Abstract: A process for producing a polyolefin-based resin composition comprises, in the first polymerization stage, polymerizing an &agr;-olefin having 4 to 20 carbon atoms, a styrene or a cyclic olefin in the presence of a specific catalyst and, in the second polymerization stage, copolymerizing the obtained polymer with an &agr;-olefin having 2 to 20 carbon atoms, a styrene or a cyclic olefin in the presence of a polyene. A polypropylene composition has a branching parameter a and a branching index g in specific ranges. The curve showing the change in viscosity under elongation with time, the degradation parameter D or the content of a high molecular weight component is specified. The polyolefin-based resin composition exhibits excellent uniformity and improved workability in melting due to improved tension in melted condition. The polypropylene composition exhibits excellent melting elasticity and secondary workability and provides foamed molded articles, sheets and blow molded articles.

Abstract: Provided are an aluminium-oxy compound obtained through reaction of an organoaluminium compound with water, which is soluble in hydrocarbon solvents and in which the amount of the organoaluminium compound remaining is at most 10% by weight; a carrier comprising the aluminium-oxy compound and an inorganic compound; and a catalyst component for olefin polymerization comprising the carrier and a transition metal compound. The catalyst component for olefin polymer production comprises the aluminium-oxy compound and gives polyolefins with good polymer morphology.

Abstract: The present invention provides a polyolefin-based resin composition, comprising (A) a polyolefin I produced from at least one monomer selected from the group consisting of &agr;-olefins, cyclic olefins and styrenes; (B) a polyolefin II produced from said at least one monomer, which differs in composition or properties from said polyolefin I; and (C) a graft copolymer produced by bonding said polyolefins I and II to each other through a polyene, wherein (a) a ratio [(1/R1)/(1/R1)0] of a relaxation velocity (1/R1) of a long-term relaxation component measured by a solid 1H-NMR method about the composition to a relaxation velocity (1/R1)0 of a long-term relaxation component measured by a solid 1H-NMR method about a resin mixture of only the components (A) and (B) is 1.01 or higher; and (b) an intrinsic viscosity [&eegr;] of the composition is in the range of 0.1 to 10 deciliter/g as measured in decalin at 135° C.

Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Abstract: Provided are a propylene homopolymer in which a melt tension (MT), a Z average molecular weight (Mz) and a melt index (MI) (g/10 minutes) are specifically related and in which a difference in eluting temperatures and a maximum eluting temperature in programmed temperature fractional chromatography and a propylene copolymer in which a comonomer is specific &agr;-olefin and a content thereof falls in a specific range and in which a melt tension (MT), a Z average molecular weight (Mz) and a melt index (MI) (g/10 minutes) are specifically related.

Abstract: Disclosed is an ethylenic copolymer having Mw/Mn, as measured through GPC, of from 1.5 to 4, Mw of from 3,000 to 1,000,000, and a resin density of from 0.85 and 0.95 g/cm3. The relationship between the half width at the half maximum [W/2] of the curve as obtained through Gaussian distribution approximation relative to the essential peak of the compositional distribution curve of the copolymer obtained through temperature rising elution fractionation analysis, and the average, n, of short-chain branches existing in the copolymer satisfies an equation, 0.704+0.147n ≦W/2≦−0.055+0.577n. Also disclosed is an ethylenic copolymer having Mw/Mn of from 1.5 to 4 and a resin density of from 0.85 and 0.95 g/cm3.

Abstract: A film formed of an ethylenic copolymer having Mw/Mn of 1.5 to 4, Mw of 3,000 to 1,000,000, and a resin density of 0.85 to 0.95 g/cm3. In the copolymer compositional distribution curve, the relationship between the half width at the half maximum [W/2] of the Gaussian distribution curve, and the average, n, of short-chain branches in the copolymer satisfies the equation, 0.704+0.147n≦W/2≦−0.055+0.577n. The tear strength (TS, kgf/cm) of the copolymer satisfies equations, TS≧131.5−155×log[{(B+C+D)/A}+0.1], and 0.1≦(B+C+D)/A≦1 where A is the area surrounding the Gaussian distribution curve and the base line of the compositional distribution curve; B is the area surrounding the compositional distribution curve, the curve obtained through Gaussian distribution approximation, and the base line, B being at an elution temperature higher than 32° C.

