Claims
- 1. A radiographic element comprised of
- a film support capable of transmitting radiation to which said radiographic element is responsive having opposed major faces,
- processing solution permeable hydrophilic colloid layers including, coated on each opposed major face, at least one silver halide emulsion layer capable of responding to electromagnetic radiation in the visible portion of spectrum and at least one other hydrophilic colloid layer interposed between said emulsion layer and said support,
- a dye dispersed in at least one of said interposed hydrophilic colloid layers capable of (i) absorbing visible radiation to which said radiographic element is responsive to reduce crossover and (ii) being decolorized in a processing solution,
- characterized in that
- said dye is prior to processing in the form of microcrystalline particles present in a concentration sufficient to reduce crossover to less than 10 percent and is capable of being substantially decolorized in less than 90 seconds during processing.
- 2. A radiographic element according to claim 1 further characterized in that said dye is initially present in a concentration sufficient to impart an optical density of at least 1.00 at the wavelength within the visible spectrum of peak emulsion sensitivity.
- 3. A radiographic element according to claim 2 further characterized in that said dye is a yellow dye.
- 4. A radiographic element according to claim 3 further characterized in that said dye exhibits an optical density of at least 1.00 over the spectral region of from 400 to 500 nm.
- 5. A radiographic element according to claim 2 further characterized in that said dye is a magenta dye.
- 6. A radiographic element according to claim 3 further characterized in that said dye exhibits an optical density of at least 1.00 over the spectral region of from 450 to 550 nm.
- 7. A radiographic element according to claim 1 further characterized in that said dye particles exhibit a mean diameter of less than 1 .mu.m.
- 8. A radiographic element according to claim 1 further characterized in that at least one of said interposed hydrophilic colloid layers contains an ultraviolet absorber.
- 9. A radiographic element according to claim 1 further characterized in that said dye when decolorized imparts a residual density to said radiographic element of less than 0.02.
- 10. A radiographic element comprised of
- a blue tinted transparent film support having opposed major faces,
- processing solution permeable hydrophilic colloid layers including, coated on each opposed major ace, at least one silver halide emulsion layer capable of responding to electromagnetic radiation in the visible portion of spectrum and at least one other hydrophilic colloid layer interposed between said emulsion layer and said support,
- a yellow or magenta dye dispersed in at least one of said interposed hydrophilic colloid layers coated on each said major faces capable of absorbing visible radiation to which said radiographic element is responsive to reduce crossover and capable of being decolorized in a processing solution,
- characterized in that
- said dye is prior to processing in the form of microcrystalline particles of less than 1 .mu.m in mean diameter present in a concentration sufficient to impart an optical density of at least 1.00 over a 100 nm spectral interval including the wavelength of peak silver halide emulsion sensitivity within the visible spectrum, thereby reducing crossover to less than 10 percent, and is capable of being substantially decolorized to a density of less than 0.01 in less than 90 seconds in a hydroquinone-phenidone.RTM. (1-phenyl-3-pyrazolidone) developer having a pH of at least 10.
RELATED COMMONLY ASSIGNED FILINGS
Diehl and Factor U.S. Ser. No. 945,634, filed Dec. 23, 1986, titled MICROCRYSTALLINE DYE DISPERSIONS FOR PHOTOGRAPHIC FILTER LAYERS now abandoned in favor of continuation-in-part application Ser. No. 104,486, filed Oct. 5, 1987, which was in turn abandoned in favor of continuation-in-part application Ser. No. 137,490, filed Dec. 23, 1987, claims novel dyes.
Factor and Diehl U.S. Ser. No. 73,257, filed July 13 1987, titled PHOTOGRAPHIC ELEMENTS HAVING OXONOL DYES claims a photographic element having thereon a layer comprising a dye.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
4092168 |
Lemahieu et al. |
May 1978 |
|
4172730 |
Minata et al. |
Oct 1979 |
|
4414304 |
Dickerson et al. |
Nov 1983 |
|
4425425 |
Abbott et al. |
Jan 1984 |
|
4425426 |
Abbott et al. |
Jan 1984 |
|
4500631 |
Sakamoto et al. |
Feb 1985 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
1414456 |
Nov 1975 |
GBX |
1426277 |
Feb 1976 |
GBX |
1477638 |
Jun 1977 |
GBX |
1477639 |
Jun 1977 |
GBX |
Non-Patent Literature Citations (4)
Entry |
Research Disclosure, vol. 184, Aug. 1979, Item 18431, Section V. |
Factor and Diehl U.S. Ser. No. 073,257, filed Jul. 13, 1987, titled Photographic Elements Having Oxonol Dyes. |
Diehl and Factor U.S. Ser. No. 945,634, filed Dec. 23, 1986, titled Microcrystalline Dye Dispersions for Photographic Filter Layers. |
Research Disclosure Jun. 1976, #1961, p. 59-60, "Improved X-Ray Sensitive Elements an Their Combination". |
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
137490 |
Dec 1987 |
|
Parent |
104468 |
Oct 1987 |
|