INTERIOR PARTS FOR VEHICLES MOULDED FROM MODIFIED POLYPROPYLENE

Polypropylene interior parts for autocars having overcome the drawback of their permanent bulge or secondary deformation due to high temperature exposure is provided, which parts are obtained by molding a material comprising a propylene-ethylene block copolymer prepared by polymerizing propylene at...

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Bibliographic Details
Main Authors KENJI IWAI, TERUO KAWASAKI, KINYA MORI, KIYOAKI SUZUKI, MASAHIRO TAMAMUSHI, HIROYOSHI ASAKUNO, MAMORU NISHIDA
Format Patent
LanguageEnglish
Published 15.01.1986
Edition4
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
MOTOR VEHICLES
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRAILERS
TRANSPORTING
VEHICLES IN GENERAL
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
WORKING-UP
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Summary:Polypropylene interior parts for autocars having overcome the drawback of their permanent bulge or secondary deformation due to high temperature exposure is provided, which parts are obtained by molding a material comprising a propylene-ethylene block copolymer prepared by polymerizing propylene at a first stage so that the resulting propylene homopolymer can have a relation between its isotactic pentad ratio (P) and MFR of 1.00>/=P>/=0.015 log MFR+0.955 and can occupy 70 to 95% by weight of the total polymerization quantity, followed by polymerizing ethylene or ethylene and propylene in 30 to 5% by weight of the total polymerization quantity at at least one stage, so as to give an ethylene content occupying 3 to 12% by weight of the total polymerization quantity.
Bibliography:Application Number: GB19850017354