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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0972485 (2008-01-10) |
등록번호 | US-8167999 (2012-05-01) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 2 인용 특허 : 373 |
A materials system and methods are provided to enable the formation of articles by three dimensional printing. The materials system includes particulate mixtures having a whitening agent and a solid particulate additive comprising an acid, the latter adapted for modifying a cure rate of an infiltran
A materials system and methods are provided to enable the formation of articles by three dimensional printing. The materials system includes particulate mixtures having a whitening agent and a solid particulate additive comprising an acid, the latter adapted for modifying a cure rate of an infiltrant. The materials system also includes aqueous fluids including optical brightening agents.
1. A powder adapted for three-dimensional printing, the powder comprising: a loose, dry, and free-flowing particulate mixture comprising: a water-soluble adhesive;plaster;a plaster accelerator;a whitening agent selected from the group consisting of titanium dioxide, hollow glass spheres, and combina
1. A powder adapted for three-dimensional printing, the powder comprising: a loose, dry, and free-flowing particulate mixture comprising: a water-soluble adhesive;plaster;a plaster accelerator;a whitening agent selected from the group consisting of titanium dioxide, hollow glass spheres, and combinations thereof, and having a brightness L* of at least about 90 and a chroma C* of up to about 5.5; anda solid particulate additive comprising an acid,wherein (i) the particulate material is adapted for use in three-dimensional printing to form an article comprised of a plurality of layers, the layers including a reaction product of the particulate mixture and an aqueous fluid that contacts the particulate material during three-dimensional printing, and (ii) the acid has an acid ionization constant pKa selected from a range of about 1 to about 4 and an octanol-water coefficient Kow selected from a range of −1 to 0.5, thereby being adapted for retarding a polymerization rate of a cyanoacrylate infiltrant to facilitate penetration of the infiltrant into the article. 2. The powder of claim 1, wherein the dry particulate mixture has a Bredt parameter of at least about 0.10. 3. The powder of claim 1, wherein an internal angle of friction of the particulate material has a value selected from a range of 40° to 70°. 4. The powder of claim 1 wherein the particulate mixture comprises about 0.01% to about 5% by weight of the whitening agent. 5. The powder of claim 1, wherein a refractive index of the whitening agent is at least about 1.9. 6. The powder of claim 1 wherein the whitening agent has a solubility in an aqueous solution of 5 wt % glycerol of at least about 5 mg/liter. 7. The powder of claim 1 wherein the whitening agent comprises a second water-soluble adhesive. 8. The powder of claim 1 wherein the whitening agent is insoluble in an aqueous solution of 5 wt % glycerol. 9. The powder of claim 1 wherein the water-soluble adhesive comprises polyvinyl alcohol. 10. The powder of claim 1 wherein the acid ionization constant pKa of the acid is selected from a range of 2.8 to 3.2 and an octanol-water coefficient Kow of the acid is selected from a range of about −0.5 to about 0.5. 11. The powder of claim 1 wherein the particulate mixture comprises about 0.01% to about 5% by weight of the solid particulate additive. 12. The powder of claim 1 wherein the solid particulate additive is selected from the group consisting of fumaric acid, tartaric acid, gluconic acids, adipic acid, glucono-delta-lactone (GdL), ethylenediaminetetraacetic acid, succinic acid, a phenolic compound, and combinations thereof. 13. The powder of claim 1, wherein the plaster is selected from the group consisting of plaster of paris, sulphate of lime, hydrated calcium sulphate, dental plaster, CaSO4·½H2O, CaSO4·2H2O, and combinations thereof. 14. The powder of claim 1, wherein the plaster accelerator is selected from the group consisting of hydrated gypsum, potassium sulfate, potassium aluminum sulfate, and combinations thereof. 15. The powder of claim 1 wherein the solid particulate additive is not a catalyst affecting a rate of a reaction between the plaster and the aqueous fluid. 16. The powder of claim 1 wherein the particulate mixture is substantially free of plaster retarders. 17. The powder of claim 1 wherein the particulate mixture comprises 50-95 wt % plaster.
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