×

Gypsum composites used in fire resistant building components

  • US 9,027,296 B2
  • Filed: 11/17/2014
  • Issued: 05/12/2015
  • Est. Priority Date: 06/29/2012
  • Status: Active Grant
First Claim
Patent Images

1. A core for a fire rated door comprising:

  • a fire resistant center panel having a bottom, a top, a first side, a second side, a first end and a second end, wherein the fire resistant center panel comprises;

    a first fire resistant panel made of a first fire resistant material comprising gypsum in an amount sufficient to provide fire resistance wherein the amount is 60 to 85% by weight, fibers in an amount of 1.5 to 5% by weight substantially homogeneously distributed through the composite, an aggregate in an amount of 10 to 25% by weight substantially homogeneously distributed through the composite, a starch in an amount of 2 to 7% by weight and a rheology-modifying agent in an amount of 0.5 to 4% by weight,a second fire resistant panel made of the first fire resistant material, anda fire resistant insert disposed between and attached to the first fire resistant panel and the second fire resistant panel, wherein the fire resistant insert is made of a second fire resistant material comprising gypsum in an amount sufficient to provide fire resistance wherein the amount is 70 to 90% by weight, glass fibers in an amount of 2 to 10% by weight substantially homogeneously distributed through the composite, cellulose fibers in an amount of 2 to 8% by weight substantially homogeneously distributed through the composite, polyvinyl alcohol fibers in an amount of 1 to 4% by weight substantially homogeneously distributed through the composite, polypropylene fibers in an amount of 0.3 to 4% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight; and

    an extruded fire resistant border attached to the first side, the second side, the first end and the second end of the fire resistant center panel, wherein the extruded fire resistant border is made of the second fire resistant material.

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