Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
1999-08-09
2001-01-30
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S506000, C430S530000, C430S510000, C430S934000
Reexamination Certificate
active
06180329
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a new photographic material that reduces the amount of dust generated when the material is conveyed. The invention also concerns the use of such material to reduce the amount of dust generated when the material is conveyed.
BACKGROUND OF THE INVENTION
Photographic material conventionally comprises a transparent reflective support that is coated with one or several image-forming layers containing silver halide photographic emulsions. From shooting to development, these materials are subject to many mechanical stresses. In particular, these mechanical stresses act on the photographic material when it is being moved, for example during exposure, development, printing or projection. Physical deterioration of the photographic material follows with partial shredding of the superficial layers of the photographic material. This partial shredding generates debris and dust which accumulate on the material itself, on any other photographic material in contact or located close by, and on the conveyor mechanism.
This problem is especially important in the cinematography industry. Motion picture films are photographic materials that are always used in movement, for example when shooting, developing, printing or projecting the film.
In cinematographic shooting, a set of scenes is filmed on a first color negative film for shooting. This negative film is cut and spliced to make up the final motion picture film that comprises a selection of scenes. This assembled negative film is then printed on positive color film, called a Master. This master, which constitutes the final motion picture film, is used to produce a copy onto intermediate negative film. This intermediate negative film is then used to print positive copies intended for projection in movie theater. These copies are obtained by exposing copy positive film using the intermediate negative film, the two films being placed one against the other and driven at speeds in the order of 50 to 100 m/min. This copying step is repeated as many times as necessary.
Consequently, a large number of copies are printed from a single intermediate negative film.
While these copies are being printed, dust and debris are generated by the wear and tear of the superficial parts of the copy positive film as they move. These dust and debris tend to accumulate mechanically or electrostatically on the intermediate film, which causes the appearance of defects on the following printed copies. In order to limit these defects, the copy printing operation has to be interrupted regularly to clean the intermediate negative film on which the dust and debris have accumulated.
The objective of the present invention is to provide copy positive photographic material that generates a low amount of dust and debris when printing copies.
SUMMARY OF THE INVENTION
The invention concerns photographic material comprising a support coated with a silver halide image-forming emulsion layer, and a protective layer with a hydrophilic colloid base, the material further comprising a non image-forming layer comprising metallic silver in particle form located between the protective layer and the set of image-forming layers.
The invention concerns a process for reducing the amount of dust generated by the photographic material when conveyed in drive mechanisms.
The invention further concerns a process for printing cinematographic copies that comprises exposing the material of the invention through a color negative film.
REFERENCES:
patent: 3650753 (1972-03-01), Bacon
patent: 5262288 (1993-11-01), Sakanoue et al.
patent: 5298369 (1994-03-01), Munshi et al.
patent: 5650265 (1997-07-01), Sniadoch et al.
patent: 5716768 (1998-02-01), Maruyama et al.
Baxter Janet
Eastman Kodak Company
Walke Amanda C.
Wells Doreen M.
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