US Patent 9994003 Multi-layer cast film

A multi-layer polymer film comprising a core layer and a sealing layer, said sealing layer comprises a propylene copolymer composition, said propylene copolymer composition—has a comonomer content in the range of 3.0 to 8.0 wt.-%, the comonomers are C5 to C12α-olefins, —comprises a polypropylene (A) and a polypropylene (B) in the weight ratio [(A)/(B)] of 20/80 to 80/20, wherein—said polypropylene (A) has a comonomer content of equal or below 4.0 wt.-%, the comonomers are C5 to C12α-olefins, and—said propylene copolymer (B) has a comonomer content of 4.0 to 20.0 wt.-%, the comonomers are C5 to C12α-olefins.