Solid imaging method using multiphasic photohardenable compositions

• US 5,002,855 A
• Filed: 04/21/1989
• Issued: 03/26/1991
• Est. Priority Date: 04/21/1989
• Status: Expired due to Term

• Current Assignee: DSM Desotech Incorporated (DSM-Firmenich AG)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Fan, Roxy N., Cohen, Abraham B.
• Primary Examiner(s): BRAMMER, JACK
• Application Number:
  US07/341,521
• Time in Patent Office: 704 Days
• Field of Search: 430/269, 430/270, 430/945, 522/2, 425/162, 425/174, 425/174.4, 264/22
• US Class Current: 430/270.1
• CPC Class Codes: B29C 2035/0833 using actinic light
• CPC Class Codes: B29C 2035/0838 using laser
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• CPC Class Codes: B29C 70/64 the filler influencing the surface characteristics of the material, e.g. by concentrating near the surface or by incorporating in the surface by force
• CPC Class Codes: G03F 7/0037 Production of three-dimensional images
• CPC Class Codes: G03F 7/004 Photosensitive materials G03F7/12, G03F7/14 take precedence
• CPC Class Codes: G03F 7/027 Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds G03F7/075 takes precedence
• CPC Class Codes: Y10S 430/146 Laser beam
• CPC Class Codes: Y10S 430/148 Light sensitive titanium compound containing

Abstract

An integral three-dimensional object is formed from a photohardenable liquid composition containing radiation deflecting matter.

Claims

1. A method for accurately fabricating an integral three-dimensional object from successive layers of a photohardenable liquid composition comprising the steps of:

(a) forming a layer of a photohardenable liquid;

(b) photohardening at least a portion of the layer of photohardenable liquid by exposure to actinic radiation;

(c) introducing a new layer of photohardenable liquid onto the layer previously exposed to actinic radiation; and

(d) photohardening at least a portion of the new liquid layer by exposure to actinic radiation, with the requirement that the photohardenable composition comprises an ethylenically unsaturated monomer, photoinitiator, and radiation deflecting matter selected from the group consisting of an emulsified liquid, a solid which is substantially insoluble in the photohardenable composition and combination thereof, the deflecting matter deflecting the actinic radiation and having a first index of refraction, the remainder of the composition except for the deflecting matter having a second index of refraction, the absolute value of the difference between the first index of refraction and the second index of refraction being greater than 0.01.

2. The method of claim 1 wherein steps (c) and (d) are successively repeated.

3. The method of claim 2, wherein the actinic radiation is in the form of a beam.

4. The method of claim 3, wherein the beam is a laser beam.

5. The method of claim 2, wherein the deflecting matter is an emulsified liquid.

6. The method of claim 2, wherein the deflecting matter is a dispersed solid.

7. The method of claim 2, wherein the dispersed solid comprises a particulate organic polymeric compound.

8. The method of claim 2, wherein the dispersed solid comprises a particulate inorganic compound.

9. The method of claim 2, wherein the inorganic compound contains chemically bound oxygen.

10. The method of claim 9, wherein the inorganic compound is selected from the group consisting of oxides and hydroxides of aluminum, silicon, magnesium, zinc, zirconium, and mixtures thereof.

11. The method of claim 2 wherein the deflection matter comprises a combination of emulsified liquid and dispersed solid.

12. The method of claim 2 wherein the deflection matter has higher refractive index than the rest of the composition.

13. A three-dimensional solid part obtained by the method of claim 2.