Polypropylene/propylene-ethylene copolymer composition and process for producing the same

An object of this invention is to provide a polypropylene/propylene-ethylene copolymer composition having an excellent balance among rigidity, toughness, impact resistance, etc. This invention provides a polypropylene/propylene-ethylene copolymer composition having a melt flow rate of from 1 to 80 g...

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Bibliographic Details
Main Authors FUKAZAWA, TOORU, KAWAZOE, SHUNJI, SHIMOMURA, YOZO
Format Patent
LanguageEnglish
Published 11.03.2003
Edition7
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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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Summary:An object of this invention is to provide a polypropylene/propylene-ethylene copolymer composition having an excellent balance among rigidity, toughness, impact resistance, etc. This invention provides a polypropylene/propylene-ethylene copolymer composition having a melt flow rate of from 1 to 80 g/10 min obtained by producing a specific propylene polymer in an amount of from 60 to 95% by weight based on the total amount of the composition to be finally obtained and subsequently producing in a second stage (polymerization step (II)) a specific propylene-ethylene copolymer in an amount of from 5 to 40% by weight based on the total amount of the composition to be finally obtained. A process for producing the composition is also provided.
Bibliography:Application Number: TW19980114292