Three-dimensional object with a glossy surface, formulations and methods of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12070908-B2
Application number	US-202017421041-A
Country	US
Kind code	B2
Filing date	Jan 7, 2020
Priority date	Jan 7, 2019
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

Methods, systems and formulations of building a three-dimensional object with a glossy surface, the method may include: selectively depositing a first material in a plurality of layers to form a body region of the three-dimensional object, wherein said first material comprises a multifunctional acrylic monomer; selectively depositing a second material in a plurality of layers to form a support region, wherein said second material comprises a monofunctional hydrophilic acrylic monomer and does not comprise a multifunctional acrylic monomer; curing each of the deposited layers, wherein in at least one of the deposited layers the first material and the second material mix to form an intermediate region at their mutual interface; dissolving the support region in an aqueous solution; and drying the body region and the intermediate region, whereby the dried intermediate region provides a glossy surface on the body region of said three-dimensional object.

First claim

The invention claimed is:

1. A water-soluble support material formulation configured to contact a surface of a three-dimensional object during additive manufacturing of said three-dimensional object, the formulation comprising:
a first hydrophilic monofunctional curable material comprising N-Isopropylacrylamide (NIPAM) present in an amount of 20 to 40% by weight of the total weight of the formulation;
a second hydrophilic monofunctional curable material comprising N-Hydroxyethyl acrylamide (HEAA) present in an amount of 20% to 40% by weight of the total weight of the formulation;
at least one water-miscible non-curable material present in an amount of 30 to 50% by weight of the total weight of the formulation; and
a photoinitiator;

wherein said formulation is photocurable, and devoid of acryloyl morpholine (ACMO) and devoid of a multifunctional curable material; wherein a total amount of said curable materials is 90% or less, by weight, of the total weight of the formulation; wherein a weight ratio of a total weight of said first hydrophilic monofunctional curable material and a total weight of said second hydrophilic monofunctional curable material ranges from 1:5 to 5:1; and wherein said formulation is configured to leave a glossy effect on the surface of said three-dimensional object after curing and removal.

2. The formulation of claim 1 , featuring a viscosity of from 8 to 40 centipoises at 75° C.

3. The formulation of claim 1 , wherein said additive manufacturing is 3D inkjet printing.

4. The formulation of claim 1 , wherein each of said curable materials is a UV-curable material.

5. The formulation of claim 1 , further comprising one or more additives.

6. The formulation of claim 5 , wherein a total amount of said one or more additives is no more than 3% by weight of the total weight of the formulation.

7. The formulation of claim 1 , wherein said at least one water-miscible non-curable material is selected from water, polyols, alkoxylated polyols, polyethylene glycols, polyvinylpyrrolidones, and any combination thereof.

8. The formulation of claim 1 , wherein said weight ratio of the total weight of said first hydrophilic monofunctional curable material and the total weight of said second hydrophilic monofunctional curable material ranges from 1:2 to 2:1.

9. The formulation of claim 1 , wherein a total amount of said first hydrophilic monofunctional curable material ranges from 20 to 30% by weight of the total weight of the formulation.

10. The formulation of claim 1 , wherein a total amount of said second hydrophilic monofunctional curable material ranges from 20 to 30% by weight of the total weight of the formulation.

11. The formulation of claim 1 , wherein the first hydrophilic monofunctional curable material is Isopropylacrylamide (NIPAM) and the second hydrophilic monofunctional curable material is N-Hydroxyethyl acrylamide (HEAA).

12. The formulation of claim 1 , wherein said water-miscible non-curable material comprises water, present in a range of 1-15% by weight of the total weight of the formulation.

Assignees

• Stratasys Ltd

Inventors

• Peri Dani
• Manna Cesar M

Classifications

• B33Y40/20

  Post-treatment, e.g. curing, coating or polishing · CPC title

• B29C64/124

  using layers of liquid which are selectively solidified · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title