Preparation of pulverulent polymers of acrylic and/or methacrylic acid and use thereof

US5084535A · kind A · utility

Assignee

• BASF SE

Inventors

• Karl Hennig · Heßheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Hans-Juergen Raubenheimer · Ketsch, DE
• Hermann Fischer · Augsburg, DE
• Walter Denzinger · Speyer, DE

Key dates

• Filing date: Nov 20, 1989
• Grant date: Jan 28, 1992
• Expiry date: Nov 20, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H19/58
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pulverulent polymers of acrylic acid and methacrylic acid are prepared by polymerizing (a) from 100 to 70% by weight of acrylic acid, methacrylic acid or a mixture thereof and (b) from 0 to 30% by weight of vinylsulfonic acid or an alkali metal salt thereof in a monohydric C.sub.1 -C.sub.8 -alcohol, water or a mixture thereof in a pulverulent bed in the presence of a polymerization initiator and from 0.05 to 10 mol % of thiocarboxylic acid and/or a mercaptoalcohol and from 0.05 to 10 mol % of propionic acid or formic acid as regulators, each percentage being based on the monomers used in the polymerization, by maintaining the pulverulent state during the polymerization, removing the heat of polymerization by distilling off the solvent and recirculating the reaction mixture.