Acrylic capstock

B - Operations – Transporting – 32 – B

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B32B 27/30 (2006.01)

Patent

CA 2588136

The invention concerns a multilayer structure comprising successively: a protecting layer (I) comprising a PMMA; optionally a pigmented layer (II); an intermediate ductile layer (III) comprising a sequenced polymer of formula BAn consisting of: a polymer sequence B including at least by weight 60 % of at least one (meth)acrylic monomer having a Tg lower than -5 °C, and n polymer sequences A, bound to the polymer sequence B through covalent bonds, n representing an integer between 1 and 10, comprising by weight less than 60 % of at least one (meth)acrylic monomer having a Tg higher than 0 °C; a structural plastic layer (III), the layers being arranged on one another in the sequence (I) to (IV) as indicated, and such that if the pigmented layer is not present, the total thickness of the layers (I) and (III) is more than 310 µm.

Structure multicouche comprenant dans l'ordre : ~ une couche protectrice (I) comprenant un PMMA, ~ éventuellement une couche pigmentée (II) , ~ une couche ductile intermédiaire (III) comprenant un copolymère séquencé de formule BAn composé : - d'une séquence polymère B comprenant en poids au moins 60% d'au moins un monomère (méth)acrylique ayant une Tg inférieure à -5~C, et - de n séquences polymère A, reliées à la séquence polymère B par des liaisons covalentes, n désignant un entier compris entre 1 et 10, comprenant en poids au moins 60% d'au moins un monomère (méth)acrylique ayant une Tg supérieure à 0~C, ~ une couche de plastique structural (III) , les couches étant disposées l'une sur l'autre dans l'ordre (I) à (IV) indiqué, et telle que si la couche pigmentée n'est pas présente, l'épaisseur totale des couches (I) et (III) est supérieure à 310 ~m.

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