PAPER MAKING PROCESS

摘要

A paper making process comprises: (a) adding to an aqueous paper furnish containing pulp and optionally inorganic filler a water-soluble polyparticulate polysilicate microgel and a water-soluble cationic polymer, and (b) forming and drying the product of step (a), wherein the microgel has an average particle size in the range 20 to 250 nm and a surface area in excess of 1000 m2/g. The polysilicate microgel is preferably a polyaluminosilicate, especially one having a mole ratio of alumina : silica of between 1:10 and 1:1500. The use of such microgels leads to improved drainage and retention characteristics.