Propylene block copolymer and resin composition

• Main Authors: SUGANO TOSHIHIKO, SEKI MOTOHIRO, NAKANO HIROSHI, SUZUKI TORU, SANO HIRONARI, TAYANO TAKAO
• Format: Patent
• Language: English
• Published: 22.10.2002
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A block copolymer is provided comprising one or more blocks of a propylene polymer (PP) and one or more blocks of an ethylene-propylene copolymer (EPR) having the properties:(1) the interface thickness of the PP block with EPR block is from 20-1000 nm;(2) the weight average molecular weight of the PP block is 10,000-1,000,000;(3) the proportion of mesopentad chain in the PP block is not less than 95%;(4) the particle diameter of the disperse phase in EPR block is 0.2-3 microns;(5) the weight average molecular weight of the EPR block is 50,000-1000,000;(6) the propylene content in the EPR block is 20-80 mole %;(7) the composition fluctuation in molecular weight in EPR block is within +/-5% from the average composition.