Low-shrinkage polyester film and preparation thereof
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United States of America Patent
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Mar 3, 1992
Grant Date -
N/A
app pub date -
Jun 11, 1990
filing date -
Jun 13, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A biaxially oriented polyester film simultaneously satisfying the following formulas (I) to (III): .vertline.S.sub.180 -S.sub.120 .vertline..ltoreq.54 (I) T.sub.S.sup.MD .gtoreq.100 (II) Q.sub.120 .ltoreq.0.7 (III) wherein S.sub.180 is shrinking stress (g/mm.sup.2) of the film in the machine direction at 180.degree. C., S.sub.120 is shrinking stress (g/mm.sup.2) of the film in the machine direction at 120.degree. C., T.sub.S.sup.MD is shrinkage initiation temperature (.degree.C.) of the film in the machine direction, and Q.sub.120 is shrinkage (%) of the film in the machine direction after 5 hours' treatment at 120.degree. C., is described. The film has a good dimensional stability due to its low shrinkage, particularly in the machine direction, and substantially free from defect such as wave and wrinkle. It is prepared by biaxially stretching, heat-setting and relaxing an extruded polyester film under particular conditions so as to obtain a biaxially oriented polyester film having these characteristics.
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