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Low shrink low density laminate formulation

  • US 20040023012A1
  • Filed: 06/20/2003
  • Published: 02/05/2004
  • Est. Priority Date: 08/01/2002
  • Status: Active Grant
First Claim
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1. A method for preparing a composite by spray up operation, comprising the steps of:

  • applying a gel coat into a mold;

    applying a barrier coat over the gel coat; and

    applying a laminate formula over the barrier coat, wherein the laminate formula comprises 40-80% by weight paste and 20-60% by weight reinforcing fibers, wherein the paste comprises 70% or more by weight resin, up to 25% by weight filler, and an initiator composition;

    wherein the resin comprises an unsaturated polyester resin curable at a temperature of 50°

    C. or lower;

    the filler comprises particles having a density lower than that of the resin, and the initiator composition contains an optional promoter or accelerator, the initiator composition being capable of initiating cure of the resin at a temperature of 50 C or lower.

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