Abstract: An impact copolymer having a flexural modulus (ASTM D-790) of at least about 1,100 MPa; a melt flow rate (ASTM D-1238) of at least about 15 g/10 min; and a maximum load under Dynatup Impact test (ASTM D-3763) of equal to or greater than about 1,700 N at a temperature of less than or equal to about ?40° C. and articles of manufacture from same.

Abstract: A problem of the invention is to provide a propylene copolymer which is excellent in adhesion to crystalline propylene-based polymers and which is excellent in solubility and compatibility with polar resins, a process for producing the same, and a composition containing the subject polypropylene copolymer. The invention is concerned with a polypropylene copolymer, which is characterized by having a polymer principal chain (A) derived from a propylene-based polymer having (1) a prescribed requirement as defined by the 13C-NMR spectral measurement and having (2) a melting point [Tm] by a differential scanning calorimeter of not higher than 100° C., or a crystal melting heat of less than 5 J/g; and a side chain containing a polymer chain (B) which is different from the principal chain, with a weight ratio of (A)/(B) being in the range of from 20/1 to 1/20, a composition containing the subject copolymer, and a process for producing the subject copolymer.

Abstract: Disclosed is a glass-filled coupled impact propylene copolymer composition having an improved combination of strength, stiffness, impact properties and melt strength; articles made therefrom; and a process to prepare said articles.

Abstract: A thermoplastic polyolefin having a melt flow rate of 20 dg/min or higher at 230° C. is produced in reactor without visbreaking. By controlling ratio of the weight average molecular weight of the xylene soluble fraction to the weight average molecular weight of the xylene insoluble fraction, a high melt flow thermoplastic polyolefin can be produced having a good balance of impact and stiffness, tensile elongation at break and gloss properties. Optionally, the ratio of the melt flow rate of the homopolymer phase to the melt flow rate of the total thermoplastic polyolefin can also be controlled. By compounding thermoplastic polyolefins according to the current invention with one or more modifiers, additional compositions can be produced having improved resistance to solvents.

Abstract: The invention relates to highly flowable propylene block copolymers that comprise 50 to 80 wt.-% of a propylene homopolymer and 10 to 70 wt.-% of a propylene copolymer having 5 to 50 wt.-% of a C2–C8 alk-1-ene polymerized into it that is different from propylene, and that are obtainable from the gaseous phase by a two-step polymerization by means of a Ziegler-Natta catalyst system. In a first polymerization step, the propylene is polymerized at a pressure of 10 to 50 bar, a temperature of 50 to 100° C. and an average dwelling time of the reaction mixture of 0.3 to 5 hours in the presence of at least 2.0% by volume, based on the total volume, of hydrogen. The propylene homopolymer obtained in said first polymerization step is transferred together with the Ziegler-Natta catalyst system into an intermediate container, expanded for 0.01 to 5 minutes to less than 5 bar and maintained at a temperature of 10 to 80° C.

Abstract: The polyolefin-based resin composition (I) of the present invention comprises (A) 99.9 to 80% by mass of a propylene (co)polymer having (a) a melt flow rate (MFR) of 0.1 to 200 g/10 min, (b) a meso-pentad fraction [mmmm] of an ordinary temperature (25° C.) xylene-insoluble component of 97.0% or higher, and (c) a content of an ordinary temperature (25° C.) xylene-soluble component of 4 to 50% by mass; and (B) 0.1 to 20% by mass of a copolymer containing propylene chains of an isotactic structure, and copolymer chains constituted from at least two monomer units selected from the group consisting of ethylene, C3 to C20 ?-olefins, cyclic olefins and aromatic vinyl monomers which are graft-bonded and/or block-bonded to said copolymer, and exhibits not only a high rigidity but also a highly enhanced impact strength and is well-balanced between the physical properties thereof.

Abstract: A block copolymer having structural formula A-B or A-B-A, wherein A is a crystallizable isotactic polypropylene block segment and B is an amorphous olefin elastomeric block segment; the novel crystallizable block copolymer may be used as it is as a molding material, or as a compatibilizer, a surfactant, a mechanical property improvement agent and the like for other polyemers.

