摘要:
The present invention provides a method for producing homo- and co-polymers of ethylene, or more particularly a method for producing homo- and co-polymers of ethylene in the presence of (a) a solid titanium catalyst produced by means of preparing a magnesium solution by contact-reacting a halogenated magnesium compound with alcohol; reacting thereto an ester compound having at least one hydroxyl group and a silicon compound having at least one alkoxy group; and adding a mixture of a titanium compound and a silicon compound; (b) organometallic compounds of Group II or III of the Periodic Table; and (c) a cyclic nitrogen compound. The catalyst for homo- and co-polymerization of ethylene, produced according to the present invention, is of high activity, and the polymers produced by the method of the present invention by using said catalyst have the advantages of having high bulk density and narrow molecular weight distribution.
摘要:
The present invention provides prepolymerized olefin polymerization catlyst and olefin polymerization method using the same. More particularly, the present invention provides prepolymerized catalyst which is encapsulated with macromolecular monomers produced by adding olefin monomers and polysiloxane compound having a doulble bond in the terminal groups to the solid titanium catalyst for olefin polymerization which is surface treated with silane compounds containing two or more of vinyl groups and then polymerizing them, and a method for producing polyolefin having high melt strength by polymerization by using the catalyst.
摘要:
A catalyst for stereoregular polymerization of α-olefins which is obtained by a method comprising contacting dried particles (a) with an organometallic compound (b), subsequently contacting the resultant particles with a compound (c) which has a functional group having active hydrogen or serving as a non-proton-donating Lewis base and further has an electron-attracting group to obtain modified particles (A), and contacting the particles (A) with a transition metal compound (B) having the ability to stereoregularily polymerize an α-olefin and with an organometallic compound (C); and a process for producing a stereoregular α-olefin polymer which comprises using the catalyst to polymerize an α-olefin.
摘要:
This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted treated solid oxide compound.
摘要:
A process for producing an α-olefin polymer having excellent moldability, i.e., a heightened ME. The process comprises polymerizing an α-olefin using a Ziegler-Natta catalyst, characterized in that the polymerization is conducted at 92°C or higher under such conditions that the hydrogen/α-olefin molar ratio during polymerization and the melt flow rate of the obtained α-olefin polymer as measured at 230°C under a load of 2.16 kg (MFR, g/10 min) satisfy the following general formula (I): log(MFR)≥1.5xlog(hydrogen/α-olefin)+4.5.
摘要:
The invention provides a process for producing polypropylene and/or random copolymers of propylene type using a stereoregular catalyst which comprises a titanium-containing solid catalyst component (A), an organoaluminum compound (B) and if required an organosilicon compound (C), wherein
[I] before carrying out homopolymerization of propylene or random copolymerization of propylene with an α-olefin other. than propylene, the above component (A), an organoaluminum compound (B') and if required an organosilicon compound (C') are used, and a small amount of propylene or ethylene and/or an α-olefin of 4 - 20 carbon atoms for pre-activation treatment is supplied to the above component (A), and [II] a catalyst which is prepared by adding an organosilicon compound (C") to the pre-activated stereoregular catalyst in a molar ratio of 0.1 - 50 as Si/Ti, is used to produce polypropylene (propylene homopolymer) or propylene random copolymers (propylene-α-olefin random copolymers) with lesser formation of lump and string-like irregular shape polymers.