Production of iodine stainable polyester polarizer film
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United States of America Patent
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Apr 21, 1987
Grant Date -
N/A
app pub date -
Nov 30, 1984
filing date -
Nov 30, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for preparing an iodine stainable polyester polarizer film which comprises: (a) extruding a moving molten web of polyester film; and (b) quenching said moving web to solidify it in a substantially amorphous form; and (c) applying an anchor coating to at least a portion of the surface of said film wherein said anchor coating improves adhesion of polyvinyl alcohol to polyester film; and (d) applying a coating of a dispersed aqueous composition of polyvinyl alcohol to at least a portion of the surface of said film; and (e) stretching said moving web in a direction transverse to the direction of motion while heating said web at a temperature of from about its glass transition temperature to about 160.degree. C.; and (f) crystallizing said moving web by heating it to a temperature in the range of 130.degree. C. to 240.degree. C. without stretching said web; and (g) cooling said web to substantially ambient atmospheric temperature.
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