Processing fluid, image forming method, recorded matter, and inkjet recording device

Patent metadata

Field	Value
Publication number	US-10160248-B2
Application number	US-201514729193-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Jun 19, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A processing fluid contains a water soluble cation polymer having a quaternary ammonium cation in the main chain, either of one of phosphoric acid-based inorganic salt and p-tert-butyl benzoate, and water, wherein the phosphoric acid-based inorganic salt is either of one of disodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium polyphosphate, dipotassium monohydrogen phosphate, and potassium dihydrogen phosphate, wherein the water soluble cation polymer accounts for 40% by weight to 60% by weight.

First claim

What is claimed is:

1. A processing fluid, comprising:
a water soluble cationic polymer having a quaternary ammonium cation in a main chain;
p-tert-butyl sodium benzoate or a p-tert-butyl potassium benzoate; and
water,
wherein the water soluble cationic polymer is included in an amount of from 40% by weight to 60% by weight, based on a total weight of the processing fluid.

2. The processing fluid according to claim 1 , further comprising:
a citrate.

3. The processing fluid according to claim 1 , wherein the processing fluid further comprises at least one phosphoric acid-based inorganic salt selected from the group consisting of disodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium polyphosphate, dipotassium monohydrogen phosphate, and potassium dihydrogen phosphate.

4. The processing fluid according to claim 1 , wherein the water soluble cationic polymer comprises a repeating unit represented by the formula:

where R1 and R2 each independently represent an alkyl group, a hydroxyalkyl group, an alkenyl group, or a benzyl group, each having one to eight carbon atoms.

5. The processing fluid of claim 1 , wherein the processing fluid has pH of 7 to 10.

6. The processing fluid of claim 1 , wherein the water soluble cationic polymer comprises at least one selected from the group consisting of a copolymer of polyamine-epichlorohydrin, a copolymer of polyamide-epichlorohydrin, a polymer of dialkylallyl ammonium chloride, a polymer of dialkyl aminoethyl (meth)acrylate quaternary ammonium salt, a polymer of modified polyvinyl alcohol dialkyl ammonium salt, and a dialkylallyl ammonium salt.

7. The processing fluid of claim 3 , wherein the processing fluid comprises 0.20% by weight to 2.00% by weight of the phosphoric acid-based inorganic salt, based on the total weight of the processing fluid.

8. The processing fluid of claim 1 , wherein the processing fluid comprises 0.20% by weight to 2.00% by weight of the p-tert-butyl sodium benzoate or the p-tert-butyl potassium benzoate, based on the total weight of the processing fluid.

9. The processing fluid according to claim 3 , wherein the at least one phosphoric acid-based inorganic salt comprises disodium monohydrogen phosphate.

10. The processing fluid according to claim 2 , wherein the citrate is included in an amount of from 0.1% by weight to 2.00% by weight, based on the total weight of the processing fluid.

11. The processing fluid according to claim 2 , wherein the citrate is at least one selected from the group consisting of sodium citrate, disodium citrate, tri sodium citrate, potassium citrate, ammonium citrate, calcium citrate, lithium citrate, and aluminum citrate.

12. The processing fluid according to claim 1 , wherein the processing fluid comprises 0.50% by weight to 1.00% by weight of the p-tert-butyl sodium benzoate or the p-tert-butyl potassium benzoate, based on the total weight of the processing fluid.

13. The processing fluid according to claim 1 , wherein the processing fluid comprises the p-tert-butyl sodium benzoate.

14. The processing fluid according to claim 1 , wherein the processing fluid comprises the p-tert-butyl potassium benzoate.

15. An image forming method, comprising:
providing the processing fluid of claim 1 onto a recording medium; and
discharging an aqueous ink onto the recording medium by an inkjet method to form an image on the recording medium.

16. The image forming method according to claim 15 , wherein the processing fluid has pH of 7 to 10, and the aqueous ink has pH of 7 to 11.

17. The image forming method according to claim 15 , wherein the recording medium has a substrate and a coated layer provided on at least one surface of the substrate.

18. Recorded matter, comprising:
a recording medium; and
an image recorded on the recording medium by the image forming method of claim 15 .

19. An inkjet recording device, comprising:
a processing fluid providing device to provide the processing fluid of claim 1 onto a recording medium; and
an image forming device to discharge an aqueous ink onto the recording medium by an inkjet method such that an image is formed on the recording medium.

Assignees

• Aoai Shosuke
• Namba Michihiko
• Ricoh Co Ltd

Inventors

• Aoai Shosuke
• Namba Michihiko

Classifications

• 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

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title

• B41M5/5218

  characterised by inorganic additives, e.g. pigments, clays · CPC title

• B41M5/5245 Primary

  characterised by the use of polymers containing cationic or anionic groups, e.g. mordants · CPC title