Part material for electrophotography-based additive manufacturing

Patent metadata

Field	Value
Publication number	US-9933718-B2
Application number	US-201615259507-A
Country	US
Kind code	B2
Filing date	Sep 8, 2016
Priority date	Jul 17, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A part material for printing three-dimensional parts with an electrophotography-based additive manufacturing system, the part material including a composition having a copolymer (including acrylonitrile units, butadiene units, and aromatic units), a charge control agent, and a heat absorber. The part material is provided in a powder form having a controlled particle size, and is configured for use in the electrophotography-based additive manufacturing system having a layer transfusion assembly for printing the three-dimensional parts in a layer-by-layer manner.

First claim

The invention claimed is:

1. A powder form part material comprising:
a copolymer having a charge control agent, the copolymer having the charge control agent having particles with substantially uniform compositions, the particles configured to be transfused as a layer to at least one additional layer of part material also comprising the copolymer having the charge control agent; and
wherein the part material is configured for use in a electrophotography-based additive manufacturing system having a layer transfusion assembly for printing the three-dimensional parts in a layer-by-layer manner.

2. The part material of claim 1 , and further comprising a heat absorber.

3. The part material of claim 1 , wherein the copolymer comprises aromatic units comprising styrene units.

4. The part material of claim 1 , wherein the heat absorber is an infrared absorber.

5. The part material of claim 1 , wherein the infrared absorber is selected from the group consisting of carbon black, anthraquinone dyes, polycyanine dues, metal dithiolene dyes and pigments, tris aminium dyes, and mixtures thereof.

6. The part material of claim 1 , wherein the copolymer comprises an acrylonitrile-butadiene-styrene (ABS) copolymer.

7. The part material of claim 1 , wherein the charge control agent is selected from the group consisting of chromium oxy carboxylic acid complexes, zinc oxy carboxylic acid complexes, aluminum oxy carboxylic acid complexes, and mixtures thereof.

8. A powder part material for printing three-dimensional parts with an electrophotography-based additive manufacturing system, the part material comprising:
a copolymer having a charge control agent in powder form, wherein the charge control agent constitutes from about 0.1% by weight to about 5% by weight of the part material, wherein particles of the powder have a substantially uniform composition; and
wherein the part material is configured for use in the electrophotography-based additive manufacturing system having a layer transfusion assembly for printing the three-dimensional parts in a layer-by-layer manner.

9. The part material of claim 8 , and further comprising a flow control agent constituting from about 0.1% by weight to about 10% by weight of the part material.

10. The part material of claim 9 , wherein the charge control agent is selected from the group consisting of chromium oxy carboxylic acid complexes, zinc oxy carboxylic acid complexes, aluminum oxy carboxylic acid complexes, and mixtures thereof.

11. The part material of claim 8 , and further comprising a heat absorber constituting from about 0.5% by weight to about 10% by weight of the part material.

12. The part material of claim 11 , wherein the heat absorber is an infrared absorber selected from the group consisting of carbon black, anthraquinone dyes, polycyanine dues, metal dithiolene dyes and pigments, tris aminium dyes, and mixtures thereof.

13. The part material of claim 8 , wherein the copolymer is an acrylonitrile-butadiene-styrene (ABS) copolymer.

14. A method for printing a three-dimensional part with an electrophotography-based additive manufacturing system, the method comprising:
providing a powder form part material comprising a copolymer and a charge control agent to the electrophotography-based additive manufacturing system, wherein the charge control agent constitutes from about 0.1% by weight to about 5% by weight of the part material, and wherein particles of the powder have a substantially uniform composition;
electrically charging the part material;
developing a layer of the three-dimensional part from the charged part material with the electrophotography-based additive manufacturing system;
electrostatically attracting the developed layer; and
moving the attracted layer to a previously-developed layer through the application of heat and pressure utilizing a roller fixed a position.

15. The method of claim 14 and further comprising transfusing the moved layer to the previously-printed layer of the three-dimensional part.

16. The method of claim 14 , wherein the copolymer comprises an acrylonitrile-butadiene-styrene (ABS) copolymer.

17. The method of claim 14 , wherein the part material further comprises a heat absorber.

18. The method of claim 17 , wherein the heat absorber is an infrared absorber selected from the group consisting of carbon black, anthraquinone dyes, polycyanine dues, metal dithiolene dyes and pigments, tris aminium dyes, and mixtures thereof.

19. The method of claim 14 , wherein the part material further comprises a flow control agent.

20. The method of claim 14 , wherein the charge control agent is selected from the group consisting of chromium oxy carboxylic acid complexes, zinc oxy carboxylic acid complexes, aluminum oxy carboxylic acid complexes, and mixtures thereof.

Assignees

• Stratasys Inc

Inventors

• Martin Trevor I

Classifications

• B29C64/147

  using sheet material, e.g. laminated object manufacturing [LOM] or laminating sheet material precut to local cross sections of the 3D object · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/08731

  Polymers of nitriles · CPC title

• G03G15/24

  whereby at least two steps are performed simultaneously · CPC title