PAPER SHEETS TREATED BY POLYMERIC SUBSTANCES

Poly(vinyl acetate) (PVAc) and vinyl acetate with butyl acrylate (VAc- BuA) copolymer latices are prepared by semicontinuous emulsion polymer ization technique. The prepared latices are used in paper treatment us ing two different techniques. In the first technique, the latices are added during the paper sheet formation, but in the second one the untr eated paper sheets are dipped in either the polymer or acetone polymer solution of different concentrations. The effect of different concent rations of the prepared emulsion latices by using different emulsifier and initiator concentrations on the paper sheet is studied. Increasin g the initiator concentration in the preparation of PVAc latex decreas es the retained polymer on the treated paper sheets. Also, increasing the butyl acrylate percentage in the copolymer latices improves the me chanical properties. The water uptake of the treated paper sheets is d ecreased by increasing the retained polymer The effect of thermal trea tment of the treated paper sheets is investigated.