Abstract: Zinc dithiocarbamates are obtained in especially readily filterable form and high purity when zinc salts are first added, in aqueous solution, to the secondary amines underlying the zinc carbamates, so that a zinc salt complex of the amines is formed, and carbon disulfide and then sodium hydroxide solution are then introduced, with stirring, into the aqueous suspension so obtained, the temperatures being maintained in the range from room temperature to the boiling temperature of carbon disulfide until the reaction has completely finished.

Abstract: The present invention relates to adhesives for increasing the adhesion between rubbers and reinforcing materials based on metals, organic polymers or ceramic materials and the use of adhesives to produce rubber mixtures or rubber vulcanizates containing reinforcing materials.

Abstract: This invention relates to a process for the selective preparation of cis-2,6-dimethylpiperazine by reacting (i) a diisopropanolamine mixture comprising compounds having the formulas HN(CH2CH(OH)CH3)2, HN(CH(CH3)CH2OH)2, and HN(CH(CH3)CH2OH)(CH2CH(OH)CH3) or (ii) 1,2-diaminopropane with ammonia and hydrogen in the presence of a hydrogenation catalyst.

Abstract: This invention relates to a process for the selective preparation of cis-2,6-dimethylpiperazine by reacting (i) a diisopropanolamine mixture comprising compounds having the formulas HN(CH2CH(OH)CH3)2, HN(CH(CH3)CH2OH)2, and HN(CH(CH3)CH2OH)(CH2CH(OH)CH3) or (ii) 1,2-diaminopropane with ammonia and hydrogen in the presence of a hydrogenation catalyst.

Abstract: This invention relates to a process for the selective preparation of cis-2,6-dimethylpiperazine by reacting (i) a diisopropanolamine mixture comprising compounds having the formulas HN(CH2CH(OH)CH3)2, HN(CH(CH3)CH2OH)2, and HN(CH(CH3)CH2OH)(CH2CH(OH)CH3) or (ii) 1,2-diaminopropane with ammonia and hydrogen in the presence of a hydrogenation catalyst.

Abstract: Zinc dithiocarbamates are obtained in especially readily filterable form and high purity when zinc salts are first added, in aqueous solution, to the secondary amines underlying the zinc carbamates, so that a zinc salt complex of the amines is formed, and carbon disulfide and then sodium hydroxide solution are then introduced, with stirring, into the aqueous suspension so obtained, the temperatures being maintained in the range from room temperature to the boiling temperature of carbon disulfide until the reaction has completely finished.

Abstract: The plasticity of ceramic compositions and dispersions can be improved by addition of at least one polymer (I) with recurring succinyl units. This effect can be reversed by addition of a setting accelerator (II); preferred setting accelerators are polymers (II) of the polyalkylenepolyamine type.

Abstract: The invention relates to a process for preparing polymers having repeating succinyl units, especially polysuccinimide and polyaspartic acid, with increased M.sub.W values at non-increased, moderate synthesis temperatures and at the same time without increased polycondensation times, using maleic anhydride and ammonium carbonate plus a catalyst.

Abstract: Polymers with repeating succinyl units, in particular polysuccinimide and polyaspartic acid, are prepared using triammonium salts, in particular triammonium phosphates.

Abstract: Compositions comprising new halogenated butyl rubbers with a defined, low content of halogen, a defined content of non-halogenated double bonds and a defined content of anti-agglomeration/vulcanisation control agents and containing polymer compounds comprising special amidines, mercapto or zinc mercapto compounds and polymers possess outstanding mechanical and physiological properties, so that they are suitable for the production of tyres, particularly tyre inner liners, tyre sidewalls and tyre treads.

Abstract: The polymer compounds according to the invention prepared from specific amidines, zinc mercapto compounds and elastomers are ideally suitable for the production of thermally stable rubber vulcanisates containing halogen. The vulcanisates of rubbers containing halogen obtained by means of the polymer compounds are distinguished by a reduced tendency towards unwanted post-vulcanization and, at elevated storage temperatures, are resistant to thermal and oxidative degradation.

