Method of making an extruded thin film, thin film so produced and its use

A method of making an extruded film comprising:

• melt filtering an amorphous thermoplastic composition comprising an amorphous thermoplastic polymer with a glass transition temperature Tg of 130° C. to 280° C., 150° C. to 250° C., or, 160° C. to 230° C., as determined by differential scanning calorimetry to form a melt filtered amorphous thermoplastic composition;
• extruding the melt filtered amorphous thermoplastic composition into strands at a temperature TE represented by the Equation A
• Tg+250≥TE≥Tg+100° C. (A);
• cooling the strands to a temperature TC represented by the Equation B
• Tg−30≥TC≥20° C. (B)
• to form cooled strands;
• cutting the cooled strands into pellets having a length of 2.0 to 6.0 millimeters or 3.0 to 5.0 millimeters;
• treating the pellets at a temperature TS represented by the Equation C
• Tg−10° C.≥TS≥20° C. (C)
• to remove particulates having at least one of length, width, and height of less than 0.5 millimeters to form treated pellets;
• melting the treated pellets in an extruder at a temperature Tp represented by Equation D
• Tg+250≥Tp≥Tg+100° C. (D);
• to form a molten composition;
• and
• extruding the molten composition through a flat die to form a film having an average thickness less than or equal to 50 micrometers.