Fine-particle polymer dispersions for paper sizing

US6426381B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joachim Konig
• Eckhard Wenz · Neunburg vorm Wald, DE
• Gunter Sackmann · Leverkusen, DE
• Thomas Roick · Leverkusen, DE
• Bernd Thiele · Odenthal, DE
• Gabriele Kinkel · Monheim, DE
• Johan Kijlstra · Odenthal, DE
• Bernd Hauschel · Leverkusen, DE

Key dates

• Filing date: Aug 11, 2000
• Grant date: Jul 30, 2002
• Expiry date: Aug 11, 2020

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/72
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

This invention relates to aqueous polymer dispersions obtained by free radical emulsion copolymerization of ethylenically unsaturated monomers comprising(a) 30 to 60% by weight of at least one optionally substituted styrene,(b) 60 to 30% by weight of at least one C1-C4-alkyl (meth)acrylate, and(c) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers,in the presence of(d) 10 to 40% by weight of degraded starch having a molecular weight Mn of 500 to 10,000, and(e) a graft-linking, water-soluble redox system as free radical initiator for the free radical emulsion copolymerization,wherein the sum (a)+(b)+(c)+(d) is 100%.