A starch-based coating compound for packaging materials, in particular for paper, pasteboard or cardboard, wherein the starch has a molecular weight in the range of 800,000 to 50,000,000 g/mol, preferably in the range of 800,000 to 20,000,000 g/mol. The coating compound is used for surface-sealing packaging materials, to prevent the passage of mineral oil contaminants from the packaging material into packaged goods. The subject disclosure furthermore relates to a multi-layer packaging material, which is produced using the coating compound, and to a method for producing said packaging material.

Discloses is a packaging paper for food having a grammage between 20 g/m.sup.2 and 40 g/m.sup.2, and having a filler content of less than 20 wt. % relative to the weight of the uncoated paper. On at least one side the packaging paper has a coating that contains a vegetable oil encapsulated in a polymer, and also talc and a binder. Both sides of the finished packaging paper have a Cobb 60 value of 14 g/m.sup.2 to 22 g/m.sup.2.

Discloses is a packaging paper for food having a grammage between 20 g/m.sup.2 and 40 g/m.sup.2, and having a filler content of less than 20 wt. % relative to the weight of the uncoated paper. On at least one side the packaging paper has a coating that contains a vegetable oil encapsulated in a polymer, and also talc and a binder. Both sides of the finished packaging paper have a Cobb 60 value of 14 g/m.sup.2 to 22 g/m.sup.2.

A coated paperboard includes a recycled paperboard substrate having a first side and a second side, a first aqueous barrier coating applied over the first side, and a second aqueous barrier coating applied over the first aqueous barrier coating. The first aqueous barrier coating is formed from a mixture of binder and pigment. The second aqueous barrier coating is formed from a mixture of binder and pigment.

A coated paperboard includes a recycled paperboard substrate having a first side and a second side, a first aqueous barrier coating applied over the first side, and a second aqueous barrier coating applied over the first aqueous barrier coating. The first aqueous barrier coating is formed from a mixture of binder and pigment. The second aqueous barrier coating is formed from a mixture of binder and pigment.

The invention discloses a method of producing a filler composition to be used in paper or board production, said method comprising providing a suspension comprising calcium hydroxide and performing carbonation of the calcium hydroxide to form precipitated calcium carbonate (PCC). The invention is characterized in that starch and/or carboxy methyl cellulose (CMC) is added to the suspension during said carbonation of calcium hydroxide. The method of the invention enables an increased filler content in paper or paperboard without substantially increasing the dusting tendency or decreasing the strength of the paper or board.

The invention discloses a method of producing a filler composition to be used in paper or board production, said method comprising providing a suspension comprising calcium hydroxide and performing carbonation of the calcium hydroxide to form precipitated calcium carbonate (PCC). The invention is characterized in that starch and/or carboxy methyl cellulose (CMC) is added to the suspension during said carbonation of calcium hydroxide. The method of the invention enables an increased filler content in paper or paperboard without substantially increasing the dusting tendency or decreasing the strength of the paper or board.

A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.

A method for the production of paper products, such as paper and cardboard, by recycling cellulose-based raw materials containing starch. The method includes the steps of pulping in water cellulose-based raw materials containing starch, particularly recycled paper products, obtaining a pulped mass; adding to the pulped mass of the previous step under agitation a mineral acid in a quantity that is suitable to obtain a pH of the pulped mass not lower than 4, and obtaining a pulped mass treated with acid. The method further includes the step of subjecting the pulped mass treated with acid obtained in the second step, optionally treated with other chemical additives, in succession, to filtration, pressing and drying, and obtaining a paper product. Paper products obtainable by this method are also related.

A coated paperboard is disclosed which includes a printable coating containing substantially no fluorochemical or wax in which the coated paperboard is fully compostable as well as repulpable, and exhibits no tendency toward blocking. The coating may be a multiple layer coating.