Selective light transmittable film having excellent anti-fogging and infrared ray reflective properties

• US 4,828,345 A
• Filed: 07/09/1987
• Issued: 05/09/1989
• Est. Priority Date: 07/28/1986
• Status: Expired due to Term

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Nakatsuji, Yoshihiro, Kitamura, Shuji, Kotani, Kozo, Nakae, Kiyohiko
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Edmondson, David J.
• Application Number:
  US07/072,841
• Time in Patent Office: 670 Days
• Field of Search: 350/1.6, 350/1.7, 350/582, 427/393.4, 428/464
• US Class Current: 359/360
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/18 Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films G02B1/16 takes precedence
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: Y10T 428/31703 Next to cellulosic

Abstract

A selective light transmissible film or sheet having excellent anti-fogging properties, produced by forming a thin film of a metal and/or a metal compound having transparency and infrared ray reflective characteristics, on the surface of one side of a cellulose derivative film or sheet of which the surface of the other side is saponified with an alkaline aqueous solution, or on the surface of one side of a cellulose derivative film or sheet of which both surfaces are saponified with an alkaline aqueous solution.

Claims

1. A selective light transmissible film or sheet having excellent anti-fogging properties, produced by forming a thin film of a metal and/or a metal compound having transparency and infrared ray reflective characteristics, on the surface of one side of a cellulose derivative film or sheet of which the surface of the other side is saponified with an alkaline aqueous solution, or on the surface of one side of a cellulose derivative film or sheet of which both surfaces are saponified with an alkaline aqueous solution.

2. A selective light transmissible film or sheet as claimed in claim 1, wherein an agglutinant or a wet-type adhesive is coated on the surface on which the thin film of a metal and/or a metal compound has been formed and the surface is protected by a release backing film, and the surface of the other side is protected by a protective film.

3. A film or sheet as claimed in claim 1 or 2 wherein the cellulose derivative is selected from the group consisting of cellulose diacetate, cellulose triacetate, cellulose acetatebutyrate, cellulose propionate and a mixture of two or more of them.

4. A film or sheet as claimed in claim 1 or 2 wherein the thickness of the cellulose derivative film is 0.01 mm to 2 mm.

5. A film or sheet as claimed in claim 1 or 2 wherein the metal is selected from the group consisting of Al, An, Sn, Ni, Cr, Au, Ag, Pt, Cu, Ti, In and alloys of the same.

6. A film or sheet as claimed in claim 1 or 2 wherein the metal compound is selected from the group consisting of TiO₂, TiO, In₂ O₃, SiO₂, SiO, ZnS, CuO, CuO₂ Al₂ O₃ and mixtures of two or more of them.

7. A film or sheet as claimed in claim 1 or 2 wherein the thickness of the thin layer of the metal and/or metal compound is 50-1000 Å

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