Abstract: The present invention provides an olefin block copolymer for a viscosity index improver capable of preparing a lubricating oil composition having excellent low temperature properties and excellent balance between viscosity and shear stability, a viscosity index improver and a lubricating oil composition comprising the viscosity index improver. The olefin block copolymer has a Mw/Mn of not more than 1.5, and comprises: (i) a polymer block comprising ethylene and an ?-olefin of 3 to 20 carbon atoms, having a molar ratio (ethylene/?-olefin) of ethylene units to ?-olefin units of from 20/80 to 65/35, a Mw of 50,000 to 2,000,000, and having a slope of an intramolecular composition distribution of absolute value of 0.

Abstract: The present invention is directed to a method for producing a copolymer and a copolymer product of the method. The copolymer is prepared by a controlled radical polymerization process, typically an atom transfer radical polymerization process, in which polymerizable alkene monomers are polymerized in the presence of a halogenated polyolefin macroinitiator. The copolymer product of this process is useful in a film-forming composition that adheres strongly to polyolefinic substrates and to which non-polyolefinic film-forming compositions strongly adhere. The copolymer can be applied to a substrate in an adhesion-promoting layer or can be incorporated into a film-forming composition, such as a primer, that contains additional resinous compounds.

Abstract: To provide a propylene based block copolymer that, when used as a molding material, exhibits an extremely good stiffness-impact resistance balance and has good heat resistance and excellent moldability, and therefore, in molding, good appearance is revealed. That is, the invention provides a propylene based block copolymer obtained through a preceding stage step of producing a propylene polymer component (PP) and a subsequent stage step of producing a propylene-ethylene copolymer component (EP) using a metallocene catalyst, wherein the block copolymer satisfies specific requisites.

Abstract: Highly transparent and flexible elastoplastic polyolefin compositions which contain A) 10-20 parts by weight of a propylene homopolymer or copolymer with ethylene and/or one or more CH2?CHR ?-olefins, the copolymer containing at least 95% by weight of propylene; B) 5-20 parts by weight of propylene copolymer fraction containing ethylene and insoluble in xylene at room temperature; and C) 60-80 parts by weight of a propylene copolymer fraction containing a comonomer selected from ethylene and mixtures of ethylene with one or more CH2?CHR ?-olefin and soluble in xylene at room temperature, the fraction containing from 15 to 25% by weight of the comonomer, the percent by weight of the sum of the B and C components with respect to the total polyolefin composition being from 80% to 90%.

Abstract: Disclosed is a propylene-ethylene block copolymer which is superior in stiffness, hardness and moldability and also in balance between toughness and low-temperature impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene random copolymer portion, wherein the propylene-ethylene block copolymer has a melt flow rate (MFR) of from 5 to 120 g/10 min.

Abstract: This invention relates to a thermoplastic resin composition containing: (a) about 85 to about 95 weight % of a crystalline propylene ethylene block copolymer or a combination of crystalline propylene ethylene copolymer and a propylene homopolymer whose (i) ethylene content ranges from about 2.2 to about 4.2 weight %, (ii) melt flow rate ranges from about 20 to about 30 g/10 minutes, and (iii) isotactic/pentad fraction of propylene homopolymer is greater than or equal to about 94%; (b) about 2 to about 8 weight % ethylene butene rubber whose melt flow rate ranges from about 6 to about 8 g/10 minutes and density ranges from about 0.860 to about 0.865 g/cc and (c) about 2 to about 8 parts by weight talc with an average diameter ranging from about 1 to about 2 &mgr;m. The thermoplastic resin composition is lightweight but maintains good rigidity and heat resistance properties. The thermoplastic resin may be molded into an article, such as those used as parts for an automobile interior.

Abstract: A polypropylene/ethylene block copolymer, which has a poly(ethylene-co-propylene) segment content of 5 to 100 wt. %, excluding 100 wt. %, and a total ethylene content of 2 to 95 wt. %. (a) The block polymer comprises polypropylene segments and poly(ethylene-co-propylene) segments chemically bonded thereto, and (b) the polypropylene segments and the poly(ethylene-co-propylene) segments have been synthesized in the presence of an olefin polymerization catalyst comprising an organometallic compound and a solid catalyst component comprising either titanium and a halogen, or titanium, magnesium, and a halogen. The block copolymer has a weight-average molecular weight of 100,000 or higher, is suitable for producing general-purpose molded articles, and has an excellent balance among mechanical properties, impact resistance, thermal properties, transparency, moldability, and other properties.

