'SOLUTION CONTAINING PARTICLES BASED ON SILICA, USE OF THE SOLUTION CONTAINING PARTICLES BASED ON SILICA AND PAPER PRODUCTION PROCESS'

摘要

Aqueous sol containing colloidal particles based on silica having an axial ratio of at least about 10 and S-value up to about 25 % is disclosed. Further the aqueous sol containing silica-based particles has an axial ratio in the range of from 10 to 100, wherein the silica-based particles are surface-modified. The disclosure also relates to a sol containing silica-based particles having a viscosity of at least 50 cP and silica content of at least about 3 % by weight, wherein the silica-based particles have a specific surface area of at least about 600 m2/g. The disclosure further relates to a process for producing the aqueous silica-based sol, a sol containing silica-based particles obtained by the process, use of the sol containing silica- based particles as a flocculating agent. The disclosure also relates to a process for producing paper in which the sol containing silica-based particles is used as a drainage and retention aid.