Abstract: There are herein disclosed a branched ethylenic macromonomer which can function as a comonomer to provide a copolymer having excellent molding and working properties and which can be hydrogenated to provide a hydrogenated product as a wax useful in various uses, a copolymer having the excellent molding and working properties obtainable by using this macromonomer as a comonomer, and a branched ethylenic polymer having a low-molecular weight obtainable by hydrogenating the macromonomer.

Abstract: Polyethylenes are disclosed herein which are derived from an ethylene monomer and in which any quaternary carbon atom is not present in a polymeric main chain; and the activation energy (Ea) of melt flow is in the range of 8 to 20 kcal/mol; as well as(1) a Huggins coefficient (k) and an intrinsic viscosity [.eta.] meet the relation of the equationk.gtoreq.0.2+0.0743.times.[.eta.];(2) a molar ratio [CH.sub.3 /CH.sub.2 ] of a methyl group to a methylene group is in a region of 0.005 to 0.1 and meets the equationTm.gtoreq.131-1340[CH.sub.3 /CH.sub.2 ];(3) an Mw and a die swell ratio (DR) meet the equationDR>0.5+0.125.times.log Mw; or(4) in the measurement of a loss elastic modulus, a .beta.-relaxation peak is present in the range of 0 to -100.degree. C.These polyethylenes are different from a usual HDPE, L-LDPE and LDPE, and they are excellent in working properties and permit the control of physical properties such as density, a melting point and crystallinity mainly in the state of a homopolymer.

Abstract: A copolymer having the excellent molding and working properties obtainable by using a branched ethylenic macromonomer and a comonomer selected from the group consisting of ethylene, an .alpha.-olefin having 3 to 20 carbon atoms, cyclic olefins and styrenes. The branched ethylenic macromonomer of the present invention is derivable from ethylene singly or derivable from ethylene and another olefin, (a) a molar ratio of a terminal methyl group/a vinyl group in the macromonomer being in the range of 1 to 100, the macromonomer having a branch other than the branch directly derived from the other olefin, (b) a ratio of vinyl groups to the total unsaturated groups in the macromonomer being 70 mol % or more, (c) a weight-average molecular weight of the macromonomer in terms of a polyethylene measured by a GPC being in the range of 100 to 20,000.

Abstract: Ethylene copolymers are disclosed herein which are each derived from ethylene and an olefin of C.sub.3 to C.sub.20 and in which any quaternary carbon atom is not present in a polymeric main chain; the activation energy (Ea) of melt flow is in the range of 8 to 20 kcal/mol; and (1) a ratio between a Huggins coefficient (k.sup.1) of the copolymer and a Huggins coefficient (k.sup.2) of a straight-chain ethylene polymer having the same intrinsic viscosity meets the equation 1.12<k.sup.1 /k.sup.2 .ltoreq.5, or (2) a molar ratio ?CH.sub.3 /CH.sub.2 ! of a methyl group to a methylene group in a molecular chain is in the range of 0.005 to 0.1, and the equation Tm.gtoreq.131-1,340 ?CH.sub.3 /CH.sub.2 ! is met, or (3) Mw and a die swell ratio (DR) meet the equation DR>0.5+0.125.times.log Mw.

Abstract: An olefin polymer is prepared by homopolymerizing an olefin or copolymerizing two different olefins or an olefin and another polymerizable unsaturated compound in the presence of a polymerization catalyst containing (A) a transition metal compound represented by the formula (I):CpML.sub.x-1 (I)wherein M is a metallic element of Groups 3 to 10 of the Periodic Table or a metallic element of the lanthanide series; Cp is a cyclic compound group having a cyclopentadienyl skeleton of 5 to 30 carbon atoms; L is R', OR', SR', SO.sub.3 R'N'R'R", PR'R", wherein R' and R" are each a C.sub.1-20 hydrocarbon group or a silyl group, NO.sub.2, a halogen atom, a 1-pyrrolyl group or a 1-pyrrolidinyl group, with the proviso that at least one of the L groups is OR', SR', N'R'R" or PR'R", wherein R' and R" are each a C.sub.

Abstract: There are here disclosed a propylene block copolymer comprising (A) 50 to 95 wt % of a specific propylene polymer block which contains a propylene unit or the propylene unit and 4 wt % or less of an olefin unit having 2 to 8 carbon atoms and (B) 50 to 5 wt % of an ethylene-propylene copolymer block containing 20 to 90 wt % of an ethylene unit, 0.001 to 15.0 wt % of a unit derived from a diolefin being contained in at least one of the components (A) and (B), a reduced viscosity at a concentration of 0.05 g/dl measured in decalin at 135.degree. C. being in the range of 0.01 to 30 dl/g; its preparation process; a hydrogenated copolymer obtained from the propylene block copolymer; and a modified copolymer obtained by introducing a functional group into at least 5% of unsaturated bonds of the copolymer.

