MULTILAYER COMPOSITES HAVING IMPROVED PHYSICAL PROPERTIES

摘要

The invention relates to a multilayer composite body, comprising (i) a cover layer (1) having a layer thickness of 5-50 µm and comprising an acrylic polymer, (ii) an intermediate layer (2) arranged beneath the cover layer, which intermediate layer comprises a thermoplastic material that, at a layer thickness of 3 mm, exhibits a spectral transmission of at least 80% in the entire wavelength range from 380 nm to 780 nm, measured on undyed sample bodies according to ISO 13468-2, and has a glass transition temperature that, defined by the respective "midpoint temperature", measured by means of the DSC method according to ISO 11357-2 (1999-3 issue version), is at least 30°C higher with respect to the acrylic polymer of the covering layer (1), (iii) a substrate layer (3) comprising a thermoplastic material that has a glass transition temperature that, defined by the particular "midpoint temperature", measured by means of the DSC method according to ISO 11357-2 (1999-3 issue version) is at least 30°C higher with respect to the acrylic polymer of the covering layer (1) and containing pigments, dyes and optionally effect pigments, (iv) optionally a fourth layer (4) comprising a material as described in the intermediate layer (2) or the substrate layer (3), or a blend of acrylonitrile butadiene styrene copolymer (ABS) with a material as described in the intermediate layer (2) or the substrate layer (3), provided that the total thickness of the composite body is greater than 1.0 mm.