SURFACE-MODIFIED FILLERS FOE PAPER SIZING Russian patent published in 2003 - IPC

FIELD: pulp and paper industry, production of protected paper. SUBSTANCE: invention presents the hydrophobic filler intended for obtaining a neutral, alkaline and acid paper. Filler contains fine- comminuted grained particles of a non-organic material, blended with a water soluble butylakrilate-acrylonitrile copolymer. The neutral or alkaline paper is described. The method relates to upgrading of the hydrophobic performances of the neutral or alkaline paper and provides for production of the filler and its addition to the cellulose fiber. The filler is prepared manufacturing filler and his(its) add-on to a cellulose fiber. Filler plot by selection of particles of the non-organic material and their blending with water soluble butylakrilate-acrylonitrile copolymer and formation of a hydrophobic system. EFFECT: the method allows to achieve the high performances of the paper sizing. 14 cl, 5 tbl, 6 ex