PRODUCTION OF ETHYLENE-PROPYLENE BLOCK COPOLYMER

PURPOSE:To provide a production method for stably polymerizing an ethylene- propylene block copolymer capable of forming a molding excellent in visual appearance, elongation and impact resistance. CONSTITUTION:A method for production of an ethylene-propylene block copolymer comprising the steps of (...

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Bibliographic Details
Main Authors TAKARA HIROMASA, KAWAMATA SHOZO, EBARA TAKESHI, SASAKI YOSHIZUMI, WAKAMATSU WAKE
Format Patent
LanguageEnglish
Published 19.07.1994
Edition5
Subjects
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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Summary:PURPOSE:To provide a production method for stably polymerizing an ethylene- propylene block copolymer capable of forming a molding excellent in visual appearance, elongation and impact resistance. CONSTITUTION:A method for production of an ethylene-propylene block copolymer comprising the steps of (1) polymerizing propylene homopolymer in the presence of a catalyst system composed of (A) solid catalyst components containing magnesium, titanium and a halogen as the essential components, (B) an organoaluminum compound and (C) a silicon compound represented by the general formula R R Si(OR )2 (R is an alicyclic hydrocarbon group. R and R are each a hydrocarbon group); and (2) polymerizing the ethylene- propylene block copolymer in the presence of an additional silicon compound expressed by (C') the general formula R aSi(OR )4-a [R and R are each a 1 to 20C hydrocarbon group. a is 0<=a<=4].
Bibliography:Application Number: JP19930000051