초록 ▼

Starch is added to the thinstock in a papermaking process in the form of a coagulated slurry containing undissolved starch particles, cationic polymeric flocculant and anionic microparticulate network agglomeration aid, such as bentonite. The flocculant and agglomeration aid interact to give network

Starch is added to the thinstock in a papermaking process in the form of a coagulated slurry containing undissolved starch particles, cationic polymeric flocculant and anionic microparticulate network agglomeration aid, such as bentonite. The flocculant and agglomeration aid interact to give network flocculation in which the starch particles are trapped. Improved retention of the starch in the resulting paper is achieved.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process of making paper containing starch, comprisingproviding a cellulosic thin stock suspension,flocculating the suspension by adding an aqueous solution of polymeric retention aid and thereby forming a flocculated suspension,optionally shearing the flocculated susp

[ What is claimed is:] [1.]1. A process of making paper containing starch, comprisingproviding a cellulosic thin stock suspension,flocculating the suspension by adding an aqueous solution of polymeric retention aid and thereby forming a flocculated suspension,optionally shearing the flocculated suspension and reflocculating the sheared suspension by adding aqueous anionic bridging coagulant and thereby forming a reflocculated suspension,draining the flocculated or reflocculated suspension through a moving screen to form a wet sheet, andcarrying the sheet through a heated drying zone and thereby forming a dry sheet,wherein the process also comprisesproviding a coagulated slurry which contains undissolved starch particles and which is substantially free of filler by combining undissolved starch particles and cationic polymeric flocculant and an anionic microparticulate network agglomeration aid to give network flocculation of the network agglomeration aid in which the starch particles are trapped, andadding the coagulated slurry to the cellulosic suspension, andthe undissolved starch particles are heated during the drying and release dissolved starch into the sheet in the presence of moisture, wherein the dry sheet retains at least 2% by weight of starch.