Plastisol with reduced water absorption

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 265/06 (2006.01)

Patent

CA 2566871

The invention relates to powder core/shell polymers for producing a plastisol exhibiting remarkably low water absorption. Said invention also relates to plastisol pastes which are made of said polymers and also exhibit low water absorption, a high storage stability, good mechanical properties and a good plasticiser compatibility. The core/shell polymers comprise latex particles whose primary particle size equal to or greater than 250 nm, wherein the core is made of methylmethacrylat, C2 to C8 (meth)acrylic esters or aromatic alcohol residues and optionally of other monomers and the shell(s) comprise, apart from components, (meth)acrylic acid amide and/or amine substituted (meth)acrylic acid alkylesters.

L'invention concerne des polymérisats du type noyau/enveloppe en poudre, pour la fabrication d'un plastisol présentant une absorption d'eau se révélant faible de façon surprenante. L'invention concerne en outre les pâtes de plastisol fabriquées à partir de ces polymérisats, lesquelles présentent également une faible absorption d'eau et, en outre, une bonne stabilité au stockage, de bonnes propriétés mécaniques et une bonne compatibilité aux plastifiants. Les polymérisats noyau/enveloppe comprennent des particules de latex ayant une granulométrie primaire d'au moins 250 nm, le noyau étant constitué par du méthacrylate de méthyle, des esters (méth)acryliques en C2 à C8 ou par des résidus d'alcools aromatiques et, éventuellement, d'autres monomères, et l'enveloppe / ou les enveloppes / renfermant, hormis ces composants, des amides de l'acide (méth)acrylique et/ou des alkylesters d'acide (méth)acrylique substitués par des amines.

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