摘要:
The invention relates to a catalyst solution for the polymerization of α-olefins obtained by: reacting a metallocene compound with an activator compound, which is able to react with the metallocene compound in such a way that a ligand is displaced from the central atom and the resulting cationic complex is stabilized by a non-coordinating anion as ion pair; adding one or several α-olefins at a molar ratio of metallocene compound: α-olefins of between 1: 1 and 1: 100; and mixing the resulting product with at least 10 volume parts of an aliphatic hydrocarbon.
摘要:
A process is disclosed for producing copolymers of ethylene with C3-C10-alk-1-enes. Polymerisation is carried out at pressures in a range from 1000 to 3500 bars and at temperatures in a range from 200 to 280 °C, in the presence of a catalyst system which contains as active components a donor-substituted complex of monocyclopentadienylamido and a transition metal, a metallocene ion generating compound and optionally an aluminium trialkyl compound.
摘要:
The invention relates to a method for coating a reactor. Said method is characterised in that a metal layer or a metal polymer dispersion layer is deposited on the inner surface of the reactor in a currentless manner by contacting the surfaces to a metal electrolytic solution which contains a reduction means and a halogenated polymer in dispersed form in addition to the metal electrolyte. Said halogenated polymer can optionally be deposited.
摘要:
The invention relates to a method for coating a reactor. Said method is characterised in that a metal layer or a metal polymer dispersion layer is deposited on the inner surface of the reactor in a currentless manner by contacting the surfaces to a metal electrolytic solution which contains a reduction means and a halogenated polymer in dispersed form in addition to the metal electrolyte. Said halogenated polymer can optionally be deposited.
摘要:
The invention relates to a copolymer comprising (a) 30 to 95.5 wt.% of ethylene; (b) 4 to 40 wt.% of at least one vinyl ester of C2-6 monocarboxylic acids; (c) 0.5 to 30 wt.% of at least one (meth)acrylate of the general formula (I), the radicals having the meaning given in the description; (d) 0 to 10 wt.% of at least one monomer which can be polymerised with the monomers (a) to (c). The invention also relates to the use of said copolymer as a flow improver.
摘要:
Ethylene-based copolymers suitable as viscosity improvers for petroleum distillates of a) 50 to 94 wt. % ethylene; b) 3 to 30 wt. % one or more vinyl esters of C2-C6 monocarboxylic acids; c) 3 to 20 wt. % one or more aminoalkylene acrylates of general formula (I) in which R1 is hydrogen or methyl, the radicals R?2 and R3¿ may be the same or different and stand for hydrogen or a C¿1?-C6 alkyl radical and A?1¿ is a straight-chained or branched C¿2?-C10 alkylene radical; and d) 0 to 10 wt. % one or more monomers which can be copolymerised with monomers a) to c), in which such copolymers are excluded in which monomer b) is vinyl acetate and have a number average molecular weight of 5000 to 50000; or of a') 50 to 95.5 wt. % ethylene; b') 4 to 30 wt. % one or more vinyl esters of C2-C6 monocarboxylic acids; c') 0.5 to 20 wt. % one or more vinyl imidazoles of general formula (II) in which the radicals R?4, R5 and R6¿ may be the same or different and are hydrogen or a C¿1?-C6 alkyl radical, or 0.5 to 20 wt. % one or more aminoalkyl vinyl ethers of general formula (III) in which the substituents are: R?7, R8: C¿1-C6 alkyl; R?9, R10, R11¿: hydrogen or C¿1?-C6 alkyl; A?2: C¿2-C6 alkylene; and d') 0 to 10 wt. % one or more monomers which can be copolymerised with monomers a') to c'). The invention also relates to the use of these copolymers as viscosity improvers for petroleum middle distillates and to pretroleum distillates containing them.
摘要:
The invention relates to a copolymer comprising (a) 30 to 95.5 wt.% of ethylene; (b) 4 to 40 wt.% of at least one vinyl ester of C2-6 monocarboxylic acids; (c) 0.5 to 30 wt.% of at least one (meth)acrylate of the general formula (I), the radicals having the meaning given in the description; (d) 0 to 10 wt.% of at least one monomer which can be polymerised with the monomers (a) to (c). The invention also relates to the use of said copolymer as a flow improver.
摘要:
The invention relates to a catalyst preparation suitable for the (co)polymerisation of Alk-1-enes. To obtain said preparation a metallocene complex is mixed with a C3-20-Alk-1-ene in an inert solvent and the resulting mixture is reacted in a controlled manner with a compound forming metallocene ions. The mixture obtained is diluted with an inert, non-polar, essentially aliphatic solvent. In addition, the catalyst preparation is possibly applied to a particulate substrate material.