Redispersible powder composition

US5118751A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Joachim Schulze · Soest, DE
• Hardy Herold · Burghausen, DE
• Juergen Hinterwinkler · Burghausen, DE

Key dates

• Filing date: Aug 23, 1991
• Grant date: Jun 2, 1992
• Expiry date: Aug 23, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a redispersible powder composition comprising PA0 a) a base polymer from the group comprising vinyl ester polymers, styrene polymers, acrylate polymers and vinyl chloride polymers, PA0 b) 2 to 15% by weight, relative to the base polymer, of polyvinyl alcohol having a degree of hydrolysis of 85 to 94 mol % and a Hoppler viscosity of 2 to 25 mPa.multidot.s, PA0 c) 3 to 30% by weight, relative to the total weight of polymer components, of a fine antiblocking agent, PA0 d) 0.1 to 2% by weight, relative to the base polymer, of antifoams, which contains PA0 e) 1 to 8% by weight, relative to the base polymer, of a fully hydrolyzed 1-alkylvinyl ester/vinyl ester copolymer having a Hoppler viscosity of 1 to 5 mPa.multidot.s. The redispersible composition according to the invention is suitable in particular for use in flowing, hydraulically setting leveling compounds. Further areas of application for the redispersible powder composition according to the invention are its use in building adhesives, mortars, as an additive to gypsum, and in plasters and emulsion paints.