US 5,310,600 A · Fiber reinforced polyamide resin composite material and method of manufacture thereof

Abstract

A fiber reinforced polyamide resin composite material is suitable for use as a molding material. A liquid lactam added with an anionic polymerization catalyst and another liquid lactam added with an activator are supplied to an impregnation chamber while being mixed together at a predetermined or selected ratio. In the impregnation chamber, long reinforcing fibers are impregnated with the mixed liquid to form a strand. Then a coating layer of thermoplastic resin is continuously formed all over the outer peripheral surface of the strand, after which the strand is introduced into a heated polymerization chamber for anionic polymerization of the mixed liquid in the reinforcing fibers. The strand is cut into pellets of a predetermined or selected length after or without removing the coating layer. The composite material manufactured by this method has a high adhesive strength between the reinforcing fibers and the resin and provides excellent physical properties to ultimate moldings.

Claims8

Dependent claims

A method for the manufacture of a fiber reinforced polyamide resin composite material, said method comprising the steps of:

supplying to an impregnation chamber a liquid lactam added with an anionic polymerization catalyst and a liquid lactam added with an activator while mixing them together at a selected ratio;
forming a strand by continuously supplying long reinforcing fibers into said impregnation chamber and therein impregnating the mixed liquid of said lactams into said reinforcing fibers;
introducing said strand through a tubular nipple into a coating head portion of a melt extruder to form all over the peripheral surface of said strand a continuous coating layer of a thermoplastic resin extruded from said coating head portion, the thermoplastic resin having a softening point higher than 120.degree. C.;
introducing the thus coated strand into a polymerization chamber and therein conducting anionic polymerization of said lactams in said reinforcing fibers inside of said coating layer;
and
cutting the thus polymerized strand into a selected length.

3 more elements

Dependencies are inferred from the claim text.

Fiber reinforced polyamide resin composite material and method of manufacture thereof

Life of this patent

Fiber reinforced polyamide resin composite material and method of manufacture thereof

Life of this patent

Abstract

Claims8