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US 11,591,753 B2Granted
Method of producing hydrophobic paper
AssigneeSca Forest Products AB
InventorsRaquel Bohn Stoltz, Birgitta Lindberg
Life of this patent
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Abstract
The present disclosure relates to a method of producing hydrophobic paper, using a sizing additive based on depolymerized lignin and a hydrophobic paper obtainable by such method.
Claims16
A method of producing hydrophobic paper comprising the step of adding
- (i) a sizing additive comprising a blend of a depolymerized lignin having an average molecular weight of 400-2500 g/mol with an auxiliary component selected from a cationic polysaccharide and/or gelatin,
- (ii) an aluminum salt, and
- (iii) optionally a retention aid,
- to a lignocellulosic pulp suspension at the wet end of a paper manufacturing process,
- wherein the depolymerized lignin is added in an amount of 0.5 to 20 kg/t dry pulp calculated as dry weight of depolymerized lignin, and the aluminum salt is added in an amount corresponding to at least 0.01 kg Al/t dry pulp.
2 more elements
A method comprising adding, during production of hydrophobic paper, a blend of a depolymerized lignin having an average molecular weight of 400-2500 g/mol with an auxiliary component selected from a cationic polysaccharide and/or gelatin as the sole sizing additive in the production of hydrophobic paper.
Dependencies are inferred from the claim text.