Abstract: A recording paper comprising pulp fibers and a filler has a surface where pulp fibers bared to the surface and pulp fibers covered with particles are present together in portions. The quantity of ink transfer at a minimum ink-shoot time interval for adjacent dots with different colors as measured by Bristow's test method is not smaller than a maximum shot-in ink quantity per unit area of recording system used.

Abstract: A recording paper formed mainly from a fibrous material with a cationic substance applied onto the surface thereof or impregnated therein contains a non-wood fiber at least. An image forming method comprises forming an image on the recording paper by the steps of developing an electrostatic image on a photosensitive member by a developing means with a toner, transferring the developed toner image from the photosensitive member onto the recording paper, and fixing the transferred toner image on the recording paper. An image forming method comprises forming an image on the recording paper by ink-jet recording by applying, onto the recording paper, droplets of an ink containing at least an acid dye and/or a direct dye, water, and a water-soluble solvent.

Abstract: A recording method employing a medium that includes a substrate, and an ink-receiving layer provided thereon wherein the ink receiving layer contains water-insoluble and amorphous basic aluminum salt. In the recording medium, the basic aluminum salt is represented by the general formula (1) below:Al.sub.x (OH).sub.y X.sub.z (1)where x, y, and z are respectively positive integers and satisfy the relations of z=3x-y, and x/z.gtoreq.3, and X is an acid radical.

Abstract: Disclosed is a method for ink jet recording that has the steps of providing a stack of sheets which has a cleaning paper interspersed in each twenty to five hundred recording sheets in the stack, feeding the sheets from the stack to an ink jet recording unit, and printing with an ink jet printing unit on the fed sheet. The recording sheets are made of a coated layer that contains pigment formed on a base material and the cleaning paper has a Bekk smoothness of less than 40 seconds and a surface adhesion strength ranging from 1 to 500 gf as defined by JIS-Z-0237 and determined by a 90.degree. peel method.

Abstract: A recording head having an ejection portion group for ejecting a black ink, and ejection portion groups for ejecting color inks is used. When a black image to be printed by the black ink is present adjacent to a color image to be printed by the color ink, a black image portion adjacent to the color image and a black image portion which is not adjacent to the color image are formed in different scans, thereby obtaining a high-quality image from which ink blurring at a boundary portion between the black and color images is eliminated.

Abstract: A cast coated paper for ink jet recording is prepared by a process including the steps of: forming on a base paper an undercoating layer comprising alumina having a bulk density of at most 0.2 g/cm.sup.3 and an adhesive, applying onto the undercoating layer an overcoating liquid comprising a resin to form a wet overcoating layer, and pressing the wet overcoating layer against a heated drum having a mirror-finished surface to dry the overcoating layer, thereby forming a cast-coating layer. The resultant cast coated paper shows not only good gloss and ink jet recording performances (inclusive of ink absorptivity and recorded image density), but also good weather-fastness of recorded images.

Abstract: Disclosed herein is recording paper suitable for use in recording making use of a water-based recording liquid containing a dye which varies from water-soluble to water-insoluble according to the change of pH, wherein the recording paper is neutral or alkaline, and the surface pH of the paper is adjusted to a value not higher than the pH at which the dye turns water-insoluble.

Abstract: A cast coated paper for ink jet recording is constituted to include, in lamination: a base paper, an undercoating layer comprising a pigment and an adhesive, and a cast-coating layer comprising a polymer having a glass transition point of at least 40.degree. C. formed by polymerization of an ethylenically unsaturated monomer. The cast coated paper is preferably controlled to have an air permeability of at most 300 sec/100 cc. The undercoating preferably contains a cationic resin, particularly preferably a copolymer of a polyalkylenepolyamine and dicyandiamide. The cast coated paper thus produced with an excellent ink absorptivity suitable for ink jet recording while retaining a high surface gloss.

Abstract: Disclosed herein is recording paper suitable for use in recording making use of a water-based recording liquid containing a dye which varies from water-soluble to water-insoluble according to the change of pH, wherein the recording paper is neutral or alkaline, and the surface pH of the paper is adjusted to a value not higher than the pH at which the dye turns water-insoluble.

Abstract: A printing paper is provided which is neutral paper as the base paper comprising an ink-penetration retarder on a printing face to retard penetration of liquid ink containing a nitrogen compound, a substance as an internal additive of the paper to absorb ammonia or an ammonium ion released from the nitrogen compound in the ink, and a water-soluble inorganic salt in an amount ranging from 0.01 to 0.2% by weight. Printing methods are also provided which use the above printing paper.

Abstract: Disclosed is a marked sheet, wherein an intermediate layer, a transparent ink retaining layer and an opaque ink transporting layer are sequentially provided on the rear surface of a transparent sheet having an uneven pattern on the front surface, and a pattern is formed in the ink retaining layer.

Abstract: In a method of manufacturing and storing a recording sheet, a coating solution is coated on at least one surface of a base member and dried and a resulting recording sheet is cut and enclosed in a packaging material. The process from drying to enclosing is carried out in an atmosphere having a humidity not exceeding 50% RH.

Abstract: A recording paper comprising pulp fibers and a filler has a surface where pulp fibers bared to the surface and pulp fibers covered with particles are present together in portions. The quantity of ink transfer at a minimum ink-shoot time interval for adjacent dots with different colors as measured by the Bristow's test method is not smaller than a maximum shot-in ink quantity per unit area of recording system used.

Abstract: An ink-jet recording method for forming an image on a recording medium by ejecting ink droplets through an orifice of a recording head in response to a recording signals comprises ejecting an ink having a surface tension ranging from 25 to 35 dyn/cm onto a recording medium constituted of a base sheet and a coating layer formed on the base sheet to form an image, the coating layer being selected from (a), (b), and (c) below:(a) a coating layer mainly composed of polyvinyl alcohol of a saponification degree of from 75 to 98 mol % and a polymerization degree of from 100 to 500, or a derivative thereof.(b) a coating layer mainly composed of a copolymer of vinylpyrrolidone with a vinyl monomer having a hydrophobic group, and a polyalkylene oxide or a derivative thereof, and(c) a coating layer mainly composed of an aromatic polyvinylacetal resin, and a polyalkylene oxide or a derivative thereof.

Abstract: A recording medium having at least a pigment and a binder on the surface of a base, wherein the binder is comprised of at least water-soluble polyester. An ink jet recording method includes the step of performing recording on a recording medium by discharging ink from an orifice of an ink jet recording head in accordance with recording signals, wherein the recording medium has at least a pigment and a binder on the surface of a base, and wherein the binder is comprised of at least water-soluble polyester. The amount of the water-soluble polyester is 40% or more with respect to the total weight of the binder.

Abstract: An input stack of recording sheets and cleaning paper is provided. Each sheet is formed of a coated layer including pigment on a base material, while each cleaning paper has an adhesion strength ranging from 1 to 500 gf defined by JIS-Z-0237 and determined by a 90.degree. peel method and is interspersed in the recording sheets.

Abstract: A recording medium is provided which comprises a base sheet and an ink-receiving layer on at least one face of the base sheet, the ink-receiving layer containing at least: (i) polyvinyl alcohol or a derivative thereof, (ii) polyalkylene oxide or derivative thereof, and (iii) a hydrophilic acrylic resin composed of a copolymer of a first vinyl monomer having a cationic group with a second vinyl monomer having a hydrophobic group. A recording method is also provided which employs the above recording medium.

Abstract: An ink jet recording method includes a step in which dots of inks of different colors are superposed on a preselected region on a recording medium to form a color image. The recording medium is composed of a liquid-absorbing substrate and a surface layer formed on the substrate. The surface layer is composed mainly of a pigment and a binder. The ink jet recording method is characterized in that dots of at least two inks of different colors are formed in superposition within a time interval of 0.3 seconds. Preferably, the pigment in the surface layer of the recording medium is basic magnesium carbonate.

Abstract: A recording medium for ink-jet recording has an ink-receiving layer comprising spherical basic magnesium carbonate, amorphous magnesium carbonate or a mixture of aluminum oxide and basic magnesium carbonate. The recording medium promises a good storage stability of recorded images, i.e. less deterioration due to indoor color changes, together with a high image density.

Abstract: A recording medium contains, within an ink absorbent substrate per se or in an ink receiving coat layer formed on a substrate, basic magnesium carbonate together with a cationic surfactant and/or a nonionic surfactant. The recording medium is suitably used for color ink jet recording of the both-ways serial printing type and eliminates substantially the tone difference between forward and backward printings and the discoloration during indoor storage.