Film extrusion composition and associated extruded film, metallized film, and capacitor

A film extrusion composition comprising, based on the total weight of the film extrusion composition:

• 50 to 99.35 weight percent of a copolycarbonate comprising, based on 100 mole percent total carbonate units in the copolycarbonate,
• 20 to 60 mole percent of first carbonate units having the structure
• wherein R1 is a C6-C16 divalent aromatic group;
• 40 to 80 mole percent of second carbonate units having the structure
• wherein R2 is a C17-C40 divalent aromatic group having the structure
• wherein Rf and Rg are each independently at each occurrence C1-C12 alkyl, C1-C12 alkoxyl, or C2-C12 alkenyl;
• each Rh is hydrogen or two occurrence of Rh combine with the carbon atom to which they are attached to form a carbonyl group;
• each occurrence of Ri is independently C1-C6 alkyl;
• Rj is hydrogen, C1-C6 alkyl, or phenyl optionally substituted with 1, 2, 3, 4, or 5 C1-C6 alkyl groups;
• Rk is independently at each occurrence C1-C3 alkyl or phenyl, preferably methyl;
• Xb is C6-C12 arylene, C4-C18 cycloalkylene, C4-C18 cycloalkylidene, or —C(Rm)(Rn)— wherein Rm is hydrogen, C1-C12 alkyl, or C6-C12 aryl, and Rn is C6-C10 alkyl, C6-C8 cycloalkyl, or C6-C12 aryl, or Xb is -(Qa)x-G-(Qb)y-, wherein Qa and Qb are each independently C1-C3 alkylene, G is C3-C10 cycloalkylene, x is zero or 1, and y is zero or 1;
• and j, m, and n are each independently zero, 1, 2, 3, or 4;
• and
• 0 mole percent of third carbonate units, each third carbonate unit comprising a divalent carbonate group and a divalent polysiloxane group, the divalent polysiloxane group comprising 5 to 60 diorganosiloxane units having the structure
• wherein each occurrence of R3 is independently a C1-C13 hydrocarbyl group;
• 0.1 to 6 weight percent of a slip agent selected from the group consisting of pentaerythritol tetrastearate, dipentaerythritol hexastearate, glycerol tristearate, high density polyethylenes, polymethylpentenes, poly(carbonate-siloxane) s, and combinations thereof;
• and
• 0.55 to 0.8 weight percent of a particulate crosslinked polymethylsilsesquioxane having a number-based mean equivalent spherical diameter of 0.5 to 4 micrometers determined by electrical sensing zone method according to ISO 13319-1:2021.