Ausimont

Elf Atochem Italia S.r.l.

Giuseppe Ajroldi

Giandomenico Vita

Mario Miani

Carlo Tavazzani

Francesco Visani

Giovanni Castiglioni

A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a fiber with even further improved tensile strength and modulus.

Process of making multifilament yarns of thermoplastic polymers based on

Multifilament yarns of thermoplastic polymers based on

A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a drawn multifilament yarn with even further improved tensile strength and modulus.

This invention relates to low haze impact-resistant transparent compositions, comprising:

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Milan, Italy

Giuseppe Ajroldi