Oil-based ink for preparing printing plate by ink jet process an

Details Oil-based ink for preparing printing plate by ink jet process an Oil-based ink for preparing printing plate by ink jet process an

1998-01-27

2000-06-27

Cameron, Erma

Coating processes

Direct application of electrical, magnetic, wave, or...

Electrostatic charge, field, or force utilized

427 58, 427340, 4274121, 427421, B05D 104

Patent

active

060804491

ABSTRACT:
An oil-based ink for a printing plate by an ink jet process comprising spraying an oil-based ink comprising at least resin particles dispersed in a nonaqueous carrier liquid having an electric resistance of 10.sup.9 .OMEGA.cm or more and a dielectric constant of 3.5 or less on an image receiving layer of a lithographic printing plate precursor dropwise from a nozzle to form an image, and then desensitizing a non-image area of the image receiving layer by a chemical reaction to prepare a lithographic printing plate, the image receiving layer being formed on a water-resistant support and comprising zinc oxide and a binding resin; and a surface of the image receiving layer having a contact angle with water of 50.degree. or more, wherein the resin particles dispersed are polymer particles obtained by polymerization granulation of a solution comprising (i), (ii) and (iii): (i) at least one monofunctional monomer (A) which is soluble in a nonaqueous solvent which is at least miscible with the nonaqueous carrier liquid and becomes insoluble therein by polymerization; (ii) (ii-a) at least one monomer which is copolymerizable with the monomer (A), or (ii-b) at least one monofunctional macromonomer (MA) having a weight average molecular weight of 2.times.10.sup.4 or less in which a polymerizable double bond group is combined with only one end of a main chain of a polymer comprising a repeating unit corresponding to a monomer; and (iii) at least one dispersion-stabilizing resin which is soluble in the nonaqueous solvent and has no graft group polymerizing with a monomer.

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Leach, R. H. and Pierce, R. J.; The Printing Ink Manual, Blueprint, London (p. 63), 1993.

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