Manufacture of polarizing films

Details Manufacture of polarizing films Manufacture of polarizing films

1993-03-29

1994-07-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264 24, 264 78, 264108, 264185, 264204, 2642102, 2642884, 264291, B29C 5506

Patent

active

053265076

ABSTRACT:
The process for manufacturing a polarizing film based on polyvinyl alcohol and at least one dichroic substance by casting or extrusion of a mixture of polyvinyl alcohol and a solvent, whereby the polyvinyl alcohol contains the dichroic substance, drying and stretching of the film by between 300 and 1200%, whereby, depending on the width of the unstretched film b.sub.o, a stretch gap l.sub.o is provided, satisfying the condition b.sub.o /l.sub.o <3, leads to higher dichroic extinction quotients.

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