Compositions: coating or plastic – Coating or plastic compositions – Silicon dioxide containing
Patent
1995-12-29
1997-08-26
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Silicon dioxide containing
106600, 106634, 106636, 106638, 106802, 106808, 106816, 10628723, 10628725, C04B 2206, C09D 100, C09D 104, C09D 712
Patent
active
056606214
ABSTRACT:
A binder composition for three dimensional printing of parts is disclosed which is stable during storage and passage through a printhead, yet able to gel under the conditions existing in a powder bed. The binder composition comprises colloidal silica, a catalyst able to promote gelation of the composition when the composition is below a predetermined pH value, and a base able to maintain the pH of the composition above the predetermined value at which the composition gels. Preferably, the catalyst is polyethylene glycol or another ethylene oxide-derived polymer, and the base is triethanolamine. Upon impact with a powder bed, the pH of the binder composition is reduced, as by adding an acid such as citric acid to the powder, thereby causing the binder to gel in the powder.
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Brunsman David
Massachusetts Institute of Technology
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