摘要:
A catalyst system of the formula I X M (Z.sup.1).sub.z.sbsb.1 (Z.sup.2).sub.z.sbsb.2 (Z.sup.3).sub.z.sbsb.3 I where X is C.sub.1 -C.sub.10 -alkyl, 5- to 7-membered cycloalkyl, C.sub.1 -C.sub.10 -alkoxy, C.sub.6 -C.sub.15 -aryl or a compound of the formula II ##STR1## where R.sup.1 to R.sup.5 are substituents as defined in the specification,M is a metal of transition groups II to VIII of the Periodic Table of the Elements, Z.sup.1 to Z.sup.3 are polymers of vinylaromatic compounds, dienes, acrylates or their mixtures and .sub.Z1 to .sub.Z3 are 0, 1, 2 or 3, where.ltoreq..sub.Z1 +.sub.Z2 +.sub.Z3 .ltoreq.3.
摘要:
Polymers of vinylaromatic compounds are prepared at from 0 to 150.degree. C. in the presence of catalyst systems which comprise as active constituentsA) compounds of the formula IXM(Z.sup.1).sub.z.sbsb.1 (Z.sup.2).sub.z.sbsb.2 (Z.sup.3).sub.z.sbsb.3 (I)where the substituents and indices have the following meanings:X is C.sub.1 -C.sub.10 -alkyl, 5- to 7-membered cycloalky,C.sub.1 -C.sub.10 -alkoxy, C.sub.6 -C.sub.15 -aryl or a cyctopentadienyl group,M is a metal of transition groups II to VIII of the periodic Table of the Elements,Z.sup.1 to Z.sup.3are polymers of vinylaromatic compounds, dienes, acrylates or mixtures thereofandZ.sup.1 to Z.sup.3are 0, 1, 2 or 3, where 1.ltoreq.Z.sub.1 +Z.sub.2 +Z.sub.3 .ltoreq.3,andB) linear or cyclic aluminoxane compoundorcompounds which form metallocenium ions and are selected from the group consisting of strong, uncharged Lewis acids, ionic compounds having a Lewis-acid cation and ionic compounds having a Bronsted acid as cation.
摘要:
Particulate, filterable polystyrene formulations are obtained by anionic polymerization of styrene in nonaqueous dispersion if the polymerization is carried out in an aliphatic hydrocarbon as the dispersing medium and with a styrene/diene/styrene three-block copolymer, for example based on polybutadiene or polyisoprene, as the dispersant.
摘要:
Polymers of vinylaromatic compounds are prepared at from -80 to 150.degree. C. in the presence of metallocene catalyst systems by a process in which polymerization is carried out in one stage with the use of a closely intermeshing twin-screw extruder having corotating screws.
摘要:
Essentially syndiotactic and semicrystalline polymers which comprise vinylaromatic monomers arc prepared from a reaction mixture containing, as components, vinylaromatic compounds, metallocene complexes as catalysts and one or more cocatalysts selected from the group consisting of the strong, neutral Lewis acids, the ionic compounds having Lewis acid cations and the ionic compounds having Bronsted acids as cations, by a process in which the components are premixed before entering the reactor.
摘要翻译:包含乙烯基芳族单体的基本间同立构和半结晶聚合物由含有作为组分的乙烯基芳族化合物,作为催化剂的茂金属络合物和一种或多种选自强中性路易斯酸的助催化剂的反应混合物制备,所述离子化合物具有路易斯 通过其中组分在进入反应器之前被预混合的方法,酸阳离子和具有Br + E,uml + EE n酸的阳离子的离子化合物。
摘要:
Thermoplastic molding compositions comprise:______________________________________ A) from 20 to 96% by weight of star polymers obtainable by polymerizing vinylaromatic monomers with a branched monomer building block which contains at least two vinylaromatic functions, B) from 3 to 50% by weight of copolymers comprising vinylaromatic monomers, 1,1-diphenylethylene and, if desired, dienes, C) from 1 to 15% by weight of polyarylene ethers, D) from 0 to 5% by weight of nucleating agents, E) from 0 to 5% by weight of antioxidants, F) from 0 to 5% by weight of stabilizers, and G) from 0 to 50% by weight of fibrous or particulate fillers. ______________________________________
摘要:
Halogen-free antidrip agents for thermoplastic molding materials contain polymers based on vinylaromatic monomers and having molecular weights (M.sub.w) of at least 800 000 g/mol and a narrow molecular weight distribution.
摘要:
Crystalline polymers of ethylene, propylene or cyclic olefins or mixtures thereof are prepared by a process in which polymerization is carried out in the presence of a metallocene catalyst system in a dispersion.
摘要:
Thermoplastic molding compositions compriseA) from 5 to 97.9% by weight of a vinylaromatic polymer with syndiotactic structure,B) from 2 to 90% by weight of a low-viscosity polyamide with a viscosity number VN in the range from 50 to 150 ml/g andC) from 0.1 to 50% by weight of a polar-group-modified polyphenylene ether.
摘要:
Process for preparing copolymers of aromatic vinyl compounds at -80 to 150.degree. C. in the presence of metallocene catalyst systems using a corotating, closely intermeshing twin-screw extruder for polymerization.