Ultrathin blown film with specific properties

A process for the manufacture of a layered structure S., wherein the layered structure S. comprises at least one first layer A. having a thickness in a range of from 3 to 50 μm, the process comprising at least the following steps

• P2. providing a granulate A. comprising a polymer (A),
• P3. providing a granulate B. comprising a polymer (B),
• P4. optionally, providing a granulate C. comprising a polymer (C),
• P5. heating granulate A. and granulate B. and/or optionally granulate C. to a temperature T which is at least 50° C., higher than the softening point or the glass transition temperature of the respective polymer (A), (B) and/or optionally (C) to receive the melts (A), (B) and optionally (C);
• P6. extruding the melt of at least melt (A) and melt (B) and/or optionally melt (C) in a blown film extrusion line to receive an extrudate of at least one layer A. from melt (A) with a thickness in a range of from 3 to 50 μm and a layer B. from melt (B) and/or optionally at least one layer C. from melt (C) to receive the layered structure S.;
• P7. cooling down the layered structure S. to a temperature in a range of from 10 to 50° C.;
• P8. optionally rolling the layered structure S. onto a roll;
• P9. optionally post processing the layered structure S., wherein the post processing is selected from the group consisting of printing onto at least one surface, forming, laser marking, and a combination of at least two thereof;
• P10. optionally delaminating layers A., B. or C. through an unwinding and rewinding process, or preferably inline delamination process,
• wherein polymer (A) is selected from the group consisting of a polycarbonate, a co-polycarbonate, a blend comprising a polycarbonate and a co-polycarbonate, a poly(methyl)methacrylate, a polyester, a co-polyester, and a mixture of at least two thereof.