Use of polyalkyl(meth)acrylate bead polymers and molding...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 33/12 (2006.01)

Patent

CA 2578717

The invention relates to the use of polyalkyl(meth)acrylate bead polymers with an average particle size V50 that ranges between 30 and 70 µm for improving the stress cracking resistance of moulding materials containing polyalkyl(meth)acrylate. The invention also relates to moulding materials comprising: a) at least 50 wt. % of an impact resistance modifying agent, which contains at least one polyalkyl(meth)acrylate phase; b) at least 8 wt. % of a polyalkyl(meth)acrylate bead polymer with an average particle size V50 that ranges between 30 and 70 µm; and c) between 0 and 42 wt. % of a polyalkyl(meth)acrylate with a molecular weight ranging between 20,000 and 350,000 g/mol, whereby the wt. % of the components a) to c) amounts to 100 wt. %, and to moulded bodies that can be obtained from said materials.

La présente invention concerne l'utilisation de polymères perlés de polyalkyl(méth)acrylate ayant une taille de particules moyenne V50 de 30 à 70 µm, pour améliorer la résistance à la fissuration sous contrainte, de matières à mouler contenant du polyalkyl(méth)acrylate. L'invention a également pour objet des matières à mouler contenant: a) au moins 50 % en poids d'agent de modification de résistance aux chocs, qui contient au moins une phase polyalkyl(méth)acrylate; b) au moins 8 % en poids de polymères perlés de polyalkyl(méth)acrylate ayant une taille de particules moyenne V50 de 30 à 70 µm; et c) 0 à 42 % en poids de polyalkyl(méth)acrylates ayant une masse molaire de 20000 à 350000 g/mol, les pourcentages en poids des composantes a) à c) s'additionnant pour donner 100 % en poids. L'invention a également pour objet des corps moulés réalisés à partir de ces matières à mouler.

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