Ethylene/butene-1 copolymers
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United States of America Patent
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Jan 28, 1992
Issued Date -
N/A
app pub date -
Nov 20, 1990
filing date -
Aug 2, 1978
priority date (Note) -
Expired
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Abstract
Crystalline copolymers of ethylene and alpha-olefins CH.sub.2 .dbd.CHR in which R is an alkyl group having 2 to 8 carbon atoms, containing 0.5 to 3% by moles of polymerized alpha-olefin and having a density lower than 0.945 g/cc are obtained by polymerizing, in the gas phase, mixtures of ethylene and the alpha-olefins in contact with catalysts prepared from (1) Ti compounds supported on Mg halides and (2) organometallic compounds, which are active in the polymerization of ethylene but exhibit little, if any, activity in the homo- or copolymerization of the alpha-olefins.
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