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:
Apr. 05, 2011
Filed:
Jan. 08, 2005
Michael Persson, Västra Frölunda, SE;
Marek Tokarz, Kungälv, SE;
Maj-lis Dahlgren, Nödinge, SE;
Hans Johansson-vestin, Kungälv, SE;
Michael Persson, Västra Frölunda, SE;
Marek Tokarz, Kungälv, SE;
Maj-Lis Dahlgren, Nödinge, SE;
Hans Johansson-Vestin, Kungälv, SE;
Akzo Nobel N.V., Arnhem, NL;
Abstract
The invention relates to an aqueous sol containing silica-based particles which sol has a specific surface area of at least 115 m/g aqueous sol and an S-value within the range of from 10 to 45% or contains silica-based particles having a specific surface area of at least 550 m/g and less than 1000 m/g SiO. The invention further relates to processes for the production of said aqueous sol and the use of the aqueous sol containing silica-based particles as a drainage and retention aid in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which silica-based particles and at least one charged organic polymer are added to the cellulosic suspension.