Process for producing a thermoplastic film using plastic bottle recyclate

A process for producing biaxially oriented single-layer or multilayer film comprising

• (i) extruding or coextruding a single crystallizable thermoplastic polymer and/or copolymer comprising a principal constituent, a secondary constituent and a third constituent;
• (ii) biaxially orienting the extrudate or co-extrudate;
• (iii) heat setting the biaxially oriented extrudate or co-extrudate,
• said process farther comprising mixing the principal constituent with up to less than 50% by weight, based on the total weight of the thermoplastic, of the secondary constituent, said mixing step performed prior to or during said extrusion or coextrusion step,
• wherein the principal constituent has a standard viscosity SV (DCA) of from 600 to 1000,
• the secondary constituent has a standard viscosity SV (DCA) of more than 900 to 1 500,
• the standard viscosity SV (DCA) of the secondary constituent is higher than that of the principal constituent by at least 100 units, and
• said third constituent is formed from recycled film, said third constituent having been subjected to an additional extrusion step during recycling, the amount of said second constituent determined via the formula:
• SCA=((SVVR+ΔR−SVTR)/(SVFL−SVTR))*100
• wherein, SCA=secondary constituent amount,
• SVVR=solution viscosity of primary constituent,
• ΔR=reduction in solution viscosity as a result of recycling extrusion,
• SVTR=solution viscosity of the third constituent prior
• to recycling and
• SVFL=solution viscosity of the secondary constituent.