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Foams produced under reduced pressure and method of preparing such foams

  • US 5,439,945 A
  • Filed: 01/10/1994
  • Issued: 08/08/1995
  • Est. Priority Date: 01/10/1994
  • Status: Expired due to Fees
First Claim
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1. A method for preparing an insulation foam wherein one or more polymeric foam forming materials are reacted under foam forming conditions and wherein cell voids are created in the foam during the reaction, the improvement comprising the steps of:

  • causing the foam forming materials to react in an area to form cell voids;

    maintaining a negative pressure condition in the area during the time the reaction is occurring; and

    encasing the resultant polymeric foam in a gas impermeable material wherein the negative pressure in the cell voids is maintained.

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