Processing fluid for image forming by aqueous ink, image forming method, recorded matter, and inkjet recording device

Patent metadata

Field	Value
Publication number	US-10093828-B2
Application number	US-201615094255-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Apr 23, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A processing fluid for image forming by an aqueous ink includes a flocculant to aggregate a colorant in the aqueous ink, a water-soluble organic solvent, a polymer particle, and water. The polymer particle has a core-shell structure with a core portion including a wax and a shell portion having a lower critical solution temperature of 30 degrees C. or higher.

First claim

What is claimed is:

1. A processing fluid for image forming by an aqueous ink, the processing fluid comprising:
a flocculant configured to aggregate a colorant in the aqueous ink;
a water-soluble organic solvent;
a polymer particle; and
water,
wherein the polymer particle has a core-shell structure with a core portion including a wax and a shell portion having a lower critical solution temperature of 30 degrees C. or higher.

2. The processing fluid according to claim 1 , wherein the shell portion has a lower critical solution temperature of from 40 to 80 degrees C.

3. The processing fluid according to claim 1 , wherein the flocculant includes a water-soluble cationic polymer.

4. The processing fluid according to claim 3 , wherein the water-soluble cationic polymer has a quaternary ammonium cation in a main chain of the water-soluble cationic polymer.

5. The processing fluid according to claim 4 , wherein the water-soluble cationic polymer includes a repeating unit represented by the following chemical formula 1

where R1 and R2 each, independently represent alkyl groups having 1 to 8 carbon atoms, hydroxyalkyl groups having 1 to 8 carbon atoms, alkenyl groups having 2 to 8 carbon atoms, or benzyl groups.

6. An image forming method comprising:
applying the processing fluid of claim 1 to a recording medium;
discharging an aqueous ink to the recording medium by an inkjet method to form an image on the recording medium; and
drying the recording medium on which the image is formed by heat.

7. The image forming method according to claim 6 , wherein the recording medium has a coated layer on at least one surface of a substrate of the recording medium.

8. Recorded matter comprising:
a recording medium; and
an image recorded on the recording medium by the image forming method of claim 6 .

9. An inkjet recording device comprising:
the processing fluid of claim 1 ;
a conveyance unit to convey a recording medium in a conveyance direction;
a processing fluid applying device configured to apply the processing fluid to the recording medium;
an image forming device configured to discharge the aqueous ink to the recording medium by an inkjet method to form an image on the recording medium; and
a drier disposed downstream in the conveyance direction from the image forming device, to heat the recording medium bearing the image formed by the image forming device.

Assignees

• Aoai Shosuke
• Ricoh Co Ltd

Inventors

• Aoai Shosuke

Classifications

• C08G73/0226

  Quaternisation of polyalkylene(poly)amines · CPC title

• C09D179/02 Primary

  Polyamines · CPC title

• B41J11/002

  Curing or drying the ink on the copy materials, e.g. by heating or irradiating · CPC title

• B41J2/2146

  for line print heads · CPC title

• B41M5/0017

  Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying · CPC title