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:
Ethylene/vinyl acetate copolymers containing very high molecular weight components and having a reduced tendency to tackiness may be obtained by a further addition of ethylene during the process of solution polymerization at a moderate pressure.
摘要:
Syndiotactic 1,2-polybutadiene of high quality may be obtained in excellent yield by solution polymerization of butadiene-(1,3) in hydrocarbons, using organometallic mixed catalysts composed of trialkylaluminium, hydrocarbon-soluble chromium-III compounds and a dialkylphosphite corresponding to the formula ##STR1## wherein R denotes straight chained or branched C.sub.1 -C.sub.8 -alkyl andR.sub.1, R.sub.2 and R.sub.3 denote methyl or ethyl orR and R.sub.1 together form a methylene group.
摘要:
A catalyst comprising(a) a reaction mixture formed by reacting M(RCO.sub.2).sub.3 with AlR.sub.3.sup.1,(b) AlR.sub.3.sup.2 and/or HAlR.sub.2.sup.2 and(c) a Lewis acidwherein M denotes a trivalent rare earth element with an atomic number of 57 to 71, R denotes a saturated or unsaturated, straight chain or branched chain alkyl group having 1 to 20 C-atoms which may be substituted one or more times with cycloalkyl having 5 to 7-atoms and/or phenyl, the carboxyl group being attached to a primary, secondary or tertiary C-atom; a cycloalkyl group having 5 to 7 ring carbon atoms, which may be substituted one or more times with alkyl groups having from 1 to 5 C-atoms; or an aromatic group having from 6 to 10 ring carbon atoms, which may be substituted one or more times with alkyl groups having 1 to 5 C-atoms, and R.sup.1 and R.sup.2 are identical or different, straight chain or branched chain alkyl groups having from 1 to 10 C-atoms. Said catalyst may be used for polymerizing diene monomers in solution. Its production takes place by mixing the components in any order.
摘要:
A catalyst composition comprising (a) TiI.sub.4 and/or TiOR.sup.1 I.sub.3, (b) AlR.sub.3 and/or HAlR.sub.2 and (c) TiXCl.sub.3 can be used for polymerizing butadiene. Said catalyst can be obtained by mixing the components a, b and c in any order at temperatures from -10.degree. to +80.degree. C. R' represents C.sub.1-8 alkyl and X represents a C.sub.1-12 alkoxy radical optionally substituted one or more times by halogen, C.sub.6 or C.sub.7 cycloalkyl and/or phenyl, a C.sub.5-7 cycloalkoxy radical optionally substituted one or more times by C.sub.1-5 alkyl groups, a phenoxy group corresponding to the formula ##STR1## wherein R.sub.2 and R.sub.6 can be the same or different and are hydrogen or C.sub.1-5 alkyl, a carboxyl group having the formula R.sup.7 --COO wherein R.sup.7 is C.sub.1-12 alkyl optionally substituted one or more times by halogen, C.sub.5-7 cycloalkyl and/or phenyl, a C.sub.5-7 cycloalkyl radical optionally substituted one or more times by C.sub.1-5 alkyl groups, or phenyl.
摘要:
A process for the production of strictly alternating copolymers of trans-1,4-butadiene and propylene units by the solution copolymerization of butadiene and propylene with vanadium-containing organometallic mixed catalysts, wherein vanadyl dialkoxy halides of which the alkoxy groups are branched in the 2-position to the oxygen atom are used as the vanadium compounds.