Perfectionnements concernant la préparation de matières filamenteuses

An exclusively or predominantly isotactic molten polymer of an alpha-olefine having an intrinsic viscosity of 0.3-2.0 is homogenized for 1-5 minutes, filtered at 20-150 DEG C. above its melting point, subsequently further filtered at a temperature not more than 60 DEG C. above its melting point and...

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Bibliographische Detailangaben
Hauptverfasser:	MARAGLIANO DOMENICO, DENTI FRANCO
Format:	Patent
Sprache:	fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS NATURAL OR ARTIFICIAL THREADS OR FIBRES PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPINNING TEXTILES TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	An exclusively or predominantly isotactic molten polymer of an alpha-olefine having an intrinsic viscosity of 0.3-2.0 is homogenized for 1-5 minutes, filtered at 20-150 DEG C. above its melting point, subsequently further filtered at a temperature not more than 60 DEG C. above its melting point and finally extruded into filaments. A polymer having the specified intrinsic viscosity may be prepared conventionally or by thermal degradation of one which has an intrinsic viscosity greater than 2. The homogenizing step may be effected partly by mechanical means. The alpha-olefine may be propylene. To prevent undesired thermal degradation of the polymer, stabilizers, e.g. dibutyl tin dibutyl mercaptide or triphenyl phosphite, may be added. Examples are given.