Abstract: A method for adjusting the average particle size of a spherical catalyst support, in particular a spherical catalyst support comprising a magnesium dihalide-ethanol-adduct, a spherical catalyst support obtained by the method, a solid catalyst composition comprising the spherical catalyst support, and the use of the solid catalyst composition for the polymerization of an olefins.

Abstract: A method for adjusting the average particle size of a spherical catalyst support, in particular a spherical catalyst support comprising a magnesium dihalide-ethanol-adduct, a spherical catalyst support obtained by the method, a solid catalyst composition comprising the spherical catalyst support, and the use of the solid catalyst composition for the polymerization of an olefins.

Abstract: An electron donor composition comprising a dihydroanthracene derivative and a phthalate ester. Furthermore, a solid catalyst composition comprising the electron donor composition for use in ?-olefin polymerisation. Further, a process for the production of a polymer containing ?-olefin monomer units with the electron donor composition.

Abstract: Random copolymers of propylene with other 1-alkenes having up to carbon atoms, whose content of comonomers is in the range from 0.7 to 1.4% by weight if the only comonomer present in the propylene copolymers is ethylene, or whose content of comonomers is in the range from 0.7 to 3.0% by weight if at least one C4–C10-1-alkene is present as comonomer, and whose cold-xylene-soluble fraction is from 1.0 to 2.5% by weight if ethylene is present as a comonomer in the propylene copolymers, or whose cold-xylene-soluble fraction is from 0.75 to 2.0% by weight if the only comonomers present are C4–C10-1-alkenes, and a process for preparing the random copolymers of propylene is described, as is their use for producing films, fibers or moldings, and also the films, fibers and moldings themselves and biaxially stretched films made from random propylene copolymers of this type and processes for their production.

Abstract: Random copolymers of propylene with other 1-alkenes having up to carbon atoms, whose content of comonomers is in the range from 0.7 to 1.4% by weight if the only comonomer present in the propylene copolymers is ethylene, or whose content of comonomers is in the range from 0.7 to 3.0% by weight if at least one C4–C10-1-alkene is present as comonomer, and whose cold-xylene-soluble fraction is from 1.0 to 2.5% by weight if ethylene is present as a comonomer in the propylene copolymers, or whose cold-xylene-soluble fraction is from 0.75 to 2.0% by weight if the only comonomers present are C4–C10-1-alkenes, and a process for preparing the random copolymers of propylene is described, as is their use for producing films, fibers or moldings, and also the films, fibers and moldings themselves and biaxially stretched films made from random propylene copolymers of this type and processes for their production.

Abstract: Random copolymers of propylene with other 1-alkenes having up to carbon atoms, whose content of comonomers is in the range from 0.7 to 1.4% by weight if the only comonomer present in the propylene copolymers is ethylene, or whose content of comonomers is in the range from 0.7 to 3.0% by weight if at least one C4-C10-1-alkene is present as comonomer, and whose cold-xylene-soluble fraction is from 1.0 to 2.5% by weight if ethylene is present as a comonomer in the propylene copolymers, or whose cold-xylene-soluble fraction is from 0.75 to 2.0% by weight if the only comonomers present are C4-C10-1-alkenes, and a process for preparing the random copolymers of propylene is described, as is their use for producing films, fibers or moldings, and also the films, fibers and moldings themselves and biaxially stretched films made from random propylene copolymers of this type and processes for their production.

Abstract: Random copolymers of propylene with other 1-alkenes having up to carbon atoms, whose content of comonomers is in the range from 0.7 to 1.4% by weight if the only comonomer present in the propylene copolymers is ethylene, or whose content of comonomers is in the range from 0.7 to 3.0% by weight if at least one C4-C10-1-alkene is present as comonomer, and whose cold-xylene-soluble fraction is from 1.0 to 2.5% by weight if ethylene is present as a comonomer in the propylene copolymers, or whose cold-xylene-soluble fraction is from 0.75 to 2.0% by weight if the only comonomers present are C4-C10-1-alkenes, and a process for preparing the random copolymers of propylene is described, as is their use for producing films, fibers or moldings, and also the films, fibers and moldings themselves and biaxially stretched films made from random propylene copolymers of this type and processes for their production.

