Method of manufacturing an intrinsic polarizer
First Claim
1. A method for making a polarizer from a polymeric film having an original length and comprising a hydroxylated linear polymer, the method comprising:
- stretching the polymeric film a first stretching step;
converting the hydroxylated linear polymer, after the first stretching step, to form dichiroic, copolymer polyvinylene blocks aligned in the polymeric film; and
stretching the polymeric film in a second stretching step while converting the hydroxylated linear polymer.
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Abstract
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.
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Citations
30 Claims
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1. A method for making a polarizer from a polymeric film having an original length and comprising a hydroxylated linear polymer, the method comprising:
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stretching the polymeric film a first stretching step; converting the hydroxylated linear polymer, after the first stretching step, to form dichiroic, copolymer polyvinylene blocks aligned in the polymeric film; and stretching the polymeric film in a second stretching step while converting the hydroxylated linear polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification