Abstract: An ink jet recording medium comprising a substrate and an ink receiving layer which is provided on at least one surface of the substrate and contains inorganic fine particles having an average secondary particle size of 1-4 ?m as measured by a Coulter counter method in an amount of 0.2-2.0 g/m2 in terms of solid content mass. The ink receiving layer satisfies the following conditions with respect to a pore distribution curve as determined by a nitrogen adsorption method: (1) total pore volume in a pore size range of 10-30 nm is 0.25 ml/g or more, (2) total pore volume in a pore size range of 30-70 nm is 0.1 ml/g or more, and (3) volume ratio of the total pore volume in the pore size range of 10-30 nm to the total pore volume in the pore size range of 30-70 nm is from 1:0.4 to 1:1.

Abstract: A high quality ink jet recording medium with a printed image non-vulnerable and excellent in scratch resistance is obtained with an ink jet recording using a water pigment ink. An ink jet recording medium having a substrate and an ink receiving layer including an inorganic particle and a binder on the substrate is provided. A surface of the ink receiving layer has (a) a projected valley portion depth (Rvk) of not less than 20 nm and not more than 100, (b) an arithmetic average roughness (Ra) of not less than 5 nm and not more than 100 nm, and (c) an average spacing (S) of local peaks of not more than 1.0 ?m.

Abstract: Provided is an ink jet recording medium including a substrate a porous layer containing one of a dry-process silica and an alumina hydrate and a silica layer containing spherical colloidal silica particles having a particle size of 105 nm or more and 200 nm or less. The porous layer and the silica layer are formed on the substrate in this order. The porous layer is covered by the spherical colloidal silica particles at a coverage of 40% or more and 75% or less.

Abstract: An ink jet recording medium comprising a substrate and an ink receiving layer which is provided on at least one surface of the substrate and contains inorganic fine particles having an average secondary particle size of 1-4 ?m as measured by a Coulter counter method in an amount of 0.2-2.0 g/m2 in terms of solid content mass. The ink receiving layer satisfies the following conditions with respect to a pore distribution curve as determined by a nitrogen adsorption method: (1) total pore volume in a pore size range of 10-30 nm is 0.25 ml/g or more, (2) total pore volume in a pore size range of 30-70 nm is 0.1 ml/g or more, and (3) volume ratio of the total pore volume in the pore size range of 10-30 nm to the total pore volume in the pore size range of 30-70 nm is from 1:0.4 to 1:1.

Abstract: A laminating method for forming a laminated layer in the form of a transparent film on a surface of an image on a printed object includes the steps of transferring a laminate having a laminated layer and a heat resistive base material layer to the surface of the printed object for laminating to form a laminated printed object, and a rear edge peeling step of peeling off the heat resistive base material layer from a rear edge portion of the laminated printed object by exerting an active force on the rear edge of the printed object in the carrying direction. Subsequently to the rear edge peeling step, a front edge peeling step peels off the heat resistive base material layer from a front edge of the laminated printed object.

Abstract: A high quality ink jet recording medium with a printed image non-vulnerable and excellent in scratch resistance is obtained with an ink jet recording using a water pigment ink. An ink jet recording medium having a substrate and an ink receiving layer including an inorganic particle and a binder on the substrate is provided. A surface of the ink receiving layer has (a) a projected valley portion depth (Rvk) of not less than 20 nm and not more than 100, (b) an arithmetic average roughness (Ra) of not less than 5 nm and not more than 100 nm, and (c) an average spacing (S) of local peaks of not more than 1.0 ?m.

Abstract: A recording method including the steps of: performing ink-jet recording on a recording medium including a paper substrate having two surfaces, on both of which are provided an ink receiving layer containing an inorganic pigment, and an outermost surface layer containing a thermoplastic latex resin; and heating the recording medium after the ink-jet recording. The ink receiving layer and the outermost surface layer are provided on both surfaces of a substrate in this order.

Abstract: A recording medium includes at least an ink receiving layer containing an inorganic pigment, and an outermost surface layer containing a thermoplastic latex resin. The ink receiving layer and the outermost surface layer are provided on each of both surfaces of a substrate in this order.

Abstract: A recording medium has a base member and an ink-receiving layer containing amorphous silica provided on the base member. The ink-receiving layer comprises a lower layer and an upper layer formed successively in lamination on the base member. The lower layer contains an anionic group, and the upper layer contains a cationic group.

Abstract: A recording medium has a base member and an ink-receiving layer containing amorphous silica provided on the base member. The ink-receiving layer comprises a lower layer and an upper layer formed successively in lamination on the base member. The lower layer contains an anionic group, and the upper layer contains a cationic group.

Abstract: In a process for producing a substrate for optical disks, first a disk-shaped substrate is formed with polycarbonate with such gradient distribution of double refraction that the value of double refraction is in a range from -10 to -30 nm in the vicinity of the external periphery of the substrate and is in a range from +10 to +30 nm in the vicinity of the center thereof, and then thus formed substrate is annealed.