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

Method of making a lithographic printing plate precursor

A lithographic printing plate, lithographic printing technology, applied in the field of phenolic resin, to achieve the effect of stable sensitivity

Inactive Publication Date: 2008-12-03
AGFA NV
View PDF48 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But offline storage must be avoided for several reasons

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
  • Method of making a lithographic printing plate precursor
  • Method of making a lithographic printing plate precursor
  • Method of making a lithographic printing plate precursor

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072]For the preparation of lithographic printing plate precursors, any known method can be used, for example, the above-mentioned ingredients can be dissolved in a solvent mixture, which does not irreversibly react with the ingredients, and preferably depends on the intended coating method, coating thickness , Coating composition and drying conditions were formulated. Suitable solvents include ketones, such as methyl ethyl ketone (MEK), and chlorinated hydrocarbons, such as trichloroethylene or 1,1,1-trichloroethane, alcohols, such as methanol, ethanol or propanol, Ethers, such as tetrahydrofuran, glycol-monoalkyl ethers, such as ethylene glycol monoalkyl ethers, such as 2-methoxy-1-propanol or propylene glycol monoalkyl ethers and esters, such as butyl acetate or propylene glycol monoalkyl ethers Alkyl ether acetates. For specific purposes, it is also possible to use mixtures of the aforementioned solvents, which may additionally contain solvents such as acetonitrile, diox...

Embodiment

[0082] The following composition was coated on a web of conventional surface roughened and anodized aluminum support with a wet coating thickness of 26 μm and a speed of 16 m / min:

[0083] -Methoxypropanol (Dowanol PM TM ) 410.80g

[0084] -Methyl ethyl ketone 266.03g

[0085] -Tetrahydrofuran 209.20g

[0086] -40.4wt.% of novolac

[0087] Dowanol PM TM Solution (Alnovol SPN 452 TM ) 103.25g

[0088] -3,4,5-Trimethoxycinnamic acid 5.34g

[0089] - Dye IR-1 (shown in the above formula) 2.10g

[0090] -Basonylblau 640 TM (contrast dye) 0.53g

[0091] -TEGO Glide 265 TM

[0092] (10wt.% polyalkylene oxide / polysiloxane surfactant solution) 0.85g

[0093] -TEGO Glide 410 TM

[0094] (10wt.% polyalkylene oxide / polysiloxane surfactant solution) 2.12g

[0095] The coating was dried with air at a temperature of 135°C, and the examples of the invention were then subjected to heating and cooling steps. During the heating step, air having the temperature indicated in Table...

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

No PUM Login to View More

Abstract

A method of making a heat-sensitive lithographic printing plate precursor is disclosed which comprises the steps of (i) providing a web of a lithographic support having a hydrophilic surface; (ii) applying on the hydrophilic surface of the web a coating comprising a phenolic resin; (iii) drying the coating; (iv) a heating step wherein the web temperature is maintained above the glass transition temperature of the phenolic resin Tg during a period of between 0.1 and 60 seconds; (v) a cooling step wherein the web temperature is reduced at an average cooling rate which is higher than if the web would be kept under ambient conditions but not higher than 30 DEG C / s; (vi) winding the precursor on a core or cutting the precursor into sheets. The heating and the cooling step provide a significant improvement of the aging behavior of the precursor. A stable sensitivity is obtained shortly after coating.

Description

technical field [0001] The present invention relates to heat-sensitive lithographic printing plate precursors comprising phenolic resins. Background technique [0002] Typically, lithographic techniques involve the use of so-called printing masters, such as printing plates mounted on rotary press cylinders. The master transfers a lithographic image on its surface, and a print is obtained by applying ink to said image and then transferring the ink from the master to a receiving material (typically paper). In conventional lithographic printing, ink and an aqueous fountain solution (also called dampening liquid) are supplied to a lithographic image, which consists of oleophilic (or hydrophobic, i.e. accepts ink, repels water) areas and hydrophilic (or oleophobic, i.e. accept water, repel ink) areas. In so-called waterless offset printing, the lithographic image comprises ink-accepting and abhesive (ink-repelling) areas, and in the waterless offset process only ink is supplied...

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): B41N3/00
CPCB41N3/00B41N3/036
Inventor E·费许伦
Owner AGFA NV