High stability polarizer

• US 4,416,946 A
• Filed: 04/05/1982
• Issued: 11/22/1983
• Est. Priority Date: 04/05/1982
• Status: Expired due to Fees

• Current Assignee: Medical Devices, Inc.
• Original Assignee: American Hoechst Corporation (Sanofi )
• Inventors: Bolt, Lawrence
• Primary Examiner(s): Herbert, Jr., Thomas J.
• Application Number:
  US06/365,430
• Time in Patent Office: 596 Days
• Field of Search: 428/421, 428/1, 428/422, 428/500, 428/516, 350/397, 350/398, 264/1.3
• US Class Current: 428/421
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer

Abstract

The invention relates to a highly hydrolytically stable polarizer element having a moisture barrier flurocarbon film as its supporting substrate.

Claims

1. A polarizing element which comprises a sheet of a stained polyvinyl alcohol film which is adhered on one side thereof to a flexible transparent fluorine containing sheet, said fluorine containing sheet consisting essentially of a material selected from the group consisting of ethylene-chlorotrifluoroethylene, polytetrafluoroethylene, polyvinylidene fluoride, ethylene tetrafluoroethylene, perfluoro alkoxy materials, fluorinated ethylene propylene, and polychlorotrifluoroethylene.

2. The element of claim 1 further comprising a film of an additional flexible, transparent sheet material adherently disposed between said stained polyvinyl alcohol film and said fluorine containing sheet.

3. The element of claim 2 wherein said additional sheet material comprises polyester or cellulose acetate butyrate.

4. The element of claim 1 or 2 wherein said fluorine containing comprises polychlorotrifluoroethylene.

5. The element of claim 1 or 2 further comprising an additional flexible transparent fluorine containing sheet adhered to the opposite side of said polyvinyl alcohol film.

6. The element of claim 5 further comprising a second flexible transparent sheet material adherently disposed between said stained polyvinyl alcohol film and said additional flexible transparent fluorine containing sheet.