Three-dimensional printing material system with improved color, article performance, and ease of use
First Claim
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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; and
a 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.
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Abstract
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.
436 Citations
17 Claims
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1. A powder adapted for three-dimensional printing, the powder comprising:
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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; and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification