Patent ID: 9404223
Filing Date: 2016-08-02
CPC Classification: D21H

Claim Text:
1. A process of making paper or paperboard, comprising: shearing a cellulosic thin stock, adding a retention system to the cellulosic thin stock, draining the cellulosic thin stock on a moving screen to form a wet sheet, and drying the wet sheet, wherein (1) the retention system comprises as components: (2) the blend of different cationic polymers comprises: (3) one of the components of the retention system (i) or (ii) is dosed into the cellulosic thin stock after a final shearing stage and the other component is dosed into the cellulosic thin stock before the final shearing stage, (4) the blend of different cationic polymers comprises 0.05% to 30% by weight of cationic polymer (a), based on the total weight of the blend of different cationic polymers, (5) the blend of different cationic polymers comprises 0.05% to 2% by weight of cationic polymer (b), based on the total weight of the blend of different cationic polymers, (6) the dose of cationic polymer (a) is 50 to 3000 ppm, based on the active weight of cationic polymer (a) on the dry weight of the cellulosic thin stock, and (7) the dose of cationic polymer (b) is 50 to 1000 ppm, based on the active weight of cationic polymer (b) on the dry weight of the cellulosic thin stock.