Inkjet active-energy-ray-curable composition, three-dimensional object producing method, and three-dimensional object producing apparatus

Patent metadata

Field	Value
Publication number	US-11905425-B2
Application number	US-202217654586-A
Country	US
Kind code	B2
Filing date	Mar 12, 2022
Priority date	Mar 23, 2021
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

Provided is an inkjet active-energy-ray-curable composition including a bisphenol-type methacrylate, a low-viscosity monomer, and an inorganic filler.

First claim

What is claimed is:

1. An inkjet active-energy-ray-curable composition, comprising:
monomer components including a bisphenol-type methacrylate and a low-viscosity monomer; and
an inorganic filler,
wherein the inorganic filler is spherical particles having a volume average primary particle diameter of from 100 nm to 300 nm, and
wherein a mass ratio (A:B) between a content (A) of the monomer components and a content (B) of the inorganic filler is from 80:20 through 40:60.

2. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein the low-viscosity monomer is at least one selected from the group consisting of ethylene glycol dimethacrylate (n=1), diethylene glycol dimethacrylate (n=2), and triethylene glycol dimethacrylate (n=3), which are represented by General formula (1) below,

3. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein the bisphenol-type methacrylate is ethoxylated bisphenol A-type dimethacrylate having a viscosity of 2,000 mPa·s or lower at 25 degrees C.

4. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein a mass ratio (a1:a2) between the bisphenol-type methacrylate (a1) and the low-viscosity monomer (a2) is front 70:30 through 30:70.

5. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein the inorganic filler is at least one selected from the group consisting of silica, alumina, titania, and zirconia.

6. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein a surface of the inorganic filler is reformed with a silane coupling agent.

7. The inkjet active-energy-ray-curable composition according to claim 1 ,
wherein a curing time needed until a storage modulus of the monomer components measured with a photorheometer at a wavelength of 385 nm reaches 1 MPa is 10 seconds or shorter.

8. The inkjet active-energy-ray-curable composition according to claim 1 , wherein a mass ratio (A:B) between a content (A) of the monomer components and a content (B) of the inorganic filler is from 70:30 through 50:50.

9. The inkjet active-energy-ray-curable composition according to claim 2 , wherein the bisphenol-type methacrylate is ethoxylated bisphenol A-type dimethacrylate having a viscosity of 2,000 mPa·s or lower at 25 degrees C.

10. The inkjet active-energy-ray-curable composition according to claim 9 , wherein a mass ratio (a1:a2) between the bisphenol-type methacrylate (a1) and the low-viscosity monomer (a2) is from 70:30 through 30:70.

11. The inkjet active-energy-ray-curable composition according to claim 10 , wherein the inorganic filler is at least one selected from the group consisting of silica, alumina, titania, and zirconia.

12. The inkjet active-energy-ray-curable composition according to claim 1 , wherein the content of the bisphenol-type methacrylate is 20% by mass to 70% by mass based on the total mass of the composition.

13. The inkjet active-energy-ray-curable composition according to claim 10 , wherein the inorganic filler is silica, titania, or alumina, each treated with a silane coupling agent.

14. The inkjet active-energy-ray-curable composition according to claim 1 , wherein the composition comprises 10 to 60% by mass of the filler.

15. The inkjet active-energy-ray-curable composition according to claim 1 , wherein the composition comprises 20 to 60% by mass of the filler.

16. The inkjet active-energy-ray-curable composition according to claim 10 , wherein the composition comprises 20 to 60% by mass of the filler.

17. A three-dimensional object producing method, comprising:
discharging the inkjet active-energy-ray-curable composition according to claim 1 ; and
curing the inkjet active-energy-ray-curable composition discharged, by irradiation with active energy rays.

Assignees

• Shingai Yuki
• Naito Hiroyuki
• Shiba Keisuke
• Ricoh Co Ltd

Inventors

• Shingai Yuki
• Naito Hiroyuki
• Shiba Keisuke

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• B29C64/112

  using individual droplets, e.g. from jetting heads · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title