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:
A process for the continuous polymerization of vinyl monomers to form vinyl polymers having a molecular weight M.sub.n of from 1000 to 20,000 comprisesa. carrying out the polymerization within an annular gap from 0.5 to 10 mm in width,b. confining the annular gap on the inner surface with a rotor, andc. carrying out the polymerization at from 110.degree. to 270.degree. C.
摘要:
A process for preparing salts of pharmaceutical active substances which have acidic groups by reacting the carboxylic acids with a base in the melt, wherein the acids are reacted with at least the stoichiometric amount of a base in an extruder.