Abstract: A method of manufacturing a newsprint paper for offset printing, includes: selecting a filler or fillers having an average grain size of 0.5 to 5 ?m and a zeta potential of 0 mV or above; providing a pulp slurry for making a base paper; adding the filler or fillers to the pulp slurry in an amount of more than 15 percent by weight but less than 40 percent by weight as ash relative to the dry weight of the base paper; and subjecting the resultant slurry to a papermaking machine to obtain the base paper.

Abstract: A method of manufacturing a newsprint paper for offset printing, includes: selecting a filler or fillers having an average grain size of 0.5 to 5 ?m and a zeta potential of 0 mV or above; providing a pulp slurry for making a base paper; adding the filler or fillers to the pulp slurry in an amount of more than 15 percent by weight but less than 40 percent by weight as ash relative to the dry weight of the base paper; and subjecting the resultant slurry to a papermaking machine to obtain the base paper.

Abstract: A printability improving agent for use in a neutral newsprint base paper which is printed with ecological inks, containing (I) a cationic copolymer obtained by polymerizing one or more hydrophobic monomer unit(s) selected from styrenes and alkyl acrylates and/or alkyl methacrylates with a quaternary ammonium salt-containing monomer unit, and (II) a copolymer obtained by polymerizing 100 parts by weight of one or more hydrophobic monomer(s) selected from the group above in the presence of 1-10 parts by weight of a surfactant.

Abstract: A method of manufacturing a newsprint paper for offset printing, includes: selecting a filler or fillers having an average grain size of 0.5 to 5 ?m and a zeta potential of 0 mV or above; providing a pulp slurry for making a base paper; adding the filler or fillers to the pulp slurry in an amount of more than 15 percent by weight but less than 40 percent by weight as ash relative to the dry weight of the base paper; and subjecting the resultant slurry to a papermaking machine to obtain the base paper.

Abstract: Newsprint for offset printing having sufficient water absorption resistance to provide a clear printing image with less color registration problems upon offset printing is manufactured by coating base paper, to which aluminum sulfate (a 50% by weight Al2O3.14H2O product) is added at a ratio of less than 3.0% by weight upon paper making, with a surface treating agent mainly comprised of (A) a water-soluble macromolecular substance selected from starches, PVAs, polyacrylamides, and cellulose derivatives, (B) a copolymer obtained by the copolymerization of a styrene monomer and a cationic monomer, a water-soluble copolymer obtained by the copolymerization of a styrene monomer, a cat ionic monomer and a hydrophobic monomer, or a water-soluble copolymer obtained by treating one of these copolymers in which a tertiary amine-containing vinyl monomer is used as a cationic monomer, with a quaternizing agent.

Abstract: Provide a paper offering good paper strength properties in terms of strength and stiffness, high smoothness and excellent printing quality by adjusting the ash content in paper to a range of 3 to 40 percent by solid weight and allowing the paper to contain a pre-coagulated filler having an average particle size of 10 to 80 ?m as measured by the laser diffraction method, wherein such filler is obtained by processing a filler using a composite acrylamide copolymer comprising (A) an anionic polysaccharide and (B) a cationic and/or amphoteric acrylamide copolymer.

Abstract: Coat a starch-based surface-paper-strengthening agent on a base paper made from a paper material that contains at least chemically processed hardwood mechanical pulp and bulk-increasing agent; where it is desirable that the hardwood mechanical pulp with a single fiber density index of 0.20 or more be blended by 10 to 60 weight-% of the total weight of pulp, with the adding amount of bulk-increasing agent adjusted to 0.1 to 1.2 weight-% and the coating amount of starch-based surface-paper-strengthening agent, to 0.3 to 3.0 g/m2.

Abstract: Produce a slipping property imparting agent for clear coat that reduces scum production: wherein, (1) the agent comprises a copolymer whose constituents are unsaturated olefin (constituent (a)) and unsaturated carboxylic acid (carboxylate) (constituent (b)); (2) constituent (a) accounts for 50 to 99 mol percent and constituent (b) accounts for 50 to 1 mol percent, respectively, of the total mol number of constituents (a) and (b) combined; and (3) a constituent (c) that can be polymerized with the constituents (a) and (b) is contained, as necessary, by up to 20 mol percent of the total mol number of constituents (a) and (b) combined.

Abstract: The present invention aims to provide printability improving agents and surface-treating agents capable of improving offset printability of papers, especially newsprint papers to be printed with offset inks as well as papers, especially newsprint papers that can be successfully printed with offset inks. According to a first aspect of the present invention, a printability improving agent comprising a cationic copolymer consisting of one or more hydrophobic monomer unit(s) selected from a specific group and a quaternary ammonium salt-containing monomer unit or a surface-treating agent comprising the printability improving agent and a water-soluble polymer material selected from a specific group is applied on the surface of a base paper, especially a newsprint base paper.

