摘要:
Polyolefins having a wide distribution of molecular weights are prepared in a plural stage process, by initially polymerizing the olefins in the presence of a solvent, hydrogen and a highly active Ziegler type catalyst under pressure, and beneath a gas phase containing an inert gas, to form in the first stage a polymer having a relatively high molecular weight. The polymerization reaction mixture from the first stage is continuously flowed to a second stage reactor. The second stage reactor is maintained at a relatively lower pressure, such that the flow is driven by the higher pressure in the first stage. The second stage is agitated and the polymerization reaction mixture is maintained beneath an atmosphere containing olefins and hydrogen gas. Polymers of relatively low molecular weight are formed in the second stage. The product continuously removed from the second stage contains a polymer having a wide distribution of molecular weight.
摘要:
An olefin is polymerized using a catalyst obtained by contacting (1) at least one of silicon or aluminum dioxide, (2) a compound of the formula ROH wherein R is a hydrocarbon radical having 1 to 20 carbon atoms, and (3) a substance obtained by supporting a titanium or a vanadium compound on a magnesium or manganese halide.
摘要:
According to the present invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of a catalyst consisting of a solid component and an organometallic compound component, characterized in that said solid component is obtained by copulverizing(1) a magnesium halide and/or a manganese halide,(2) an aromatic hydrocarbon,(3) a tetravalent titanium compound, and(4) a trivalent titanium compoundAnd in that said organometallic compound component is a mixture of(5) a trialkylaluminum and(6) a compound represented by the general formula AlR.sub.n X.sub.3-n wherein R is alkyl having 1 to 10 carbon atoms and may be the same or different, X is halogen and O
摘要:
According to the present invention, there is provided a process for preparing polyolefins which comprises polymerizing or copolymerizing olefins using as catalyst a component consisting of a solid carrier and a titanium compound and/or a vanadium compound supported thereon, and an organometallic compound, said solid carrier consisting of a product obtained by mixing and heating an aluminum oxide and an ammonium sulfate.
摘要:
Provided is an olefin-polymerization catalyst comprising the combination of the following components [I] and [II]:[I] a solid component obtained by intercontacting and reacting the following components (1) through (4):(1) a compound obtained by treating an oxide of an element of Groups II-IV in the Periodic Table with a compound represented by the general formula R.sup.1.sub.m Si(OR.sup.2).sub.n.sup.X.sub.4-m-n wherein R.sup.1 and R.sup.2 are each a hydrocarbon radical having 1 to 24 carbon atoms, a hydrocarbon radical containing oxygen, sulfur or nitrogen, or hydrogen, X is a halogen atom, m is 0.ltoreq.m
摘要:
This invention provides a process for preparing polyolefins using a new catalyst. According to this invention, .alpha.-olefins can be polymerized or copolymerized to have good stereoregularity and at a high activity by the use of such new catalyst. The new catalyst used in this invention consists of [A] a solid component obtained by contacting (1) a magnesium oxide, (2) an aluminum trihalide, (3) a hydroxy compound represented by the general formula ROH wherein R is an organic radical having 1 to 20 carbon atoms and (4) a titanium halide and/or an addition product of a titanium halide and an aromatic carboxylic acid ester, and [B] an organometallic compound and/or an addition product of an organometallic compound and an aromatic carboxylic acid ester; or it consists of the solid component of the above [A], the organometallic compound and/or the addition product of an organometallic compound and an aromatic carboxylic acid ester of the above [B], and [C] an aromatic carboxylic acid ester. The said catalyst is prepared, in one of the most preferred embodiments thereof, by using the solid component of the above [A] which is obtained by first co-pulverizing the compounds of the above (1),(2) and (3), then washing the co-pulverized product with an aromatic compound, separating the liquid phase to give a solid substance (a) and contacting the latter with the compound and/or the addition product of the above (4).
摘要:
The present invention discloses improved catalysts for polymerizing or copolymerizing olefins and a process for the production of polyolefins comprising a polymerization or copolymerization of olefins by the use of said catalysts. According to the invention there is provided a process for the production of polyolefins by polymerizing or copolymerizing olefins using as the catalyst a solid component containing a titanium compound and/or a vanadium compound and an organometallic compound, said solid component comprising a substance obtained by co-pulverizing (1) a metal halide selected from the group consisting of magnesium halides and manganese halides, (2) a compound represented by the general formula Mg(OR).sub.n X.sub.2-n in which n is a number of the range 0
摘要:
This invention provides a method for the preparation of polyolefins by polymerizing or copolymerizing an olefin or olefins in the presence of a catalyst composed of a titanium compound and/or vanadium compound component supported on a solid carrier and an organometallic compound component, said solid carrier comprising a reaction product obtained by reacting (1) an aluminum compound represented by the general formula Al(OOCR)(OR').sub.2 wherein R and R' being the same or different each represent alkyl, aryl or aralkyl and (2) a magnesium compound represented by the general formula Mg(OR').sub.2 where R" being the same as or different from R and/or R' is alkyl, aryl or aralkyl at a molar ratio of (1):(2) of substantially at least 2:1.
摘要:
Provided is a carrier for an olefin polymerization catalyst which carrier comprises a substance obtained by adding a liquid organic compound not dissolving a magnesium halide into a liquid medium having dissolved therein a substance which contains the magnesium halide as at least one component, the liquid medium further containing an oxide of Group II-IV metal or metals in the Periodic Table, followed by cooling to a temperature not higher than 0.degree. C. and subsequent heat treatment at a temperature in the range of 40.degree. to 200.degree. C.
摘要:
The present invention relates to a process for preparing polyolefins using an improved polymerization catalyst. According to the invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins using a catalyst prepared from a component with a titanium compound and/or a vanadium compound supported on a solid carrier and an organoaluminum compound and/or an organozinc compound, said solid carrier comprising a member selected from the group consisting of a reaction product A obtained by reacting (1) an organic carboxylate salt of magnesium and (2) an aluminum compound represented by the general formula Al(OR).sub.3 wherein R may be same as or different from each other and each R is an organic radical containing from 1 to 20 carbon atoms under such a condition that the aluminum compound is present in excess of a (2):(1) molar ratio of at least 1.6:1 and a reaction product B obtained by treating said reaction product A with a halogenating agent.