Patent Number: 7,708,862

Title: Paper production with modified silica gels as microparticles

Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.

Inventors: Meisel; Karlheinrich (Odenthal, DE), Thiele; Bernd (Bensheim, DE), Renner; Gerd-Friedrich (Kurten, DE), Kijlstra; Johan (Odenthal, DE), Nennemann; Arno (Bergisch Gladbach, DE), Hubbe; Thomas (Koln, DE), Puppe; Lothar (Burscheid, DE)

Assignee: Kemira Oyj

International Classification: D21H 21/10 (20060101)

Expiration Date: 5/04/12018