Abstract: An inkjet printing method includes directing a printhead of an inkjet printer towards a substrate to be printed, generating ink drops in the printhead of the inkjet printer, and directing the ink drops, after they have been discharged from the nozzle of the printhead, into a zone with a locally increased temperature in such a way that the volume of the drops is actively reduced during the phase of flight to the substrate.

Abstract: The present invention relates to pulverulent solids obtainable by reaction of a metal alkyl compound of a divalent or higher-valent metal and a finely divided support which on its surface bears functional groups which can form a chemical bond between the metal atom of the metal alkyl compound and the surface of the support, wherein the particles of the finely divided support have particle diameters of less than 1000 nm and less than 5% by weight of the metal alkyl compound is extractable in a single extraction of the pulverulent solid with 20 ml of heptane per gram of solid at 50° C. In addition, the invention relates to a process for preparing the pulverulent solids, a catalyst composition for the polymerization of olefins which comprises the pulverulent solids and polymerization processes using the catalyst composition.

Abstract: The present invention relates to pulverulent solids obtainable by reaction of a metal alkyl compound of a divalent or higher-valent metal and a finely divided support which on its surface bears functional groups which can form a chemical bond between the metal atom of the metal alkyl compound and the surface of the support, wherein the particles of the finely divided support have particle diameters of less than 1000 nm and less than 5% by weight of the metal alkyl compound is extractable in a single extraction of the pulverulent solid with 20 ml of heptane per gram of solid at 50° C. In addition, the invention relates to a process for preparing the pulverulent solids, a catalyst composition for the polymerization of olefins which comprises the pulverulent solids and polymerization processes using the catalyst composition.

Abstract: A process for polymerizing one or more alpha-olefins of formula CH2?CHT wherein T is a hydrogen atom or a C1–C20 alkyl radical comprising the following steps: a) contacting in a continuous way one or more of said alpha olefins with a metallocene based catalyst system in a loop reactor, wherein: (i) the reaction is carried out in a liquid medium; (ii) the average residence time of the metallocene-based catalyst system is not more than 30 minutes; (iii) the temperature of the loop ranges from 25° to 70° C.; in order to obtain a polymerization degree ranging from 60 to 500 g per gram of catalyst system; b) feeding in continuous the prepolymerized metallocene-based catalyst system obtained in step a) into a polymerization reactor C) polymerizing one or more alpha-olefins, the same or different from the alpha olefins used in step a), in the presence of said prepolymerized metallocene-based catalyst system.

Abstract: A process for polymerizing one or more alpha-olefins of formula CH2?CHT wherein T is a hydrogen atom or a C1-C20 alkyl radical comprising the following steps: a) contacting in a continuous way one or more of said alpha olefins with a metallocene based catalyst system in a loop reactor, wherein: (i) the reaction is carried out in a liquid medium; (ii) the average residence time of the metallocene-based catalyst system is not more than 30 minutes; (iii) the temperature of the loop ranges from 25° to 70° C.; in to obtain a polymerization degree ranging from 60 to 500 g per gram of catalyst system; b) feeding in continuous the prepolymerized metallocene-based catalyst system obtained in step a) into a polymerization reactor C) polymerizing one or more alpha-olefins, the same or different from the alpha olefins used in step a), in the presence of said prepolymerized metallocene-based catalyst system.

Abstract: A metallocene compound having the formula (I): where M1 is a metal of group IVb, Vb or VIb of the Periodic Table of Elements, two or more adjacent radicals R4 to R12 together with the atoms connecting them form one or more aromatic or aliphatic rings and if R5, R6, and R7 are hydrogen, R9 and R11 are identical or different and are a C1-C4 alkyl group, a C1-C6 alkeryl group, or a C6-C10 aryl group.

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

Abstract: The present invention relates to single- or multilayer films and one or more layers comprising at least one polyolefin molding composition containing at least one polyolefin derived from at least one olefin having at least 2 carbon atoms, of the formula Ra—CH═CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a straight-chain or branched C1-C15-alkyl radical, or Ra and Rb, together with the atoms connecting them, form a ring or ring system, and the polyolefin has been prepared by means of metallocene catalysts. The present invention furthermore relates to a process for the production of films and layers in which a polyolefin molding composition having a particle size of from 20 &mgr;m to 5000 &mgr;m is used or prepared. The shaped polyolefin molding composition is melt-mixed with at least one additive and shaped. The melt-mixed and shaped material is melted at a temperature of from 150° C. to 300° C.

