Abstract: The object of the present invention is to provide an ink jet recording material which has no cracks on the surface of the ink-receiving layer and possesses both the color developability and the absorbability of pigment inks. According to the present invention, there is provided an ink jet recording material formed by coating a coating solution of a pigment layer and a coating solution of at least one ink-receiving layer in succession on at least one side of a paper support and drying the resulting coating layers, wherein the pigment contained in the pigment layer has an average secondary particle diameter of not less than 1 ?m and not more than 5 ?m, 50% by volume or more of the total volume of the pigment has a secondary particle diameter of not less than 1.

Abstract: The object of the present invention is to provide an ink jet recording material which has no cracks on the surface of the ink-receiving layer and possesses both the color developability and the absorbability of pigment inks. According to the present invention, there is provided an ink jet recording material formed by coating a coating solution of a pigment layer and a coating solution of at least one ink-receiving layer in succession on at least one side of a paper support and drying the resulting coating layers, wherein the pigment contained in the pigment layer has an average secondary particle diameter of not less than 1 ?m and not more than 5 ?m, 50% by volume or more of the total volume of the pigment has a secondary particle diameter of not less than 1.

Abstract: An information recording material having an information recording layer formed on a substrate formed by applying by curtain-coating a coating film comprising two coating solution films of which the viscosity increases when the two coating solution films are brought into contact, or mixed, with each other. An intermediate coating solution film for isolating the two coating solution films one from the other and is provided between the two coating solution films. Alternatively, a curtain-coating composition film having at least one set of adjacent two layers of which the viscosity increases with the passage of time when the two layers are brought into contact, or mixed, with each other. Information recording materials having particularly excellent quality of applied layers and excellent in various properties with good productivity.

Abstract: Concerning a process for producing an information recording material having an information recording layer formed on a substrate, there are disclosed (1) a method of curtain-coating a coating composition film comprising two coating solution films of which the viscosity increases when the two coating solution films are brought into contact, or mixed, with each other and an intermediate coating solution film that is for isolating said two coating solution films one from the other and is provided between said two coating solution films, (2) a method of curtain-coating a coating composition film comprising at least one set of adjacent two layers of which the viscosity increases with the passage of time when the two layers are brought into contact, or mixed, with each other, (3) a method of applying water or an aqueous solution to a substrate surface and curtain-coating the substrate in a non-dry state with a coating composition film made of a plurality of layers, and (4) a method of curtain-coating a coating comp

Abstract: Disclosed is a method of producing, with good productivity, information recording materials such as a thermal recording material and an inkjet recording material excellent in coating properties and excellent in various properties. The method comprises forming a coating composition film made of a plurality of coating color layers on a substrate by curtain coating and drying the coating composition film to form part or all of layers for forming an information recording material, and either (1) adjusting the viscosity of each of the coating colors for a plurality of the coating color layers to at least 100 mPa·s and controlling the surface tension of the coating color for a lowermost layer to 18 to 45 mN/m, or (2) controlling the density of the coating color for a layer to be positioned above not to exceed 140% of the density of the coating color for an adjacent layer to be positioned below. The present invention has been completed on the basis of the above findings.

Abstract: There is disclosed a heat-sensitive recording material having a support and provided thereon a heat-sensitive recording layer mainly comprising a heat-sensitive recording component which forms a color by heating, the improvement wherein the heat-sensitive recording component comprises two or more kinds of compounds, and at least one of the compounds constituting the heat-sensitive recording component is contained in the heat-sensitive recording layer in the state of a particle on the surface of which is formed a color-formation controlling layer obtained by polymerizing a compound having an unsaturated carbon bond.

Abstract: As a reversible heat-sensitive recording material which contains a normally colorless or palely colored electron donating dye precursor and an electron accepting compound capable of causing said dye precursor to change reversibly in color density due to the difference in cooling rate after heating, one in which images can be formed and erased with good contrast and images high in time stability can be maintained under environment of everyday life can be obtained by using a phenolic compound having at least one aliphatic hydrocarbon group of 6 or more carbon atoms as the said electron donating compound.