Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it

  • US 6,342,284 B1
  • Filed: 08/21/1998
  • Issued: 01/29/2002
  • Est. Priority Date: 08/21/1997
  • Status: Expired due to Term
First Claim
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1. A composition comprising a mixture of:

  • a calcium sulfate material, water, a pregelatinized starch and one or more enhancing materials selected from the group consisting of;

    condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and

    salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units, wherein when said composition is cast in the form of ½

    inch gypsum board, said board has a sag resistance, as determined according to ASTM C473-95, of less than about 0.1 inch per two foot length of said board.

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