Three-dimensional printing

Patent metadata

Field	Value
Publication number	US-12110362-B2
Application number	US-201816756391-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Nov 30, 2017
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

An example of a three-dimensional (3D) printing kit includes a build material composition and a fusing agent to be applied to at least a portion of the build material composition during 3D printing. The build material composition includes a semi-crystalline thermoplastic polymer having a surface energy density greater than 41 mN/m. The fusing agent includes an energy absorber to absorb electromagnetic radiation to coalesce the semi-crystalline thermoplastic polymer in the at least the portion.

First claim

What is claimed is:

1. A three-dimensional (3D) printing kit, comprising:
a build material composition including an oxygen solution-treated semi-crystalline thermoplastic polymer having a surface energy density greater than 41 mN/m, wherein a surface of the oxygen solution-treated semi-crystalline thermoplastic polymer:
i) is modified with an amine (—NH 2 ) functional group and is prepared using ammonia; or
ii) is modified with a urethane functional group and is prepared using a compound selected from the group consisting of urea and a carbamic acid derivative; or
iii) is modified with an epoxy functional group and is prepared using a glycidyl methacrylate; and

a fusing agent to be applied to at least a portion of the build material composition during 3D printing, the fusing agent including an energy absorber to absorb electromagnetic radiation to coalesce the oxygen solution-treated semi-crystalline thermoplastic polymer in the at least the portion.

2. The 3D printing kit as defined in claim 1 wherein polar elements of the oxygen solution-treated semi-crystalline thermoplastic polymer contribute to at least 5% of the surface energy density and increase a hydrophilicity of the oxygen solution-treated semi-crystalline thermoplastic polymer relative to its native semi-crystalline thermoplastic polymer.

3. The 3D printing kit as defined in claim 1 wherein the oxygen solution-treated semi-crystalline thermoplastic polymer has a surface oxygen content that is increased relative to its native semi-crystalline thermoplastic polymer.

4. The 3D printing kit as defined in claim 1 wherein the oxygen solution-treated semi-crystalline thermoplastic polymer has a bulk density after full tapped consolidation of 0.48 g/mL or less.

5. The 3D printing kit as defined in claim 1 wherein the oxygen solution-treated semi-crystalline thermoplastic polymer has an average particle size ranging from about 2 μm to about 200 μm.

6. The 3D printing kit as defined in claim 1 , further comprising:
a coloring agent selected from the group consisting of a black agent, a cyan agent, a magenta agent, and a yellow agent; or
a detailing agent including a surfactant, a co-solvent, and water; or
an anti-coalescing agent; or
any combination of the coloring agent, the detailing agent, and the anti-coalescing agent.

7. The 3D printing kit as defined in claim 1 wherein one of:
the fusing agent is a core fusing agent and the energy absorber has absorption at least at wavelengths ranging from 400 nm to 780 nm; or
the fusing agent is a primer fusing agent and the energy absorber has absorption at wavelengths ranging from 800 nm to 4000 nm and has transparency at wavelengths ranging from 400 nm to 780 nm.

8. The 3D printing kit as defined in claim 1 wherein the oxygen solution-treated semi-crystalline thermoplastic polymer includes a filler selected from the group consisting of titanium dioxide and glass.

9. The 3D printing kit as defined in claim 1 wherein the oxygen solution-treated semi-crystalline thermoplastic polymer is prepared using an oxygen-introducing liquid selected from the group consisting of sodium hypochlorite and hydrogen peroxide.

10. The 3D printing kit as defined in claim 1 wherein a semi-crystalline thermoplastic polymer of the oxygen solution-treated semi-crystalline thermoplastic polymer is a polyamide.

11. The 3D printing kit as defined in claim 1 wherein the surface of the oxygen solution-treated semi-crystalline thermoplastic polymer is modified with the amine (—NH 2 ) functional group and is prepared using the ammonia.

12. The 3D printing kit as defined in claim 1 wherein the surface of the oxygen solution-treated semi-crystalline thermoplastic polymer is modified with the urethane functional group and is prepared using the urea or the carbamic acid derivative.

Assignees

• Hewlett Packard Development Co

Inventors

• Emamjomeh Ali
• Woodruff Shannon Reuben
• Flack Kenneth
• Long Greg S
• Donovan Katrina
• Fung Erica
• Wright Jacob Tyler
• Stasiak James W

Classifications

• B29C2035/0822

  using IR radiation · CPC title

• B29C2035/0838

  using laser · CPC title

• B29C35/0805

  using electromagnetic radiation · CPC title

• B33Y70/10

  Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials · CPC title

• C08F14/26

  Tetrafluoroethene · CPC title