Binder compositions for laser sintering processes

Details Binder compositions for laser sintering processes Binder compositions for laser sintering processes

1997-06-24

2000-04-11

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263297, C08F22010

Patent

active

060489545

ABSTRACT:
The development of polymer binder compositions that provide novel binders for high temperature inorganic particulates, especially metal and ceramic particulates is described. These materials are especially useful in a laser beam sintering process known as SLS.TM. that forms accurately shaped high strength green objects. The new binders may be thermally removed in post-shaping operations without significant residual ash. The resulting structures contain only metal, ceramic, or metal ceramic materials. The inventive methods developed for producing the new polymeric binder materials are based in part on using emulsion forms of selected polymers at controlled low molecular weights and high melt flow. An important aspect of the process is the semi-batch addition of selected chain transfer agents to the reacting emulsion. This optimizes coating characteristics of the polymer binder and results in high part strengths of the prototype parts produced in the SLS.TM. process.

REFERENCES:
patent: 3110702 (1963-11-01), Delacvetaz
patent: 3222328 (1965-12-01), La Comlee et al.
patent: 4041194 (1977-08-01), Jenkins
patent: 4728701 (1988-03-01), Jarvis et al.
patent: 4863538 (1989-09-01), Deckard
patent: 4938816 (1990-07-01), Beaman et al.
patent: 4994817 (1991-02-01), Munson et al.
patent: 5017753 (1991-05-01), Deckard
patent: 5076869 (1991-12-01), Bourell et al.
patent: 5147587 (1992-09-01), Marcus et al.
patent: 5156697 (1992-10-01), Bourell et al.
patent: 5182170 (1993-01-01), Marcus et al.
patent: 5284695 (1994-02-01), Balow et al.
patent: 5420218 (1995-05-01), Toribuchi et al.
patent: 5483016 (1996-01-01), Aoki et al.
Baird, "Xerographic materials," Encyclopedia of Polymer Science and Engineering, vol. 17, John Wiley & Sons, New York, pp. 918-943, 1989.
Kumar and Gupta, "Emulsion polymerization," Fundamentals of Polymers, The McGraw-Hill Companies, Inc. New York, 1998, Chapter 7.
Madorsky, Thermal Degradation of Organic Polymers, Interscience Publishers, New York, 1964, pp. 42-43, 82-83, 88-91, 98-101, 112-113, 118-119, 144-145, 150-151, 160-161, 188-193, 295-303.
Rodriguez, Principles of Polymer Systems, 4th Ed., Taylor & Francis Publishers, 1996, pp. 170-173.
Ashley, S., "Rapid Prototyping Systems", Mechanical Engineering, 34-43, Apr. 1991.
Badrinarayan, B., et al., "Metal Parts From Selective Laser Sintering of Metal-Polymer Powders", Solid Freeform Fabrication Symposium Proceedings, 3:141-146, 1992.
Badrinarayan, B., et al., "Selective Lawer Sintering of a Coopper-PMMA System", Solid Freeform Fabrication Symposium Proceedings, 4:245-250, 1993.
Bourell, D.L., et al., "Solid Freeform Fabrication An Advanced Manufacturing Approach", Solid Freeform Fabrication Symposium Proceedings, 1:1-7, 1990.
Graessley, W.W., et al., "The Shear-Rate Dependence of Viscosity in Concentated Solutions of Narrow-Distribution Polystyrene", Transactions of the Society of Rheology, 11:3, 267-285, 1967.
Nelson, J.C., et al., "Laser Sintering Model for Composite Materials", Solid Freeform Fabrication Symposium Proceedings, University of Texas, Austin, Texas, 4:360-369, 1993.
Sanayei, R.A., et al., "Catalytic Chain-Transfer in Polymerization of Methyl Methacrylate. I. Chain-Length Dependence of Chain-Transfer Coefficient", J. Macro. Sci.-Chem., A26(8):1137-1149, 1989.
Urquhart, A.W., "Molten Metals Sire MMCs, CMCs", Advanced Materials and Processses, 7:25-29, 1991.
Vail, N.K., et al., "Effect of Polymer Coatings as Intermediate Binders on Sintering of Ceramic Parts", Solid Freeform Fabrication Symposium, The University of Texas: Austin, Texas, 2:195-204, 1991.
Vail, N.K., et al., "Development of a Poly(Methyl Methacrylate-co-n-Butyl Methacrylate) Copolymer Binder System", J. of Applied Polymer Sci., 52:789-812, 1994.
Zong, G., et al., "Direct Selective Laser Sintering of High Temperature Materials", Solid Freeform Fabrication Symposium Proceedings, The University of Texas, Austin, Texas, 3:72-85, 1992.
DC Blackley, Emulsion Polymerization, Wiley, New York, 1975, pp. 14-15.
PLASPEC database AN 400-4074, 400-4071, and 400-1159; AN 400-16884, 400-16879, and 400-16874.
Braudrup and Numergut, Eds, Polymer Handbook, 2d Ed., Wiley, New York, 1975, pp. II-475 and III-150.
Hawley's Condensed Chemical Dictionary, 11.sup.th Ed., Van Nostrand Reinhold, New York, 1987, 928.

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