Antistatic backing for photographic roll film
AssigneeIlford Limited
InventorsPeter J. Elton, John C. Clarke, John L. Cawse, George Littler, Andrew Wigglesworth, Peter J. Herring
Life of this patent
Estimating the term…
Abstract
There is provided a roll film assembly which comprises a length of photographic film having attached to each end thereof a length of backing paper, the film and the backing paper being wound together on a flanged spool, the backing paper being a laminate of paper and polyethylene which comprises as an opaqueing agent a layer of polyethylene which comprises from 7 to 10% by weight of carbon black particles of which from 20 to 100% by weight are conductive carbon particles.
Claims9
A method of preparing an antistatic roll film backing paper for photographic roll film, comprising:
- applying a polyethylene layer to a paper substrate;
- applying an opaquing layer to said polyethylene layer at a temperature sufficient to melt the polyethylene, said opaquing layer comprising polyethylene and from about 7 to 10% by weight of a mixture of conductive and non-conductive carbon black particles, said mixture containing from 20 to 80% by weight of conductive carbon black particles.
Dependencies are inferred from the claim text.