Abstract: The present invention relates to single- or multilayer films and one or more layers comprising at least one polyolefin molding composition containing at least one polyolefin derived from at least one olefin having at least 2 carbon atoms, of the formula Ra—CH═CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a straight-chain or branched C1-C15-alkyl radical, or Ra and Rb, together with the atoms connecting them, form a ring or ring system, and the polyolefin has been prepared by means of metallocene catalysts. The present invention furthermore relates to a process for the production of films and layers in which a polyolefin molding composition having a particle size of from 20 &mgr;m to 5000 &mgr;m is used or prepared. The shaped polyolefin molding composition is melt-mixed with at least one additive and shaped. The melt-mixed and shaped material is melted at a temperature of from 150° C. to 300° C.

Abstract: A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula Ra—CH═CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or Ra and Rb, together with the atoms connecting them, can form a ring, at a temperature of from −60 to 200° C., at a pressure of from 0.

Abstract: The present invention relates to a supported catalyst for the polymerization of olefins, which can be prepared by reacting the reaction product formed from an aluminoxane and at least one metallocene with a microporous, polymeric support.

Abstract: A process for the production of pellets containing nicotinamide by droplet-processing of molten nicotinamide by means of laminar jet disintegration in a tower and cooling of the molten droplets by heat exchange until solidified spherical particles are formed.

Abstract: Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts.

Abstract: A catalyst system comprises at least one metallocene and at least one passivated support and preferably at least one cocatalyst. The passivated support is prepared by treating at least one inorganic oxide with at least one organometallic compound, preferably in an inorganic solvent. A polymer having a melting point of ≧158° C., a proportion of reverse insertions of <0.2% and a triad tacticity of >98.0% can be obtained using this catalyst system.

Abstract: A very effective catalyst system for the polymerization or copolymerization of olefins comprises a cocatalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I in which, in the preferred form, M1 is Zr or Hf, R1 and R2 are halogen or alkyl, R3 is alkyl, R4 to R12 are alkyl or hydrogen and R13 is a (substituted) alkylene or heteroatom bridge. The metallocenes, in particular the zirconocenes, produce polymers of a very high molecular weight, in the case of prochiral monomers polymers of a very high molecular weight, very high stereoactivity and very high melting point, at high catalyst activities in the industrially particularly interesting temperature range between 50 and 80° C. In addition, reactor deposits are avoided by means of supported catalyst systems.

Abstract: A very effective catalyst system for the polymerization or copolymerization of olefins comprises a cocatalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I in which, in the preferred form, M1 is Zr or Hf, R1 and R2 are halogen or alkyl, R3 is alkyl, R4 to R12 are alkyl or hydrogen and R13 is a (substituted) alkylene or heteroatom bridge. The metallocenes, in particular the zirconocenes, produce polymers of very high molecular weight, in the case of prochiral monomers polymers of very high molecular weight, very high stereotacticity and very high melting point, at high catalyst activities in the industrially interesting temperature range between 50 and 80° C.

Abstract: Polyolefins with a molecular weight distribution M.sub.w /M.sub.n .gtoreq.3.0, which may be monomodal, bimodal or multimodal, can be obtained by polymerization or copolymerization of olefins with a catalyst system consisting of an aluminoxane and a transition metal component (metallocene), in which the transition metal component consists of at least one zirconocene of the formula I and at least one zirconocene of the formula Ia ##STR1## or alternatively of at least 2 zirconocenes of the formula I.

Abstract: A copolymer having from 80 to 40% by weight of propylene units, based on the total polymer, and from 20 to 60% by weight of at least one comonomer, based on the total polymer. The comonomer units are prepared from ethylene or olefins having at least 4 carbon atoms and the formula R.sup.a --CH.dbd.CH--R.sup.b, where R.sup.a and R.sup.b are identical or different and are each a hydrogen atom or an alkyl radical having from 1 to 15 carbon atoms, or R.sup.a and R.sup.b, together with the carbon atoms connecting them, form a ring having 4 to 12 carbon atoms. The copolymer has a viscosity number of greater than 200 cm.sup.3 /g.

Abstract: A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula Ra—CH?CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms or Ra and Rb, together with the atoms connecting them, can form a ring, at a temperature of from ?60° to 200° C., at a pressure of from 0.

Abstract: The present invention relates to zwitterionic neutral transition metal compounds. The compounds are suitable as catalyst components for the polymerization of olefins.