Hoechst Aktiengesellschaft

Karin Mehmke

Detlef H Skaletz

Horst Heckel

Ludger Czyborra

An injection molding which is built up from a thermoplastic material and glass fibers where the glass fibers have a fiber length of at least 5 mm and are present in an amount of 2 to 8% by weight, based on the total weight of the glass fibers and thermoplastic material. The injection molding has an impact strength at 23.degree. C. of at least 170 kJ/m.sup.2 and an impact strength at -30.degree. C. of at least 140 kJ/m.sup.2. The injection molding material is distinguished by a significant improvement in its impact strength, together with an increased heat resistance compared with injection moldings of simple thermoplastic materials which are not reinforced with fibers.

Injection molding of thermoplastic material including from 2 to 8% by

A thermoformable, fiber-reinforced composite material contains 5 to 70% by volume of unidirectionally aligned reinforcing fibers having individual filament diameters of 7 to 30 .mu.m, which are bonded by a matrix of a thermoplastic elastomer-modified polypropylene which essentially wets the entire surface of the individual filaments. The elastomer-modified polypropylene preferably consists of a mixture of polypropylene with thermoplastic ethylene-propylene-diene rubber (EPDM) and/or ethylenepropylene rubber (EPM). The reinforcing fibers preferably consist of glass.

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Karin Mehmke