COMPOSITION COEXTRUDABLE WITH PVDF, DOES NOT EXHIBIT WHITENING UNDER STRESS

摘要

The present invention relates to a composition coextrudable with PVDF and comprising: .cndot. 30 to 50 parts of PVDF, .cndot. 70 to 50 parts of a copolymer (A) comprising, by weight, 90 to 50% of methyl methacrylate (MMA) for respectively 10 to 50% of an alkyl (meth) acrylate, the alkyl having from 2 to 24 carbon atoms, .cndot. 1 to 4 parts of a UV absorber, .cndot. the total making 100 parts. The invention also relates to coextruded films consisting of .cndot. a layer of the above coextrudable composition (also called the adhesive layer) and directly attached thereto, .cndot. a PVDF-based layer comprising as main constituents from 50 to 100 parts of PVDF per 50 to 0 parts of PMMA (this layer is also called for simplification "PVDF layer"). These films have sufficient mechanical properties to allow ur manipulation, their implementation and their use 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 binder formulation having a compromise of properties between the transparency of the film, its good mechanical strength and its ability not to bleach when subjected to significant deformation.