Fire performance for wood veneer laminated ceiling tile

  • US 10,745,920 B2
  • Filed: 10/26/2016
  • Issued: 08/18/2020
  • Est. Priority Date: 10/28/2015
  • Status: Active Grant
First Claim
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1. A ceiling panel comprising a laminate structure, the laminate structure comprising:

  • a cellulosic veneer layer adhesively bonded to a substrate by an adhesive comprising a polyurethane polymer; and

    a topcoat layer applied to the cellulosic layer that is substantially impervious to ambient moisture and comprising an intumescent composition, the topcoat layer having an uppermost exposed surface, the topcoat layer comprising;

    a barrier sub-layer that is substantially impervious to ambient moisture, the barrier sub-layer comprising a first polymer having a first glass transition temperature, the first polymer present in an amount ranging from about 70 wt. % to about 100 wt. % based on the total weight of the barrier sub-layer;

    an intumescent sub-layer comprising the intumescent composition and a second polymer having a second glass transition temperature;

    wherein the barrier sub-layer is atop the intumescent sub-layer and the intumescent sub-layer is atop the cellulosic layer; and

    wherein the first glass transition temperature being equal to or less than the second glass transition temperature; and

    wherein the barrier sub-layer contacts the intumescent sub-layer, and the uppermost exposed surface of the topcoat layer is formed by the barrier sub-layer.

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