Patent EP0182632A2 successfully refreshed from Google Patents.
EP0182632A2
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EP
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Light-polarizing film
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1985-11-15
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Granted: —
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Expires: 2005-11-15
Abstract
Abstract Highly durable, light-polarizing film having neutral gray as well as high polarizing coefficient is provided. The film comprises a uniaxially stretched base polymer film of, for example, polyvinyl alcohol or derivatives thereof and at least two dichroism dyes adsorbed and orientated therein. The dichcoism dyes are, for example, C.I. Direct Yellow 12, C.I. Direct Black 17 and C.I. Direct Blue 202. The film is usable fordisplay by liquid crystal.
Inventors
- 👤 Takuzo Okumura
- 👤 Toyokazu Okada
- 👤 Hitoshi Kikui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:25
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/20; G02B5/205; G02B5/22; G02B5/223; G02B5/3025; G02B5/3033; Y; Y10; Y10T; Y10T428/00; Y10T428/8305
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A light-polarizing film comprising an oriented polymer film and, as polarizing element, an adsorbed dichroism dye, characterised in that the light-polarizing film comprises at least two adsorbed dichroism dyes, said light-polarizing film having, over the visible light region of 400 - 700 nm, a polarizing coefficient of at least 70%, and a difference between the minimum and the maximum light transmittances of at most 20%.
Claim 2
Dependent Claim
41 words
A light-polarizing film according to Claim 1, wherein, over the visible light region of 400 - 700 nm, the difference between the minimum and the maximum polarizing coefficients is at most 20% and the minimum light transmittance is at least 20%.
Claim 3
Dependent Claim
75 words
A light-polarizing film according to Claim 1 or 2, wherein the dichroism dyes comprise at least one dye each from (A) yellow dichroism dyes having a major absorption wavelength region in the range of 400 - 500 nm, (B) black dichroism dyes having a major absorption wavelength region in the range of 450 - 650 nm, and (C) blue dichroism dyes having a major absorption wavelength region in the range of 570 - 700 nm.
Claim 4
Dependent Claim
95 words
A light-polarizing film according to Claim 1 or 2, wherein the dichroism dyes comprise at least one dye each from (A) yellow dichroism dyes having a major absorption wavelength region in the range of 400 - 500 nm, (B) black dichroism dyes having a major absorption wavelength region in the range of 450 - 650 nm, (C) blue dichroism dyes having a major absorption wavelength region in the range of 570 - 700 nm, and (D) orange or red dichroism dyes having a major absorption wavelength region in the range of 450 - 570 nm.
Claim 5
Dependent Claim
158 words
A light-polarizing film according to Claim 1 or 2, wherein the dichroism dyes comprise at least one each from (A) yellow dichroism dyes having a major absorption wavelength region in the range of 400 - 500 nm, (C) blue dichroism dyes having a major absorption wavelength region in the range of 570 - 700 nm, and (D) orange or red dichroism dyes having a major absorption wavelength region in the range of 450 - 570 nm. 6. A light-polarizing film according to Claim 1 or 2, wherein the dichroism dyes comprise at least one each from (C) blue dichroism dyes having a major absorption wavelength region in the range of 570 - 700 nm, (D) orange or red dichroism dyes having a major absorption wavelength region in the range of 450 - 570 nm, and (E) green dichroism dyes having a major absorption wavelength region in the range of 600 - 700 nm or 400 - 450 nm.
Claim 6
Dependent Claim
85 words
A light-polarizing film according to any one of the claims 3 to 6, wherein the dichroism dyes in the various classes (A) to (E), as and when present, are selected from: (A) C.I. Direct Yellow 12 C.I. Direct Yellow 44; (B) C.I. Direct Black 17 C.I. Direct Black 19; (C) C.I. Direct Blue 202 C.I. Direct Blue 1 (D) C.I. Direct Orange 26 C.I. Direct Orange 107 C.I. Direct Red 31 C.I. Direct Red 81 C.I. Direct Red 2; and (E) C.I. Direct Green 85
Claim 7
Dependent Claim
24 words
A light-polarizing film according to any one of the preceding claims, wherein the polymer film is made from polyvinyl alcohol or a derivative thereof.
Claim 8
Dependent Claim
35 words
A light-polarizing film according to any one of the preceding claims, wherein the polymer film has been uniaxially press-stretched under at least one pair of pressure rolls held at a temperature of 55 - 130°C.
Claim 9
Dependent Claim
30 words
A light-polarizing film according to any one of the preceding claims, which has been treated with aqueous boric acid solution held at a temperature of 50 - 80 o C.
References Cited (Backward Citations)
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