Abstract: 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.

Abstract: Nickel compounds which can be produced by reacting a nickel(O) compound or a nickel compound, which can be converted in situ into a nickel(O) compound, with an adduct or a mixture of maleic acid anhydride and a tertiary phosphine, optionally with a compound of the formula (I) ##STR1## wherein X represents O, NR.sup.4 or ##STR2## and n represents zero or one,and optionally with an organoaluminium compound, are suitable for the homo-and copolymerization of 1-olefins and for the polymerization of acetylene.

Abstract: New block copolymers containing(a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and from 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and(b) a block of polymerized C.sub.4 -C.sub.6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans.are suitable for improved suspension developers.

Abstract: Compounds corresponding to the following general formula: ##STR1## wherein R.sup.0 represents H or, together with R.sup.1, represents --CO-- when X represents --CO-- or, together with R.sup.2, represents --CO-- when X represents --CH.sub.2 --CO,a residue of R, R.sup.1 and R.sup.2, H, C.sub.1 -C.sub.4 alkyl, aryl, COOR.sup.5 or, when R.sup.0 represents H and X represents --CO--, ##STR2## and the other residues R, R.sup.1 and R.sup.2 represent H; R.sup.3 represents H or CH.sub.3 ;R.sup.4 represents C.sub.7 -C.sub.20 aralkyl;R.sup.5 represents H, C.sub.1 -C.sub.4 alkyl or C.sub.6 -C.sub.12 aryl;X represents a residue --(CH.sub.2).sub.n CO--, --(CH.sub.2).sub.n SO.sub.2, --CH.sub.2 --, --CH.sub.2 O--CO-- ##STR3## m represents 1 or 2; and n represents 0 or 1;are suitable for use as incorporable antiagers for polymers, particularly nitrile rubber.

Abstract: Compounds corresponding to the general formula ##STR1## wherein R.sup.3 represents H, CH.sub.3R.sup.4 represents H, C.sub.1-12 alkyl, C.sub.1-4 alkoxy, C.sub.1-12 alkylamino, C.sub.7-8 aralkylamino, arylamino, or C.sub.7-20 aralkyl,A represents a two-bonded group having the structure ##STR2## X may represent a single bond or --CO-- if it is attached to a carbon atom but only --CO-- if it is attached to a hetero atom,R.sup.1 represents R.sup.2, H or C.sub.1-4 alkyl,m represents 1 or 2 andn represents an integer from 1 to 12 are suitable as age resisters which can be built into polymers, in particular nitrile rubber.

Abstract: Olefins such as ethylene can be polymerized with a catalyst which comprises nickel compounds obtained by reacting a nickel-(O) compound or a nickel compound which may be converted in situ into a nickel-(O) compound with an adduct or a mixture of a quinoid compound and a tertiary phosphine and with a compound corresponding to the following general formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, C.sub.6 -C.sub.12 aryl or C.sub.3 -C.sub.8 cycloalkyl optionally substituted by halogen, hydroxy, C.sub.1 -C.sub.20 alkoxy, nitro or C.sub.6 -C.sub.12 aryloxy; also C.sub.6 -C.sub.12 aryl-C.sub.1 -C.sub.20 alkyl, C.sub.6 -C.sub.12 aryl-C.sub.2 -C.sub.20 alkenyl, C.sub.1 -C.sub.20 alkyl-C.sub.6 -C.sub.12 aryl, C.sub.1 -C.sub.20 alkyl-C.sub.3 -C.sub.8 cycloalkyl and C.sub.6 -C.sub.12 aryl-C.sub.3 -C.sub.8 cycloalkyl, di-C.sub.1 -C.sub.4 alkylamino, optionally substituted phenoxy or alkoxy; R.sup.4, R.sup.5 and R.sup.

Abstract: The suspension developer contains, in an electrically-insulating carrier liquid, a pigment and a block copolymer comprising a block of polymerized vinylaromatic compounds and a block of polymerized dienes the double bonds of which have been partially or completely reacted with alkyl mercaptans. The developer is distinguished by its high dispersion stability, small particle size and uniform particle size distribution.

Abstract: Nickel-compounds, producible by reaction of Nickel-(O)-compound or a compound convertible thereto in situ with two different compounds corresponding to the following formulae ##STR1## are useful as catalysts in the polymerization of olefins.

Abstract: Process for the production of polyacetylene, wherein acetylene is polymerized in an organic diluent with the aid of an organometallic mixed catalyst based on a vanadium compound of the formula ##STR1## wherein R.sup.1 represents halogen (chlorine),R.sup.2 and R.sup.3 represent halogen (chlorine), OR.sup.5 (R.sup.5 =C.sub.1 -C.sub.20 alkyl, straight chain, cyclic or branched), wherebyR.sup.2 and R.sup.3 may be the same or different,and on an luminium alkyl compound.

Abstract: Ethylene-butadiene-isoprene terpolymers consisting of more than 80 mol % of alternating ethylene-diene units and in which more than 95 mol % of the diene units built into the polymer are in the 1,4-configuration.

Abstract: A catalyst comprising:(a) an organometallic compound corresponding to the following general formula: RMe wherein R represents a saturated aliphatic or aromatic hydrocarbon radical having from 2 to 8 carbon atoms; and Me represents an alkali metal;(b) a compound corresponding to the following general formula: R'OMe' wherein R' represents a saturated aliphatic or aromatic hydrocarbon radical having from 2 to 8 carbon atoms; and Me' represents an alkali metal; and(c) a tertiary aliphatic triamine.A process for the preparation of said catalyst wherein components (a), (b) and (c) are dissolved, in any order, in an aliphatic or aromatic hydrocarbon and reacted at temperatures of from 0.degree. to 100.degree. C., and its use in the preparation of telomeric polybutadiene homo- or co-polymers.

Abstract: A catalyst comprising:(a) an organometallic compound corresponding to the following general formula: RMe wherein R represents a saturated aliphatic or aromatic hydrocarbon radical having from 2 to 8 carbon atoms; and Me represents an alkali metal;(b) a compound corresponding to the following general formula: R'OMe' wherein R' represents a saturated aliphatic or aromatic hydrocarbon radical having from 2 to 8 carbon atoms; and Me' represents an alkali metal; and(c) a tertiary aliphatic triamine.A process for the preparation of said catalyst wherein components (a), (b) and (c) are dissolved, in any order, in an aliphatic or aromatic hydrocarbon and reacted at temperatures of from 0.degree. to 100.degree. C., and its use in the preparation of telomeric polybutadiene homo- or co-polymers.

Abstract: There is set forth a process for the production of furnace black comprising spraying an oily carbon black forming material into a stream of hot combustion gases produced by reaction of fuel with reaction air, chilling and recovery of the carbon black by separation from the waste gases during which the reaction air is heated by means of waste gases. The waste gases are burned in a combustion apparatus by means of secondary air in order to heat the reaction air to a temperature between 600.degree. and 1,250.degree. C., preferably between 800.degree. and 1100.degree. C. and the thus heated reaction air is then introduced into the process.

Abstract: The invention refers to Isoprene-ethylene copolymers having alternating monomer units in which the proportion of recurring-isoprene-ethylene-sequences is more than 80 mol %, in which the proportion of built-in isoprene in the 1,4-configuration is more than 80 mol % which consists of more than 70 mol % of a trans-arrangement, and in which less than 5 mol % of the built-in isoprene is present in the 3,4-configuration, the copolymers having a glass temperature of between -70.degree. C. and -90.degree. C., a Mooney-viscosity of between 30 and 150 [ML 1+4 (100.degree. C.)] and a viscosity number [.eta.], measured at 25.degree. C. in toluene, of between 0.5 and 6, and a process for their preparation characterized in that polymerization is carried out in solution at a temperature of between -80.degree. C. and +100.degree. C. in the presence of a catalyst system which consists of(a) a vanadium compound of the formula VO(OR).sub.2 X and(b) an organoaluminium compound of formula Al R'.sub.3, HAlR'.sub.2 or R'.sub.

Abstract: A gas-cooled nuclear reactor whose nuclear-fuel elements are constituted by graphite-encapsulated nuclear fuel particles and have graphite coatings is shut down in accordance with the present invention by introducing into the primary coolant gas circulation, a gadolinium-containing substance which is dispersed in the primary cooling gas before the latter enters the space between the fuel elements within the reactor core so that the gadolinium-containing substance is at least partly deposited on the free graphitic surfaces of the fuel elements.

Abstract: Graft polymers having improved low temperature characteristics of optionally partially or completely saponified vinyl ester homopolymers or copolymers as graft substrates and grafted siloxane units.

Abstract: 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.

Abstract: 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 aliphatic hydrocarbon 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.

Abstract: 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.

Abstract: 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.