Antistatic backing layer for unsubbed polyester film
AssigneeE. I. Du Pont de Nemours and Company
InventorConrad E. Miller
Life of this patent
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Abstract
Dimensionally stable energy-treated polyester film is coated with an opaque antistatic backing layer of carbon-filled polyacrylate containing an aziridine cross-linking agent.
Claims9
An article of manufacture consisting of a dimensionally stable energy-treated film base coated on one side with an opaque antistatic backing layer, characterized in that the backing layer is applied from an aqueous dispersion of a carbon-filled film-forming polyacrylate containing free carboxyl groups, in admixture with a polyfunctional aziridine cross-linking agent, followed by drying and thermal curing and a silver halide emulsion layer coated on the opposite side of the film base.
An energy-treated, biaxially oriented polyester film base having adhered to one side thereof a silver halide emulsion layer and having adhered to the opposite side thereof a layer of an opaque antistatic backing layer coated, post-stretch, from an aqueous dispersion comprising
- a. a terpolymer of the following composition
- 1. 50 to 66 percent by weight of methyl methacrylate,
- 2. 29 to 45 percent by weight of ethyl acrylate
- 3. about 5 percent by weight of methacrylic acid
- b. a polyfunctional aziridine
- c. from 0.25 to 0.50 parts by weight of carbon black per part of terpolymer.
An energy-treated polyethylene-clad paper support having adhered to one side thereof a silver halide emulsion layer and having adhered to the opposite side thereof a layer of an opaque antistatic backing layer coated from an aqueous dispersion comprising
- a. a terpolymer of the following composition
- 1. 50 to 66 percent by weight of methyl methacrylate,
- 2. 29 to 45 percent by weight of ethyl acrylate
- 3. about 5 percent by weight of methacrylic acid
- b. a polyfunctional aziridine
- c. from 0.25 to 0.50 parts by weight of carbon black per part of terpolymer.
A method of preparing a photographic film in which a silver halide emulsion layer is coated on a polyethylene terephthalate film base comprising:
- a. extruding the film base, stretching it in two directions and heat-setting,
- b. energy treating one side of the film base, and then coating it with an antistatic backing layer comprising a carbon-filled methyl methacrylate-ethyl acrylate-methacrylic acid copolymer and a polyfunctional aziridine,
- c. heating the coated film base for a time and at a temperature sufficient to bond the copolymer thereto, and
- d. coating the opposite side of the film base with a gelatino-silver halide emulsion.
Dependencies are inferred from the claim text.