Biaxially oriented polypropylene-based multilayer film

A biaxially oriented polypropylene-based multilayer film comprising at least a core layer (CL), a first outer layer (OL1) and a second outer layer (OL2), wherein

• the first and the second outer layers (OL1) and (OL2) consist of a metallocene produced propylene-ethylene random copolymer having
• a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 in the range from 2 to 10 g/10 min;
• a melting temperature Tm as determined by DSC according to ISO 11357 in the range from 115 to 135° C.;
• and
• an ethylene content as measured by quantitative 13C {1H} NMR in the range from 2.0 to 5.0 wt % based on the weight of the propylene-ethylene random copolymer;
• a number of 2,1 and 3,1 regio defects as measured by 13C-NMR in the range from 0.10 to 1.0 mol %;
• wherein the core layer (CL) is a polypropylene-based polymer layer;
• and
• wherein the biaxially oriented polypropylene-based multilayer film has a sealing initiation temperature (SIT), determined as described in the experimental part on a BOPP film with a thickness of 25 μm, of 95° C. to 107° C.;
• a haze, measured on a BOPP film with a thickness of 25 μm according to ATSM D 1003-00, of between 0.5% to 1.5%;
• and exhibits a seal strength at 110° C. of at least 1.50 N/25 mm, and
• wherein the metallocene produced propylene-ethylene random copolymer is produced by a loop-gas phase sequential polymerization process using a metallocene catalyst.