Patent ID: 6162536
Filing Date: 2000-12-19
Classification: B29B,B29C,B29K,C08K,H01B,Y10T

Abstract:
A process for manufacturing a conductive, long conductive fiber-PVC thermoplastic composite material comprising from 60% to 97% by weight of plasticized or unplasticized polyvinyl chloride as the continuous phase, and incorporated in said polyvinyl chloride, from 3% to 40% by weight of chopped pultruded pellets of length 2 mm to 100 mm, said pellets comprising from 20% to 80% by weight of conductive fiber, and 80% to 20% of a PVC-dispersible thermoplastic polymer as the matrix, said pellets having at least 50% wet-out of said fibers with said PVC-dispersible thermoplastic polymer, and wherein the glass transition temperature of said PVC-dispersible polymer is not more than 20.degree. C. higher than the glass transition temperature of said polyvinyl chloride, said process comprising melt processing under heat and shear, rigid polyvinyl chloride resin and pellets comprising parallel, long conductive fibers embedded in a PVC-dispersible thermoplastic matrix, dispersing said long conductive fibers uniformly in the mass of said rigid polyvinyl chloride resin and cooling the mass to form said long conductive fiber-PVC thermoplastic composite which exhibits less than 10.sup.9 Ohms/sq. resistivity.