Abstract: The polymer compounds according to the invention, comprising special amidines, mercapto compounds and elastomers, are mainly suitable for the production of thermally stable, halogen-containing vulcanized rubbers. The vulcanized, halogen-containing rubbers obtained by means of the polymer compounds are distinguished by a reduced tendency to undergo unwanted subsequent vulcanization and are stable towards thermal and oxidative degradation at high storage temperatures.

Abstract: The present invention relates to polycarbonate molding compositions containing polycarbonates, stabilizers of general formula ##STR1## and optionally polypropylene glycols. The present invention also relates to the use of these molding compositions for the production of articles for medical applications.

Abstract: A thermoplastic molding composition stabilized against .gamma.-rays and its application for manufacture of medical equipment is disclosed. The composition contains an aromatic polycarbonate and(i) dialkyl and/or dicycloalkyl monosulfides or polysulfides in an amount of 0.001 to 5 weight %, and optionally(ii) aliphatic or cycloaliphatic monoalcohols or polyalcohols or their derivatives in an amount of 0.001 to 2 weight %said percent being relative to 100 weight % of aromatic polycarbonate.

Abstract: The invention relates to a new process for the preparation of known .beta.-halogeno-tert.-alkylcarboxylic acid chlorides of the general formula (I) ##STR1## in which X represents chlorine,Y represents hydrogen or chlorine,R.sub.1 represents in each case straight-chain or branched lower alkyl or halogeno alkyl andR.sub.2 represents in each case straight-chain or branched lower alkyl or halogeno alkyl or optionally halogen- and/or trifluoromethyl-substituted phenyl,where tert.-alkylcarboxylic acid chlorides of the general formula (II) ##STR2## in which R.sup.1 and R.sup.2 are defined as above, are reacted with elementary chlorine optionally under irradiation or in the presence of free-radical catalysts.

Abstract: The invention relates to a process for the preparation of known .beta.-halogeno-tert.-alkyl isocyanates of the formula ##STR1## in which X represents chlorine,Y represents hydrogen or chlorine,R.sub.1 represents in each case straight-chain or branched alkyl or halogenoalkyl andR.sub.2 represents in each case straight-chain or branched alkyl, halogenoalkyl or optionally halogen- and/or trifluoromethyl-substituted phenyl,where tert.-alkyl isocyanates of the formula (II) ##STR2## in which R.sub.1 and R.sub.2 have the meaning given above,are converted to the corresponding tert.-alkylcarbamoyl chlorides by means of hydrogen chloride gas, these are reacted with elemental chlorine under irradiation or in the presence of catalysts, and finally the .beta.-halogeno-tert.-alkyl isocyanates are liberated by dehydrohalogenation at elevated temperature.

Abstract: The invention relates to a new process for the preparation of known .beta.-halogeno-tert.-alkyl isocyanates of the formula ##STR1## in which X represents chlorine,Y represents hydrogen or chlorine,R.sup.1 represents in each case straight-chain or branched alkyl or halogeno alkyl andR.sup.2 represents in each case straight-chain or branched alkyl or halogeno alkyl or optionally halogen-and/or trifluoromethyl-substituted phenyl,where tert.-alkyl isocyanates of the formula (II) ##STR2## are reacted with chlorine, optionally under irradiation or in the presence of catalysts, in a suitable apparatus.

Abstract: The metal oxide vulcanization of polychloroprene in the presence of amidine compounds, but in the absence of magnesium oxide, leads to vulcanizates which are capable of withstanding high temperatures, even under dynamic stress.

Abstract: The elminination of sulfur from bis-(dialkoxythiophosphoryl)-tetrasulfides to bis-(dialkoxythiophosphoryl)-trisulfides on certain silicate fillers, carbon black and aluminium oxide is quantitative.

Abstract: The strength of the bond between a metal and vulcanized rubber may be increased by a bonding agent containing at least one organic cobalt compound and at least one boric acid ester.