Sca Forest Products Ab

Birgitta Lindberg

Anette Bergmark

Raquel Bohn Stoltz

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.

Method of producing hydrophobic paper

A method of preparing a sizing boost additive, includes: I) combining a lignin oil and an aqueous solution of gelatinized cationic polysaccharide to obtain a lignin/polysaccharide blend, wherein the lignin oil is obtained by base catalyzed depolymerization of lignin; and the gelatinized cationic polysaccharide is prepared by cooking dry cationic polysaccharide in water until completely gelatinized; and wherein a weight ratio of lignin oil:polysaccharide in the blend is 1:0.5-2, where the weight of the polysaccharide is the weight of dry polysaccharide added in preparation of the aqueous solution of gelatinized cationic polysaccharide; and the combined weight of lignin and polysaccharide is 1-10 wt-% based on the total weight of the resulting blend; followed by II) mixing the lignin/polysaccharide blend at a temperature of 40-100&#xb0; C., until the blend has changed color from grey-white to brown.

Growing community of inventors

Sundsvall, Sweden

Birgitta Lindberg