PAPER-MAKING STOCK Russian patent published in 1994 - IPC

FIELD: wood-pulp and paper industry. SUBSTANCE: paper making stock contains fibrous semifinished product, filler and adhesive substance, including cationic starch and substituted anhydride of succinic acid with alkyl and alkenyl groups. Said starch is subjected to hydrodynamic treatment at flow rate of 1 to 30 m/s for 15-180 s. Stock contains its components in the following amounts, mas. part: fibrous semifinished product 100; filler 5-40; cationic starch 0.2-1.2; substituted anhydride of succinic acid 0.1-0.6. Cationic starch is used with substitution degree of 0.015 to 0.040. EFFECT: higher efficiency. 2 cl