Abstract: A polypropylene/ethylene block copolymer, which has a poly(ethylene-co-propylene) segment content of 5 to 100 wt. %, excluding 100 wt. %, and a total ethylene content of 2 to 95 wt. %. (a) The block polymer comprises polypropylene segments and poly(ethylene-co-propylene) segments chemically bonded thereto, and (b) the polypropylene segments and the poly(ethylene-co-propylene) segments have been synthesized in the presence of an olefin polymerization catalyst comprising an organometallic compound and a solid catalyst component comprising either titanium and a halogen, or titanium, magnesium, and a halogen. The block copolymer has a weight-average molecular weight of 100,000 or higher, is suitable for producing general-purpose molded articles, and has an excellent balance among mechanical properties, impact resistance, thermal properties, transparency, moldability, and other properties.

Abstract: The invention concerns a method for preparing block copolymers comprising steps which consist in: polymerising a first monomer using an organolanthanide catalyst wherein said catalyst in the form of a hydride complex of a trivalent metal from the group of rare earths; then in polymerising at least a second monomer. The invention also concerns block copolymers whereof the blocks are polyolefins.

Abstract: A polypropylene/ethylene block copolymer, which has a poly(ethylene-co-propylene) segment content of 5 to 100 wt. %, excluding 100 wt. %, and a total ethylene content of 2 to 95 wt. %. (a) The block polymer comprises polypropylene segments and poly(ethylene-co-propylene) segments chemically bonded thereto, and (b) the polypropylene segments and the poly(ethylene-co-propylene) segments have been synthesized in the presence of an olefin polymerization catalyst comprising an organometallic compound and a solid catalyst component comprising either titanium and a halogen, or titanium, magnesium, and a halogen. The block copolymer has a weight-average molecular weight of 100,000 or higher, is suitable for producing general-purpose molded articles, and has an excellent balance among mechanical properties, impact resistance, thermal properties, transparency, moldability, and other properties.

Abstract: Disclosed is a propylene-ethylene block copolymer which is superior in stiffness, hardness and moldability and also in balance between toughness and low-temperature impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene random copolymer portion, wherein the propylene-ethylene block copolymer has a melt flow rate (MFR) of from 5 to 120 g/10 min.

Abstract: A stable continuous production of a propylene-based block copolymer can proceed for a long time without causing accumulation of particles having a small diameter by a process having the following steps: (1) polymerizing an &agr;-olefin containing liquid propylene as a main component in the presence of hydrogen and a stereoregular polymerization catalyst in one or more polymerization reactors to obtain a polymer slurry; (2) feeding the polymer slurry to a copolymerization reactor; and (3) copolymerizing propylene and an &agr;-olefin other than propylene substantially in a gaseous phase in the presence of the stereoregular polymerization catalyst, the polymer slurry and a deactivating compound in the copolymerization reactor to obtain a propylene-block copolymer powder.

Abstract: Disclosed are a propylene polymer having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain (continuous propylene units wherein directions of {acute over (&agr;)}-methyl carbons are the same as each other), and a process for preparing said polymer. Further disclosed is a propylene polymer composition comprising the above propylene polymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer a metallic salt of higher aliphatic acid. The propylene block polymer of the invention is well-balanced between rigidity, heat resistance and moisture resistance, and can be favorably used for sheet, filament, injection molded product, blow molded product, etc.

Abstract: A propylene/ethylene-&agr;-olefin block copolymer obtained by block-copolymerizing a polypropylene component with an ethylene-&agr;-olefin random copolymer component, which satisfies conditions of the following terms (I) to (III): (I) the content of the polypropylene component having an intrinsic viscosity ([&eegr;]) measured in tetralin at 135° C. of from 0.5 to 5.0 dl/g is from 5 to 95% by weight; (II) the content of the &agr;-olefin in the random copolymer component is from 5 to 40 mol %, and the content of the ethylene-&agr;-olefin random copolymer component whose &rgr; value represented by the following equation: &rgr;=2[E]·[A]/[EA] (wherein [E] represents a molar fraction of ethylene, [A] represents a molar fraction of the &agr;-olefin and [EA] represents a molar fraction of a diad chain of ethylene and the &agr;-olefin) is within the range from 0.5 to 1.