Abstract: The object of the present invention provides a newsprint paper having a friction coefficient in an appropriate range, a sufficient sizing quality, a low “neppari” strength and excellent printability. A newsprint paper having a static friction coefficient in an appropriate range of 0.44-0.74, a sufficient sizing quality and a low “neppari” strength can be obtained by applying a coating solution containing an alkenyl ketene dimer represented by general formula 1 below and a paper surface-modifying agent on a newsprint base paper, especially a neutralized newsprint base paper containing 1% by weight or more and 30% by weight or less of calcium carbonate as a filler and 50% by weight or more of deinked pulp. wherein R1 and R2 represent an unsaturated hydrocarbon group containing 8-30 carbon atoms.

Abstract: Provide a newsprint paper for offset printing that offers good printing efficiency and print quality, wherein the paper, despite a high content of deinked pulp, notably suppresses show-through in offset printing and also reduces paper powder deposit on the blanket cylinders of the press. Adding a filler or fillers by more than 15 percent by weight but less than 40 percent by weight as ash relative to the paper weight notably suppresses show-through of a newsprint paper for offset printing. In particular, adding calcium carbonate with an average grain size of 0.5 to 5 ?m and zeta potential of 0 mV or above by more than 15 percent by weight but less than 40 percent by weight as ash relative to the paper weight not only suppresses show-through further but also reduces the paper powder deposit on the blanket cylinders of the press.

Abstract: Newsprint for offset printing having sufficient water absorption resistance to provide a clear printing image with less color registration problems upon offset printing is manufactured by coating base paper, to which aluminum sulfate (a 50% by weight Al2O3.14H2O product) is added at a ratio of less than 3.0% by weight upon paper making, with a surface treating agent mainly comprised of (A) a water-soluble macromolecular substance selected from starches, PVAs, polyacrylamides, and cellulose derivatives, (B) a copolymer obtained by the copolymerization of a styrene monomer and a cationic monomer, a water-soluble copolymer obtained by the copolymerization of a styrene monomer, a cationic monomer and a hydrophobic monomer, or a water-soluble copolymer obtained by treating one of these copolymers in which a tertiary amine-containing vinyl monomer is used as a cationic monomer, with a quaternizing agent.

Abstract: A surface-treatment agent containing at least one type of processed starch selected from a) to c) as listed below is applied to a base paper of a newspaper so that a product of a B-type viscosity of the surface-treatment agent, measured under conditions of 10% concentration at 50° C. (rotor No. 1 at 60 rpm), and an application amount of the surface-treatment agent (both sides) is within a range of 2 to 15 cps·g/m2; a) Etherified starch, which is etherified by the compound defined in the general formula (1) given below: (AO)nH??(1) wherein A represents an ethylene group or propylene group, while n represents an integer of 1 to 15, b) Carboxylic acid esterified starch, which is esterified by monocarboxylic acid or dicarboxylic acid containing a linear, branched or cyclic alkyl group or alkenyl group having carbon atoms of 4 to 18, and c) Aldehyde starch.

Abstract: Produce a slipping property imparting agent for clear coat that reduces scum production: wherein, (1) the agent comprises a copolymer whose constituents are unsaturated olefin (constituent (a)) and unsaturated carboxylic acid (carboxylate) (constituent (b)); (2) constituent (a) accounts for 50 to 99 mol percent and constituent (b) accounts for 50 to 1 mol percent, respectively, of the total mol number of constituents (a) and (b) combined; and (3) a constituent (c) that can be polymerized with the constituents (a) and (b) is contained, as necessary, by up to 20 mol percent of the total mol number of constituents (a) and (b) combined.

Abstract: Coat a starch-based surface-paper-strengthening agent on a base paper made from a paper material that contains at least chemically processed hardwood mechanical pulp and bulk-increasing agent; where it is desirable that the hardwood mechanical pulp with a single fiber density index of 0.20 or more be blended by 10 to 60 weight-% of the total weight of pulp, with the adding amount of bulk-increasing agent adjusted to 0.1 to 1.2 weight-% and the coating amount of starch-based surface-paper-strengthening agent, to 0.3 to 3.0 g/m2.

Abstract: An object of the present invention is to provide a newsprint paper having a friction coefficient in an appropriate range, a sufficient sizing quality, a low “neppari” strength and excellent printability.

Abstract: A surface-treatment agent containing at least one type of processed starch selected from a) to c) as listed below is applied to a base paper of a newspaper so that a product of a B-type viscosity of the surface-treatment agent, measured under conditions of 10% concentration at 50° C. (rotor No.