摘要:
A blow-moldable or extrudable ethylene polymer having an excellent moldability which gives a molded product free of roughened surface, having: a number-average molecular weight Mn (V1) as determined from the amount of a terminal vinyl group by .sup.13 C-NMR measurement with respect to a fraction having a number-average molecular weight Mn of 100,000 according to GPC; and a number-average molecular weight Mn (V2) as determined from the amount of a terminal vinyl group by .sup.13 C-NMR measurement with respect to a fraction having a number-average molecular weight Mn of 10,000 according to GPC, Mn(V1) and Mn(V2) satisfying the following relationship:1.01.ltoreq.log.sub.10 {Mn(V1)/Mn(V2)}.ltoreq.3.0and having a melt flow rate (HLMFR) of from 0.1 to 70 g/10 min.
摘要:
A polymerization catalyst which exhibits a high activity and a good hydrogen response and thus is suitable for the production of an ethylene polymer having a wide molecular weight range can be obtained by a method using a chromium compound, an organic aluminum compound and a carrier and comprising the following steps (a) to (d): (a) contacting a chromium compound with a carrier in the presence or absence of a solvent; (b) adding an organic aluminum compound to said contacted substances at a temperature of not higher than 60° C. in an amount such that the mixing ratio of said organic aluminum compound to said chromium compound falls within the range of from 0.5/1 to 100/1 as calculated in terms of the ratio of aluminum atom/chromium atom (Al/Cr molar ratio) and that the following relationship (1) is satisfied: log10t≦0.33log10C+0.35 (1) wherein t represents the time (min) required until the organic aluminum compound is added to give an Al/Cr molar ratio of 10/1; and C represents the amount of the carrier used (Kg); (c) after the addition of the organic aluminum compound, stirring at a temperature of from 0° C. to 60° C. for 0.5 to 4 hours; and (d) removing the solvent used, unreacted matters and by-products at a temperature of not higher than 60° C. in such a manner that the following relationship (2) is satisfied: log10T≦0.23log10C+1.10 (2) wherein T represents the time required until the removal is completed; and C represents the amount of the carrier used (Kg).
摘要:
A process for the production of ethylenic polymers is disclosed in which an ethylenic monomer is polymerized in the presence of a catalyst comprising a chromium compound, an alumoxane and an organometallic alkoxide and/or organometallic siloxide and a carrier supporting thereon these compounds. The resultant polymer has a balanced proportion of rigidity and environmental stress cracking resistance (ESCR) and an excellent moldability property.
摘要:
An ethylenic polymerization catalyst comprising (A) a chromium compound, (B) a carrier, (C) aluminoxane, and (D) a transition metal compound comprising a group having conjugated .pi. electron as a ligand, wherein said chromium compound (A) is not calcined; and a process for producing an ethylenic polymer comprising a step of polymerizing a monomer comprising ethylene in the presence of the ethylenic polymerization catalyst.
摘要:
A metallocene having an asymmetric ligand which is represented by the formula below and its enantiomer: ##STR1## and a process for producing a polyolefin using the same as a catalyst component. The metallocene and its enantiomer are particularly effective in the production of highly stereospecific polyolefins.
摘要:
A metallocene having an asymmetric ligand which is represented by the formula below and its enantiomer: ##STR1## and a process for producing a polyolefin using the same as a catalyst component. The metallocene and its enantiomer are particularly effective in the production of highly stereospecific polyolefins.
摘要:
Ionic compounds represented by general formula (I), method of their production, olefin polymerization catalyst components, and olefin polymerization catalysts containing the components are provided.�M(R.sup.1).sub.k (R.sup.2).sub.1 (R.sup.3).sub.m (R.sup.4 -L).sub.n !.sup.- �D!.sup.+ (I)(wherein, M is an element belonging to the Group 13; R.sup.1, R.sup.2 and R.sup.3 are pentafluorophenyl, etc., R.sup.4 is a substituted phenylene group, etc., k, l and m being each 0 or an integer of 1 to 3, and n being an integer of 1 to 4 such that k+l+m+n=4; L is trichlorosilyl, methyldichlorosilyl, dimethylchlorosilyl group, etc.; and D is a monovalent cation). The catalyst of this invention, which is used in combination with the ionic compound of this invention, a carrier, an organometal compound and a Group 4, 5 or 6 transition metal compound, has high activity so that polymerization of olefins by a slurry process, a gas phase process or the like using the catalyst gives rise to a polymer having good powder characteristics and attachment of the polymer to the reactor is minimized.
摘要:
A catalyst component for polyolefin production catalysts comprising a metallocene compound represented by general formula (1) (symbols have the meanings as described in the specification), polyolefin production catalyst containing the component, and method for producing polyolefin with the catalyst are provided. Use of a catalyst containing the novel metallocene compound as a catalyst component of the invention in polymerization of .alpha.-olefin, particularly propylene, enables one to prepare high rigid, high melting point isotactic polypropylene useful as an industrial material for automobiles and the like, more specifically isotactic polypropylene having highly controlled stereoregulartity and regioregularity, particularly the one having a high regioregularity that has been difficult to achieve with conventional metallocene catalysts. ##STR1##
摘要:
A 3-alkoxypropionic ester derivative, an olefin polymerization solid catalyst component using the same, an olefin polymerization catalyst using the same, and a process for the preparation of a polyolefin using the same. The 3-alkoxypropionic ester derivative is represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrocarbon group having from 1 to 10 carbon atoms; R.sup.2 represents a hydrocarbon group having from 1 to 20 carbon atoms; R.sup.3 represents a hydrocarbon group having from 1 to 20 carbon atoms; and R.sup.4 represents a branched hydrocarbon group having 3 or more carbon atoms.
摘要翻译:3-烷氧基丙酸酯衍生物,使用其的烯烃聚合固体催化剂组分,使用该烯烃聚合固体催化剂组分的烯烃聚合催化剂,以及使用其制备聚烯烃的方法。 3-烷氧基丙酸酯衍生物由式(I)表示:其中R 1表示具有1至10个碳原子的烃基; R2表示碳原子数为1〜20的烃基; R3表示碳原子数为1〜20的烃基; R 4表示碳原子数3以上的支链状烃基。
摘要:
A catalyst component for producing polyolefin, a catalyst for producing polyolefin using the catalyst component, and a process for producing polyolefin in the presence of the catalyst. The catalyst component comprises a metallocene compound represented by formula (1): ##STR1## All the symbols in formula (1) are defined in the description.