Curable jettable liquid for flexography

A flexographic printing plate, liquid technology, applied in printing, photosensitive materials for optomechanical equipment, applications, etc., can solve the problems of ink not included and inferior quality of flexographic printing plates

Inactive Publication Date: 2006-03-22
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disclosed ink does not contain any elastomers and the quality of the flexogr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0122] Preparation of Curable Jettable Liquids

[0123] The colorant dispersion for the curable jettable liquid according to the present invention can be prepared by mixing, grinding and dispersing the colorant and resin. Mixing equipment may include pressure kneaders, open kneaders, planetary mixers, dissolvers, and Dalton universal mixers. Suitable grinding and dispersing equipment are colloid mills, high-speed dispersers, twin rolls, bead mills, paint conditioners, and triple rolls.

[0124] During the mixing, grinding and dispersing processes, each process is carried out with cooling to prevent heat build-up and, as far as possible, under light conditions that substantially exclude UV light.

[0125] ink receiver

[0126] A curable jettable liquid according to the invention is jetted onto an ink receiver surface. The ink receiver comprises a flexible carrier and generally at least one photopolymerizable layer, which may be partially or fully polymerized.

[0127] carri...

Embodiment 1

[0249] This example illustrates the problem of incorporating elastomers in curable sprayable liquids.

[0250] A number of elastomers were tested for their solubility in a typical UV curable inkjet ink INK-1. For simplicity, no colorant was added to INK-1, and its composition is shown in Table 1.

[0251] INK-1

[0252] The solubility of the elastomers of Table 2 was tested in UV curable inkjet ink INK-1 by adding the elastomers in an amount of 16 wt% based on the total ink weight.

[0253] elastomer

[0254] From Table 2 it is clear that none of the elastomers are directly soluble in the radiation curable composition.

[0255] Therefore, an indirect method of introducing elastomers in UV-curable inkjet ink INK-1 was attempted, which included the following steps:

[0256] ·Choose the right organic solvent

[0257] · Dissolve the elastomer in the solvent of choice

[0258] · Mixing elastomer solution with UV-curable inkjet ink INK-1

[0259] Evaporate t...

Embodiment 2

[0269] This example illustrates the necessity of plasticizers in the jettable liquid for making flexographic printing plates of high quality using a jettable liquid comprising monofunctional monomers, polyfunctional monomers and / or oligomers and a photoinitiator .

[0270] curable sprayable liquid

[0271] Crystal UFE ink is described by SUN CHEMICALS as a UV curable ink with improved flexibility. UV curable black ink CrystalUFE in EP 1428666A (AGFA)  7577 is used in the preparation of flexographic printing plates. In this example the similar cyan ink Crystal UFE  5562 was used to prepare comparative curable sprayable liquids COMP-1 and COMP-2 according to Table 6. Comparative curable sprayable liquid COMP-3 and the inventive curable sprayable liquid INV-1 were also prepared according to Table 6.

[0272] compound

[0273] Preparation of flexographic printing plates

[0274] Comparative curable sprayable liquids COMP-1 to COMP-3 and inventive curable sprayabl...

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Abstract

A curable jettable liquid for manufacturing a flexographic printing plate comprising at least one photo-initiator, at least one monofunctional monomer, at least 5 wt % of a polyfunctional monomer or oligomer and at least 5 wt % of a plasticizer both based on the total weight of the curable jettable liquid capable of realizing a layer after curing having an elongation at break of at least 5%, a storage modulus E' smaller than 200 MPa at 30 Hz and a volumetric shrinkage smaller than 10%.

Description

technical field [0001] The present invention relates to digital flexographic printing, and more particularly to curable jettable liquids for making flexographic printing plates. Background technique [0002] Flexographic printing plates are well known for printing on soft and deformable surfaces, such as packaging materials, such as cardboard and plastic films. They can be prepared from printing plate precursors having a layer consisting of a photopolymerizable composition, generally comprising an elastomeric binder, at least one monomer and a photoinitiator. Earlier patents on flexographic printing plates include US3960572 (ASAHICHEMICAL), US3951657 (UP JOHN), US4323637 (DU PONT) and US4427759 (DU PONT). [0003] Traditionally, an image is applied to a printing plate precursor by flood exposing the photopolymerizable layer to actinic radiation, such as ultraviolet radiation, using an image mask positioned between the radiation source and the printing plate precursor. Acti...

Claims

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Application Information

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IPC IPC(8): G03F7/004G03F7/027
CPCB41C1/003C09D11/101G03F7/027
Inventor D·埃迪L·卢克
Owner AGFA NV
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