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US3753765A Expired / Lapsed US ⏱️ 0.0 years remaining

Conductive carbon antistatic backing for photographic film

Assignee: EIDP Inc
•
Filing: 1971-09-20
•
Granted: 1973-08-21
•
Expires: 1991-09-20
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Abstract

Abstract An opaque film element suitable for photographic inverse transfer elements comprising a dimensionally stable hydrophobic macromolecular organic film base containing a sufficient amount of a dispersed black pigment to provide an optical density of at least 8.0 and bearing on one surface a non-tacky anchoring layer of a vinylidene chloride/alkyl acrylate/itaconic acid terpolymer, said layer being coated with an antistatic composition comprising an aqueous dispersion containing a coalescible ternary copolymer of methyl methacrylate/ethyl acrylate/methacrylic acid, finely divided, highly conductive, carbon black and optionally, particles of a polyfluoroethylene resin, the resulting layer having a resistivity of <107 ohms per square. The opposite surface may have an anchoring layer as described above or may be otherwise treated to receive a colloid receptive layer for diffusion inverse transfer processes or a colloid-silver halide emulsion layer.

Inventors

  • 👤 Morgan J Gail
  • 👤 D Schumacher

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 16:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/7614; G03C8/00; G03C8/42; G03C8/52; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/266; Y10T428/27; Y10T428/273; Y10T428/31504; Y10T428/3154; Y10T428/31544

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 27 words
A film according to claim 1 wherein the polymer of which the film is made is a polyester and has an optical density of at least 8.
Claim 2
Dependent Claim 9 words
29 to 45 percent by weight of ethyl acrylate
Claim 3
Dependent Claim 32 words
about 5 percent by weight of methacrylic acid b. a coalescing amount of a coalescing agent and c. from 0.25 to 0.50 part by weight of carbon black per part of binder.
Claim 4
Dependent Claim 35 words
A film according to claim 2 having an anchor layer containing a copolymer comprised of at least 21 percent by weight of vinylidene chloride, said layer of antistatic composition being adhered to said anchor layer.
Claim 5
Dependent Claim 25 words
A film according to claim 3 wherein the copolymer of the anchor layer is comprised of at least 35 percent by weight of vinylidene chloride.
Claim 6
Dependent Claim 96 words
A film according to claim 4 wherein the copolymer of the anchor layer is a sequentially polymerized mixture of a. 90 to 60 percent by weight of a vinylidene chloride/-alkyl acrylate/itaconic acid terpolymer wherein the alkyl group contains one-four carbon atmos and wherein the components are present in respective amounts by weight of 35-96 percent, 3.5-64.5 percent and 0.5-25 percent and b. 10 to 40 percent by weight of a polymer of an alkyl acrylate or alkyl methacrylate wherein the alkyl group contains 1-10 carbon atoms, formed by addition polymerization in the presence of said terpolymer.
Claim 7
Dependent Claim 29 words
A film according to claim 5 wherein said layer of antistatic composition has a coating weight of 7-20 mg/dm2 and a resistivity of less than 107 ohms per square.
Claim 8
Dependent Claim 14 words
A film according to claim 6 wherein said coalescing agent is a glycol ether.
Claim 9
Dependent Claim 22 words
A film according to claim 7 wherein said glycol ether coalescing agent is ethylene glycol monoethyl ether or diethylene glycol monoethyl ether.
Claim 10
Dependent Claim 21 words
A film according to claim 8 wherein said terpolymer binder has a softening point of from 70* C. to 80* C.
Claim 11
Dependent Claim 31 words
A film according to claim 1 wherein said dispersion additionally contains up to 1 percent by weight, based on said terpolymer, of polyfluoroethylene resin particles selected from trifluoroethylene and tetrafluoroethylene polymers.

References Cited (Backward Citations)

US3052543A Cited
US3222178A Cited
US3437484A Cited
US3460945A Cited
US3443950A Cited
US3635855A Cited
US3607818A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-08-20 1977-02-19 1977-08-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-08-20 1981-02-19 1981-08-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-08-20 1985-02-19 1985-08-21 $7700.00 Window Closed / Lapsed

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