Abstract: A recording paper used for an electrophotographic system is provided, wherein, in a gas chromatograph generated using a headspace method by holding two pieces of the paper of dimensions about 1 cm×about 1 cm at about 120° C. for about 3 minutes, the quantity of aldehyde compounds generated having a straight-chain alkyl chain of about 5 to about 20 carbon atoms is equivalent to a peak surface area ratio of no more than about 65% and a peak surface area of no more than about 40,000.

Abstract: A recording sheet including base paper including pulp fiber and filler, wherein the recording sheet further includes carboxylic acid. An ink jet recording method and an electrophotographic image recording method using the recording sheet.

Abstract: The present invention provides a recording paper comprising pulp fibers and filler as main components and containing at least a cationic substance and a water-soluble polymer in a surface of the recording paper, wherein conductivity of water is not less than 0.002 S/m as measured at 1 second after immersing a piece of the recording paper with an area of 0.05 m2 in 40 ml of pure water.

Abstract: A recording paper containing pulp fibers and filler as main components and containing at least a heterocyclic carboxylic acid and a water-soluble polymer in the surface of the recording paper, wherein the surface contains at least one kind of cationic substance selected from the group consisting of a cationic organic molecule and a metal salt containing a metal cation of valency two or greater.

Abstract: A recording sheet including base paper including pulp fiber and filler, wherein the recording sheet further includes carboxylic acid. An ink jet recording method and an electrophotographic image recording method using the recording sheet.

Abstract: A recording paper including a substrate which includes cellulose pulp and has a surface treated with a surface sizing solution, wherein the surface sizing solution contains a surface sizing agent and a nonionic surfactant having an HLB in a range of 6 to 13, a content of the nonionic surfactant is in a range of 1 to 100 parts by weight per 100 parts by weight of the surface sizing agent, and the surface sizing agent has a contact angle with water in a range of 40 to 75°.

Abstract: A recording paper using at least a cellulose pulp as a raw material includes a thermosetting material which is a natural product, an extract of a natural product or a derivative of a natural product.

Abstract: A recording sheet including a cellulose pulp, wherein a water retention value C of the sheet according to the following formula (1) is 50 to 100% and a wet tensile strength residual ratio R of the sheet in CD according to the following formula (2) is 5 to 20%: Water retention value C(%)={(A?B)/B}100 ??Formula (1) Wet tensile strength residual ratio R(%) in CD=(Sw/S)×100.

Abstract: A recording paper used for an electrophotographic system is provided, wherein, in a gas chromatograph generated using a headspace method by holding two pieces of the paper of dimensions about 1 cm×about 1 cm at about 120° C. for about 3 minutes, the quantity of aldehyde compounds generated having a straight-chain alkyl chain of about 5 to about 20 carbon atoms is equivalent to a peak surface area ratio of no more than about 65% and a peak surface area of no more than about 40,000.

Abstract: The present invention provides an ink set for ink jet recording using at least two kinds of liquids. The first liquid contains at least a colorant, a water soluble solvent and water, and the second liquid contains at least a compound represented by the following general formula (1), a water soluble solvent and water.

Abstract: A recording paper comprising: a plain paper conataining at least pulp as a raw material; and an organic acid having three or more carboxyl groups in a molecule, wherein the degree of CD shrinkage (%) of the paper is about 0.25 to about 0.65%.

Abstract: A recording sheet obtained by coating a base paper including pulp with a surface sizing agent including a starch as a main component, wherein the recording sheet exhibits a reflection density in a specific range when provided with a povidone-iodine liquid. Also disclosed is a recording sheet prepared by coating the surface of a base paper including a pulp fiber and a filler as main components with a processing liquid including a starch, wherein when 0.06 m2 of the recording sheet is subjected to hot water extraction, a solid amount of an extract is 0.01 to 0.4 g and a carboxyl group content in the solid is 0 to 5 meq/100 g.

Abstract: The present invention provides a recording paper comprising pulp fibers and filler as main components and containing at least a cationic substance and a water-soluble polymer in a surface of the recording paper, wherein conductivity of water is not less than 0.002 S/m as measured at 1 second after immersing a piece of the recording paper with an area of 0.05 m2 in 40 ml of pure water.

Abstract: A recording paper containing pulp fibers and filler as main components and containing at least a heterocyclic carboxylic acid and a water-soluble polymer in the surface of the recording paper, wherein the surface contains at least one kind of cationic substance selected from the group consisting of a cationic organic molecule and a metal salt containing a metal cation of valency two or greater.

Abstract: A recording sheet comprising a cellulose pulp, wherein a water retention value C of the sheet according to the following formula (1) is 50 to 100% and a wet tensile strength residual ratio R of the sheet in CD according to the following formula (2) is 5 to 20%: Water retention value C(%)={(A?B)/B}×100??Formula (1) Wet tensile strength residual ratio R (%) in CD=(Sw/S)×100.

Abstract: A recording paper including a substrate which includes cellulose pulp and has a surface treated with a surface sizing solution, wherein the surface sizing solution contains a surface sizing agent and a nonionic surfactant having an HLB in a range of 6 to 13, a content of the nonionic surfactant is in a range of 1 to 100 parts by weight per 100 parts by weight of the surface sizing agent, and the surface sizing agent has a contact angle with water in a range of 40 to 75°.

Abstract: In an ink jet recording method, a surface of a recording paper, in which a base paper contains a pulp fiber and a filler, one surface of the base paper being coated with a polyvalent metal salt in a coating amount of from 0.1 to 3 g/m2, having a basis weight of from 63 to 100 g/m2 and an internal bond strength of from 0.05 to 0.2 N·m is printed using an ink of at least one color made of at least a pigment, a water-soluble organic solvent, water and a surfactant and having a surface tension of from 25 to 37 mN/m. According to the method, the color reproduction is improved, the inter color bleeding and the feathering of characters are reduced, the double-sided printability is provided by reducing curling and cockling occurring immediately after printing, and curling and cockling occurring after allowing to stand and drying are also reduced.

Abstract: A recording sheet including base paper including pulp fiber and filler, wherein the recording sheet further includes carboxylic acid. An ink jet recording method and an electrophotographic image recording method using the recording sheet.

Abstract: The present invention provides a recording sheet which includes regular paper, that contains as a raw material at least a cellulose pulp, having added thereto a nonionic surfactant having an HLB value of higher than 6 and 13 or smaller in an amount of 0.1 g/m2 or more. The invention also provides a method for recording an image using the recording sheet.

Abstract: The present invention provides an ink set for ink jet recording using at least two kinds of liquids. The first liquid contains at least a colorant, a water soluble solvent and water, and the second liquid contains at least a compound represented by the following general formula (1), a water soluble solvent and water. The present invention also provides an ink jet recording apparatus comprising a recording head from which the ink set for ink jet recording is ejected, and an ink jet recording method by which an image is formed by applying the first and second liquids on a recording medium so as to contact each other.