| abstract |
The invention relates to an orientated, especially biaxially orientated, sealable multilayer film vacuum-plated with aluminium, which is largely free of migrating additives and has the structure ABCD, in which a) C is the core layer, consisting of isotactic polypropylene with an MFI of between 0.5 and 4.5 g/10 minutes; b) is the base layer for vacuum-plating, consists of between 0.1 and 0.5 % of an organic or inorganic antisticking particle with good adhesion to aluminium and between 99.5 and 99.9 % of an olefinic homo-, co-, or terpolymer or a mixture of said olefinic polymers, and is subjected to corona discharge, plasma, flame or fluorine treatment prior to vacuum-plating; c) A is the vacuum-plated aluminium layer, which reduces light transmission by a factor of 1/50 to 1/500; and d) D is the sealable layer consisting of an olefinic homo-, co- or terpolymer and between 0.1 and 0.5 % of an inorganic or organic antisticking particle which is not as adherent to aluminium as the antisticking particle contained in layer B. |