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US4803014A Expired / Lapsed US ⏱️ 0.0 years remaining

Light-polarizing film

Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1986-02-25
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Granted: 1989-02-07
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Expires: 2006-02-25
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Abstract

Abstract PCT No. PCT/JP86/00091 Sec. 371 Date Sep. 8, 1986 Sec. 102(e) Date Sep. 8, 1986 PCT Filed Feb. 25, 1986 PCT Pub. No. WO86/04998 PCT Pub. Date Aug. 28, 1986.The present invention relates to a high-performance light-polarizing film assuming a neutral gray wherein are absorbed and oriented, in a polymer film, (A) iodine as a main polarizing coloring matter and additionally (B) a dichroism dye having a absorption characteristics and polarization characteristics in the low wavelength region of visible light and showing, when absorbed and oriented together with iodine in a polymer film, a direction of transition moment substantially identical with that of iodine and/or a dichroism dye having absorption characteristics and polarization characteristics in the high wavelength region of visible light and showing, when absorbed and oriented together with iodine in a polymer film, a direction of transition moment substantially identical with that of iodine. As compared with the prior iodine type light-polarizing films, the light-polarizing film obtained in the above-mentioned manner has a high light transmittance in the wavelength range of visible light, assumes a neutral gray and has a high polarizing co-efficient. Accordingly, it is effectively usable as a liquid crystal material for liquid crystal television and the like and effectively applicable to optical uses such as CRT filter and the like.

Inventors

  • 👤 Takuzo Okumura
  • 👤 Toyokazu Okada
  • 👤 Hitoshi Kikui

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 13:00
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 77 words
A light-polarizing film exhibiting a neutral gray produced by adsorbing and orienting the following (A) and (B) and/or (C) as dichroic coloring matter in a polymer film: (A) iodine, (B) a dichroic dye having absorption characteristics and polarization characteristics in the wavelength region of 400-500 nm in the wavelength range of visible light, (C) a dichroic dye having absorption characteristics and polarization characteristics in the wavelength region of 600-700 nm in the wavelength range of visible light.
Claim 2
Dependent Claim 77 words
A light-polarizing film exhibiting a neutral gray produced by adsorbing and orienting the following (A) and (B) and/or (C) as dichroic coloring matter in a polymer film: (A) iodine, (B) a dichroic dye having absorption characteristics and polarization characteristics in the wavelength region of 400-500 nm in the wavelength range of visible light, (C) a dichroic dye having absorption characteristics and polarization characteristics in the wavelength region of 600-700 nm in the wavelength range of visible light.
Claim 3
Dependent Claim 51 words
A light-polarizing film according to claim 1, wherein said dichroic dye (B) has a main absorption band in the wavelength region of 400 nm to 500 nm and exhibits a direction of transition moment substantially identical with that of iodine when adsorbed and oriented together with iodine into a polymer film.
Claim 4
Dependent Claim 18 words
A light-polarizing film according to claim 2, wherein a yellow colored dye is used as said dichroic dye.
Claim 5
Dependent Claim 19 words
A light-polarizing film according to claim 2, wherein C. I. Direct Yellow 12 is used as said dichroic dye.
Claim 6
Dependent Claim 51 words
A light-polarizing film according to claim 1, wherein said dichroic dye (C) has a main absorption band in the wavelength region of 600 nm to 700 nm and exhibits a direction of transition moment substantially identical with that of iodine when adsorbed and oriented together with iodine into a polymer film.
Claim 7
Dependent Claim 18 words
A light-polarizing film according to claim 5, wherein a blue colored dye is used as said dichroic dye.
Claim 8
Dependent Claim 19 words
A light-polarizing film according to claim 5, wherein C. I. Direct Blue 202 is used as said dichroic dye.
Claim 9
Dependent Claim 71 words
A light-polarizing film according to claim 1, wherein two or more kinds of dichroic dyes are used, at least one having a main absorption band in the wavelength region of 400 nm to 500 nm and at least one having a main absorption band in the wavelength of 600 to 700 nm, and each dye exhibits a direction of transition moment substantially identical with that of iodine into a polymer film.
Claim 10
Dependent Claim 21 words
A light-polarizing film according to claim 8, wherein a yellow-colored due and a blue-colored dye are used as said dichroic dyes.
Claim 11
Dependent Claim 25 words
A light-polarizing film according to claim 8, wherein C. I. Direct Yellow 12 and C. I. Direct Blue 202 are used as said dichroic dyes.
Claim 12
Dependent Claim 22 words
A light-polarizing film according to claim 1, wherein said polymer film is a film made of polyvinyl alcohol or a derivative thereof.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-02-07 1992-08-08 1993-02-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-02-07 1996-08-08 1997-02-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-02-07 2000-08-08 2001-02-07 $7700.00 Window Closed / Lapsed

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