To provide a surface sizing agent for papermaking, which has good low foamability and mechanical stability and has an excellent sizing effect. The surface sizing agent for papermaking is a surface sizing agent for papermaking, comprising a composition obtained by polymerizing unsaturated monomers in the presence of a starch, wherein the amount of the starch is 25 to 40 mass % based on the total amount of the starch and the unsaturated monomers, the unsaturated monomers comprise at least a styrenic compound and a (meth)acrylic ester compound, and the amount of the styrenic compound is 10 mass % or more and less than 30 mass %, and the amount of the (meth)acrylic ester compound is 20 to 50 mass %, based on the total amount of the starch and the unsaturated monomers.

A coating composition is described that can be completely biodegradable and well suited for use in laminating films to substrates. The coating composition contains a biodegradable polymer, such as a polyvinyl alcohol polymer. The coating composition can be applied to a biodegradable film and then adhered to a substrate, such as a paper substrate.

A coating composition is described that can be completely biodegradable and well suited for use in laminating films to substrates. The coating composition contains a biodegradable polymer, such as a polyvinyl alcohol polymer. The coating composition can be applied to a biodegradable film and then adhered to a substrate, such as a paper substrate.

A biodegradable food-grade polyvinyl alcohol (PVA) paper substrate and a method for making the same are provided. The method includes: providing a paper substrate; preparing a first coating material by rendering PVA with a degree of alkalization of 90%-100% and a molecular weight of 100,000-300,000 into an aqueous solution in which the PVA has a weight ratio of 3%-15%; preparing a second coating material by rendering sodium trimetaphosphate into an aqueous solution in which the sodium trimetaphosphate has a molar concentration of 0.05-1 Mol/l; forming a coating layer on a surface of the paper substrate; forming a surface cross-linked layer on the coating layer; and drying. The resulting PVA paper substrate is biodegradable, of food-grade quality, and resistant to water and grease, with a grease resistance higher than or equal to that corresponding to kit No. 6 in a TAPPI T559 pm-96 standard test.

A method for producing a paper, which includes applying at least one of ionizing radiation and plasma to at least one of a paper base and a compound (A) selected from: a compound having a carbon-carbon unsaturated bond and containing no fluorine atom in a molecular structure, and a compound containing no fluorine atom in a molecular structure in which radicals are generated by irradiation of an electron beam to the compound, to introduce a layer formed from the compound (A) on a surface of the paper base.

A method for producing a paper, which includes applying at least one of ionizing radiation and plasma to at least one of a paper base and a compound (A) selected from: a compound having a carbon-carbon unsaturated bond and containing no fluorine atom in a molecular structure, and a compound containing no fluorine atom in a molecular structure in which radicals are generated by irradiation of an electron beam to the compound, to introduce a layer formed from the compound (A) on a surface of the paper base.

The present invention provides an aqueous dispersion that enables production of a film having improved water resistance, tensile elastic modulus, and stress at break, and with which a decrease of strain at break can be reduced in the film. The present invention relates to an aqueous dispersion comprising an ethylene-vinyl alcohol copolymer (A) and a cellulose nanofiber, the ethylene unit content of the ethylene-vinyl alcohol copolymer (A) being 1 mol % or more and less than 20 mol %.

Provided are a printing sheet having a coating layer for receiving ink on at least one surface of a substrate and having excellent printability, excellent adhesiveness between the substrate and the coating layer, and excellent antistatic performance and thus being less likely to cause troubles such as paper jams during printing, and further having excellent properties such as water resistance and weather resistance in a printing sheet; and a method for producing the same. The printing sheet includes a coating layer formed by blending (meth)acrylic ester-based resin particles in a proportion of 1% by mass or more and 10% by mass or less and clay in a proportion of 50% by mass or more and 70% by mass or less in a continuous phase made of an acrylic polymer.

Provided are a printing sheet having a coating layer for receiving ink on at least one surface of a substrate and having excellent printability, excellent adhesiveness between the substrate and the coating layer, and excellent antistatic performance and thus being less likely to cause troubles such as paper jams during printing, and further having excellent properties such as water resistance and weather resistance in a printing sheet; and a method for producing the same. The printing sheet includes a coating layer formed by blending (meth)acrylic ester-based resin particles in a proportion of 1% by mass or more and 10% by mass or less and clay in a proportion of 50% by mass or more and 70% by mass or less in a continuous phase made of an acrylic polymer.

Printed matter includes a substrate comprising a vinyl chloride resin and a printing layer on the substrate, wherein the surface of the substrate has a static friction coefficient of from 0.04 to 0.06 and a dynamic friction coefficient of from 0.02 to 0.03 when the surface of the substrate is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g, wherein the surface of the printing layer has a static friction coefficient of from 0.35 to 0.50 and a dynamic friction coefficient of from 0.20 to 0.30 when the surface of the printing layer is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g.