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High-efficiency K-sheet polarizer

  • US 5,666,223 A
  • Filed: 12/01/1995
  • Issued: 09/09/1997
  • Est. Priority Date: 12/01/1995
  • Status: Expired due to Term
First Claim
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1. A light polarizer comprising a molecularly oriented sheet of polyvinylalcohol/polyvinylene block copolymer material having the polyvinylene blocks thereof formed by molecular dehydration of a sheet of polyvinylalcohol;

  • said molecularly oriented sheet of polyvinylalcohol/polyvinylene block copolymer material comprising a substantially uniform distribution of light-polarizing molecules of polyvinylalcohol/polyvinylene block copolymer material varying in the length, n, of the conjugated repeating vinylene unit of the polyvinylene block of the copolymer throughout the range of from 2 to 24;

    the degree of orientation of said light-polarizing molecules, as measured by the spectral dichroic ratio, RD, of said blocks, increasing throughout said range with increasing length, n, of said polyvinylene blocks;

    the concentration of each of said polyvinylene blocks, as determined by the absorption of wavelengths from 200 to 700 nm by said blocks, being such that said absorption-determined concentration of each of said polyvinylene blocks in the range of n=19 to 24 is not less than approximately 70% of the absorption-determined concentration of any of said polyvinylene blocks in the range of n=14 or 15;

    said light polarizer sheet exhibiting a photopic dichroic ratio, RD, of at least approximately 45.

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