CELLULOSE PARTICLES MODIFIED BY CATIONIC POLYELECTROLYTES, PROCESS FOR THE PRODUCTION, THEREOF, AND USE IN THE PRODUCTION OF THE PAPER AND BOARD

The invention relates to cellulose particles modified by cationic polyelectrolytes, said cellulose particles being particles composed of regenerated cellulose, comprising molecules of a first cationic polyelectrolyte having a molecular weight of 20 000 to 500 000 g/mol, and charge density of more than 3 meq/g, and molecules of a second cationic polyelectrolyte having a molecular weight of 2 to 10 million g/mol, and charge density of between 0.5 and 3 meq/g on the outer surface thereof. The invention is further directed to a process for the preparation of said modified cellulose particles, use thereof in the manufacture of paper and board, and to a process for manufacturing paper or board. The combination of retention and dewatering may be improved by the addition of the modified cellulose particles of the invention to the pulp during the manufacture of paper or board.