METHOD FOR PRODUCING PROPYLENE-BASED BLOCK COPOLYMER

PROBLEM TO BE SOLVED: To provide a method for producing a propylene-based block copolymer as a reactor TPO, which has extremely low crystallinity, forms polymer particles having high flowability, easy handleability and no stickiness and has excellent transparency and a high balance between flexibili...

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Hauptverfasser:	TERADA TOITSU, KOZAI HAGUMU, MIYABAYASHI TAKAYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for producing a propylene-based block copolymer as a reactor TPO, which has extremely low crystallinity, forms polymer particles having high flowability, easy handleability and no stickiness and has excellent transparency and a high balance between flexibility and heat resistance.SOLUTION: The method for producing a propylene-based block copolymer by multi-step polymerization includes: producing a crystalline polypropylene component (A) by a first process for polymerizing a propylene-based monomer in the presence of a metallocene catalyst (M) and an organoaluminum compound (C); and then producing a propylene-based elastomer component (B) by a second process for adding at least one kind of reaction products (E) of an active hydrogen-containing compound (D) and an organoaluminum compound (C') to it and performing polymerization.