Abstract: A propylene block copolymer with a high proportion of ethylene-propylene copolymer particles (rubber component) well dispersed in a propylene polymer exhibiting well-balanced rigidity and impact resistance can be obtained by using a solid catalyst for polymerization of olefins comprising (a) a solid catalyst component with controlled morphology, comprising magnesium, titanium, and a halogen atom, having an average particle diameter, specific surface area, and pore volume in a specific range, and having a pore size distribution in which an cumulative pore volume with a pore size of 100 Å or less is more than 50%, (b) an organoaluminum compound, and (c) an organosilicon compound. The block copolymer is very useful particularly for the application of vehicle parts such as a bumper and parts for household electric appliances.

Abstract: Provided is a continuous vapor-phase polymerization method for producing polyolefins. In the method, polymer agglomerates and aggregates are prevented from being formed, and polymer deposition on the wall of reactors and around stirring blades is prevented. The method enables continuous and stable production of high-quality polyolefins, with no pipe line clogging. The method is characterized by a specific supply mode of feeding a catalyst activity retardant such as alcohol into polymerization reactors. Specifically, the retardant is fed into the vapor phase in a polymerization reactor and into the powder phase therein through its side wall. Preferably, the retardant is fed into the powder phase through a plurality of sites of the side wall of the reactor.

Abstract: Polyolefin molding composition having a broad melting range, process for its preparation, and its use

Abstract: Bis(salicylaldiminato)titanium complex with optionally substituted phenyl or cyclohexyl on nitrogen catalyzes highly syndiospecific polymerization of propylene. Syndiotactic polypropylene with defects of the type rmr having [rrrr] content greater than 0.70 and block copolymer containing block(s) of the syndiotactic polypropylene and block(s) of poly(ethylene-co-propylene) and/or poly(alpha-olefin-co-propylene) are obtained. Certain of the catalysts provide living polymerization. Living olefin polymers and olefin terminated oligomers and polymers are also products.

Abstract: Disclosed are a propylene polymer having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain (continuous propylene units wherein directions of &agr;-methyl carbons are the same as each other), and a process for preparing said polymer. Also disclosed are a propylene block copolymer containing a crystalline polypropylene portion having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain, and a process for preparing said copolymer. Further disclosed is a propylene polymer composition comprising the above propylene polymer or propylene block copolymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer and a metallic salt of higher aliphatic acid.

Abstract: The invention provides a heat-resistant, low-dielectric polymeric material that is preferably a copolymer in which a non-polar &agr;-olefin base polymer segment and a vinyl aromatic copolymer segment are chemically combined with each other, and that is a thermoplastic resin showing a multi-phase structure in which a dispersion phase formed by one segment is finely dispersed in a continuous phase formed by another segment. It is thus possible to achieve a polymeric material that is excellent in heat resistance, has high strength, and has a low dielectric constant and a reduced dielectric loss, and so is suitable for an electrical insulating material for high-frequency purposes.

Abstract: Propylene polymers containing a matrix of a propylene homopolymer and a copolymer of propylene and other alkenes, wherein, during the separation of the propylene polymers according to tacticity and comonomer distribution of the polymer chains, by first dissolving the propylene polymers in boiling xylene, then cooling the solution at a cooling rate of 10° C./h to 25° C. and thereafter, increasing the temperature, separating the propylene polymers into fractions of different solubility, either one or more of the conditions that i) more than 20% by weight of the matrix remain undissolved on further heating to 112° C. or ii) more than 8% by weight of the matrix remain undissolved on further heating to 117° C. or iii) more than 1% by weight of the matrix remain undissolved on further heating to 122° C. are fulfilled by the matrix which remains undissolved on heating the cooled propylene polymer solution to 80° C.

Abstract: The present invention includes a composition comprising a coupled impact propylene copolymer. Preferably, the coupled impact propylene copolymer has an elastomeric phase that is present in an amount of at least 9 weight percent of the coupled propylene copolymer. Articles formed from the coupled propylene copolymer exhibit improved directionally balanced impact properties as compared with articles formed form comparable noncoupled impact propylene copolymers and also exhibit improved ductile-to-brittle transition temperatures compared with comparable noncoupled impact propylene copolymers. The invention also includes methods for making the coupled impact propylene copolymers using coupling agents, preferably, poly(sulfonyl azides). The invention further includes articles of manufacture that are made from the coupled impact propylene copolymer of the invention.

Abstract: This invention relates to polyolefin alloys that are receptive to metal plating. These compositions also have enhanced properties and are easily processed into articles by various molding methods. The blends of the invention preferably include polyolefin homopolymers or copolymers, acrylonitrile-butadiene-styrene polymers, and styrenic block copolymers. These blends have excellent platability and superior physical properties including enhanced rigidity, thoughness, and dimensional stability.

Abstract: Uses of syndiotactic/atactic block polypropylene are provided in which the molecular weight thereof is preferably at least 120 kD. The syndiotactic/atactic block polypropylene may be used as a polypropylene modifier, a component in an adhesive composition, a shock absorber component, a waterproof membrane component, a packaging film or component thereof, a shapable composition component, and an acoustic absorbent material component, a composition for moulding into a footwear component, a bitumen modifier, a compatibiliser, an emulgator or an emulsifier, as a viscosity improver, and as a spilled oil absorber.

Abstract: A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer is comprised of a recyclable material which is halogen-free and has superior mechanical and electrical properties. This material comprises a polymer mixture of a crystalline propylene homopolymer or copolymer and an elastomeric copolymer of ethylene with at least one alpha-olefin having from 3 to 12 carbon atoms, and optionally containing a diene. The copolymer is characterized by a 200% tension set value of lower than 30% (measured at 20° C. for 1 minute according to ASTM standard D 412). The cable also includes a flame-retardant polymer composition.

Abstract: A functional block copolymer useful as a compatibilizing agent for a blend of a condensation polymer and vinyl polymer comprises segments of a condensation polymer and a vinyl polymer derived from a reactive functional group-containing monomer or a functions-imparting monomer such as ultraviolet absorption or flame retardant functions. The block copolymer can further include a segment of a lower cohesive energy polymer. The condensation or vinyl polymer segment, or the lower cohesive energy polymer segment contains azo or peroxide groups which act as a polymerization initiator for the copolymerization of the vinyl monomer forming the vinyl polymer segment.

Abstract: A propylene block copolymer composition is disclosed which comprises (A) a propylene-&agr;-olefin random copolymer with a propylene content of 99.4 to 99.9 mol % and (B) a propylene-&agr;-olefin random copolymer with a propylene content of 35 to 60 mol %, &agr;-olefin contained in the random copolymer (A) being ethylene and/or 1-butene, wherein the intrinsic viscosity ([&eegr;B]) of the propylene-&agr;-olefin random copolymer (B) ranges from 0.5 to 2.0 dl/g, the ratio ([&eegr;B]/[&eegr;A]) of the intrinsic viscosity ([&eegr;B]) of the propylene-&agr;-olefin random copolymer (B) to the intrinsic viscosity ([&eegr;A]) of the propylene-&agr;-olefin random copolymer (A) ranges from 0.3 to 1.2 and the product (([&eegr;B]/[&eegr;A])×(WA/WB)) of the intrinsic viscosity ratio ([&eegr;B]/[&eegr;A]) and the weight ratio (WA/WB) of both copolymers ranges from 1.0 to 3.0.

Abstract: Disclosed are a propylene polymer having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain (continuous propylene units wherein directions of &agr;-methyl carbons are the same as each other), and a process for preparing said polymer. Also disclosed are a propylene block copolymer containing a crystalline polypropylene portion having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain, and a process for preparing said copolymer. Further disclosed is a propylene polymer composition comprising the above propylene polymer or propylene block copolymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer and a metallic salt of higher aliphatic acid.

Abstract: This invention relates to a method of making polymer compositions, e.g. EPDM compositions, in a multistage reactor with monomers chosen from ethylene, C3-C8 alpha olefins, and a non conjugated diene. In particular, the invention relates to a process for improving diene conversion during the manufacture of the aforementioned polymer compositions by use of a multistage reactor and a metallocene catalyst system.

Abstract: The composition of the present invention is not costly, excellent in an emboss transferring property, and is applicable for various skin materials and interior materials. The present invention provides a polypropylene composition which comprises a propylene block copolymer component containing a crystalline polypropylene segment and a propylene/&agr;-olefin copolymer segment, and a synthetic olefin rubber component and/or a synthetic styrene rubber component, wherein the copolymer segment has an intrinsic viscosity [&eegr;]RC of 6.5 dl/g or less, and an intrinsic viscosity ratio [&eegr;]RC/[72 ]PP of the copolymer to the crystalline polypropylene segment is 0.5 to 1.3; and a product of this intrinsic viscosity ratio [&eegr;]RC/[&eegr;]PP and a weight ratio thereof WPP/WRC, ([&eegr;]RC/[&eegr;]PP)×(WPP/WRC), falls in the range of 0.2-4.

Abstract: A propylene polymer blend is disclosed which comprises (A) a propylene-&agr;-olefin random copolymer with a propylene content of 90 to 99% by weight and (B) a propylene-&agr;-olefin random copolymer with a propylene content of 55 to 90% by weight, wherein the intrinsic viscosity ([&eegr;B]) of the copolymer B ranges from 1.3 to 3.5 dl/g, the ratio ([&eegr;B]/[&eegr;A]) of the intrinsic viscosity ([&eegr;B]) of the copolymer B to the intrinsic viscosity ([&eegr;A]) of the copolymer A ranges from 0.5 to 1.3 and a product (([&eegr;B]/[&eegr;A])×(WA/WB)) of the intrinsic ratio ([&eegr;B]/[&eegr;A]) of both copolymers and the weight ratio (WA/WB) of both copolymers ranges from 1.0 to 4.5. A polypropylene resin composition comprises 99 to 99.9999% by weight of the propylene polymer blend and 1 to 0.0001% by weight of an &agr;-crystal nucleating agent.

Abstract: Polypropylene block-copolymer resin exhibiting high melt tension and improved moldability with balanced stiffness and impact resistance may be molded at high speed into large-sized articles, including, stretched films, with good appearance and resistance to deformation. The block copolymer includes a higher molecular weight polypropylene segment, a lower molecular weight polypropylene segment and an ethylene &agr;-olefin copolymer segment. When subjected to dissolution fractionation m paraxylene, a large proportion is insoluble at 23° C. but soluble at 135° C., and a smaller portion is soluble at 23° C. The block copolymer has a melt flow rate of 0.01 to 5 g/10 min at 230 C. (2.16 kg) and a molecular weight distribution Mw/Mn of 6-20 and Mz/Mw of at least 3.5. A continuous multistage polymerization may be used to form the block copolymer.

Abstract: Disclosed is propylene copolymers produced by the aid of a specific metallocene catalyst system, wherein a percentage of mis-insertion in the copolymer is highly controlled and the copolymers possess beat-resisting property and a high melt strength and a low MFR and are narrow in molecular weight distribution excellent in particulate properties as well as a process for producing the copolymers possessing high steroregularity at a practical polymerzation temperature. The gist of the present invention resides in production of propylene copolymers wherein copolymerization with &agr;,&ohgr;-diene is carried out by the aid of a supported-type catalyst system comprised predominantly of the following compound (A), (B), (C) and (D) at a temperature above 45° C.: the compound (A): a specific metallocene compound represented by Q(C5H4−mR1m)(C5H4−nR2n) MXY, the compound (B): an aluminoxane, the compound (C): an organoaluminum compound, and the compound (D): a particulate carrier.

Abstract: The invention relates to a copolymer composition prepared from copolymers of propene and &agr;-olefin having 2 to 12 carbon atoms, having high molecular weight, a broad molecular weight distribution and an improved comonomer distribution. The invention relates also to a process for producing the composition and the use of the composition in pipes, fittings, profiles, films and foams. The composition is a so-called reactor mixture of copolymers of said monomers comprising a first copolymer having a higher molecular weight, an &agr;-olefin content of 3 to 10 wt. % and a melt flow rate MFR2 of 0,005 to 0,8, and a second copolymer having a lower molecular weight, thus the final composition has a comonomer content of 2 to 10 wt. %, a melt flow rate MFR2 of 0,05 to 2,5 wt. %, a melt flow ratio MFR10/MFR2 of 6 to 15, and the split of the copolymers in the composition between the higher molecular weight copolymer and the lower molecular weight copolymer is from 40/60 to 70/30.

Abstract: The present invention provides a polypropylene block copolymer or resin composition excellent in impact resistance and rigidity.

