Abstract: 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.

Abstract: The present invention provides an olefin polymerization catalyst component comprising a transition metal compound represented by general formula (1) LmCpnMX1X2  (1) an olefin polymerization catalyst containing the catalyst component as a transition metal component, and a method of producing a polyolefin using the catalyst. According to the present invention, polyolefins having a wide molecular weight distribution and excellent moldability and containing small amounts of low molecular weight components can be produced with high activity.

Abstract: Disclosed are a catalyst for polymerizing olefins containing a solid catalyst component containing titanium, magnesium and halogen as essential components (component (A)); an organic aluminum compound (component (B)); and a silane compound (component (C)) represented by general formula (1) wherein R1 and R2 independently represent a straight, branched or cyclic saturated aliphatic hydrocarbon group or a silyl group, a method of preparing polyolefins using the catalyst as well as novel trimethoxysilane compounds represented by the general formula (1) in which R1 is a straight saturated aliphatic hydrocarbon group having 2 to 10 carbon atoms, and R2 represents a methyl group. Use of the catalyst enables efficient production of polyolefins having a low molecular weight (MFR>20 (g/10 minutes)), a broad molecular weight distribution (MLMFR/MFR>22) and a high stereoregularity when applied to polymerization of olefins having 3 or more carbon atoms.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A catalyst for olefin polymerization comprising: (A) a solid catalyst component comprising a titanium compound, a magnesium compound, and a halogen compound; (B) an organoaluminum compound; (C) a first organosilicon compound represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrocarbon group having 1 to 4 carbon atoms; R.sup.2 represents a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom; R.sup.3 and R.sup.4 each represent a hydrocarbon group having 1 to 6 carbon atoms; and R.sup.2, R.sup.3, and R.sup.4 may be the same or different; and (D) a second organosilicon compound represented by formula (II): ##STR2## wherein R.sup.5 represents a hydrocarbon group having 1 to 4 carbon atoms; and R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom.

Abstract: Disclosed are a catalyst for polymerizing olefins containing a solid catalyst component containing titanium, magnesium and halogen as essential components (component (A)); an organic aluminum compound (component (B)); and a silane compound (component (C)) represented by general formula (1) ##STR1## wherein R.sup.1 and R.sup.2 independently represent a straight, branched or cyclic saturated aliphatic hydrocarbon group or a silyl group, a method of preparing polyolefins using the catalyst as well as novel trimethoxysilane compounds represented by the general formula (1) in which R.sup.1 is a straight saturated aliphatic hydrocarbon group having 2 to 10 carbon atoms, and R.sup.2 represents a methyl group. Use of the catalyst enables efficient production of polyolefins having a low molecular weight (MFR>20 (g/10 minutes)), a broad molecular weight distribution (MLMFR/MFR>22) and a high stereoregularity when applied to polymerization of olefins having 3 or more carbon atoms.

Abstract: 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.

Abstract: 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.

Abstract: Solid catalyst components for olefin polymerization which comprise a solid carrier components comprising a solid substance having the general formulaMgX.sub.2.(E).sub.n ( 1)wherein X is a halogen atom, E is a monoether compound and n is 0.01.about.4, at least a portion of said E being replaced by an eletron donative compound different from said monoether compound (E), and a titanium compound and these catalyst components can produce an olefin polymer having a high stereoregularity in a high polymer yield per unit of a catalyst component in olefin polymerization.

Abstract: 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).

Abstract: A catalyst for olefin polymerization comprising: (A) a solid catalyst component comprising a titanium compound, a magnesium compound, and a halogen compound; (B) an organoaluminum compound; (C) a first organosilicon compound represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrocarbon group having 1 to 4 carbon atoms; R.sup.2 represents a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom; R.sup.3 and R.sup.4 each represent a hydrocarbon group having 1 to 6 carbon atoms; and R.sup.2, R.sup.3, and R.sup.4 may be the same or different; and (D) a second organosilicon compound represented by formula (II): ##STR2## wherein R.sup.5 represents a hydrocarbon group having 1 to 4 carbon atoms; and R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom.

Abstract: 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.

Abstract: 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.

Abstract: A thermally reversible crosslinked resin composition comprising a specific ethylenic copolymer, a specific polyhydric alcohol and a specific reaction promoter and a molded article produced by utilizing the resin composition are disclosed. Because the resin composition and the molded article have a high reaction rate of dissociation of the crosslinking during heating and a high reaction rate of formation of the crosslinking during cooling, they can be utilized for various applications, such as melt molding and the like, as the the thermally reversible crosslinked resin composition and the thermally reversible crosslinked molded article which are substantially valuable for commercial application.

Abstract: 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.

Abstract: 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.

Abstract: A laminate suitable for use as wrapping or packaging materials for foods and industrial materials is disclosed, which is produced by laminating a thermoplastic resin composition which comprises (1) 10 to 95 % by weight of an ethylene copolymer composed mainly of units derived from ethylene and units derived from an unsaturated carboxylic acid anhydride and (2) 70 to 5 % by weight of a flexible resin having an MFR (190.degree. C.) of 0.1 to 1,000 g/10 min, to one or more kinds of substrates selected from thermoplastic resins, metals, papers, and fabrics. A process for efficiently producing the laminate is also disclosed.