An acrylamide-based polymer which contains one or more multiquaternized (multiquat) monomer unit(s) is provided. The acrylamide-based polymer can be used in a papermaking process to reduce pitch and stickies deposition, improve retention and drainage, and enhance dry strength properties of paper. Also included is a method of controlling pitch and stickies deposition in papermaking comprising treating pulp slurry with an acrylamide-based polymer which contains one or more multiquaternized (multiquat) monomer unit(s).

An acrylamide-based polymer which contains one or more multiquaternized (multiquat) monomer unit(s) is provided. The acrylamide-based polymer can be used in a papermaking process to reduce pitch and stickies deposition, improve retention and drainage, and enhance dry strength properties of paper. Also included is a method of controlling pitch and stickies deposition in papermaking comprising treating pulp slurry with an acrylamide-based polymer which contains one or more multiquaternized (multiquat) monomer unit(s).

A method for obtaining diallyldialkylammonium halide includes the reaction between allyl halide and a dialkylamine. At least one of the two is at least partially renewable and non-fossil. The diallyldialkylammonium halide can be used as a bio-sourced diallyldialkylammonium halide monomer to produce a bio-sourced polymer incorporating at least the monomer. The polymer can be used in various technical fields.

A method for obtaining diallyldialkylammonium halide includes the reaction between allyl halide and a dialkylamine. At least one of the two is at least partially renewable and non-fossil. The diallyldialkylammonium halide can be used as a bio-sourced diallyldialkylammonium halide monomer to produce a bio-sourced polymer incorporating at least the monomer. The polymer can be used in various technical fields.

A 1-ply toilet paper includes a leaf bleached kraft pulp and a needle bleached kraft pulp, as constituting fibers, mass % of the needle bleached kraft pulp being 15 to 55 mass %; 0.024 to 0.075 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound; and 0.015 to 0.075 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound, wherein a basis weight is 21.0 to 22.5 g/m.sup.2, wherein a paper thickness is 110 to 155 m, wherein a degree of elongation is 14 to 25%, wherein an MMD is less than 9.3, wherein dry tensile strength in a longitudinal direction is 245 to 330 cN/25 mm, and wherein dry tensile strength in a lateral direction is 85 to 135 cN/25 mm.

The invention relates to a method for reducing starch content of an aqueous phase, which is removed from a fibre stock preparation in a manufacturing process of paper, board, tissue or the like. The fibre stock preparation comprises a thickening step, where a fibre stock comprising cellulosic fibres originating from recycled fibre material and/or broke as well as starch dispersed in an aqueous phase is thickened from a first concentration to a second concentration by removing a part of the aqueous phase from the fibre stock. A cationic polymer obtained by copolymerisation of (meth)acrylamide and at least 25 mol-% of solely cationic monomer(s), having a standard viscosity SV of at least 1.7 mPas, is added to the fibre stock at the latest at the thickening step in order to associate the starch with the cellulosic fibres of the fibre stock.

The invention relates to a method for reducing starch content of an aqueous phase, which is removed from a fibre stock preparation in a manufacturing process of paper, board, tissue or the like. The fibre stock preparation comprises a thickening step, where a fibre stock comprising cellulosic fibres originating from recycled fibre material and/or broke as well as starch dispersed in an aqueous phase is thickened from a first concentration to a second concentration by removing a part of the aqueous phase from the fibre stock. A cationic polymer obtained by copolymerisation of (meth)acrylamide and at least 25 mol-% of solely cationic monomer(s), having a standard viscosity SV of at least 1.7 mPas, is added to the fibre stock at the latest at the thickening step in order to associate the starch with the cellulosic fibres of the fibre stock.

The disclosure provides methods and compositions for increasing the dry strength of paper. The invention utilizes a tailored strength agent whose size and shape is tailored to fit into the junction points between flocs of a paper sheet. The strength agents is in contact with the slurry for just enough time to collect at the junction points but not so much that it can migrate away from there.

The disclosure provides methods and compositions for increasing the dry strength of paper. The invention utilizes a tailored strength agent whose size and shape is tailored to fit into the junction points between flocs of a paper sheet. The strength agents is in contact with the slurry for just enough time to collect at the junction points but not so much that it can migrate away from there.

A method and a reactor to crystalize calcium carbonate and to form crystals in a liquid flow (F) with the concentration of 2.5% to 5% inside or on the surfaces of a fiber dispersion containing solid matter. The method includes feeding carbon dioxide (CO.sub.2) and lime milk (LM) (Ca(OH).sub.2) into the liquid flow and reacting the CO.sub.2 with the Ca(OH).sub.2 wherein the carbon dioxide (CO.sub.2) and/or lime milk (LM) is injected with a mixer crosswise into the liquid flow (F) and the injection is performed with a feed tube (2) to cause a dwell time of the crystallizing reaction of 0.5 to 10 seconds before a nozzle (20) of the reactor (1), after which the liquid flow (F) is mixed with the liquid or fiber suspension in container (4)