초록 ▼

A process for the continuous preparation of a coated, long fiber reinforcing composite structure suitable for the preparation of shaped articles. The process is characterized by impregnating a plurality of continuous lengths of reinforcing fiber strands with a first thermoplastic resin material whil

A process for the continuous preparation of a coated, long fiber reinforcing composite structure suitable for the preparation of shaped articles. The process is characterized by impregnating a plurality of continuous lengths of reinforcing fiber strands with a first thermoplastic resin material while continuously drawing the fiber strands to produce a long fiber reinforcing composite structure followed by coating a second thermoplastic resin material containing additives onto the long fiber reinforcing composite structure to produce a coated, long fiber reinforcing composite structure. The coating additives may be selected from mineral reinforcing agents, lubricants, flame retardants, blowing agents, foaming agents, ultraviolet light resistant agents, heat sensitive pigments, etc. The coated, long fiber reinforcing composite structure prepared according to the process is suitable for the preparation of shaped articles exhibiting good physical and chemical properties.

대표청구항 ▼

[ We claim:] [1.] A process for the continuous preparation of a coated, long fiber reinforced composite structure suitable for the preparation of shaped articles, comprising the steps of:a. extruding a mass of a first thermoplastic resin material in a flowable state having no discrete shape into and

[ We claim:] [1.] A process for the continuous preparation of a coated, long fiber reinforced composite structure suitable for the preparation of shaped articles, comprising the steps of:a. extruding a mass of a first thermoplastic resin material in a flowable state having no discrete shape into and longitudinally through an elongated, first stationary die having no relatively movable components, said first die having a continuous fully open central passage extending longitudinally therethrough, and a plurality of lobes projecting radially inwardly into said central passage from spaced apart locations along the length of the inside, opposite side walls of said central passage in interleaving relation to each other to form a convoluted passage through which said first thermoplastic resin material flows;b. introducing a plurality of continuous lengths of reinforcing fiber strands into said first die central passage at different locations therein simultaneously while said mass of first thermoplastic resin in a flowable state is extruded thereinto;c. separately passing each of said fiber strands longitudinally within and along the length of said central passage over and between said interleaving lobes in the presence of said mass of first thermoplastic resin material to thoroughly contact and impregnate each of said fiber strands with said first thermoplastic resin material to produce a long fiber reinforced composite structure;d. continuously withdrawing the long fiber reinforced composite structure from said first die longitudinally thereto, wherein the long fiber reinforced composite structure is characterized as containing continuous fiber strands imbedded and extending in said first thermoplastic resin material generally parallel to the longitudinal axis of the structure;e. continuously extruding a mass of a second thermoplastic resin material and an additive material to produce a second thermoplastic resin-additive material, wherein said second thermoplastic resin-additive material is in a flowable state having no discrete shape, into and longitudinally through an elongated, second stationary die having no relatively movable components, said second stationary die having a continuous, fully open central passage extending longitudinally therethrough to form a passage through which said second thermoplastic resin-additive material flows;f. continuously conveying the long fiber reinforced composite structure into and through said second die central passage simultaneously while said second thermoplastic resin-additive material is extruded thereinto;g. contacting and coating the long fiber reinforced composite structure with the second thermoplastic resin-additive material to produce a coated, long fiber reinforced composite structure, wherein the first and second thermoplastic resin materials are bonded at the first and second thermoplastic resin material interface;h. continuously withdrawing the coated, long fiber reinforced composite structure from the second die; andi. cutting the coated, long fiber reinforced composite structure into pellets,wherein the temperature of the first stationary die is sufficient to melt and impregnate the first thermoplastic resin material onto the continuous length of reinforcing fiber strands.