Abstract: Secondary products formed in the chlorination of butadiene can be reacted with phenols in the absence of iron catalysts to form novolak-like phenolic resins in such a way that the tetrachlorobutane present in the secondary products does not react. It can be distilled off with the excess phenol and isolated in pure form from the distillate obtained.

Abstract: Vulcanizates of polychloroprene materials containing fluorinated polyolefin have a decreased rebound elasticity without having a significantly adverse effect on the mechanical properties.

Abstract: Ethylene/acrylonitrile high pressure solvent-free polymers with reduced tackiness may be obtained by the copolymerisation of small quantities of acryloyl or methacryloyl compounds.

Abstract: This invention relates to mixtures of polychloroprene elastomers which are distinguished by their good processibility and excellent cold resistance.

Abstract: Rubber mixtures of hydrogenated nitrile rubber and ethylene/acrylonitrile copolymers, which contain copolymerized units of compounds with at least two (meth-)acryloyl groups, are easy to process and give vulcanized materials of high solvent resistance without any deterioration in the mechanical properties.

Abstract: The combination of unmodified resinic acids and direct peptization in the production of sulfur-modified polychloroprene leads to a favorable ratio of elasticity to viscosity.

Abstract: High molecular weight, gel-free ethylene/vinyl acetate copolymers may be prepared by the process of solution polymerization if a particular relationship of temperature/pressure is observed.

Abstract: Toluene-soluble, sulphur-modified polychloroprene is obtained by emulsion copolymerization of chloroprene, sulphur and optionally further monomers which are copolymerizable with chloroprene and sulphur using a peroxy activator and subsequent working-up by stabilizing, stopping, degassing and isolating without separate peptization, in that polymerization is carried out in the presence of dithiocarbamates and/or xanthogenates and the activator is metered in continuously or batch-wise during the course of polymerization.

Abstract: The invention relates to a polychloroprene rubber which shows advantages over the prior art in the sum total of its performance properties, namely vulcanization rate, tensile strength, elongation at break, modulus, tear propagation resistance and thermal stability of the vulcanizate.

Abstract: The present invention relates to thermoplastically processible polymer materials with good mechanical properties and high flame resistance.

Abstract: This invention relates to fabric or cord coated as an individual filament or as the finished carrier material with hydrogenated nitrile rubber and the laminated materials prepared therefrom with the vulcanized rubber. It, furthermore, relates to a latex of said hydrogenated nitrile rubber.

Abstract: An improved process for the preparation of polychloroprene by the emulsion (co)polymerization of chloroprene and optionally other monomers capable of copolymerization with chloroprene, using a peroxo activator, and subsequent working up of the product by stopping the reaction, stabilizing, degassing and isolating the product, characterized in that polymerization is carried out in the presence of dithiocarbamates and/or xanthates and 0 to 0.5% by weight of sodium .beta.-anthraquinone sulphonate.

Abstract: The invention relates to a process for the preparation of partially hydrogenated nitrile rubbers with defined residual double bond contents of between 2.0 and 5.0%, preferably 3.0 and 4.5%.

Abstract: An elastomeric mass of polychloroprene sol and polychloroprene gel in proportions in the range of 95:5 to 25:75% by weight in which the polychloroprene sol is free from sulphur and the polychloroprene gel used is a sulphur-containing gel with xanthate or carbamate functions has better processing characteristics than the pure sol component without the expected deterioration in the mechanical properties of the vulcanisates prepared from the mass.

Abstract: A carrier element for an IC module for incorporation into data carriers, in which the IC module is connectd with contact surfaces by means of leads, and the contact surfaces are designed for direct contacting.In order to protect the Integrated Circuit against destruction due to static charges, measures are provided to dissipate outside the circuit any portions of charge that may occur. In one embodiment, all terminals of the circuit have a low resistance connection with each other. The connection is suspended during each operational phase and is then restored. In a further embodiment, the terminals are bridged by spark gaps. This protective step is advantageous in that it is not necessary to remove and then restore the bridging.

Abstract: A method of cleaning contact surfaces in connection with integrated circuits embedded in identification cards. The cleaning is carried out during insertion of the card or in the testing position of the card by means of special cleaning devices or the contact elements themselves.The cleaning can be triggered or regulated as a function of the testing of the operability of the contacts.

Abstract: An identification element in the form of an integrated circuit, for example for identification cards and similar data carriers. The element contains a confidential code which is known only by the lawful owner of the card and is compared in the integrated circuit with a typed in code.To prevent the unauthorized use of the card, an independent circuit (1), which is isolated from the rest of the circuit, is provided in the element to detect incorrect code inputs and then render the card inoperable for a certain period of time. The off-period can be set as a function of the possible code permutations in such a way that it is practically impossible for the fraud to find out the correct code within the normal period of validity of the card.The circuit (2) can also be used to maintain the operability of the card for a predetermined period of time when the correct code has been typed in and without any further inputs.