KR937000558A - Polyolefin production method having bimodal molecular weight distribution - Google Patents

Abstract

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Description

Polyolefin production method having bimodal molecular weight distribution

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Claims (13)

A method of producing a polyolefin having a bimodal molecular weight distribution consisting of: (A) under polymerization conditions, (1) at least two different alpha olefins, and (2) a catalyst system consisting of: (a) at least one aluminoxane compound, and (b) mono, di, or tri At least one metal of a metal that is cyclopentadienyl, substituted cyclopentadienyl, or mixtures thereof, titanium, vananium, chromium, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, or mixtures thereof Rosene Compounds Only at least one of the metallocene compounds used has the ability to form essentially the homopolymer with the alpha-olepin in the presence of hydrogen, and furthermore to form a copolymer with the alpha-olefins in the absence of hydrogen. After the formation of the first polymerization mixture, (B) under the polymerization conditions, (1) the first polymerization mixture and (2) hydrogen are contacted to form a second polymerization mixture. The method of claim 1, wherein the metallocene is a metallocene of titanium and at least one metallocene of the metal is present. The method according to claim 1 or 2, wherein the first polymerization mixture is composed of low crystallinity, high molecular weight copolymer, and the second polymerization mixture is low crystallinity, high molecular weight copolymer, and high crystallinity, A method consisting of a low molecular weight homopolymer. The method according to any one of claims 1-3, wherein the polymerization conditions consist of slurry phase polymerization conditions. The method of claim 4, wherein the slurry phase polymerization conditions are comprised at a temperature of about 80 ° C. to about 110 ° C. 6. 6. The method of claim 4 or 5, wherein the slurry phase polymerization conditions consist of pressures between about 250 and about 700 feet. 7. The method of claim 4, wherein the slurry phase polymerization conditions comprise a polymerization time of about 1 minute to about 6 hours. 8. The method of claim 1, wherein the at least two different alpha-olefins are ethylene, propylene, 1-butene, 3methyl-1-butene, 1-pentene, 3-methyl-1pentene, 4-methyl-1 A pentene, 1-hexene, 3-ethyl-1-hexene, 1-heptene, 1-octene, and 1-decene. The method of claim 8, wherein the at least two different alpha-olefins are ethylene and 1-hexene. The method of claim 9, wherein the first polymerization mixture and hydrogen are further contacted with additional ethylene. The method of claim 1, wherein the aluminoxane compound is methyl aluminoxane. The method of claim 1, wherein the metallocene compound consists of bis (cyclopentadienyl) dimethyl zirconium. The method of claim 12, wherein the metallocene compound additionally consists of bis (cyclopentadienyl) dimethyl titanium. ※ Note: The disclosure is based on the initial application.