High-efficiency K-sheet polarizer
First Claim
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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Accused Products
Abstract
This invention relates to a new and improved light-polarizing sheet comprising molecularly oriented polyvinyl alcohol containing an oriented block segments of polyvinylene and said polyvinyl alcohol. In particular, the polarizing sheet comprises a polyvinylalcohol/polyvinylene block copolymer material wherein the polyvinylene blocks thereof are formed by molecular dehydration of a sheet of polyvinylalcohol; said sheet of polyvinylalcohol/polyvinylene block copolymer material comprising a 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 concentration of each of said polyvinylene blocks, as determined by the absorption of wavelengths ranging from 200 to 700 nm remaining relatively constant, 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; said polyvinylene block concentration and said degree of orientation of said molecules imparting to said sheet a photopic dichroic ratio, RD, of at least approximately 45.
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Citations
10 Claims
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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;
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for making a polarizer from a polymeric sheet having a predetermined original length and comprising a hydroxylated linear high polymer, the method comprising the steps of:
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(a) unidirectionally stretching the polymeric sheet from approximately 2.0 to approximately 5.0 times it original length; (b) exposing the stretched sheet to fuming acidic vapors; (c) heating the fumed oriented sheet at a temperature appropriate to effect dehydration of the fumed sheet and to thereby form light absorbing, vinylene block segments; and (d) unidirectionally extending the dehydrated, fumed, and oriented sheet an additional 10 to 160% such that the overall degree of stretch is at least 4.8 times that of the predetermined original length. - View Dependent Claims (8, 9, 10)
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Specification