Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
1997-03-05
2002-06-11
Dote, Janis L. (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
C430S270100, C430S920000, C430S921000, C430S944000
Reexamination Certificate
active
06403283
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image recording material which can be used as a planographic printing plate material. More particularly, the present invention relates to a planographic printing plate material which is usable for so-called direct plate making and which is capable of directly making a printing plate using infrared laser based on digital signals outputted from computer or the like.
2. Description of the Related Art
As systems of direct plate making from digital data of computer or the like, there have hitherto been proposed (1) system using an electrophotographic method, (2) system using photopolymerization wherein exposure is carried out using laser which emits blue or green light, (3) system by laminating a silver salt layer on a photosensitive resin, and (4) system by a silver salt diffusion transfer method and the like.
However, in a system using an electrophotographic method (1) above has complicated image formation processes such as charge, exposure, development and the like and, therefore, an apparatus therefor becomes sophisticated and large. In a system using photopolymerization (2) above, since the printing plate is highly sensitive to blue or green light, it becomes difficult to handle in an illuminated room. In methods (3) and (4), since a silver salt is used, those methods have a disadvantage that process such as development and the like becomes complicated and a waste solution naturally contains silver.
In recent years, laser technologies have been remarkably developed. In particular, high output and small-sized solid-state laser and semiconductor laser emitting infrared ray of wavelength from 760 nm to 1200 nm can be easily available. These lasers are very useful as a light source for recording when plate making is performed from digital data of computer and the like. However, since many of practically useful photosensitive recording materials are sensitive to visible light having wavelength of not greater than 760 nm, image recording can not be carried out with these infrared lasers. For this reason, there is a need for a material which is recordable with infrared laser.
One example of an image recording material which is recordable with infrared laser is a recording material described in Japanese Patent Application Laid-Open (JP-A) No. 7-20629, comprising an onium salt, a resol resin, a novolak resin and an infrared absorbing agent. Japanese Patent Application Laid-Open (JP-A) No. 7-271029 describes a recording material comprising s-triazine substituted with haloalkyl, a resol resin and a novolak resin, and an infrared light absorbing agent. However, these image recording materials have a problem that stain is produced on a non-image part when they are stored for a long period of time at an elevated temperature, followed by image formation and printing.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a negative working planographic printing plate with which plate making for printing can be performed from digital data of computer and the like by using solid-state laser or semiconductor laser emitting infrared ray, and which is excellent in storability, in particular, at an elevated temperature. This object and other objects as well as advantages of the present invention will become apparent with reference to the description below.
The present inventors gave attention to components of a negative working imaging recording material and studied them extensively. As a result, it has been found that the above objects can be attained by using a negative working image recording material comprising the following components (A) to (D), so that the present invention was completed.
The present invention relates to a negative working image recording material which comprises the following four components (A) to (D):
(A) at least one of compounds represented by following general formulas (I) to (V), or at least one of polymers obtained by radical polymerization using at least one of monomers represented by following general formulas (VI) to (X):
wherein R
1
, R
2
, R
4
and R
5
each represent a hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; R
3
represents a halogen atom, or a hydrocarbon group which has not more than 10 carbon atoms and which may be substituted, or an alkoxy group which has not more than 10 carbon atoms and which may be substituted; Ar
1
and Ar
2
each represent an aryl group which has not more than 20 carbon atoms and which may be substituted; R
6
represents a divalent hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; and n represents an integer of 0 to 4;
wherein R
7
represents a hydrogen atom, or a hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; R
8
represents a single bond, or a divalent hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; R
9
, R
11
and R
12
each represent a hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; Ar
3
and Ar
4
each represent an aryl group which has not more than 20 carbon atoms and which may be substituted; R
10
represents a halogen atom, or a hydrocarbon group which has not more than 10 carbon atoms and which may be substituted or an alkoxy group which has not more than 10 carbon atoms and which may be substituted; R
13
represents a divalent hydrocarbon group which has not more than 20 carbon atoms and which may be substituted; n represents an integer of 0 to 4; X represents a single bond, —CO—O— or —CO—NR
14
—; R
14
represents a hydrogen atom, or a hydrocarbon group which has not more than 20 carbon atoms and which may be substituted;
(B) at least one cross-linking agent;
(C) at least one infrared absorbing agent;
(D) at least one novolak resin.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is explained below in detail.
[Components (A) represented by the general formulas (I) to (V)]
In the above general formulas, R
1
, R
2
, R
4
and R
5
each may be the same or different and represent a hydrocarbon group which has not more than 20 carbon atoms and which may be substituted.
Examples of the hydrocarbon group are an alkyl group such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, t-butyl group, hexyl group, cyclohexyl group, octyl group, 2-ethylhexyl group, undecyl group, dodecyl group and the like; an alkenyl group such as allyl group, vinyl group, 1-methylvinyl group, 2-phenylvinyl group and the like; an aralkyl group such as benzyl group and the like; and an aryl group such as phenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, dodecylphenyl group, phenylphenyl group, naphthyl group and the like.
These hydrocarbon groups may have substituent(s) such as a halogen atom, an alkoxy group, a nitro group, a cyano group, a carboxy group and the like. Examples of the hydrocarbon group having the substituent(s) are trifluoromethyl group, chloroethyl group, 2-methoxyethyl group, fluorophenyl group, chlorophenyl group, bromophenyl group, iodophenyl group, methoxyphenyl group, phenoxyphenyl group, methoxyphenylvinyl group, nitrophenyl group, cyanophenyl group, carboxyphenyl group and the like.
R
3
represents a halogen atom, a hydrocarbon group, which has not more than 10 carbon atoms, and which may be substituted, (such as an alkyl group, an alkenyl group, an aralkyl group, an aryl group) or an alkoxy group which has not more than 10 carbon atoms.
More particularly, examples thereof are a halogen atom such as fluorine, chlorine, bromine and iodine; a hydrocarbon group such as methyl group, ethyl group, n-propyl group, i-propyl group, allyl group, n-butyl group, sec-butyl group, t-butyl group, hexyl group, cyclohexyl group, benzyl group, phenyl group, tolyl group and the like; a hydrocarbon group which has substituent(s), such as 2-methoxyethyl group, fluorophenyl group, chlorophenyl group, bromophenyl group, iodophenyl group, methoxyphenyl group a
Aoshima Keitaro
Kitatani Katsuji
Kobayashi Fumikazu
Dote Janis L.
Fuji Photo Film Co. , Ltd.
Sughrue & Mion, PLLC
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