White ink, printed matter, method of printing, and device for printing

Patent metadata

Field	Value
Publication number	US-10947398-B2
Application number	US-201715494725-A
Country	US
Kind code	B2
Filing date	Apr 24, 2017
Priority date	May 2, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A white ink includes a hollow resin particle, an organic solvent, an acrylic silicone resin, and water, wherein the acrylic silicone resin has a resin solubility parameter smaller than that of the hollow resin particle.

First claim

What is claimed is:

1. A white ink comprising:
a hollow resin particle;
an organic solvent;
an acrylic silicone resin; and
water,
wherein the acrylic silicone resin has a resin solubility parameter smaller than a resin solubility parameter of the hollow resin particle,
wherein an amount of the hollow resin particles in the white ink is from 8.5 to 10% by mass, based on the white ink,
wherein the resin solubility parameter of the hollow resin particle is 9 to 11 (cal/cm 3 ) 0.5 , and
wherein the resin solubility parameter of the acrylic silicone resin is 8 to 10 (cal/cm 3 ) 0.5 .

2. The white ink according to claim 1 , wherein the resin solubility parameter of the hollow resin particle and the resin solubility parameter of the acrylic silicone resin have a difference of 1 to 3 (cal/cm 3 ) 0.5 .

3. The white ink according to claim 1 , wherein the acrylic silicone resin has a glass transition temperature of 30 degrees C. or higher.

4. The white ink according to claim 1 , wherein the hollow resin particle includes one of a styrene and acrylic copolymer, a methylmethacrylate resin, and a phenol resin.

5. The white ink according to claim 1 , wherein the white ink has a luminosity of L* or higher at an attached amount of the white ink of 2.1 mg/cm 2 on a substrate, where L* is represented by the following relation:
L*=0.2×smoothness (seconds) of the substrate +50,

wherein the smoothness is measured by an Oken smoothness tester.

6. The white ink according to claim 1 , wherein the organic solvent is at least one selected from the group consisting of glycerin, 1,2-propanediol, 1,2-butanediol, 3-ethyl-3-hydroxymethyl oxetane, and 3-methoxy-N,N-dimethyl propoxyamide.

7. The white ink according to claim 1 , wherein the hollow resin particles are present in an amount of 10% by mass;
wherein the substrate is paper;
wherein the solubility parameter of the hollow resin particles is from 9.0 to 11.0;
wherein the organic solvent is at least one selected from the group consisting of glycerin, 1,2-propanediol, 1,2-butanediol, 3-ethyl-3-hydroxylmethyl oxetane and 3-methoxy-N,N-dimethyl propoxyamide;
wherein the organic solvent is present in an amount of 33% by weight;
the solubility parameter of the acrylic silicone resin is from 8.0 to 10.0;
the acrylic silicon resin is present in an amount of 2% by mass;
wherein the white ink further comprises a wax in an amount of 1% by mass,
a surfactant in an amount of 0.5% by mass,
a defoaming agent in an amount of 0.75% by mass,
an antibacterial agent in an amount of 0.1 by mass,
a pH regulator in an amount of 0.2% by mass, and water in an amount of from 52.45 to 53.7% by mass; and
wherein the difference in the solubility parameter between the hollow resin particle and the acrylic silicone resin is from 1 to 3.

8. The white ink according to claim 1 , wherein the acrylic silicone resin has a T g of 30-45° C.

9. The white ink according to claim 1 , having a luminosity (TANT-3 seconds) of from 54.3 to 61.3.

10. Printed matter comprising:
a substrate having a smoothness of 120 seconds or less as measured by an Oken smoothness tester; and
a white printed layer including a hollow resin particle, an organic solvent, and acrylic silicone resin,
wherein the acrylic silicone resin has a resin solubility parameter smaller than a resin solubility parameter of the hollow resin particle,
wherein the resin solubility parameter of the hollow resin particle is 9 to 11 (cal/cm 3 ) 0.5 , and
wherein the resin solubility parameter of the acrylic silicone resin is 8 to 10 (cal/cm 3 ) 0.5 , and
wherein the hollow resin particle has a permeation depth of 1 to 25 μm to the substrate.

11. The printed matter according to claim 10 , wherein the substrate is paper and the acrylic silicone resin is preferentially permeated into the substrate in comparison to the hollow resin particle.

12. The printed matter of claim 10 , wherein the substrate is paper and the hollow resin particles have a permeation depth in the paper (TANT-3 seconds) of from 16.1 to 25 μm.

13. A method of printing comprising:
applying the white ink of claim 1 to a substrate.

14. The method according to claim 13 , wherein the substrate has a smoothness of 120 seconds or less, measured by an Oken smoothness tester.

15. A device for printing, comprising:
an ink accommodating unit configured to accommodate an ink including the white ink of claim 1 ; and
an ink discharging head configured to discharge the ink.

Assignees

• Katsuragi Koji
• Ricoh Co Ltd

Inventors

• Katsuragi Koji

Classifications

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• C09D11/30

  Inkjet printing inks · CPC title

• C09D11/107 Primary

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/10

  based on artificial resins · CPC title

• C09D11/108

  Hydrocarbon resins · CPC title