ETHYLENE POLYMER COMPOSITION, MANUFACTURING METHOD THEREFOR, AND MOLDED ARTICLE OBTAINED USING SAME

• Main Authors: SUGIYAMA, KAZUTO, MORITA, ATSUSHI, KAI, YASUHIRO, SUGIMURA, KENJI, KUBO, MINEO
• Format: Patent
• Language: English; French; Japanese
• Published: 01.07.2010
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, ORYARNS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MECHANICAL FINISHING OF YARNS OR ROPES; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; SPINNING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; WARPING OR BEAMING; YARNS; YARNS OR THREADS

Provided is an ethylene polymer composition which can be obtained with a solid-phase method such as solid-phase stretch forming, is suitable for producing a molded article having high strength, and has the following properties. This ethylene polymer composition is comprised of (a) an ethylene polymer with a limiting viscosity [?] of not less than 2 dL/g and not more than 20 dL/g and (b) an ethylene polymer with a limiting viscosity [?] of more than 35 dL/g but not more than 50 dL/g, with the mass ratio (a)/(b) = 0/100 to 50/50 and the [?] for the entire composition being more than 30 dL/g but not more than 50 dL/g. The method for manufacturing said ethylene polymer composition includes, for example, the polymerization of an ethylene-containing olefin under specific conditions using a catalyst for olefin polymerization which contains a solid titanium catalyst component which contains magnesium, halogen, and titanium. La présente invention concerne une composition de polymère d'éthylène qui peut être obtenue par un procédé en phase solide tel qu'un formage par étirage en phase solide, et qui convient pour fabriquer un article moulé de haute résistance. Cette composition est constituée par (a) un polymère d'éthylène avec une viscosité limite (?) comprise entre 2 dl/g et 20 dl/g inclus, et (b) un polymère d'éthylène avec une viscosité limite (?) supérieure à 35 dl/g et inférieure ou égale à 50 dl/g, le rapport massique (a)/(b) valant 0/100 à 50/50 et la viscosité (?) de la composition complète étant supérieure à 30 dl/g et inférieure ou égale à 50 dl/g. L'invention concerne également un procédé de fabrication de ladite composition de polymère d'éthylène qui consiste par exemple à polymériser une oléfine contenant de l'éthylène dans des conditions spécifiques à l'aide d'un catalyseur de polymérisation d'oléfines qui comporte un composant catalyseur au titane solide comprenant du magnésium, un halogène et du titane.