Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
1999-04-08
2001-06-19
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S600000, C430S607000, C430S613000, C430S614000, C430S615000
Reexamination Certificate
active
06248512
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a thermally processable photosensitive material, an image forming method and an antifoggant and in particular to a thermally processable photosensitive material, an image forming method and an antifoggant, leading to improved desensitization and raw stock stability as well as reduced fogging without deteriorating image storage stability.
BACKGROUND OF THE INVENTION
Thermally processable photosensitive materials forming photographic images with heat development are disclosed in D. Morgan and B. Shely, U.S. Pat. Nos. 3,152,904 and 3,457,075, and D. H. Klisterboer, “Thermally Processed Silver Systems” in Imaging processes and Materials Neblette's Eighth Edition, Edited by J. M. Sturge, V. Walworth and A. Shepp, page 279, 1989.
Such thermally processable materials comprise a reducible silver source (e.g., organic silver salts), a photocatalysts (e.g., silver halides) in a catalytically active amount, and a reducing agent, each of which is generally dispersed in a (an organic) binder matrix. The thermally processable photosensitive materials are stable at ordinary temperature, and after exposure, when they are heated to high temperatures (e.g., at least 80° C.), silver is formed through an oxidation-reduction reaction of the reducible silver source (working as an oxidizing agent) with a reducing agent. The oxidation-reduction reaction is accelerated with a catalytic action of a latent image produced upon exposure. Silver produced by the reaction of an organic silver salt in an exposed area provides a black image. This is in contrast to the unexposed area, and thereby forms an image. Antifoggants are optionally employed to minimize fog in the formed image.
The most effective method as the conventional fog restraining technique was a method in which mercury compounds were employed as antifoggants. Incorporation of mercury compounds as antifoggants in photosensitive materials is disclosed, for example, in U.S. Pat. No. 3,589,903. However, the mercury compounds are not environmentally desired and development of mercury-free antifoggants has been demanded.
U.S. Pat. No. 4,212,937 discloses a technique for reducing fogging and improving raw stock stability the of films by the use of an organic haloamide compound. Any organic haloamide compound which was applied to a laser-exposed and thermally processable photosensitive material, has not been known as yet. Recently, there have been broadly employed thermally processable photosensitive materials for use in medical laser imaging, which is used for infrared semiconductor laser exposure, and thermally processable photosensitive materials containing a contrast-increasing agent and used for outputting of printing image setter having oscillation wavelengths of 600 to 800 nm. When this compound is applied to a thermally processable photosensitive material suitable for laser exposure, it was proved that not only reduced fogging and improved raw stock stability were achieved but also surprisingly superior effects were unexpectedly obtained such that a fog-increase was effectively inhibited during storage of a processed photosensitive material sample.
JP-A Nos. 4-232939, 9-160164, 9-244178, 9-258367, 9-265150, 9-281640 and 9-319022 (herein, the term JP-A means a unexamined and published Japanese Patent Application) disclose a technique for reducing fogging and improving raw stock stability by use of a nitrogen containing heterocyclic compound having a bromine atom pair. Furthermore, JP-A 10-97026 discloses a technique for improving fogging by use of a quaternary polyhalogenated ammonium, a quaternary polyhalogenated phosphonium or a tertiary polyhalogenated sulfonium. However, these compounds were insufficient in improving effects, scarcely having effects in inhibiting a fog-increase during storage of processed samples.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a thermally processable photosensitive material, in processed sample of which a fog-increase during storage is restrained and an antifogging agent used therefor.
Another object of the invention is to a thermally processable photosensitive material employed in laser imaging for medical use, having high sensitivity, low fog and improved raw stock stability without producing fog during storage of a processed sample thereof; an image forming method by use thereof; and an antifogging agent used therefor.
Further, another object of the invention is to provide a thermally processable photosensitive material used as a film for outputting of an image-setter, having high contrast, high sensitivity, low fog and improved raw stock stability without producing fog during storage of a processed sample thereof; an image forming method by use thereof; and an antifogging agent used therefor.
The above objects of the present invention can be accomplished by the following constitution:
(1) an image forming method for a thermally processable photosensitive material, wherein the method comprises exposing a thermally processable photosensitive material to light by use of a laser light source, the thermally processable photosensitive material comprising a support having thereon an organic silver salt, a binder, a photosensitive silver halide and a compound containing a nitrogen atom which is covalently bonded to a halogen atom;
(2) the image forming method described in (1), wherein the halogen of the compound containing nitrogen covalently bonded to halogen is bromine;
(3) the image forming method described in (1), wherein the compound containing nitrogen covalently bonded to halogen is represented by following formula 1:
wherein G
1
and G
2
each represent a hydrogen atom or a substituent capable of being substituted onto a nitrogen atom, provided that G
1
and G
2
each may have a partial structure having a covalent bond between a nitrogen atom and a halogen atom, or G
1
and G
2
may combine with each other to form a ring; Hal is a halogen atom;
(4) the image forming method described in (3), wherein the compound represented by formula 1 is represented by the following formula 2:
wherein Z
1
represents an atomic group necessary to complete a 5- or 6-membered nitrogen-containing heterocyclic ring, along with two carbonyl carbon atoms and a nitrogen atom, which are adjacent with the other, provided that the atomic group represented by Z
1
may have a partial structure having a covalent bond between a nitrogen atom and a halogen atom; and Hal is a halogen atom;
(5) a thermally processable photosensitive material, wherein the photosensitive material comprises a support having thereon an organic silver salt, a binder, a photosensitive silver halide and a nitrogen containing compound, which is further associated with a pair of halogen atoms, provided that the nitrogen is not included in a ring;
(6) the thermally processable photosensitive material described in (5), wherein the pair of halogen atoms is a pair of bromine atoms;
(7) the thermally processable photosensitive material described in (5) or (6), wherein the nitrogen containing compound associated with a pair of halogen atoms, in which the nitrogen is not included in a ring, is represented by the following formula 3:
wherein Hal
1
and Hal
2
, which may be the same or different, represent a halogen atom; X
1
represents an acid residue; R
1
represents a group having a carboxy group as a partial structure; R
2
and R
3
each represents a hydrogen atom or a substituent except for halogen atoms, which is capable of being substituted onto a nitrogen atom, provided that R
1
to R
3
are not bonded with each other so as to form a ring in which the nitrogen atom is included; and n is 1 or 2;
(8) an antifogging agent, which is a nitrogen-containing compound associated with a pair of halogen atoms, in which the nitrogen is not included in the ring;
(9) the antifogging agent described in (8), wherein the pair of halogen atoms is a pair of bromine atoms;
(10) an antifogging agent described in (8), which is a nitrogen containing compound associated with a pair of halogen atom
Ishidai Keiko
Miura Norio
Bierman Jordan B.
Bierman, Muserlian and Lucas
Chea Thorl
Konica Corporation
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