The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2010
Filed:
Dec. 06, 1999
Michael Persson, Göteborg, SE;
Bozena Stanislawa Tokarz, Kungälv, SE;
Maj-lis Dahlgren, Nödinge, SE;
Hans Johansson-vestin, Kungälv, SE;
Michael Persson, Göteborg, SE;
Bozena Stanislawa Tokarz, Kungälv, SE;
Maj-lis Dahlgren, Nödinge, SE;
Hans Johansson-Vestin, Kungälv, SE;
Akzo Nobel NV, Arnhem, NL;
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.