Ink composition

Patent metadata

Field	Value
Publication number	US-2016222244-A1
Application number	US-201615008854-A
Country	US
Kind code	A1
Filing date	Jan 28, 2016
Priority date	Jan 29, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

An ink composition includes a white coloring material, polymer particles, and a solvent, the polymer particles satisfying the relationship represented by the following expression (1).
Y ≦0.33 X +20  (1)
where X is an average particle size D50 (nm) and Y is a melting start temperature (° C.).

First claim

What is claimed is:

1 . An ink composition comprising a white coloring material, polymer particles, and a solvent,
the polymer particles satisfying a relationship represented by an expression (1),
Y≦ 0.33 X+ 20  (1)

where X is an average particle size D50 (nm) and Y is a melting start temperature (° C.).

2 . The ink composition as defined in claim 1 , the polymer particles comprising a repeating unit derived from an unsaturated vinyl monomer.

3 . The ink composition as defined in claim 2 , the polymer particles further comprising a repeating unit derived from a monomer that includes two or more polymerizable double bonds.

4 . The ink composition as defined in claim 3 , the polymer particles comprising the repeating unit derived from the monomer that includes two or more polymerizable double bonds in a ratio of 1 to 10 parts by mass based on 100 parts by mass of the polymer particles.

5 . The ink composition as defined in claim 1 , the polymer particles having a solubility in toluene of 10 to 80 mass %.

6 . The ink composition as defined in claim 1 , the polymer particles having been obtained by polymerization in the presence of a chain transfer agent.

7 . The ink composition as defined in claim 1 , the average particle size D50 of the polymer particles being 50 to 500 nm.

8 . The ink composition as defined in claim 1 , the ink composition having an absorbance of 1.1 to 2.2 when the ink composition is diluted with water so that a solid content of the white coloring material is 0.01 mass %.

9 . The ink composition as defined in claim 1 , the average particle size D50 of the white coloring material and the average particle size D50 of the polymer particles satisfying a relationship “D1:D2=1:0.01 to 1:5”, where D1 (nm) is the average particle size D50 of the white coloring material, and D2 (nm) is the average particle size D50 of the polymer particles.

10 . The ink composition as defined in claim 9 , D1 being 100 to 800 nm, and D2 being 100 to 500 nm.

11 . The ink composition as defined in claim 1 , the content of the white coloring material and the content of the polymer particles satisfying a relationship “W1:W2=1:5 to 5:1”, where W1 is the content of the white coloring material, and W2 is the content of the polymer particles.

12 . The ink composition as defined in claim 1 , the white coloring material being aggregates of particles having a primary particle size of 10 to 200 nm.

Assignees

• Seiko Epson Corp
• Mitsui Chemicals Inc

Inventors

• Kagata Takayoshi
• Yoshimura Toshihiro
• Kagawa Yasuyuki
• Egami Yukiko
• Maekawa Hiroshi
• Wachi Hiroko
• Sano Tsuyoshi
• Mizutani Akira
• Denda Atsushi

Classifications

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/322

  Pigment inks · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title