol, and exhibiting a Bekk smoothness of 5 to 40 seconds.

Abstract: An ink jet recording sheet having a high water resistance and capable of recording thereon clear ink images includes a substrate polymeric film or sheet; an undercoat layer formed on the substrate and including a polymeric binder having a glass transition temperature of 50° C. or less and optionally pigment particles having an oil absorption of 250 ml/100 g or less and/or an aspect ratio of 2.0 to 100.0; and an ink receiving layer including a pigment and a polymeric binder.

Abstract: An ink jet recording material capable of recording clear ink images having a high color density at a high speed without blotting the ink image and provided with a high surface strength has an ink receiving layer formed on a support, which may be a plastic film or a synthetic paper sheet, including synthetic amorphous silica particles and a binder, the surface of the ink receiving layer being characterized by exhibiting a peak area ratio (C.sub.1 s/Si.sub.2 p) of carbon electron 1s to silicon electron 2p of 6.0 to 35.0, determined by an X-ray photo-electron spectroscopy.