PROCESS FOR PRODUCING POLYETHYLENE OF ULTRAHIGH MOLECULAR WEIGHT

A process for producing ultrahigh molecular weight polyethylene having an intrinsic viscosity of 10 - 30 dℓ/g at 135°C in decalin comprises at least the following two polymerization reaction stages: (a) a first reaction stage in which ethylene is polymerized using a catalyst comprising a solid compo...

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Bibliographic Details
Main Authors MATSUURA, KAZUO, YOKOYAMA, SHIGEKI, SANO, AKIRA, KUROISHI, TETSUJIRO, MIYAZAKI, YASUNOSUKE
Format Patent
LanguageEnglish
Published 29.07.1987
Edition4
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:A process for producing ultrahigh molecular weight polyethylene having an intrinsic viscosity of 10 - 30 dℓ/g at 135°C in decalin comprises at least the following two polymerization reaction stages: (a) a first reaction stage in which ethylene is polymerized using a catalyst comprising a solid component containing at least Mg, Ti and/or Va and an organometallic compound and in the absence of hydrogen or its presence at a lower concentration to produce 70 - 99.5 weight parts of polyethylene having an intrinsic viscosity of 12 - 32 df/g at 135°C in decalin; and (b) a second reaction stage in which a fresh feed of ethylene is polymerized in the presence of hydrogen at higher concentration to produce 30 - 0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1 - 5 df/g at 135°C in decalin. Such UHMW polyethylene has improved moldability characteristics.
Bibliography:Application Number: EP19850309027