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Process for the manufacture of composite materials

  • US 4,279,695 A
  • Filed: 11/26/1979
  • Issued: 07/21/1981
  • Est. Priority Date: 12/09/1978
  • Status: Expired due to Term
First Claim
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1. A process for the manufacture of an asbestos-free composite material comprising a matrix of set inorganic binder and fibrous reinforcement, comprising dewatering an aqueous slurry containing:

  • (a) water-settable inorganic binder in an amount forming at least half of the solids content of the slurry,(b) web-forming fibres selected from cellulose fibres, polyethylene fibres and polypropylene fibres,(c) reinforcing carbon fibres of tensile modulus not greater than 125 GPa, in an amount forming from about 0.1 to about 2.5% by weight of the solids content of the slurry, and(d) ball clay in an amount which forms from about 5 to 30% by weight of the solids content of the slurry and is such as to reduce shrinkage of the composite material during setting of the inorganic binder.

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