Process for producing incompatible polymer-containing polyester film
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Aug 4, 1998
filing date -
Aug 4, 1997
priority date (Note) -
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Abstract
The present invention relates to a process for producing a polyester film containing a incompatible polymer, comprising: using a vented twin-screw extruder having a material feed port and vents in the cylinder, and melt-extruding a substantially undried polyester together with a polymer incompatible with said polyester, which melt-extruding is conducted under the condition that the content of said incompatible polymer is not less than 1 wt % based on the total output based on unit time (kg/hr), and the total output Q, extruder screw speed N (rpm) and cylinder bore D (mm) satisfy the following formula 2.6.times.10.sup.-6.times.D.sup.2.8.ltoreq.Q/N.ltoreq.15.8.times.10.sup. -6.times.D.sup.2.8.
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