×

Binder composition for use in three dimensional printing

  • US 5,851,465 A
  • Filed: 08/21/1997
  • Issued: 12/22/1998
  • Est. Priority Date: 12/29/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for forming a three dimensional part, comprising:

  • building up the part in layers, the formation of each layer comprising;

    (a) providing a layer of powder in a bed;

    (b) providing a binder composition comprising;

    a fluid dispersing medium;

    silica in a solid particulate form dispersed in the fluid dispersing medium;

    a catalyst able to promote gelation of the binder composition when the binder composition is below a predetermined pH value; and

    a base able to maintain the pH of the binder composition above the predetermined value at which the binder composition gels; and

    (c) selectively depositing through a print head a binder composition onto the powder layer; and

    altering the pH of the binder composition in the powder to below the value at which the binder composition gels, whereby the binder composition becomes immobilized in the powder.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×