Process for producing polarizing film, polarizing film,...

Details Process for producing polarizing film, polarizing film,... Process for producing polarizing film, polarizing film,...

2011-01-18

2011-01-18

Meeks, Timothy H (Department: 1715)

Coating processes

Optical element produced

Polarizer, windshield, optical fiber, projection screen, or...

Reexamination Certificate

active

07871665

ABSTRACT:
The present invention pertains to a method of fabricating a polarizing film by uniaxially stretching a resin film such as a polyvinyl alcohol-based film in a fabrication process including a swelling step and a dyeing step following the swelling step, comprising the steps of immersing a resin film in bath liquids in at least two or more swelling baths in sequence in the above-mentioned swelling step, wherein at least a bath temperature of a swelling bath located at a Nth position from the front-stage side is set at a temperature which is higher than a bath temperature of a swelling bath located at a (N+M)th position by 3° C. or more (both N and M are specified positive integers).

REFERENCES:
patent: 5071906 (1991-12-01), Tanaka et al.
patent: 2003/0137732 (2003-07-01), Sugino et al.
patent: 2005/0271873 (2005-12-01), Kameyama et al.
patent: 7-134210 (1995-05-01), None
patent: 2005-114990 (2005-04-01), None
patent: 2005-202386 (2005-07-01), None
patent: WO 2004/013667 (2004-02-01), None
patent: WO 2004/013667 (2004-02-01), None
International Search Report mailed Sep. 20, 2005 of International Application PCT/JP2005/013554.

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