Composition Coextrudable With Pvdf And Having No Stress Whitening Effect

Abstract: The present invention relates to composition coextrudable with PVDF and comprising: . 30 to 50 parts of PVDF; . 70 to 50 parts of a copolymer (A) comprising, by weight, 90 to 50% of methyl methccrylate (MMA) per 10 to 50% of an alkyl (meth)acrylate respectively, the alkyl having from 2 to 24 carbon atoms; . 1 to 4 parts of a UV absorber; . the total making 100 parts. The invention also relates to coextruded films consisting of: . a layer of the above coextrudable composition (also called adhesive layer) directly attached to the latter; and . a PVDF-based layer comprising, as main constituents , 50 to 100 parts of PVDF per 50 to 0 parts of PMMA respectively (this layer is also called for simplification ""PVDFlayer"). These films possess mechanical properties sufficient to allow them to be handled, to be processed and to be used as a coating transparent to visible light but opaque to UV radiation. The composition of the adhesive layer is based on the use of a polymethyl methacrylate copolymerized with a flexible acrylate making it possible to obtain a binding formulation exhibiting a compromise of properties between the transparency of the film, its good mechanical integrity and its ability not to whiten when it is subjected to a large deformation.

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