Abstract: Disclosed are a propylene block copolymer containing a crystalline polypropylene portion having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain, and a process for preparing said copolymer. Further disclosed is a propylene polymer composition comprising the above propylene block copolymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer and a metallic salt of higher aliphatic acid. The propylene block polymer of the invention is well-balanced between rigidity, heat resistance and moisture resistance, and can be favorably used for sheet, filament, injection molded product, blow molded product, etc.

Abstract: There are a number of recent developments relating to co- and homo-polymers of vinyl aromatic monomers. There are syndiotactic polymers of styrene, there are pseudo random polymers of styrene and ethylene. The present invention seeks to provide novel pseudoblock polymers of styrene and ethylene in which at least 10 weight % of the vinyl aromatic monomer is incorporated in the form of one or more atactic pseudoblocks.

Abstract: A polypropylene block copolymer obtained by producing an ethylene-propylene copolymer moiety as a component A having an ethylene content of 1.5 to 6.0% by weight in an amount of 40 to 85% by weight based on the total weight of components A and B in the absence of an inert solvent, substantially, in a first step, with a Ziegler-Natta catalyst, and then producing an ethylene-propylene copolymer moiety as a component B having an ethylene content of 7 to 17% by weight in an amount of 15 to 60% by weight based on an amount of the whole polymer in a gas phase in a second step, wherein an intrinsic viscosity ([&eegr;]B) of the component B is from 2.0 to 5.0 dl/g and the ratio of the intrinsic viscosity ([&eegr;]B) of the component B to an intrinsic viscosity ([&eegr;]A) of the component A is within the range of 0.5 to 1.8.

Abstract: The present invention provides olefin polymerization catalysts and processes for preparing a polypropylene and a propylene block copolymer using the olefin polymerization catalysts. The olefin polymerization catalyst (1) of the invention is formed from: (I-1) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (C) a specific organosilicon compound; (II-1) (D) a specific polyether compound; and optionally, (III) an organometallic compound catalyst component. The olefin polymerization catalyst (2) of the invention is formed from: (I-2) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (D) a specific polyether compound; (II-2) (C) a specific organosilicon compound; and optionally, (III) an organometallic compound catalyst component.

Abstract: Polyolefin compositions comprising: A) a heterogeneous polyolefin composition itself comprising a fraction (A1) which is insoluble in xylene at room temperature and a fraction (A2) which is soluble in xylene at room temperature; and B) a branched propylene polymer. The said compositions are particularly processable when used in the process for the preparation of blown films. The films obtained by the said process are moreover characterized by excellent mechanical properties.

Abstract: A propylene-ethylene block copolymer composition is disclosed which comprises 0.01 to 10% by weight of an A-B type propylene-ethylene block copolymer (C) consisting essentially of a polypropylene segment (A) and an ethylene-propylene random copolymer segment (B), and 99.99 to 90% by weight of a propylene polymer (D), wherein the A-B type propylene-ethylene block copolymer (C) comprises 5 to 80% by weight of the ethylene-propylene random copolymer segment (B) having an ethylene content of 10 to 90% by weight and the propylene polymer (D) comprises 60 to 95% by weight of a homopolymer of propylene or a copolymer of propylene containing a copolymerizable monomer therewith (D1) and 40 to 5% by weight of an ethylene-propylene random copolymer (D2).

Abstract: A rational technical process for producing dialkylnaphthalenes from petroleum-derived starting materials which exist in abundance is established.

Abstract: A high rigidity ethylene-propylene block copolymer which is composed of (I) a crystalline polypropylene portion and (II) an ethylene-propylene random copolymer portion, and in which the crystalline polypropylene portion (I) has a Q value of not more than 5 which is the weight average molecular weight (Mw)/number average molecular weight (Mn) ratio obtained by a gel permeation chromatography (GPC) method, an isotactic pentad fraction of not less than 0.98 as calculated from 13C-NMR, and an intrinsic viscosity of 0.6 to 0.88 dl/g as measured at 135° C. in tetralin; the ethylene-propylene random copolymer portion (II) has an intrinsic viscosity of 4.0 to 6.0 dl/g as measured at 135° C. in tetralin and an ethylene/propylene ratio of 25/75 to 35/65 by weight; and when the total of the above polymers ((I)+(II)) is taken as 100% by weight, the content of the ethylene-propylene random copolymer portion (II) is 8 to 22% by weight, and a process for producing the same.