Transparent supports for photographic products

• US 4,066,814 A
• Filed: 12/08/1975
• Issued: 01/03/1978
• Est. Priority Date: 04/24/1973
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Chiklis, Charles K.
• Primary Examiner(s): Kendall, Ralph S.
• Assistant Examiner(s): Hess, Bruce H.
• Application Number:
  US05/638,355
• Time in Patent Office: 757 Days
• Field of Search: 96/3, 96/29 D, 96/29 R, 96/50 PL, 96/67, 96/76 R, 96/76 C, 96/77, 96/84 R, 96/87 R, 96/119 R, 96/72, 428/421, 428/422, 428/483, 428/489, 428/332, 428/333, 428/336, 428/337, 428/339, 428/341, 428/423, 428/424, 428/480, 427/164, 427/385, 427/161, 427/162, 427/372, 427/384, 350/164
• US Class Current: 428/333
• CPC Class Codes: G03C 8/52 Bases or auxiliary layers; Substances therefor
• CPC Class Codes: Y10S 430/142 Dye mordant
• CPC Class Codes: Y10S 430/151 Matting or other surface reflectivity altering material
• CPC Class Codes: Y10S 430/162 Protective or antiabrasion layer
• CPC Class Codes: Y10T 428/261 In terms of molecular thickness or light wave length
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/273 of coating
• 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 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/3158 Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polyester film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface.

The polyester film base of the transparent element has an index of refraction of at least 1.6, and the anti-reflection coating comprises a fluorinated polymer and has an optical thickness of a quarter wave. An isocyanate in the anti-reflection coating or between said coating and the polyester film base increases the abrasion resistance of the fluorinated polymer anti-reflection coating.

Claims

1. A transparent element comprising a polyester film base having coated directly on at least one surface thereof an anti-reflection coating comprising a fluorinated polymer, said anti-reflection coating having an index of refraction of about 1.3 to 1.45 and a quarter wave optical thickness, the index of refraction of said anti-reflection coating being at least 0.2 less than that of said polyester film base, said element including an isocyanate in said coating or between said coating and said transparent polyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.

2. A transparent element as defined in claim 1 wherein said isocyanate is present in a quantity of about 1 to 2 mg./ft.².

3. A transparent element as defined in claim 1 wherein said isocyanate is a polyisocyanate.

4. A transparent element as defined in claim 1 wherein said quantity of said isocyanate is also effective to increase the adhesion of said fluorinated polymer coating to said polyester film base.

5. A transparent element as defined in claim 1 wherein said isocyanate is present in said quarter-wave coating in a concentration of about 1 to 2 mg./ft.².

6. A transparent element as defined in claim 1 wherein about 1 to 2 mg./ft.² of said isocyanate is coated between said support and said coating.

7. A transparent element as defined in claim 1 wherein said anti-reflection coating is present on one surface and the other surface of said polyester film base carries a subbing layer.

8. A transparent element as defined in claim 1 wherein said polyester is polyethylene terephthalate.

9. A transparent element as defined in claim 1 wherein each surface of said organic polymeric film base has coated directly thereon said anti-reflection coating.

10. A transparent element as defined in claim 1 wherein said polyester film base has a thickness of about 2 to 11 mils.

11. A transparent element as defined in claim 1 wherein said anti-reflection coating includes a vinylidene fluoride copolymer.

12. A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.

13. A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and tetrafluoroethylene.

14. A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and hexafluoropropylene.

15. A transparent element as defined in claim 1 wherein said anti-reflection coating includes polymethyl methacrylate.

16. A transparent element as defined in claim 1 wherein said anti-reflection coating has an optical thickness of about 0.08 to about 0.2 micron.

17. A transparent element as defined in claim 1 wherein said anti-reflection coating has a physical thickness of about 0.09 to about 0.11 micron.

39. A transparent element as defined in claim 1 wherein said isocyanate is methylene-bis-(4-phenylisocyanate).

40. A transparent element as defined in claim 1 wherein said isocyanate is present in said fluorinated polymer coating at a concentration of about 0.5 to 8 percent by weight of said polymer coating.

41. A transparent element as defined in claim 1 wherein said isocyanate is coated at a concentration of about 1 mg./ft.² between said polyester film base and said fluorinated polymer coating.

18. A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate, said element including an isocyanate in said coating or between said coating and said transparentpolyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.

19. A transparent element as defined in claim 18 wherein said polyethylene terephthalate includes a small quantity of a pigment effective to control light-piping by internal reflection of light incident upon an edge thereof.

20. A transparent element as defined in claim 19 wherein said optical thickness is about 1400 Angstroms.

21. A transparent element as defined in claim 18 wherein said isocyanate is present in a quantity of about 1 to 2 mg./ft.².

22. A transparent element as defined in claim 18 wherein said isocyanate is a polyisocyanate.

23. A transparent element as defined in claim 18 wherein said quantity of said isocyanate is also effective to increase the adhesion of said fluorinated polymer coating to said polyester film base.

24. A transparent element as defined in claim 18 wherein said isocyanate is present in said quarter-wave coating in a concentration of about 1 to 2 mg./ft.².

25. A transparent element comprising a polyethylene terephthalate film base, said film having an index of refraction of at least 1.6 and having coated directly on both surfaces thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate, said element including an isocyanate in said coating or between said coating and said transparent polyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.

26. The method which comprises coating directly on a polyester self-supporting film having an index of refraction of at least 1.6, a solution comprising an organic solvent and at least one fluorinated polymer dissolved therein at a coverage which will provide a fluorinated polymer layer having a quarter wave optical dry thickness, and drying said coating by evaporating said solvent at an elevated temperature, the index of refraction of said coating being about 1.3 to 1.45 and at least 0.2 less than that of said polyester film, said coating solution being applied at room temperature and including an isocyanate in a quantity effective to increase the abrasion resistance of said fluorinated polymer.

27. The method as defined in claim 26 wherein said polyester is polyethylene terephthalate.

28. The method as defined in claim 26 wherein said polyester film has a thickness of about 2 to 11 mils.

29. The method as defined in claim 26 wherein said coating solution includes a vinylidene fluoride copolymer.

30. The method as defined in claim 26 wherein said coating solution includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.

31. The method as defined in claim 26 wherein said coating solution includes a copolymer of vinylidene fluoride and tetrafluoroethylene.

32. The method as defined in claim 26 wherein said coating solution includes a copolymer of vinylidene fluoride and hexafluoropropylene.

33. The method as defined in claim 26 wherein said coating solution includes polymethyl methacrylate.

34. The method as defined in claim 26 wherein said isocyanate is a polyisocyanate.

35. The method as defined in claim 26 wherein said said isocyanate is provided by including in said coating solution a blocked isocyanate which releases said isocyanate at said elevated drying temperature.

36. The method as defined in claim 26 wherein said isocyanate is present in said coating solution in a concentration effective to provide a coverage of about 1 to 2 mg. per square foot.

37. The method as defined in claim 26 wherein said isocyanate is methylene-bis-(4-phenylisocyanate).

38. The method as defined in claim 35 wherein said blocked isocyanate is a p-chlorophenol derivative of methylene-bis-(4-phenylisocyanate).