An improved method of forming an intrinsic polarizer, referred to as a K-type polarizer, includes stretching a polymeric film a first stretching step. The polymeric film comprises a hydroxylated linear polymer which is converted after the first stretching step to form dichroic, copolymer polyvinylene blocks aligned in the polymeric film. The polymeric film is stretched in a second stretching step while converting the hydroxylated linear polymer. This method produces an improved K-type polarizer with excellent polarizing and color characteristics. For example, the dichroic ratio is higher than 100, the color shift for light passed through the polarizer in a crossed configuration is low, and the absorption of light in the blue region of the visible spectrum is more than one half of the absorption for light in the middle of the visible spectrum.

Title
Method of manufacturing an intrinsic polarizer
Application Number
12/314987
Publication Number
20090134535
Application Date
December 19, 2008
Publication Date
May 28, 2009
Inventor
Philip J Ralli
Sudbury
MA, US
Pradnya V Nagarkar
Newton
MA, US
Jonathan M Mack
Boylston
MA, US
Gerald N Nkwantah
Brockton
MA, US
Michael K Gerlach
Brookline
MA, US
Agent
Oliff & Berridge
VA, US
Assignee
Seiko Epson Corporation
IPC
B29D 11/00
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