Wash liquids for use in additive manufacturing with dual cure resins

Patent metadata

Field	Value
Publication number	US-10471656-B2
Application number	US-201916431389-A
Country	US
Kind code	B2
Filing date	Jun 4, 2019
Priority date	Dec 22, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A method of forming a three-dimensional object, which method includes a cleaning or washing step, is carried out by: (a) providing a carrier and a fill level, and optionally an optically transparent member having a build surface defining the fill level, the carrier and the fill level having a build region therebetween; (b) filling the build region with a polymerizable liquid, the polymerizable liquid comprising a mixture of (i) a light polymerizable liquid first component, and (ii) a second solidifiable component that is different from the first component; (c) irradiating the build region with light, to form a solid polymer scaffold from the first component and also advancing the carrier away from the build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, the three-dimensional object and containing the second solidifiable component carried in the scaffold in unsolidified and/or uncured form; (d) washing the three-dimensional intermediate; and (e) concurrently with or subsequent to the irradiating step, and/or the washing step, solidifying and/or curing the second solidifiable component in the three-dimensional intermediate to form the three-dimensional object.

First claim

We claim:

1. A method of forming a three-dimensional object, comprising:
(a) providing a carrier and a fill level, and optionally an optically transparent member having a build surface defining said fill level, said carrier and said fill level having a build region therebetween;
(b) filling said build region with a polymerizable liquid, said polymerizable liquid comprising a mixture of (i) a light polymerizable liquid first component, and (ii) a second solidifiable component that is different from said first component;
(c) irradiating said build region with light, to form a solid polymer scaffold from said first component and also advancing said carrier away from said build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, said three-dimensional object and containing said second solidifiable component carried in said scaffold in unsolidified and/or uncured form;
(d) washing said three-dimensional intermediate with a wash liquid; and
(e) subsequent to said irradiating step and said washing step, heating said second solidifiable component in said three-dimensional intermediate to form said three-dimensional object.

2. The method of claim 1 , wherein said wash liquid comprises an aqueous wash liquid.

3. The method of claim 1 , wherein said wash liquid comprises an organic solvent.

4. The method of claim 3 , wherein said organic solvent is selected from the group consisting of alcohol, ester, dibasic ester, ketone, acid, aromatic, hydrocarbon, ether, dipolar aprotic, halogenated, and base organic solvents, and combinations thereof.

5. The method of claim 3 , wherein said organic solvent comprises a hydrofluorocarbon, a hydrofluoroether, or a combination thereof.

6. The method of claim 3 , wherein said organic solvent comprises an azeotropic mixture comprised of at least a first organic solvent and a second organic solvent.

7. The method of claim 1 , wherein said wash liquid further comprises a surfactant, chelant, enzyme, or a combination thereof.

8. The method of claim 1 , wherein said second solidifiable component comprises:
(i) a polymerizable liquid solubilized in or suspended in said first component;
(ii) a polymerizable solid suspended in said first component;
(iii) a polymerizable solid solubilized in said first component; or
(iv) a polymer solubilized in said first component.

9. The method of claim 1 , wherein said three-dimensional object comprises a polymer blend, interpenetrating polymer network, semi-interpenetrating polymer network, or sequential interpenetrating polymer network formed from said first component and said second solidifiable component.

10. The method of claim 1 , wherein said second solidifiable component comprises the precursors to a silicone resin, an epoxy resin, a cyanate ester resin, or a natural rubber.

11. The method of claim 1 , wherein said second solidifiable component comprises the precursors to a polyurethane, polyurea, or copolymer thereof.

12. The method of claim 1 , wherein said heating step (e) is carried out under conditions in which said solid polymer scaffold degrades and forms a constituent necessary for the polymerization of said second solidifiable component.

13. The method of claim 1 , wherein said second solidifiable component comprises precursors to a polyurethane, polyurea, or copolymer thereof, a silicone resin, a ring-opening metathesis polymerization resin, a click chemistry resin, or a cyanate ester resin.

14. The method of claim 1 , wherein said irradiating and/or said advancing steps are carried out while also concurrently: (i) continuously maintaining a dead zone of polymerizable liquid in contact with said build surface, and (ii) continuously maintaining a gradient of polymerization zone between said dead zone and said solid polymer and in contact with each thereof, said gradient of polymerization zone comprising said first component in partially cured form.

