High-washability aqueous polymer dispersion, preparation and...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 220/12 (2006.01) C08F 2/22 (2006.01) C09D 133/06 (2006.01)

Patent

CA 2458577

The invention concerns an aqueous polymer dispersion, prepared from a monomer composition comprising: (A) 50 to 99.99 parts by weight of at least an acrylic or methacrylic ester derived from acrylic or methacrylic acid and an alcohol having 1 to 12 carbon atoms; (B) 0 to 40 parts by weight of at least a vinylaromatic monomer; (C) 0 to 5 parts by weight of at least a short-chain .alpha.,.beta.- unsaturated mono- or polycarboxylic acid; (D) 0.01 to 5 parts by weight of at least an ethylenically unsaturated alpha-beta monomer compound (D), comprising at least a carbonyl group having at least a hydrogen atom borne in position alpha of said carbonyl (diacetone acrylamide), for 100 parts by weight of monomers (A) +(B) + (C) + (D), 80 to 98 wt. % of monomer components having been added to a reaction medium already containing a totally or partly polymerized pre-emulsion representing 2 to 20 wt. % of the final global proportion of monomer components in the dispersion finally obtained.

Dispersion aqueuse de polymère, préparée à partir d'une composition de monomères comprenant: (A) 50 à 99,99 parties en poids d'au moins un ester acrylique ou méthacrylique dérivé d'acide acrylique ou méthacrylique et d'un alcool ayant 1 à 12 atomes de carbone; (B) 0 à 40 parties en poids d'au moins un monomère vinylaromatique ; (C) 0 à 5 parties en poids d'au moins un acide mono- ou polycarboxylique .alpha., .beta.-insaturé à chaîne courte; et (D) 0,01 à 5 parties en poids d'au moins un composé (D) monomère alpha-bêta éthyléniquement insaturé, comportant au moins un groupement carbonyle ayant au moins un atome d'hydrogène porté par un atome de carbone en position alpha dudit carbonyle (diacétone acrylamide),pour 100 parties en poids des monomères (A) + (B) + (C) + (D), 80 à 98% en poids des composants monomères ayant été ajoutés à un milieu réactionnel contenant déjà une pré-émulsion totalement ou partiellement polymérisée représentant de 2 à 20 % en poids du taux global final des composants monomères dans la dispersion finalement obtenue.

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