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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
First Claim
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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.

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