15. The method of claim 1 , wherein said first component comprises monomers and/or prepolymers comprising reactive end groups selected from the group consisting of acrylates, methacrylates, α-olefins, N-vinyls, acrylamides, methacrylamides, styrenics, epoxides, thiols, 1,3-dienes, vinyl halides, acrylonitriles, vinyl esters, maleimides, and vinyl ethers.

16. The method of claim 1 , wherein said second solidifiable component comprises monomers and/or prepolymers comprising reactive end groups selected from the group consisting of: epoxy/amine, epoxy/hydroxyl, oxetane/amine, oxetane/alcohol, isocyanate/hydroxyl, isocyanate/amine, isocyanate/carboxylic acid, cyanate ester, anhydride/amine, amine/carboxylic acid, amine/ester, hydroxyl/carboxylic acid, hydroxyl/acid chloride, amine/acid chloride, vinyl/Si—H, Si—Cl/hydroxyl, Si—Cl/amine, hydroxyl/aldehyde, amine/aldehyde, hydroxymethyl or alkoxymethyl amide/alcohol, aminoplast, alkyne/azide, click chemistry reactive groups, alkene/sulfur, alkene/thiol, alkyne/thiol, hydroxyl/halide, isocyanate/water, Si—OH/hydroxyl, Si—OH/water, Si—OH/Si—H, Si—OH/Si—OH, perfluorovinyl, diene/dienophiles, olefin metathesis polymerization groups, olefin polymerization groups for Ziegler-Natta catalysis, and ring-opening polymerization groups and mixtures thereof.

17. The method of claim 1 , wherein the wash liquid comprises alcohol.

18. The method of claim 17 , wherein the alcohol comprises isopropanol.

19. The method of claim 1 , wherein the wash liquid comprises a mixture of isopropanol and water.

20. The method of claim 1 , wherein the second solidifiable component comprises a polymerizable liquid suspended in the first component.

21. The method of claim 1 , wherein the second solidifiable component comprises a polymerizable solid suspended in the first component.

22. The method of claim 1 , wherein said three-dimensional object comprises an interpenetrating polymer network formed from said first component and said second solidifiable component.

23. The method of claim 1 , wherein said solid polymer scaffold is discontinuous.

24. The method of claim 1 , wherein said solid polymer scaffold comprises a lattice.

25. The method of claim 1 , wherein said first component comprises monomers and/or prepolymers comprising reactive end groups selected from the group consisting of acrylates and methacrylates.

26. The method of claim 1 , wherein said second solidifiable component comprises monomers and/or prepolymers comprising reactive end groups selected from the group consisting of: isocyanate/hydroxyl and isocyanate/amine.

27. The method of claim 1 , wherein said three-dimensional object is elastomeric.

28. A method of forming a three-dimensional object, comprising:
(a) providing a carrier and a fill level, and optionally an optically transparent member having a build surface defining said fill level, said carrier and said fill level having a build region therebetween;
(b) filling said build region with a polymerizable liquid, said polymerizable liquid comprising a mixture of (i) a light polymerizable liquid first component, and (ii) a second solidifiable component that is different from said first component, wherein said second solidifiable component comprises the precursors to a cyanate ester resin;
(c) irradiating said build region with light, to form a solid polymer scaffold from said first component and also advancing said carrier away from said build surface to fo

Assignees

• Carbon Inc

Inventors

• Mccall William R
• Rolland Jason P
• Converse Courtney F

Classifications

• B29C64/35

  Cleaning · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B29C71/0009

  using liquids, e.g. solvents, swelling agents (spectacle cases, e.g. for cleaning contact lenses A45C11/04; disinfecting or sterilising contact lenses A61L12/00, using liquid substances A61L2/20; cleaning involving the use of liquid in general B08B3/00; for hydrating contact lenses B29D11/00067) · CPC title

• B29C64/124 Primary

  using layers of liquid which are selectively solidified · CPC title

• B29C2071/0045

  Washing using non-reactive liquids · CPC title