Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for the production of lithographic printing plates

A technology of lithography and printing plates, which is applied in the direction of photographic plate-making process, optics, instruments, etc. on the pattern surface, and can solve the problems of lithographic printing plate dot sharpening, etc.

Inactive Publication Date: 2012-06-13
KODAK POLYCHROME GRAPHICS
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that these solutions lead to strong dot sharpening of lithographic printing plates

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for the production of lithographic printing plates
  • Process for the production of lithographic printing plates
  • Process for the production of lithographic printing plates

Examples

Experimental program
Comparison scheme
Effect test

example

[0367] Examples include:

[0368] 2,2'-bis(bromophenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0369] 2,2'-bis(p-carboxyphenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0370] 2,2'-bis(o-chlorophenyl)-4,4',5,5'-tetrakis(p-methoxyphenyl)-biimidazole,

[0371] 2,2'-bis(p-chlorophenyl)-4,4',5,5'-tetrakis(p-methoxyphenyl)-biimidazole,

[0372] 2,2'-bis(p-cyanophenyl)-4,4',5,5'-tetrakis(p-methoxyphenyl)-biimidazole,

[0373] 2,2'-bis(2,4-dichlorophenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0374] 2,2'-bis(2,4-dimethoxyphenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0375] 2,2'-bis(o-ethoxyphenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0376] 2,2'-bis(m-fluorophenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0377] 2,2'-bis(o-fluorophenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0378] 2,2'-bis(p-fluorophenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0379] 2,2'-bis(o-hexyloxyphenyl)-4,4',5,5'-tetraphenylbiimidazole,

[0380] 2,2'-bis(o-hexylphenyl)-4,4',5,5'-tetrakis(p-methoxyphenyl)-biimidazole,

[03...

Embodiment 1-6 and comparative example 1-12

[0569] Electrochemically grained (with HCl) and anodized aluminum foil (average roughness 0.55 μm; aluminum oxide layer 3.2 g / m 2 ) were treated with an aqueous solution of polyvinylphosphonic acid (PVPA), dried, coated with the filtered solution as described in Tables 1-5, and dried.

[0570] Table 1:

[0571]

[0572] Table 2:

[0573] 0.22g Copolymer comprising 80 mol% allyl methacrylate and 20 mol% methacrylic acid, having an acid value of 95 mg KOH / 1 g 0.1g Kayamer PM-2 (1 mol phosphoric acid esterified with 1.5 mol hydroxyethyl methacrylate from Coa Corp. Ltd., Japan) 0.31g Mercapto-1,2,4-triazole 2.3g Dispersion of 21.1 wt% copper phthalocyanine and 2.1 wt% polyvinyl acetal containing 39.9 mol% vinyl alcohol groups, 1.2 mol% vinyl acetate in propylene glycol monomethyl ether as a binder group, 15.4 mol% of acetal groups derived from acetaldehyde, 36.1 mol% of acetal groups derived from butyraldehyde and 7.4 mol% of acetal groups...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
mean roughnessaaaaaaaaaa
Login to View More

Abstract

Process for the production of lithographic printing plates comprises (a) providing a lithographic substrate with a hydrophilic surface; (b) applying a negative working radiation-sensitive composition onto the hydrophilic surface, wherein the composition comprises: (i) one or more types of monomers and / or oligomers and / or polymers, each comprising at least one ethylenically unsaturated group accessible to a free-radical polymerization, (ii) at least one sensitizer which in the presence of at least one coinitiator and upon exposure to radiation of a wavelength of 300 to 480 nni or 750 to 1,100 nm initiates the free-radical polymerization of component (i); and (iii) at least one binder with acidic functional groups and is substantially not sensitive to the wavelength range of 480 to 750 nm; (c) image-wise exposure of the resulting negative working lithographic printing plate precursor to radiation selected from the wavelength range of 300 to 480 nm or 750 to 1,100 nm depending on the sensitizer or initiator system used; and (d) removing the non-irradiated areas by means of a treatment with an alkaline developer with a pH value in the range of 9 to 14 comprising (i) water, (ii) one or more alkali hydroxides in an amount sufficient for adjusting a pH value in the range of 9 to 14; and (iii) 1 to 30 wt. -% of at least one compound of formula (I) wherein R1, R2, R3 and R4 are each independently selected from C1-C12 alkyl groups and aryl groups, X is selected from -CH=CH-, -C=C-, formula (II), formula (III), and formula (IV), n + m results in a value of 2 to 30 and p + q results in a value of 0 to 30, wherein in the case that p + q is not zero, the ethylene oxide and propylene oxide units are present as blocks or randomly distributed.

Description

technical field [0001] The present invention relates to a method of making lithographic printing plates. The invention also relates to a printing form produced according to this method. Background technique [0002] Lithographic printing is based on the immiscibility of oil and water, with oily materials or printing inks being preferentially accepted by image areas, and water or dampening solutions being preferentially accepted by non-image areas. When a properly formed surface is wetted with water and printing ink is applied, the background or non-image areas accept the water and repel the printing ink, while the image areas accept the printing ink and repel the water. The printing ink in the image area is then transferred to the surface of the material, such as paper, fabric, etc., where an image is formed. However, the printing ink is usually first transferred to an intermediate material called a blanket, and then the printing ink is transferred to the surface of the ma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G03F7/32
CPCG03F7/322
Inventor H·鲍曼U·费巴希U·德瓦斯B·施特雷梅尔M·弗卢格尔H·-J·廷珀
Owner KODAK POLYCHROME GRAPHICS