Flexible multi-layered film having uv and visible light barrier layer for medical packaging

A heat-sterilizable multilayer film comprising:

• a) a first polymer layer (A),
• b) a second polymer layer (B), and
• c) a central polymer layer (C),
• wherein the central polymer layer (C) is situated between the first polymer layer (A) and the second polymer layer (B),
• wherein each of the three polymer layers (A), (B), and (C) comprises at least one aliphatic polyolefin,
• wherein the central polymer layer (C) comprises at least one UV absorber and at least one colorant from inorganic pigments selected from the group consisting of:
• a) iron oxides,
• b) zinc ferrite color pigments,
• c) iron-oxide-coated mica, and
• d) mixed-phase oxide pigments, wherein the combination of at least one UV absorber and at least one colorant absorbs radiation in the 175 nm to 525 nm wavelength range, and
• wherein:
• the first polymer layer (A) comprises at least one polypropylene homopolymer modified with at least one impact modifier,
• the second polymer layer (B) comprises at least one polypropylene terpolymer and/or polypropylene bipolymer modified with at least one impact modifier,
• the central polymer layer (C) comprises at least one polypropylene terpolymer modified with at least one impact modifier, and
• the central polymer layer has a mass fraction of 70% to 90% by weight of the total multilayer film.