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Method for preparing silicone mold tooling

  • US 5,326,521 A
  • Filed: 05/26/1993
  • Issued: 07/05/1994
  • Est. Priority Date: 05/26/1993
  • Status: Expired due to Fees
First Claim
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1. A method for preparing silicone molding tooling of a shaped article, comprising the steps of:

  • providing a curable silicone resin composition having at least two parts that, upon mixing, cure to form a silicone rubber;

    mixing the parts of the silicone resin composition to form an uncured silicone rubber having a viscosity between about one million centipoise and about four million centipoise and having the ability to hang on a vertical surface in a layer of about 0.2 cm thickness without significant slumping, said mixing being accomplished in such a manner that entrainment of air in said uncured silicone rubber is avoided;

    spraying the uncured silicone rubber onto a surface to be molded in a single operation with said mixing step, said spraying being done in such a manner that entrainment of air in said uncured silicone rubber is avoided, wherein said layer is at least about 0.1 cm thick; and

    allowing said silicone rubber to cure on said surface to form a mold of said surface.

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