Method for producing low birefringence plastic film
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United States of America Patent
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app pub date -
Jul 14, 2005
filing date -
Nov 27, 2001
priority date (Note) -
Abandoned
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Abstract
In one embodiment, the extrusion process can comprise: feeding a thermoplastic polycarbonate resin to an extruder; heating the resin to a temperature sufficient to attain a melt viscosity of less than or equal to about 300 Pa.s; extruding the heated resin; and passing the extruded resin through a gap between two solid metal calendering rolls to produce a film. The film has a birefringence of less than or equal to about 50 nm.
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