Silver-halide-contg. photothermographic element for improved scanning
A heat sensitive element, silver halide technology, applied in the direction of photothermographic systems, electrical components, optics, etc.
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Examples
Embodiment 1
[0219] This example illustrates the preparation of blocked developer compound D-12 for use in the photothermographic elements of the present invention, which compound was prepared according to the following reaction scheme: Preparation of D-12:
[0220] A solution of diol 4 (15.0 g, 64 mmol), compound 3 (27.0 g, 130 mmol) and dibutyltin diacetate (0.05 mL) in 150 mL of tetrahydrofuran was stirred at room temperature for 18 hours. It was then filtered through a pad of Celite and the filtrate was concentrated in vacuo to give a solid recrystallized from methanol. The yield of D-12 was 25.0 g (40 mmol, 61%), and the melting point was 131°C.
Embodiment 2
[0222] This example illustrates a multilayer photothermographic element containing a 2.9 g / m imaging element according to the preferred range of the present invention. Silver halide emulsion:
[0223] The emulsions used in these examples were silver iodobromide tabular grains precipitated by conventional techniques known in the art. Table 2-1 below lists the various emulsions prepared, along with their iodide content (the remainder is assumed to be bromide), their size, and the sensitizing dye used to impart spectral sensitivity. All of these emulsions were chemically sensitized as known in the art to yield optimum photosensitivity.
[0224] emulsion
Silver iodide content (%)
Diameter (μm)
Thickness (μm)
dye
EY-3
yellow
2
1.23
0.125
SY-1
EY-4
yellow
2
0.45
0.061
SY-1
EY-5
yellow
2
0.653
0.093
SY-1
EM-3...
Embodiment 3
[0243] In order to provide images suitable for scanning, photothermographic films designed for scanning by conventional film scanning machines will develop a D of no greater than 2.0 in each color record min Density, D not greater than 4.0 max density, and D max -D min Density difference of at least 1.0. Preferable is D in one or more color records min Density 0.1-1.6, D in one or more color records max Less than 3.0 to provide an image suitable for scanning. More preferably the photothermographic element forms a blue density of 0.1-4.0, preferably 0.8-3.5, a green density of 0.1-4.0, preferably 0.4-3.0, and a red density of 0.1-3.2 and preferably 0.1-3.0.
[0244] Photographic samples A, B and C were prepared, image-wise exposed, developed and scanned with a high reflection scanner (Nikon2000) or a semi-slow shot scanner (Kodak Photo-CD scanner) to scan. Samples A and B have different silver contents but both contain masking couplers and D min Both adjust the dye an...
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Abstract
Description
Claims
Application Information
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