Abstract: An improved process of polymerizing an aqueous emulsion of chloroprene monomer stabilized with phenothiazine wherein polymerization is initiated in the presence of phenothiazine stabilizer and molecular oxygen with a polymerization initiator comprising sodium dithionite.

Abstract: This invention relates to a polychloroprene elastomer distinguished by good processing properties and high tensile strength in the form of a polychloroprene mixture containing a sol polymer and a gel polymer in a ratio, by weight, of from 1:4 to 9:1, characterized in that both polymers have been produced in the presence of from 2.5 to 4.0 parts, by weight, of the potassium salt of disproportionated abietic acid (expressed as acid), from 0.3 to 1.0 part, by weight, of a condensation product of naphthalene sulphonic acid and formaldehyde and from 0.1 to 1.5 parts, by weight, of potassium hydroxide, based in each case on 100 parts, by weight, of monomer, and in that the gel polymer is a copolymer of chloroprene and from 1.5 to 2.5 mole percent, based on total monomer, of a diester corresponding to the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 represent hydrogen, chlorine or C.sub.1 -C.sub.4 alkyl; andX represents C.sub.2 -C.sub.10 alkylene.

Abstract: A process for the production of polychloroprene mixtures of sol and gel polymers in a ratio, by weight, of rom 1:4 to 9:1, the gel polymer being produced by radical emulsion polymerization from chloroprene in the presence of 4 to 10% by weight of water soluble disproportionated abietic acid, and the sol polymer being produced by radical emulsion polymerization of chloroprene in the presence of not more than 3.5% by weight of a water soluble disproportionated abietic acid with the polychloroprene mixture containing at most 3.8% of said acid.

Abstract: Process for the production of microcapsules, characterized in that a reaction product of a diol or polyol which has a molecular weight of 400 to 10,000 with phosgene or a di- or polyisocyanate which contains at least two chloroformic acid ester or isocyanate groups per molecule is mixed with the substance with is required to be enveloped (core material) and this mixture, an at least bifunctional chain lengthening agent for the reaction product and an aqueous phase are introduced into a zone of high turbulence where the reaction product and chain lengthening agent react to form a high molecular weight polymer which encloses the substance which is to be enveloped to form microcapsules which are then separated.

Abstract: A process for the production of storable 2-chloro-1,3-butadiene/sulphur copolymers by peptization using sulphur containing petizing agents, wherein a compound corresponding to the following general formula:R.sub.1 --S.sub.n --R.sub.1whereinn represents an integer having a value of from 2 to 10, preferably from 3 to 8 and, more particularly, from 4 to 6; and R.sub.1 represents a C.sub.6 -C.sub.14 aryl radical, a C.sub.6 -C.sub.14 aryl-C.sub.1 -C.sub.3 alkyl radical or a heterocycle containing from 1 to 3 hereto atoms, such as N, which may be the same or different and which may optionally be substituted;optionally in combination with a nucleophilic substance, is added to the latex and peptized at from 5.degree. to 100.degree. C. and at pH of from 14 to 3.

Abstract: A catalyst consisting of (a) a cobalt compound, (b) an aluminium organic compound, (c) water and (d) a phosphite, characterized in that the phosphite is a compound corresponding to the formula (1): ##STR1## in which R represents a C.sub.3 -C.sub.20 alkyl radical, andR.sub.1 represents hydrogen or a C.sub.1 -C.sub.6 alkyl radical.Said catalyst can be used for polymerizing butadiene.

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: Branched polymers being producible by reacting an anion of a branched aromatic vinyl/diene block polymer with an aromatic polycarbonate or with a mixture of aromatic polycarbonates wherein at least 50% of the linear chains of the polycarbonate or mixture of polycarbonates consist of structural units corresponding to the Formula (1) ##STR1## in which X represents a C.sub.1 -C.sub.5 -alkylene or C.sub.1 -C.sub.5 -alkylidene radical.

Abstract: A mixture of polyolefin resins and partially crosslinked ethylene-propylene sequential polymer and/or ethylene-propylene-diene sequential polymer representing a so-called thermoplastic rubber having improved properties.

Abstract: A process for the preparation of a catalyst for the polymerization and copolymerization of cyclic olefins which have 4, 5, 7 or more ring carbon atoms and at least one olefinic double bond in the ring, fromA. at least one halide or oxyhalide of molybdenum, preferably with molybdenum in the oxidation state +5,B. at least one 2-halo alcohol andC. at least one aluminium compound in the molar ratio of a : b = 1 : 1 to 1 : 10 and a : c = 1 : 0.5 to 1 : 30,Characterized in that the molybdenum halide or oxyhalide and the 2-halo alcohol are reacted with the exclusion of solvents or in the presence of chlorinated solvents which are inert towards the molybdenum salt and in which the molybdenum salt is soluble to an extent of at least 0.01 molar, and the aluminium alkyl compound is added, optionally in the presence of the monomers.

Abstract: A stable oil-in-water emulsion wherein the discontinuous phase comprises a water-immiscible organic liquid, said emulsion being stabilized by from 0.02 to 5% by weight, based on the weight of organic solvent present, of a laminator, said laminator being a linear high molecular weight polymer whose dilute aqueous solutions having a concentration of up to 0.05% by weight, lower the resistance index in turbulent flow by at least 10% without promoting any change in viscosity.

Abstract: Polyoctenamers, in which more than 80% of the C=C-double bonds are in the cis-configuration, with a second order transition temperature of approximately -90.degree.C, a crystallisation temperature of from -30.degree. to +10.degree.C and a melting point of +10 to +40.degree.C and a process for its production, wherein cyclooctene and, optionally, up to 20% by weight, based on the monomer total, of another cyclic olefin are polymerised in an inert organic solvent at temperatures of from -50.degree. to +10.degree.C in the presence of a catalyst ofA. a tungsten halide or oxyhalide,B. an alcohol or a halogen substituted alcohol,C. an organometallic compound of aluminium, andD. boron trifluoride or boron trifluoride etherate.

Abstract: Ring opening polymerisation of cyclooctadiene-(1,5) (COD) optionally in an inert organic solvent on a catalyst ofA. a tungsten salt,B. a halogenated alcohol in which the halogen and OH group are attached to adjacent carbon atoms, and/or an epoxide and/or a halogenated phenol, andC. an organo aluminium compound and/or an aluminium halide.