Process for producing polarizing film

Details Process for producing polarizing film Process for producing polarizing film

2003-10-24

2009-12-15

Vargot, Mathieu D. (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

C264S002600, C264S002700, C264S288400, C264S343000

Reexamination Certificate

active

07632430

ABSTRACT:
The invention provides a continuous method for producing polarizing films that includes a step of monoaxially stretching a polyvinyl alcohol film having a width of at least 2 m in an aqueous boric acid solution, wherein the polyvinyl alcohol film is stretched on the condition that it satisfies the following formulae (1) and (2):in-line-formulae description="In-line Formulae" end="lead"?A≧5 (m)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?A/B≧0.5 (min) (2)in-line-formulae description="In-line Formulae" end="tail"?wherein A indicates the stretching distance (m); and B indicates the stretched film speed (m/min). The method gives wide polarizing films of wide and good polarization performance, and the polarizing films thus produced are useful as the material for polarizers that may be in large-size liquid-crystal displays.

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