The present invention is to provide a coated paper for industrial inkjet printing presses comprising: a base paper, and a coating layer containing at least one selected from the group consisting of a cationic resin and a water-soluble polyvalent cationic salt, and a pigment containing kaolin, on the base paper; wherein the content of the kaolin is 30 parts by mass to 80 parts by mass based on 100 parts by mass of the pigment in the coating layer, an arithmetic mean roughness (Ra) stipulated in JIS B 0601:2001 (ISO 4287:1997) of a coated paper surface on the side where the coating layer is located is 4.5 μm to 7.5 μm, the coated paper surface on the side where the coating layer is located has 1 to 350 protruding parts per 1.0 square centimeter, and the protruding part is a protruding part having the maximum width of 10 μm to 100 μm measured using a photographed image of the coated paper surface taken by magnifying 50 times using an electron microscope.

According to the present invention, coated paper for industrial inkjet printing presses that achieves excellent uniformity in color densities and ink absorbability, that has capability of suppressing strike-through of inks, and that achieves excellent paper feeding characteristics can be provided.

Hydrophilic cationic dispersion polymers, compositions including same, and methods of using same. In some examples, a composition can include a hydrophilic cationic dispersion polymer disposed on a surface of a substrate. The substrate can be a paper, a textile, a non-woven material, a film, or mixtures thereof. The hydrophilic cationic dispersion polymer can include repeating units derived from a first monomer and a second monomer. The first monomer can be a nonionic monomer and the second monomer can be at least one hydrophilic cationic monomer selected from a diallyl-N,N-dimethylammonium halide and a monomer of the formula I: where A.sub.1 can be O or NH; B.sub.1 can be a C.sub.2-C.sub.4 alkylene or hydroxypropylene; R.sub.1 can be H or CH.sub.3; R.sub.2 and R.sub.4 can independently be a C.sub.1-C.sub.2 alkyl; R.sub.3 can be H or a C.sub.1-C.sub.2 alkyl; and X.sub.1 can be an anionic counterion.

##STR00001##

Hydrophilic cationic dispersion polymers, compositions including same, and methods of using same. In some examples, a composition can include a hydrophilic cationic dispersion polymer disposed on a surface of a substrate. The substrate can be a paper, a textile, a non-woven material, a film, or mixtures thereof. The hydrophilic cationic dispersion polymer can include repeating units derived from a first monomer and a second monomer. The first monomer can be a nonionic monomer and the second monomer can be at least one hydrophilic cationic monomer selected from a diallyl-N,N-dimethylammonium halide and a monomer of the formula I: where A.sub.1 can be O or NH; B.sub.1 can be a C.sub.2-C.sub.4 alkylene or hydroxypropylene; R.sub.1 can be H or CH.sub.3; R.sub.2 and R.sub.4 can independently be a C.sub.1-C.sub.2 alkyl; R.sub.3 can be H or a C.sub.1-C.sub.2 alkyl; and X.sub.1 can be an anionic counterion.

##STR00001##

A paper material and a flexible packaging material using the same are provided. At least one surface of the paper material is coated with a first coating layer and a second coating layer. The paper has an air permeability greater than 45200 sec and a dyne value less than 40 dyn/cm. The first coating layer includes an inorganic filler and a first water-based heat-sealable coating, and the first water-based heat-sealable coating includes a polyolefin dispersion, an ethylene acrylic acid copolymer, or a styrene acrylate emulsion. The second coating layer includes an inorganic filler and a second water-based heat-sealable coating, and the second water-based heat-sealable coating includes a polyolefin dispersion, an ethylene acrylic acid copolymer, a styrene acrylate emulsion, or polyvinyl alcohol.

Disclosed are a biodegradable coating composition for a mulching paper and a mulching paper. Out of these, the biodegradable coating composition for mulching paper to be coated on a surface of mulching paper comprises: spring water prepared by immersing a mineral substance powder that includes sericite powder and has a particle size distribution of 400 to 700 mesh in a container containing water for 10 to 20 days and thus dissolving a mineral component of a mineral substance in water at 45 to 72 parts by weight; charcoal powder having a particle size of 1,000 to 3,000 mesh at 3 to 8 parts by weight; calcium solution at 8 to 13 parts by weight; a filler including sulfur powder, illite powder, and expanded vermiculite powder at 5 to 15 parts by weight; starch at 5 to 8 parts by weight; and an additive at 10 to 20 parts by weight.

Disclosed are a biodegradable coating composition for a mulching paper and a mulching paper. Out of these, the biodegradable coating composition for mulching paper to be coated on a surface of mulching paper comprises: spring water prepared by immersing a mineral substance powder that includes sericite powder and has a particle size distribution of 400 to 700 mesh in a container containing water for 10 to 20 days and thus dissolving a mineral component of a mineral substance in water at 45 to 72 parts by weight; charcoal powder having a particle size of 1,000 to 3,000 mesh at 3 to 8 parts by weight; calcium solution at 8 to 13 parts by weight; a filler including sulfur powder, illite powder, and expanded vermiculite powder at 5 to 15 parts by weight; starch at 5 to 8 parts by weight; and an additive at 10 to 20 parts by weight.

The present disclosure is drawn to primer compositions, which can include a binder including polyvinyl alcohol, starch nanoparticles, and a crosslinkable polyurethane dispersion. The primer competitions can also include a cationic salt and water.

The present invention relates to a method for producing mineral particles grinding a mineral material in the presence of a specific anionic polymer. The polymer used is obtained by means of polymerisation in the presence of sodium hypophosphite, disodium dipropionate trithiocarbonate and at least one radical-generating compound. The invention also relates to an aqueous composition comprising particles of ground mineral material and such a polymer, in particular a paper coating slip composition.

The present invention relates to a method for producing mineral particles grinding a mineral material in the presence of a specific anionic polymer. The polymer used is obtained by means of polymerisation in the presence of sodium hypophosphite, disodium dipropionate trithiocarbonate and at least one radical-generating compound. The invention also relates to an aqueous composition comprising particles of ground mineral material and such a polymer, in particular a paper coating slip composition.

The present invention provides a book paper suitable for both inkjet and offset printing. The inventive printing paper comprises a base substrate with a grammage of below 100 gsm comprising at least 50 wt % mechanical cellulosic pulp fibers and having a total filler content of below 15 wt %. The substrate is surface treated with a composition comprising pigments in a range of 15-30 wt %, starch in a range of 20-40 wt %, latex in a range of 10-20 wt % and a multivalent metal salt in a range of 10-30 wt %.