Ink composition and ink jet recording set

Patent metadata

Field	Value
Publication number	US-11027556-B2
Application number	US-201916724477-A
Country	US
Kind code	B2
Filing date	Dec 23, 2019
Priority date	Dec 25, 2018
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

An ink composition to be used in an ink jet recording apparatus includes a self-dispersing pigment, a soap-free resin, and water. When 15 g of the ink composition is weighed into a 50-mL sample bottle and the sample bottle is shaken 100 times for one minute, at 60 seconds after shaking, a foam height from a liquid level is 1 cm or less.

First claim

What is claimed is:

1. An ink composition to be used in an ink jet recording apparatus, the ink composition comprising:
a self-dispersing pigment;
a soap-free resin; and
water, wherein
when 15 g of the ink composition is weighed into a 50-mL sample bottle and the sample bottle is shaken 100 times for one minute, at 60 seconds after shaking, a foam height from a liquid level is 1 cm or less.

2. The ink composition according to claim 1 , wherein
the ink jet recording apparatus includes an ink storage container having an ink pouring port, and
a height from an inner wall of the ink storage container facing the ink pouring port to the ink pouring port is 3 cm or more.

3. The ink composition according to claim 1 , wherein
a content A of the self-dispersing pigment is 4.0% by mass or more and 8.0% by mass or less,
a content B of the soap-free resin is 1.5% by mass or more and 5.0% by mass or less,
a total value F of the content A of the self-dispersing pigment and the content B of the soap-free resin is 5.5% by mass or more and 11.0% by mass or less, and
a ratio in percent by mass of the content A of the self-dispersing pigment to the content B of the soap-free resin, k=A/B, is 3.0 or less.

4. An ink jet recording set comprising:
an ink jet recording apparatus; and
an ink supply container containing an ink composition, wherein
the ink jet recording apparatus includes an ink storage container having an ink pouring port;
a height from an inner wall of the ink storage container facing the ink pouring port to the ink pouring port is 3 cm or more;
the ink composition includes a self-dispersing pigment, a soap-free resin, and water; and
when 15 g of the ink composition is weighed into a 50-mL sample bottle and the sample bottle is shaken 100 times for one minute, at 60 seconds after shaking, a foam height from a liquid level is 1 cm or less.

5. The ink jet recording set according to claim 4 , wherein,
in the ink composition,
a content A of the self-dispersing pigment is 4.0% by mass or more and 8.0% by mass or less,
a content B of the soap-free resin is 1.5% by mass or more and 5.0% by mass or less,
a total value F of the content A of the self-dispersing pigment and the content B of the soap-free resin is 5.5% by mass or more and 11.0% by mass or less, and
a ratio in percent by mass of the content A of the self-dispersing pigment to the content B of the soap-free resin, k=A/B, is 3.0 or less.

Assignees

• Seiko Epson Corp

Inventors

• Uchida Kenta

Classifications

• C09D11/322

  Pigment inks · CPC title

• B41J29/13 Primary

  Cases or covers · CPC title

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/32

  characterised by colouring agents · CPC title

• C08J2367/07

  having terminal carbon-to-carbon unsaturated bonds · CPC title