Emulsion polymers

US5288787A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Sackmann · Leverkusen, DE
• Wolfgang Henning · Zorneding, DE
• Joachim Probst · Leverkusen, DE
• Joachim Konig
• Heinz Baumgen · Leverkusen, DE

Key dates

• Filing date: Jun 10, 1991
• Grant date: Feb 22, 1994
• Expiry date: Jun 10, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Emulsion polymers obtainable by emulsifying a mixture consisting of PA1 A) 5 to 95 % by weight of at least one monomer from the series consisting of acrylonitrile, methacrylonitrile, optionally substituted styrene, vinyl carboxylate and PA1 B) 5 to 95 % by weight of acrylic and/or methacrylic esters, the sum of components A)+B) being 100% by weight, in the presence of an aqueous solution or dispersion of an anionically modified polyurethane, preferably containing --SO.sub.3.sup.-Me.sup.+ and/or -COO.sup.- Me.sup.+ groups (Me.sup.+ =cation, preferably H.sup.+, Na.sup.+, K.sup.+, Li.sup.+, NH.sub.4.sup.+ or a substituted ammonium ion), and subjecting the resulting emulsion to a polymerization initiated by free radicals. The emulsion polymers produced are preferably used as surface sizing agents for paper.