摘要:
Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on monocyclopentadienyl compounds of vanadium and alumoxanes in the presence of aromatic vinyl compounds as the solvent at temperatures of −30 C. to +80 C. By means of the process according to the invention, it is possible to straightforwardly produce solutions of polydiolefins, such as polybutadiene, having 1,2 unit contents of 10 to 30% in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.
摘要:
Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on cobalt compounds, organoaluminum compounds and modifiers in the presence of aromatic vinyl compounds at temperatures of −30° C. to +80° C. By means of the process according to the invention, it is possible straightforwardly to produce solutions of polydiolefins, such as polybutadiene, having different 1,2 unit contents in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.
摘要:
The present invention relates to a two-component supported catalyst, consisting of a) at least one transition metal compound applied on to an inorganic or polymeric organic supporting material, the metal being selected from the group of the d and f elements of the periodic table according to Mendeleev, b) at least one organometallic compound applied on to an inorganic or polymeric organic supporting material, the metal being selected from the group of the IIa, IIb and IIIb elements of the periodic table (F. A. Cotton, G. Wilkinson, Anorganische Chemie, 4th edition, VCH Verlagsgesellschaft mbH, Weinheim, 1985) and c) optionally at least one modifier which is supported on a) and/or on b), the transition metal compound in component a) being used in quantities of 0.1 to 100 mmol, based on 100 g of the supporting material, and the organometallic compound in component b) being used in quantities of 0.1 to 100 mmol, based on 100 g of the supporting material, and component c) being used in quantities of 0.01 to 500 mmol, based on 100 g of the supporting material, and the supporting materials of components a) to b) being used in quantitative ratios by weight (g/g) of 1.10−3 to 1000, and at least one of components a) or b) having a supporting material with an average particle size before or during polymerisation of
摘要:
The block copolymers according to the invention which are based on conjugated diolefins and polar monomers and are prepared in the presence of catalysts based on the rare earth metals have a high cis-1,4 content in the polydiene block and, because of their polar polymer part and their non-polar diene polymer part, can be used as agents which impart compatibility in the preparation of vulcanizates with a filler content for the production of tires and tire component in the preparation of thermoplastic elastomers or in the modification of thermoplastics.
摘要:
The present invention relates to a new catalyst based on allyl complexes of the rare earths, of general formula [(C3R15)rM1(X)2−r(D)n]+[M2(X)p(C6H5−qR2q)4−p]− (I), to the preparation of this new catalyst, and to its use for the polymerization of unsaturated compounds, particularly of conjugated dienes, in solution and in the gas phase.
摘要:
A process for polymerizing a gaseous conjugated diene by bringing it in contact with a catalyst consisting of a rare earth allyl compound, an organic aluminum compound, an inorganic support and optionally, the same or a different conjugated diene. The resulting polymers possess elevated proportions of cis-1,4 units.
摘要:
The present invention concerns a method for the copolymerization of conjugated diolefins and vinyl-aromatic monomers in the presence of rare-earth catalysts and the use of the copolymers in rubber mixtures for tire applications.
摘要:
The present invention relates to a supported cobalt catalyst consisting of(a) cobalt compounds,(b) organoaluminium compounds,(c) water or OH-acidic compounds,(d) inorganic or polymeric organic support materials and(e) modifiers selected from the group comprising tertiary phosphines,to the production thereof and to the use thereof for the polymerization of unsaturated compounds, in particular of conjugated dienes, in the gas phase. With the assistance of the catalysts according to the invention, it is possible to achieve gas phase polymerization of conjugated dienes with an elevated content of lateral double bonds in the polymers.
摘要:
The present invention relates to a novel dendrimic compounds, to a method for the production thereof and to the use thereof as catalysts for the production of polymers, in particular to the use thereof as co-catalysts for metallocenes for polymerizing unsaturated compounds.
摘要:
The present invention relates to a catalyst system based on monoazadiene metal complexes of the formula ##STR1## and a co-catalyst suitable for activating the metal complex, and to the use of the catalyst system for the polymerization of unsaturated compounds, especially for the polymerization and copolymerization of olefins and/or dienes.The novel catalyst system is characterised in particular by its ease of access, its lack of sensitivity to external influences and its ease of handling.