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Pultrusion process for preparing composites

  • US 5,294,461 A
  • Filed: 03/30/1992
  • Issued: 03/15/1994
  • Est. Priority Date: 01/30/1989
  • Status: Expired due to Fees
First Claim
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1. A pultrusion process for preparing a fiber reinforced polymer composite, which comprises:

  • (a) continuously pulling a roving or tow of continuous longitudinally aligned filaments successively through an impregnation chamber and a die;

    (b) continuously mixing the components required to form a polymer, said components including a reactive monomer, thereby forming a liquid precursor mixture including said reactive monomer and having a substantially lower viscosity than that of said polymer, and feeding the resulting precursor mixture to said impregnation chamber;

    (c) contacting said filaments with said precursor mixture in said impregnation chamber, thereby forming a coating of said precursor mixture on said filaments in said impregnation chamber, the conditions in said impregnation chamber being such that substantially complete wetting of said filaments by said precursor mixture takes place and such that substantially no polymerization takes place;

    (d) directing the coated filaments from step (c) through a die and heating the coated filaments in said die to reaction temperature, thereby causing polymerization to take place in said die, wherein a solid composite comprising filaments coated with a solid polymer is formed; and

    (e) drawing said composite from said die.

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