Abstract: There are herein disclosed an olefin copolymer which comprises an olefin unit and a diolefin unit and in which a weight-average molecular weight is in the range of 200 to 800,000, the content of the diolefin unit is in the range of 0.002 to 30 mol%, and a ratio TUS/DOU between the total content of unsaturated groups observed in a molecular chain (TUS mol%) and the content of the diolefin unit (DOU mol%) is in the range of 0.001 to 200; an olefin graft copolymer obtained by the graft polymerization of this olefin copolymer and an olefin; a hydrogenated olefin copolymer and olefin graft copolymer thereof; and a process for preparing these copolymers.These olefin copolymers are excellent in molding/working properties and have a good thermal stability, transparency and uniformity. Therefore, they are useful as a high-performance VLDPE, LDPE, L-LDPE and HDPE, and further useful as a novel branched propylene polymer, a thermoplastic elastomer, a compatibilizing agent for other resins, and the like.

Abstract: There are disclosed a styrenic copolymer which comprises at least one structural unit represented by the general formula (I) ##STR1## and a structural unit represented by the general formula (II) ##STR2## or a structural unit represented by the general formula (IX) ##STR3## wherein the symbols are each as previously defined in the specification, the structural unit (II) or (IX) being contained in an amount of 0.01 to 99.9 mol %; and a process for the production of the above copolymer.The above styrenic copolymer has a high degree of syndiotactic configuration in the stereoregularity of the main chain of the structural unit (I) as well as adhesivity and compatibility with a resin of a different type.

Abstract: There are disclosed a styrenic copolymer which comprises at least one structural unit represented by the general formula (I) ##STR1## and a structural unit represented by the general formula (II) ##STR2## or a structural unit represented by the general formula (IX) ##STR3## wherein the symbols are each as previously defined in the specification, the structural unit (II) or (IX) being contained in an amount of 0.01 to 99.9 mol %; and a process for the production of the above copolymer.The above styrenic copolymer has a high degree of syndiotactic configuration in the stereoregularity of the main chain of the structural unit (I) as well as adhesivity and compatibility with a resin of a different type.

Abstract: There are disclosed a styrenic block copolymer having a reduced viscosity of 0.01 to 20 dl/g (0.05 g/l in 1,2,4-trichlorobenzene at 135.degree. C.) which comprises highly syndiotactic styrenic-polymer segments and 10.sup.-4 to 10 mol % of heteroatom-containing styrenic polymer segments; a resin composition comprising the above styrenic block copolymer and a thermoplastic resin, an inorganic filler or an organic filler; a multi-layer material comprising at least one layer composed of the above styrenic block copolymer or the above resin composition; and a process for producing the above styrenic block copolymer which comprises polymerizing a styrenic monomer in the presence of a specific catalyst and adding a heteroatom-containing styrenic monomer to successively proceed with copolymerizaiton reaction.

Abstract: There are disclosed a graft copolymer formed by grafting a styrenic monomer onto a high polymer having double bonds in the side chain to constitute highly syndiotactic polystyrenic chain as the graft component, the graft copolymer having a content of graft component of 0.005 to 99% by weight and a reduced viscosity of 0.01 to 30 dl/g as measured at a concentration of 0.05 g/dl in 1,2,4-trichlorobenzene at 135.degree. C. or a melt index of 0.001 to 500 g/10 minutes as measured at 300.degree. C. under a load of 2.16 kg; a process for efficiently producing the above graft copolymer using a catalyst comprising specific components; and a resin composition comprising the above graft copolymer, a highly syndiotactic styrenic polymer or other thermoplastic resin and, when necessary, an inorganic or organic filler. The above graft copolymer and resin composition are excellent in resistance to heat and chemicals, electrical properties, moldability, compatibility, impact resistance, etc.

Abstract: There is disclosed a thermoplastic resin composition which comprises a terminal-modified styrenic polymer having syndiotactic configuration the terminal of which is bonded to a compound having a polar group or a composition of the above terminal-modified styrenic polymer and a terminal-unmodified styrenic polymer having syndiotactic configuration, and an inorganic filler. The composition of the present invention is excellent in resistances to water, impact and heat as well as in mechanical properties and adhesivity with inorganic fillers without impairing the crystallization of the styrenic polymer having syndiotactic configuration.