White ink composition and recording method

Patent metadata

Field	Value
Publication number	US-11999863-B2
Application number	US-202117534525-A
Country	US
Kind code	B2
Filing date	Nov 24, 2021
Priority date	Nov 27, 2020
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A white ink composition which is an aqueous ink jet ink, includes a white colorant and a fixing resin, and the fixing resin contains an acrylic-based resin having an acid value of 50.0 to 100.0 mgKOH/g and a glass transition temperature of 20.0° C. to 50.0° C.

First claim

What is claimed is:

1. A white ink composition which is an aqueous ink jet ink, comprising:
a white colorant; and
a fixing resin,
wherein the fixing resin contains an acrylic-based resin having an acid value of 55.0 to 100.0 mgKOH/g and a glass transition temperature of 23.0° C. to 50.0° C.

2. The white ink composition according to claim 1 ,
wherein the acrylic-based resin is in the form of particles, and
a volume average particle diameter of the particles is 100.0 to 150.0 nm.

3. The white ink composition according to claim 1 ,
wherein a content of the acrylic-based resin with respect to the total mass of the composition is 1.0 to 15.0 percent by mass.

4. The white ink composition according to claim 1 ,
wherein the acrylic-based resin includes constituent units derived from a vinyl monomer, and
a rate of the constituent units derived from a vinyl monomer to all constituent units of the acrylic-based resin is 35.0 percent by mass or less.

5. The white ink composition according to claim 1 ,
wherein the acrylic-based resin includes constituent units derived from an aromatic (meth)acrylate or an alicyclic (meth)acrylate, and
a rate of the constituent units derived from an aromatic (meth)acrylate or an alicyclic (meth)acrylate to all constituent units of the acrylic-based resin is 40.0 percent by mass or less.

6. The white ink composition according to claim 1 ,
wherein the acrylic-based resin includes constituent units derived from a long chain aliphatic (meth)acrylate, and
a rate of the constituent units derived from a long chain aliphatic (meth)acrylate to all constituent units of the acrylic-based resin is 30.0 percent by mass or more.

7. The white ink composition according to claim 1 ,
wherein a content of the white colorant with respect to the total mass of the composition is 5.0 to 20.0 percent by mass.

8. The white ink composition according to claim 1 ,
further comprising: a nitrogen-containing solvent or a glycol ether solvent having 8 carbon atoms or less.

9. The white ink composition according to claim 1 ,
wherein the white ink composition is used to form a recorded matter having a recorded surface, and
the recorded surface is processed by a laminate treatment.

10. The white ink composition according to claim 1 ,
wherein the white ink composition is used for recording on a low-absorbing recording medium or a non-absorbing recording medium.

11. A recording method comprising:
adhering the white ink composition according to claim 1 to a recording medium by an ink jet method.

Assignees

• Seiko Epson Corp

Inventors

• Ishida Kohei

Classifications

• B41J2/2117

  Ejecting white liquids · CPC title

• B41J2/2114

  Ejecting specialized liquids, e.g. transparent or processing liquids (B41J2/211 takes precedence) · CPC title

• C09D11/107 Primary

  from unsaturated acids or derivatives thereof · CPC title

• B41J2/2107

  characterised by the ink properties (supplying ink in a solid state B41J2/17593) · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title