Title:
SILICA-BASED SOLS AND THEIR PRODUCTION AND USE
Document Type and Number:
WIPO Patent Application WO2005100241
Kind Code:
A8
Abstract:
The invention relates to a process for producing an aqueous silica-based sol which comprises: (a) providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; (b) bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; (c) stirring said aqueous slurry until the pH of the aqueous phase is in the range of from 5.0 to 8.0; (d) adjusting the pH of said aqueous phase to above 9.0; and (e) separating said ion exchange resin from the aqueous phase after step (c) or after step (d). The invention also relates to an aqueous silica-based sol obtainable by the processes as well as a process for producing paper which comprises (i) providing an aqueous suspension comprising cellulosic fibres; (j) adding to the suspension one or more drainage and retention aids comprising an aqueous silica-based sol according to the invention; and (k) dewatering the obtained suspension to provide a sheet or web of paper.
Inventors:
MANKIN GLENN (US)
TOKARZ MAREK (SE)
HANSSON FREDDIE (SE)
TOKARZ MAREK (SE)
HANSSON FREDDIE (SE)
Application Number:
PCT/SE2005/000489
Publication Date:
March 01, 2007
Filing Date:
April 05, 2005
Export Citation:
Assignee:
AKZO NOBEL NV (NL)
EKA CHEMICALS AB (SE)
MANKIN GLENN (US)
TOKARZ MAREK (SE)
HANSSON FREDDIE (SE)
EKA CHEMICALS AB (SE)
MANKIN GLENN (US)
TOKARZ MAREK (SE)
HANSSON FREDDIE (SE)
International Classes:
C01B33/143; C01B33/14; D21H17/68; D21H21/10
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