Abstract: Injection stretch blow molded containers are obtainable from olefin polymers, comprising homopolymers of propylene or copolymers of propylene with other C2-C10-alk-1-enes, which are obtainable by polymerizing the corresponding monomers with metallocene catalysts. Processes for producing injection stretch blow molded containers from olefin polymers, and also the use of olefin polymers for producing injection stretch blow molded containers, are described.

Abstract: Propene terpolymers consist of from 80 to 99.5 mol % of structural units derived from propene, from 0.1 to 15 mol % of structural units derived from ethene or a C4-C6-1-olefin (I) and from 0.

Abstract: A sealable coextruded film is made from at least one outer layer and from at least one base layer, where the outer layer is composed of a propylene terpolymer comprising from 80 to 99.5 mol % of structural units derived from propylene, from 0.2 to 15 mol % of structural units derived from ethene or from a C4-C6 1-olefin (I) and from 0.3 to 15 mol % of structural units derived from another C4-C12 1-olefin (II) different from the C4-C6 1-olefin (I), and where the propylene terpolymer has been prepared using metallocene catalysts.

Abstract: In a process for the polymerization of C2-C8-alk-1-enes by means of a Ziegler-Natta catalyst system, in which polymerization is carried out from the gas phase in at least one reaction zone at from 40 to 120° C. and pressures of from 1 to 100 bar, the pressure and temperature in the reaction zone are set so that an operating point formed by these parameters in a pressure-temperature diagram is located at from 0.2 to 5.0 bar below the dew line of the respective reaction mixture above which condensation of the C2-C8-alk-1-enes occurs.

Abstract: Random copolymers of propylene with other 1-alkenes having up to 10 carbon atoms,

Abstract: A process for preparing a supported transition metal catalyst comprising a particulate organic or inorganic support material, a transition metal complex and a compound capable of forming metallocenium ions comprises the following process steps: a) contacting a solution of a compound capable of forming metallocenium ions with a second solvent in which this compound is only sparingly soluble, in the presence of the support material, b) removing at least part of the solvent from the support material and c) contacting a solution of a mixture of a compound capable of forming metallocenium ions and a transition metal complex with a second solvent in which this mixture is only sparingly soluble, in the presence of the support material obtained as described in a) and b).

Abstract: Random copolymers of propylene with ethylene and at least one C4-C10-alk-1-ene, having a melting point, determined by the DSC method, of less than or equal to 135° C., are obtainable by polymerization of propylene, ethylene and at least one C4-C10-alk-1-ene in the absence of a liquid reaction medium from the gas phase at from 50 to 100° C. and a pressure of from 15 to 40 bar in the presence of a Ziegler-Natta catalyst system comprising a) a titanium-containing solid component comprising at least one halogen-containing magnesium compound, an electron donor and an inorganic oxide as support, b) an aluminum compound and c) a further electron donor compound, wherein the ratio of the partial pressures of propylene and ethylene is set to from 20:1 to 100:1 and the ratio of the partial pressures of the C4-C10-alk-1-ene(s) and ethylene is set to from 2.5:1 to 20:1. A process for preparing such random copolymers is also provided, and they can be used in films, fibers or moldings.

Abstract: C2-C8-Alk-1-enes are polymerized by means of a Ziegler-Natta catalyst system in a reactor cascade comprising at least two reactors, a homo- or copolymer of C2-C8-alk-1-enes being prepared in a reactor RA, upstream of which one or more further reactors may be connected, the reaction mixture being discharged from RA and transferred to a subsequent reactor RB and the polymerization in RB and in the reactors which may be connected to RB being carried out in the presence of a liquid or dissolved regulator for regulating the catalyst activity, by a process in which the regulator is added to the reaction mixture after discharge from RA and before entry into RB, and an apparatus for polymerizing C2-C8-alk-1-enes by means of the novel process is described.

