C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/18 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29D 7/01 (2006.01) C08L 69/00 (2006.01) B29C 43/22 (2006.01) B29C 43/46 (2006.01)
Patent
CA 2449546
A method of preparing a thermoplastic polycarbonate film having an optical retardation value of less than or equal to 20 nm, is described. The method includes: (a) forming a molten extrudate (20) of a thermoplastic polycarbonate polymer in an extruder (11) having a terminal die (17) through which the molten extrudate is passed, the molten extrudate having a temperature of 150°C to 400°C upon emerging from terminal die (17); and (b) passing molten extrudate (20), from die (17), between two counter-rotating rolls (23 and 26) each having an elastomeric polymer surface (35 and 38), the counter-rotating rolls having a roll speed ratio and a nip (41), the distance between the terminal die (17) and the nip (41) being a die-nip distance (47). The extrudate temperature, the roll speed ratio and the die-nip distance (47) are each selected such that a thermoplastic polycarbonate film (32) having an optical retardation value of less than or equal to 20 nm is formed.
Colon Luis A.
Liu Shu
Bayer Materialscience Llc
Bayer Polymers Llc
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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