US4047804A
Expired / Lapsed
US
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Anti-reflection coatings for photographic bases
Assignee: Polaroid Corp
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Filing: 1974-11-29
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Granted: 1977-09-13
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Expires: 1994-11-29
Abstract
Abstract Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polymeric film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. Such transparent supports are particularly useful in photographic products wherein the final image is formed by multicolor diffusion transfer processes using dye developers or other image dye-providing materials. In the preferred embodiments, the photographic image is an integral negative-positive reflection print. Where photoexposure is effected through a transparent support, e.g., the transparent support through which the final image is viewed, provision of an anti-reflection coating on said support and effecting photo-exposure therethrough will permit more effective recording of light passing through the camera lens. The polymeric 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. More uniform anti-reflection coatings are obtained by including a polydimethyl siloxane in the fluorinated polymer coating solution.
Inventors
- 👤 Robert K. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/7614; G03C1/825; G03C8/00; G03C8/42; G03C8/52; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/26; Y10T428/261; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
93 words
A transparent element comprising a polymeric film base having an index of refraction of at least 1.6, said polymeric film base carrying on one surface thereof a quarter-wave anti-reflection coating having an index of refraction at least about 0.20 less than said polymeric film base and an optical thickness of about 0.08 to about 0.2 micron, said anti-reflection coating comprising a fluorinated polymer and a polydimethyl siloxane in a quantity approximately 0.2 to 4 percent by weight of said anti-reflection coating, said polydimethyl siloxane having a viscosity of about 10,000 to 100,000 centistokes.
Claim 2
Dependent Claim
93 words
A transparent element comprising a polymeric film base having an index of refraction of at least 1.6, said polymeric film base carrying on one surface thereof a quarter-wave anti-reflection coating having an index of refraction at least about 0.20 less than said polymeric film base and an optical thickness of about 0.08 to about 0.2 micron, said anti-reflection coating comprising a fluorinated polymer and a polydimethyl siloxane in a quantity approximately 0.2 to 4 percent by weight of said anti-reflection coating, said polydimethyl siloxane having a viscosity of about 10,000 to 100,000 centistokes.
Claim 3
Dependent Claim
16 words
A transparent element as defined in claim 1 wherein said optical thickness is about 1400 Angstroms.
Claim 4
Dependent Claim
21 words
A transparent element as defined in claim 1 wherein the other surface of said polymeric film base carries a subbing layer.
Claim 5
Dependent Claim
16 words
A transparent element as defined in claim 1 wherein said polymeric film base is a polyester.
Claim 6
Dependent Claim
14 words
A transparent element as defined in claim 4 wherein said polyester is polyethylene terephthalate.
Claim 7
Dependent Claim
22 words
A transparent element as defined in claim 1 wherein said anti-reflection coating has an index of refraction of about 1.3 to 1.45.
Claim 8
Dependent Claim
22 words
A transparent element as defined in claim 1 wherein said polymeric film base has a thickness of about 2 to 11 mils.
Claim 9
Dependent Claim
17 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a vinylidene fluoride copolymer.
Claim 10
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.
Claim 11
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and tetrafluoroethylene.
Claim 12
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and hexafluoropropylene.
Claim 13
Dependent Claim
15 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes polymethyl methacrylate.
Claim 14
Dependent Claim
23 words
A transparent element as defined in claim 1 wherein said anti-reflection coating has a physical thickness of about 0.9 to about 0.11 micron.
Claim 15
Dependent Claim
32 words
A transparent element as defined in claim 1 wherein said polydimethyl siloxane is present in said anti-reflection coating in a quantity approximately 0.5 to 3 percent by weight of said anti-reflection coating.
Claim 16
Dependent Claim
22 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes finely divided silica less than 100 mμ in diameter.
Claim 17
Dependent Claim
100 words
A transparent element comprising a polyethylene terephthalate film base, said film base carrying on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride and including a polydimethyl siloxane, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.9 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 film base, said polydimethyl siloxane having a viscosity of about 10,000 to 100,000 centistokes and being present in a quantity approximately 0.2 to 4 percent by weight of said anti-reflection coating.
Claim 18
Dependent Claim
100 words
A transparent element comprising a polyethylene terephthalate film base, said film base carrying on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride and including a polydimethyl siloxane, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.9 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 film base, said polydimethyl siloxane having a viscosity of about 10,000 to 100,000 centistokes and being present in a quantity approximately 0.2 to 4 percent by weight of said anti-reflection coating.
Claim 19
Dependent Claim
34 words
A transparent element as defined in claim 16 where said polyethylene terephthalate includes a small quantity of a pigment effective to control light-piping by internal reflection of light within said polyethylene terephthalate film base.
Claim 20
Dependent Claim
16 words
A transparent element as defined in claim 16 wherein said optical thickness is about 1400 Angstroms.
Claim 21
Dependent Claim
33 words
A transparent element as defined in claim 16 wherein said polydimethyl siloxane is present in said anti-reflection coating in a concentration of approximately 0.5 to 3 percent by weight of said anti-reflection coating.
Claim 22
Dependent Claim
22 words
A transparent element as defined in claim 16 wherein said anti-reflection coating includes finely divided silica less than 100 mμ in diameter.
Claim 23
Dependent Claim
20 words
A transparent element as defined in claim 16 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.
Claim 24
Dependent Claim
20 words
A transparent element as defined in claim 16 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and tetrafluoroethylene.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |