Method of selective laser sintering

Patent metadata

Field	Value
Publication number	US-10315409-B2
Application number	US-201615215285-A
Country	US
Kind code	B2
Filing date	Jul 20, 2016
Priority date	Jul 20, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A method of selective laser sintering is disclosed. The method comprises providing composite particles made by emulsion aggregation, the composite particles comprising at least one thermoplastic polymer and at least one carbon particle material. The composite particles are exposed to a laser to fuse the composite particles.

First claim

What is claimed is:

1. A method of selective laser sintering, the method comprising:
providing composite particles made by emulsion aggregation, the composite particles comprising at least one thermoplastic polymer and at least one carbon particle material uniformly dispersed in the composite particle, the at least one thermoplastic polymer having a low viscosity ranging from about 100 centipoise to about 10,000 centipoise, where viscosity is determined at a shear of 6.28 rad/sec using a TA instruments model DHR2 rheometer with two parallel 25 mm plates at a temperature of 100° C.; and
exposing the composite particles to a laser to fuse the particles.

2. The method of claim 1 , wherein the at least one thermoplastic polymer is a latex.

3. The method of claim 1 , wherein the at least one thermoplastic polymer is selected from the group consisting of polyacrylates, polybenzimidazoles, polycarbonates, polyether sulfones, polyaryl ether ketones, polyetherimide, polyethylenes, polyphenylene oxides, polypropylenes, polystyrenes, styrene-butyl acrylate, polyesters, polyurethanes, polyamides, Poly(vinylidene fluoride) (PVDF), polyvinyl chlorides and combinations thereof.

4. The method of claim 1 , wherein the at least one thermoplastic polymer is selected from the group consisting of polyether ether ketone, polyethylene, poly(ethylene-co-vinylacetate), polypropylene, Poly(vinylidene fluoride-co-hexafluoropropylene), polystyrene, poly(styrene isoprene styrene), acrylonitrile butadiene styrene (ABS), poly(Styrene Ethylene Butylene Styrene) (SEBS), styrene n-butyl acrylate, polyethylene terephthalate, polylactic acid (PLA), polycaprolactone, poly (propoxylated bisphenol A co-fumarate), nylon and combinations thereof.

5. The method of claim 1 , wherein the at least one carbon particle material is selected from the group consisting of carbon nanotubes, graphite, graphene and combinations thereof.

6. The method of claim 1 , whereby the composite particles are formed by a process of emulsion aggregation, the process comprising:
providing a stable emulsion of latex polymer particles;
aggregating the latex polymer particles in the presence of the at least one carbon particle material to form aggregate particles comprising both the latex polymer particles and the carbon particle material; and
heating the aggregate particles to coalesce the latex polymer particles and form composite particles comprising the coalesced latex polymer and the carbon particle material.

7. The method of claim 1 , wherein the carbon particle material is in an amount of at least 5% by weight, based on the total weight of the composite particles.

8. The method of claim 1 , wherein the composite particles are toner.

9. A method of selective laser sintering, the method comprising:
providing composite particles made by emulsion aggregation, the composite particles comprising at least one thermoplastic polymer and at least one carbon particle material uniformly dispersed in the composite particle, the carbon particle material being in an amount of at least 5% by weight based on the total weight of the composite particles, the at least one carbon particle material selected from the group consisting of carbon nanotubes, graphite, graphene and combinations thereof, the at least one thermoplastic polymer having a low viscosity ranging from about 100 centipoise to about 10,000 centipoise, where viscosity is determined at a shear of 6.28 rad/sec using a TA instruments model DHR2 rheometer with two parallel 25 mm plates at a temperature of 100° C.; and
exposing the composite particles to a laser to fuse the particles to form a three-dimensional object by selective laser sintering.

10. The method of claim 9 , wherein the at least one thermoplastic polymer is a latex.

11. The method of claim 9 , wherein the at least one thermoplastic polymer is selected from the group consisting of polyacrylates, polybenzimidazoles, polycarbonates, polyether sulfones, polyaryl ether ketones, polyetherimide, polyethylenes, polyphenylene oxides, polypropylenes, polystyrenes, styrene-butyl acrylate, polyesters, polyurethanes, polyamides, Poly(vinylidene fluoride) (PVDF), polyvinyl chlorides and combinations thereof.

12. The method of claim 9 , wherein the at least one thermoplastic polymer is selected from the group consisting of polyether ether ketone, polyethylene, poly(ethylene-co-vinylacetate), polypropylene, Poly(vinylidene fluoride-co-hexafluoropropylene), polystyrene, poly(styrene isoprene styrene), acrylonitrile butadiene styrene (ABS), poly(Styrene Ethylene Butylene Styrene) (SEBS), styrene n-butyl acrylate, polyethylene terephthalate, polylactic acid (PLA), polycaprolactone, poly (propoxylated bisphenol A co-fumarate), nylon and combinations thereof.

13. The method of claim 9 , wherein the carbon particle material is in an amount of at least 5% by weight, based on the total weight of the composite particles.

14. A method of selective laser sintering, the method comprising:
making composite particles by an emulsion aggregation process, the composite particles comprising at least one thermoplastic polymer and at least one carbon particle material uniformly dispersed in the composite particle, the at least one thermoplastic polymer having a low viscosity ranging from about 100 centipoise to about 10,000 centipoise, where viscosity is determined at a shear of 6.28 rad/sec using a TA instruments model DHR2 rheometer with two parallel 25 mm plates at a temperature of 100° C.; and
exposing the composite particles to a laser to fuse the particles to form a three-dimensional object by selective laser sintering.

15. The method of claim 14 , wherein the at least one thermoplastic polymer is a latex comprising at least one polymer selected from the group consisting of polyacrylates, polybenzimidazoles, polycarbonates, polyether sulfones, polyaryl ether ketones, polyetherimide, polyethylenes, polyphenylene oxides, polypropylenes, polystyrenes, styrene-butyl acrylate, polyesters, polyurethanes, polyamides, Poly(vinylidene fluoride) (PVDF), polyvinyl chlorides and combinations thereof.

16. The method of claim 14 , wherein the at least one thermoplastic polymer is a latex comprising at least one polymer selected from the group consisting of polyether ether ketone, polyethylene, poly(ethylene-co-vinylacetate), polypropylene, Poly(vinylidene fluoride-co-hexafluoropropylene), polystyrene, poly(styrene isoprene styrene), acrylonitrile butadiene styrene (ABS), poly(Styrene Ethylene Butylene Styrene) (SEBS), styrene n-butyl acrylate, polyethylene terephthalate, polylactic acid (PLA), polycaprolactone, poly (propoxylated bisphenol A co-fumarate), nylon and combinations thereof.

17. The method of claim 14 , wherein the at least one carbon particle material is selected from the group consisting of carbon nanotubes, graphite, graphene and combinations thereof.

18. The method of claim 14 , whereby the process of emulsion aggregation comprises:
providing a stable emulsion of latex polymer particles;
aggregating the latex polymer particles in the presence of the at least one carbon particle material to form aggregate particles comprising both the latex polymer particles and the carbon particle material; and
heating the aggregate particles to coalesce the latex polymer particles and form composite particles comprising the coalesced latex polymer and the carbon particle material.

19. The method of claim 18 , wherein providing the stable emulsion of latex polymer particles comprises:
providing at least one monomer material; and
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Assignees

• Xerox Corp

Inventors

• Keoshkerian Barkev
• Wosnick Jordan H
• Prestayko Rachel
• Nosella Kimberly D
• Farrugia Valerie M
• Zwartz Edward G

Classifications

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B29C64/135 Primary

  the energy source being concentrated, e.g. scanning lasers or focused light sources · CPC title

• B29K2067/00

  Use of polyesters {or derivatives thereof}, as moulding material · CPC title

• B33Y70/00 Primary

  Materials specially adapted for additive manufacturing · CPC title

• B29K2105/251

  Particles, powder or granules (expandable particles B29K2105/046) · CPC title