Polysilicate microgels

Details Polysilicate microgels Polysilicate microgels

1999-12-06

2010-02-16

Metzmaier, Daniel S (Department: 1796)

Compositions

Humidostatic, water removive, bindive, or emissive

C162S181600, C423S330100, C423S333000, C423S338000, C516S110000, C516S111000

Reexamination Certificate

active

07662306

ABSTRACT:
The present invention generally relates to polysilicate microgels. More specifically, the invention relates to a process for preparing aqueous polysilicate microgels which comprises mixing an aqueous solution of alkali metal silicate with an aqueous phase of silica-based material having a pH of 11 or less, to polysilicate microgels per se and to the use thereof as flocculating agents in paper making and water purification. The invention further relates to a process for the production of paper from a suspension of cellulosic fibers, and optional filler, which comprises adding to the suspension at least one cationic or amphoteric organic polymer and a polysilicate microgel, forming and draining the suspension on a wire.

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