Abstract: A method for making paper is disclosed. The method comprising adding to a furnish comprising cellulosic, paper-making fibers (i) from about 0.05 to about 20 pounds per ton, based upon the dry weight of the furnish solids, of an ionic, organic, crosslinked polymeric microbead with a diameter of less than about 500 nm, and (ii) from about 0.05 to about 20 pounds per ton, same basis, of a polymeric material, containing vinylamine recurring units. In addition to the compositions described above, additives such as organic ionic, polysaccharides (e.g., a starch), may also be combined with the liquid system to facilitate drainage and retention.

Abstract: A method for providing improved liquid-solid separation performance in liquid particulate dispersion systems. The method comprising adding to a liquid system containing a plurality of finely divided particles (i) from about 0.05 to about 10 pounds per ton, based upon the dry weight of the particles, of an ionic, organic crosslinked polymeric microbead with a diameter of less than about 500 nm, and (ii) from about 0.05 to about 20 pounds per ton, same basis, of a polymeric material selected from the group consisting of polyethylenimines, modified polyethylenimines and mixtures thereof. In addition to the compositions described above, additives such as organic ionic polysaccharides (e.g., a starch), may also be combined with the liquid system to facilitate separation of the particulate material therefrom.

Abstract: In a papermaking process, improved drainage and retention are obtained when ionic, organic microbeads of less than about 1,000 nm in diameter if crosslinked or less about than 60 nm in diameter if noncrosslinked are added either alone or in combination with a high molecular weight organic polymer, and/or polysaccharide. Further addition of alum enhances drainage formation and retention properties in papermaking stock with and without the present of other additives used in papermaking processes.

Abstract: Novel compositions comprising anionic and/or amphoteric organic polymeric microparticles are disclosed, along with a method for their production. The products are useful in flocculating a wide variety of dispersions of suspended solids and in paper-making.

Abstract: In a papermaking process, improved drainage and retention are obtained when ionic, organic microbeads of less than about 1,000 nm in diameter if crosslinked or less about than 60 nm in diameter if noncrosslinked are added either alone or in combination with a high molecular weight organic polymer, and/or polysaccharide. Further addition of alum enhances drainage formation and retention properties in papermaking stock with and without the present of other additives used in papermaking processes.