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Fiber reinforced composite structural laminate composed of two layers tied to one another by embedded fibers bridging both layers

  • US 4,242,406 A
  • Filed: 04/30/1979
  • Issued: 12/30/1980
  • Est. Priority Date: 04/30/1979
  • Status: Expired due to Term
First Claim
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1. A structural laminate comprising:

  • (a) a plastic surface finish coat bonded to(b) a reinforcing layer of an organic resin selected from polyester resins and epoxy resins containing reinforcing fibers, adhered to(c) a bonding layer of organic resin coated glass fibers which are bonded to the reinforcing layer and which protrude therefrom, said glass fibers being present in an amount sufficient to provide a surface density of 0.25 to 0.65 ounces per square foot of reinforcing layer surface area, said protruding glass fibers being coated with an amount of the organic resin sufficient to promote adhesion of the fibers to one another at their intersections, but insufficient to encapsulate the fibers so as to prevent the gypsum layer (d) from intimately surrounding and engaging a substantial portion of the individual protruding coated fibers, said coated glass fibers being engaged and surrounded by(d) a gypsum layer reinforced with glass fibers which functions as the structural base, and said structural laminate is characterized by having a bond strength between the gypsum layer and the plastic layer with which it interfaces of at least about 150 psi as determined by ASTM C297-68.

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