Sizing agents for paper and a process for the production thereof

US4381367A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wulf von Bonin · Leverkusen, DE
• Peter Mummenhoff · Cologne, DE
• Heinz Baumgen · Leverkusen, DE

Key dates

• Filing date: Dec 7, 1981
• Grant date: Apr 26, 1983
• Expiry date: Dec 7, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31906
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Paper sizing agents in the form of an aqueous preparation of maleic acid anhydride copolymers of which the anhydride groups had been reacted either with organic or inorganic bases or with primary-tertiary diamines and the reaction products subsequently reacted with epichlorohydrin or with inorganic or organic acids to form salts, the copolymers being made up of polymerised units of PA0 (a) from 5 to 75%, by weight, of an aromatic vinyl compound; PA0 (b) from 10 to 75%, by weight, of acrylic and/or methacrylic acid C.sub.1 -C.sub.18 alkyl esters; PA0 (c) from 5 to 35%, by weight, of maleic acid anhydride; PA0 (d) from 0 to 25%, by weight, of other vinyl monomers; and PA0 (e) from 0.1 to 10%, by weight, based on the sum of monomers (a) to (d) (which amounts to 100%, by weight), of an unsaturated aldehyde or of an enol ether derived therefrom. The copolymers are produced by radical polymerisation preferably in the absence of solvents.