Paper production with modified silica gels as microparticles

US7708862B2 · kind B2 · utility

Assignee

• KEMIRA OYJ · FI

Inventors

• Karlheinrich Meisel · Odenthal, DE
• Bernd Thiele · Odenthal, DE
• Gerd-Friedrich Renner · Lingen (Ems), DE
• Johan Kijlstra · Odenthal, DE
• Arno Nennemann · Bensberg, DE
• Thomas Hübbe · Cologne, DE
• Lothar Puppe · Burscheid, DE

Key dates

• Filing date: Jun 30, 2004
• Grant date: May 4, 2010
• Expiry date: Jun 5, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/64
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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