Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Patent
1995-06-05
1997-12-16
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
430536, 430537, 430627, 430642, 430950, G03C 132, G03C 195
Patent
active
056983859
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a silver halide photosensitive material having a silver halide emulsion layer and a protective layer disposed in this order on one surface of a support. More particularly, the invention relates to a silver halide photosensitive material containing a novel matting agent in the protective layer.
BACKGROUND ART
In conventional silver halide photosensitive materials, fine particles (matting agent) are incorporated into the protective layer to increase the surface roughness of the photosensitive materials, whereby the surfaces of the photosensitive materials are prevented from blocking when the photosensitive materials are contacted with each other or when they are contacted with processing apparatuses, and the antistatic properties or the vacuum contact properties in the contact exposure are improved.
As the matting agents, silica particles or plastic particles having particle diameters of about 1 to 10 .mu.m have been conventionally used.
In the vacuum contact exposure of a photosensitive material containing such matting agents, however, a considerably long period of time is required to completely contact the photosensitive material. In order to shorten the time required for the contact, it is effective to make the particle diameters of the matting agent larger so as to further increase the surface roughness of the photosensitive material. However, the matting agent of large-sized particles tends to sink during the coating process, the contact exposure process and the developing process. When producing a sensitive material by simultaneously forming a silver halide emulsion layer and a protective layer with using a multi-layer simultaneous coating apparatus, or when contact-exposing and developing the sensitive material, the above-mentioned sinking of the matting agent reaches up to the silver halide emulsion layer present below the protective layer. As a result, the thickness of the silver halide emulsion layer is thinned at the matting agent-sinking portions, and this causes occurrence of pin-holes or lowering of the maximum density (D max) in the measurement of optical density of a solid portion. Especially in the photosensitive material having a thin silver halide emulsion layer, occurrence of pin-holes and lowering of D max are serious. Moreover, a problem of too rough surface of the photosensitive material also resides in the use of such a matting agent of large-sized particles as mentioned above.
Further, inoranic matting agents which have been broadly used as the matting agents, such as silica, are not so good in the affinity for gelatin which is used as a binder for forming a protective layer. Therefore, such inorganic matting agents sometimes drop off from the protective layer when the photosensitive material is handled. The inorganic matting agents thus dropped might hurt the skin of workers or damage the instruments such as a cylinder, because they have high hardness.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a photosensitive material in which pin-holes hardly take place at the image portion.
It is another object of the invention to provide a photosensitive material which can shorten a vacuumizing time in the contact exposure process.
It is a further object of the invention to provide a photosensitive material which is almost free from powder-dropping and rarely has a bad influence on the worker's skin or the like.
The silver halide photosensitive material of the present invention is a silver halide photosensitive material comprising a support, at least one phtosensitive silver halide emulsion layer disposed on the support and a protective layer disposed on the photosensitive silver halide emulsion layer, in which the protective layer contains agglomerate particles, each of said agglomerate particles being formed from plural primary particles having a mean particle diameter smaller than the thickness of the protective layer.
In the silver halide photosensitive material of the invention, the agglomerate par
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Ishigaki Kunio
Kanetake Satoshi
Okada Yasuhiro
Ousaka Noriyuki
Fuji Photo Film Co. , Ltd.
Huff Mark F.
Soken Chemical & Engineering Co., Ltd.
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