Methacrylic composition for obtaining a coating having a...

C - Chemistry – Metallurgy – 08 – L

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C08L 33/12 (2006.01)

Patent

CA 2664250

The invention relates to a methacrylic composition consisting of (100-x-y) parts of at least one methacrylic polymer comprising a MAM homo- or copolymer containing dispersed therein: x parts of particles of a thermoplastic polymer A containing MAM as a majority monomer which is cross-linked or has a weight-averaged mass Mw > 300000 g/mol, preferably > 400000 g/mol (in relation to a PMMA standard), with a weight-averaged diameter (ASTM D1921) > 100 µm, preferably > 250 µm and < 500 µm, preferably < 400 µm; - and y parts of particles of a cross-linked thermoplastic polymer comprising MAM as a majority monomer, with a weight-averaged diameter (ASTM D1921) ranging from 15 to 70 µm; such that x varies between 2 and 20 and y varies between 10 and 25. Preferably, x+y < 33. The invention also relates to a multilayer structure consisting of: a layer (I) comprising the inventive methacrylic composition, a layer (II) comprising at least one thermoplastic polymer and an optional intermediate layer between layers (I) and (II).

L'invention est relative à une composition méthacrylique comprenant (100-x-y) parts d'au moins un polymère méthacrylique qui est un homo- ou copolymère du MAM dans lequel sont dispersées : - x parts de particules d'un polymère thermoplastique A comprenant le MAM comme monomère majoritaire qui est soit réticulé soit qui présente une masse moyenne en poids Mw > 300000 g/mol, avantageusement > 400000 g/mol (par rapport à un étalon PMMA), de diamètre moyen en poids (ASTM D1921 ) > 100 µm, avantageusement > 250 µm et < 500 µm, avantageusement < 400 µm; - y parts de particules d'un polymère thermoplastique réticulé comprenant le MAM comme monomère majoritaire, de diamètre moyen en poids (ASTM D1921 ) allant de 15 à 70 µm; telle que x varie de 2 à 20 et y varie de 10 à 25. De préférence, x+y < 33. L'invention est aussi relative à une structure multicouche comprenant : ~ une couche (I) comprenant la composition méthacrylique selon l'invention, ~ une couche (II) comprenant au moins un polymère thermoplastique, ainsi qu'une éventuelle couche intermédiaire disposée entre les couches (I) et (II).

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