Abstract: A process for the homo- or copolymerization of C.sub.2 -C.sub.8 -alk-1-enes by means of a Ziegler-Natta or a metallocene catalyst system in a stirred bed of finely divided polymer from the gas phase, the transition metal-containing catalyst solid of the Ziegler-Natta or metallocene catalyst system being fed to the reactor by C.sub.2 -C.sub.8 -alk-1-ene metered into the reactor, wherein the transition metal-containing catalyst solid, together with at least some of the C.sub.2 -C.sub.8 -alk-1-ene, is fed to the reactor through one or more pipes which project perpendicularly or virtually perpendicularly from above into the gas space and end above the pulverulent stirred reactor bed.

Abstract: Catalyst systems of the type comprising the Ziegler-Natta catalysts contain, as active components,a) a titanium-containing solid component which contains titanium, magnesium, halogen and a carboxylic ester as an electron donor, and, as a cocatalyst,b) an aluminum compound andc) if required, a further electron donor, a compound of the following formula IR.sub.m.sbsb.1 Al--(OCOR.sup.1).sub.m.sbsb.2 (I)whereR and R.sup.1 are identical or different and are each hydrogen or C.sub.1 -C.sub.8 -alkyl andm.sub.1 and m.sub.2 are each 1 or 2 and sum to give 3, being used as aluminum compound b) in the preactivation of the titanium-containing soild compound a) with the cocatalyst.

Abstract: A novel process for the preparation of Ziegler-Natta catalyst systems containing, as active components,a) a titanium-containing solid component which contains titanium, magnesium, halogen and a carboxylic ester and, as a cocatalyst,b) an aluminum compound andc) if required, a further electron donor is described. Ziegler-Natta catalyst systems which are obtainable by this process, the preparation of polymers of propylene with the aid of these catalyst systems, the polymers obtainable thereby and films and moldings of these polymers are also described.

Abstract: A process for preparing random propylene copolymers containing copolymerized C.sub.2 -C.sub.10 -alk-1-enes by polymerization of propylene and C.sub.2 -C.sub.10 -alk-1-enes in the presence of a Ziegler-Natta catalyst system comprising a titanium-containing solid component a) comprising a compound of magnesium, a halogen, silica gel as support and a carboxylic ester as electron donor compound, and also, as cocatalysts, an aluminum compound b) and a further electron donor compound c), where propylene and the C.sub.2 -C.sub.10 -alk-1-enes are polymerized with one another at from 50 to 100.degree. C. at pressures in the range from 15 to 40 bar and mean residence times of from 0.5 to 5 hours and the support used in the titanium-containing solid component is a silica gel which has a mean particle diameter of from 5 to 200 .mu.m, a mean particle diameter of the primary particles of from 1 to 10 .mu.m and voids or channels having a mean diameter of from 1 to 10 .mu.

Abstract: Partially crosslinked plastic compositions with a melt flow index at 230.degree. C. and under a load of 2.16 kg, of from 0.1 to 100 g/10 min, and a gel content of less than 12% by weight, is prepared froma) a polymer comprisinga.sub.1) from 60 to 92% by weight of a propylene homopolymer anda.sub.2) from 8 to 40% by weight of a propylene copolymer having C.sub.2 -C.sub.10 -alk-1-enes incorporated into its polymer chain and with a comonomer content, based on a.sub.2) of from 15 to 70% by weight, andb) a compound of the formula (I) ##STR1## where R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl,X is substituted or unsubstituted C.sub.1 -C.sub.30 -alkyl or substituted or unsubstituted C.sub.7 -C.sub.30 -arylalkyl, where each of the alkyl groups may be interrupted byone or more oxygen atoms in ether moieties (--O--) or oxycarbonyl moieties (--O--CO--) and/or bynitrogen groups of the formula NR.sup.2, where R.sup.2 is hydrogen, C.sub. -C.sub.6 -alkyl or C.sub.1 -C.sub.