Redispersible powder composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 27/06 (2006.01) C04B 24/24 (2006.01) C04B 24/26 (2006.01) C04B 28/02 (2006.01) C04B 40/00 (2006.01) C08L 29/04 (2006.01) C08L 31/00 (2006.01) C08L 31/02 (2006.01) C08L 33/06 (2006.01) C09D 127/06 (2006.01) C09J 127/06 (2006.01)

Patent

CA 2052173

The invention relates to a redispersible powder composition comprising a) a base polymer from the group comprising vinyl ester polymers, styrene polymers, acrylate polymers and vinyl chloride polymers, 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 Höppler viscosity of 2 to 25 mPa~s, c) 3 to 30% by weight, relative to the total weight of polymer components, of a fine antiblocking agent, d) 0.1 to 2% by weight, relative to the base polymer, of antifoams, which contains e) 1 to 8% by weight, relative to the base polymer, of a fully hydrolyzed 1-alkylvinyl ester/vinyl ester copolymer having a Höppler viscosity of 1 to 5 mPa~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.

Cette invention a trait à une composition poudreuse redispersable comprenant a) un polymère de base du groupe comprenant les polymères d'ester vinylique, les polymères de styrène, les polymères d'acrylate et les polymères de chlorure de vinyle, b) 2 à 15 % en poids, relativement au polymère de base, d'alcool polyvinylique ayant une degré d'hydrolyse de 85 à 94 mol% et une viscosité de Höppler de 2 à 25 mPa·s, c) 3 à 30 % en poids, relativement au poids total des composants polymériques, d'un agent antiadhérent fin, d) 0,1 à 2 % en poids, relativement au polymère de base, d'antimousses comprenant e) 1 à 8 % en poids, relativement au polymère de base, d'un copolymère ester 1-alkylvinylique/ester vinylique pleinement hydrolysé ayant une viscosité de Höppler de 1 à 5 mPa·s. Cette composition redispersable peut notamment être utilisée dans les composés de nivellement fluides qui prennent hydrauliquement. Elle peut aussi être utilisée dans les adhésifs de construction, les mortiers, comme additifs dans le gypse, et dans les plâtres et les peintures-émulsions.

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