The present invention relates to a polymer dispersion, which comprises polymer particles dispersed in an aqueous continuous phase. The polymer particles are obtainable by a radical polymerisation of one or more vinyl monomers comprising alkyl (meth)acrylates. A rosin component is dissolved into at least one of the vinyl monomers before the radical polymerisation of the vinyl monomers, and the radical polymerisation is conducted in the presence of the rosin component. The invention relates also to the use of the polymer dispersion for surface sizing of a cellulosic fibre web and to a method for producing a polymer dispersion.

Lignocellulose composite products that include a hydrophobizing agent. The lignocellulose composite product can include a plurality of lignocellulose substrates, an at least partially cured binder composition, and a hydrophobizing agent. In one example, the hydrophobizing agent can include about 30 wt % to about 98 wt % of a fatty acid compound, about 0.1 wt % to about 15 wt % of a rosin acid compound, and about 1 wt % to about 40 wt % of an unsaponifiable compound. In another example, the hydrophobizing agent can include a tall oil pitch and a fatty acid composition.

Lignocellulose composite products that include a hydrophobizing agent. The lignocellulose composite product can include a plurality of lignocellulose substrates, an at least partially cured binder composition, and a hydrophobizing agent. In one example, the hydrophobizing agent can include about 30 wt % to about 98 wt % of a fatty acid compound, about 0.1 wt % to about 15 wt % of a rosin acid compound, and about 1 wt % to about 40 wt % of an unsaponifiable compound. In another example, the hydrophobizing agent can include a tall oil pitch and a fatty acid composition.

A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm/g, a fracture toughness index in the range of from 4 to 24 Jm/kg, and a ring crush index in the range of from 5 to 10 Nm/g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refined fibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.

The present application discloses a sizing method for making paper. An alkenyl succinic anhydride (ASA) is added to a papermaking process. An aluminum salt is added in one or more process steps during the papermaking process. Preferably, the aluminum salt is an aluminum salt which can generate free aluminum ion in aqueous solution. The sizing method of the present application enhances the usage efficiency of a sizing agent and the aluminum salt, as well as provides paper having a high moisture content.

The present application discloses a sizing method for making paper. An alkenyl succinic anhydride (ASA) is added to a papermaking process. An aluminum salt is added in one or more process steps during the papermaking process. Preferably, the aluminum salt is an aluminum salt which can generate free aluminum ion in aqueous solution. The sizing method of the present application enhances the usage efficiency of a sizing agent and the aluminum salt, as well as provides paper having a high moisture content.

A composition including a first fiber derived from a first natural source, and a second fiber derived from a fruit, the second fiber being substantially free of surface active components. Surface active components may include oils, fatty acids, or other aliphatic and aromatic moieties that compromise edge wick performance. A process of manufacturing a paperboard product may include removing surface active components from fruit fiber to be included in manufacturing paper products to obtain a paper product with improved edge wicking properties.

A composition including a first fiber derived from a first natural source, and a second fiber derived from a fruit, the second fiber being substantially free of surface active components. Surface active components may include oils, fatty acids, or other aliphatic and aromatic moieties that compromise edge wick performance. A process of manufacturing a paperboard product may include removing surface active components from fruit fiber to be included in manufacturing paper products to obtain a paper product with improved edge wicking properties.

There is provided a Kraft paper, wherein: the grammage according to ISO 536 is 60-120 g/m.sup.2; the bending resistance index in the machine direction is 105-200 Nm.sup.7/kg.sup.3; the bending resistance index in the cross direction is 60145 Nm.sup.7/kg.sup.3 (the bending resistance indexes are tested according to ISO 2493 using a bending angle of 15 and a test span length of 10 mm); the strain at break according to ISO 1924-3 in the machine direction is at least 3%; and the strain at break according to ISO 1924-3 in the cross direction is at least 5%.

There is provided a Kraft paper, wherein: the grammage according to ISO 536 is 60-120 g/m.sup.2; the bending resistance index in the machine direction is 105-200 Nm.sup.7/kg.sup.3; the bending resistance index in the cross direction is 60145 Nm.sup.7/kg.sup.3 (the bending resistance indexes are tested according to ISO 2493 using a bending angle of 15 and a test span length of 10 mm); the strain at break according to ISO 1924-3 in the machine direction is at least 3%; and the strain at break according to ISO 1924-3 in the cross direction is at least 5%.