Method for manufacturing polarizing film, polarizing film...

Details Method for manufacturing polarizing film, polarizing film... Method for manufacturing polarizing film, polarizing film...

2011-06-28

2011-06-28

Parker, Frederick J (Department: 1712)

Coating processes

With stretching or tensioning

C264S001340

Reexamination Certificate

active

07968143

ABSTRACT:
The present invention provides a method for manufacturing a polarizing film, by which, even when a wide raw film is used, it is possible to obtain a polarizing film that achieves excellent optical characteristics as well as uniformity in in-plane optical characteristics. The method includes the steps of dyeing a polymer film; stretching the dyed film; and drying the film that has undergone the dyeing and stretching steps while conveying the film with rolls. In the drying step, at least two rolls are used as the rolls and the film is dried under a condition that a ratio (R/W) of a distance (R) between the adjacent rolls to an initial width (W) of the polymer film is not less than 0.5 and not more than 4.0.

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International Search Report of PCT/JP2005/005823, date of mailing Jun. 14, 2005.

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