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
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[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
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