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Lithographic printing plate precursor

一种印版前体、平版的技术，应用在负片型或正片型平版印版前体领域，能够解决感光层亲合力不总是优异、非图像区域污染、损害等问题

Inactive Publication Date: 2007-08-29
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, various treatments for improving hydrophilicity are not always excellent in affinity to the photosensitive layer
There is also a problem that in some cases, the adhesion between the support and the photosensitive layer formed thereon is impaired so that the photosensitive layer is peeled off under severe printing conditions and sufficient printing durability cannot be obtained
[0008] However, in the non-image area, the photosensitive layer cannot be completely removed at the time of development, and the layer remains on the support surface, thereby causing a problem that ink adheres to the remaining layer causing contamination in the non-image area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] step 1:

[0179] In a 200 ml reaction vessel equipped with a reflux condenser, a thermometer, a dropping device and a stirrer, 25.0 g of maleic anhydride copolymer GS-601 (Gifu Shellac Mfg., Co., Ltd.: monomer ratio, Maleic anhydride / styrene=40 / 60, Mwt=5,500) and 75.0 g of dimethylacetamide. After heating to 80°C, a solution mixture of 10.0 g of N,N-dimethylaminopropylamine and 15.0 g of dimethylacetamide was added to the reaction vessel. After completion of the dropwise addition, the internal temperature was kept at 80° C. for 30 minutes to obtain a maleamic acid copolymer. After the reaction was complete, a small sample was collected and checked for solubility in ethyl acetate or water. As a result, the maleamic acid copolymer was insoluble in neither ethyl acetate nor water.

[0180] Step 2:

[0181] After completing the reaction of Step 1, the reaction mixture was heated and a solution mixture of 12.0 g of bromopropane and 15.0 g of dimethylacetamide was added d...

Embodiment 2-19

[0185] In the same manner as in Synthesis Example 1, N-substituted maleamic acid copolymers in which hydrogen atoms on nitrogen atoms were substituted with  groups were obtained from various maleic anhydride copolymers. The results are shown in Table 1.

[0186] Table 1: Synthesis examples of maleamic acid copolymers in which hydrogen atoms on nitrogen atoms are replaced by  groups

[0187] Maleic anhydride copolymer

N-substituted maleamic acid copolymer

Maan

Stylized

αMSty

AN

Mwt

Yield (%)

Solubility

Synthesis Example 2

RV-89

25

75

6000

86

WS

Synthesis Example 3

RV-11

20

80

8000

70

WS / WD

Synthesis Example 4

RV-12

20

40

40

6000

68

WD

Synthesis Example 5

RV-13

20

50

30

8000

72

WS

Synthesis Example 6

RV-14

20

...

Embodiment 20

[0198] In a 200ml flask equipped with reflux condenser, thermometer, dropping device, stirrer and gas inlet, introduce 3.75g maleic anhydride monomer, 13.75g styrene monomer, 7.5g acrylonitrile monomer and 75.0g dimethyl acetamide. After bubbling nitrogen for one hour and heating to 80° C., 0.2 g of 2,2′-azobisisobutyronitrile (AIBN) were added. The reaction was carried out for 3 hours while adding 0.2 g of AIBN every 30 minutes. After completing the reaction, the reaction mixture was cooled and the viscosity of the reaction mixture was measured. As a result, it was VIS A (Gardener viscosity indicator: 25°C). The reaction mixture was soluble in ethyl acetate but insoluble in water.

[0199] While maintaining at 80°C without taking the reaction mixture out of the vessel, a solution mixture of 3.75 g of N,N-dimethylaminopropylamine and 15.0 g of dimethylacetamide was added dropwise. After the dropwise addition was completed, the reaction was continued at 80° C. for 30 minute...

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Abstract

To provide a lithographic printing plate precursor which generates no stains in the non-image area and is also excellent in development latitude. Disclosed is a lithographic printing plate precursor comprising a support and a photosensitive layer, said lithographic printing plate precursor further comprising a subbing layer containing a maleamic acid (co)polymer, in which at least one hydrogen atom on a nitrogen atom is substituted with an onium group, provided between the photosensitive layer and the support.

Description

[technical field] [0001] The present invention relates to lithographic printing plate precursors, and more particularly to negative-working or positive-working lithographic printing plate precursors which have a wide development latitude and which also do not produce smearing in non-image areas. [Background technique] [0002] With the development of computer image processing technology, a method of writing an image directly on a photosensitive layer by optical radiation in response to a digital signal has recently been developed, and thus shows strong interest in a computer-to-plate (CTP) system. Interestingly, in this system by adopting the method in the lithographic printing plate precursor, the images are formed directly on the photosensitive lithographic printing plate without outputting them to the silver salt mask film. The CTP system uses a high-output laser with maximum intensity in the near-infrared or infrared range as a light source for optical radiation, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/11B41C1/10
CPCG03F7/11B41C1/10
Inventor Y·科吉马
Owner EASTMAN KODAK CO
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