Abstract: The invention relates to a cable closure for optical-fiber cables, preferably optical-fiber minicables or optical-fiber microcables, with cable lead-in units, which are arranged perpendicularly with respect to the axis of the closure body, and it is possible for the closure to be fitted vertically into a core hole made into the earth or into road surfacings. On account of laid-in excess lengths of optical waveguide, splice organizers in the interior of the closure body can be taken out upwards for service work. Preferably, the excess lengths of optical waveguide are carried in a protective tube, which is deposited in a plurality of loops in the interior of the closure.

Abstract: A cable sleeve for light waveguides is constructed as a flat plate member in which a circular groove extends and has inlets extending tangentially from the groove. The cable sleeve can receive excess lengths of the cable as well as splices which excess lengths and splices are received in the circular groove.

Abstract: A splice protection device is constructed for acceptance of a pair of light waveguides, with the splice location being optimally sealed by elastic holders having an adhesive film. The elastic splice protection device can be utilized in a bent shape, so that the dimensions of a cassette and other receptacle devices can be designed to be smaller.

Abstract: A cap sleeve for a light waveguide cable for universal employment in a light waveguide network receives a fastening frame, which provides a storage space for excess lengths of uncut light waveguide multi-fiber bundles, and provides a splicing block on which individual splicing cassettes can be removed by a tilting motion.

Abstract: In a frame, a cassette module for light waveguides contains a plurality of cassettes swivellable around an axis. Connecting leads or connecting fibers thereof are conducted over a vertically residing guide backplane.

Abstract: In a process for imidizing an alkyl methacrylate polymer by reaction with a nitrogen-containing imidizing agent, the formation of carboxyl and anhydride groups is suppressed when a portion of the imidizing agent is added only after the previously added imidizing agent has been reacted at least partially, and particularly when the reaction with the imidizing agent is terminated before the polymer has been completely imidized.

Abstract: High-temperature-resistant, thermoplastically processable polyarylene ethers with repeating structural units of the general formula ##STR1## wherein A represents 4,4'- or 4,4"-benzophenone units of the formula ##STR2## with z being 0 or 1, B represents 9,9-bis(4'-phenyl)fluorene units of the formula ##STR3## and C represents 2,2-bis(4-phenyl)propane units of the formula ##STR4## which are linked to one another in etherlike fashion through oxygen atoms, the composition of the polyarylene ethers being determined by m and n, the molar ratio of which ranges from 30:70 to 90:10, and wherein the sequence of the segments containing B or C may be random.

Abstract: A method for making resinous phosphorus-containing polyarylene ethers of the structure ##STR1## wherein R taken alone is hydrogen or R R taken together are a covalent single bond, oxygen, sulfur, or a sulfonyl, carbonyl, methylene or isopropylidene bridge;R' is alkyl or aryl;R" is a single bond, oxygen, sulfur, or an organic group having from 5 to 15 carbon atoms whose free valences emanate from quaternary carbon atoms;E is an end group which is chlorine, hydrogen, alkyl, aryl, or acyl; andn has an average value of at least 10,by polycondensing appropriate bis(chlorophenyl)phosphine oxides with appropriate bisphenols at an elevated temperature in the presence of alkali in reaction times of at least 10 hours, and certain resinous ethers produced by this method.

Abstract: What is disclosed is a method for making an amide of acrylic acid or of methacrylic acid by the reaction of an alkyl ester of acrylic acid or of methacrylic acid with an amine at a temperature between 50.degree. C. and 180.degree. C., whereby the reaction with the amine is carried out in the presence of a catalytic amount of a compound of a metal of Group IVB of the periodic table of the elements or of a compound of lead, zinc, or tantalum.

Abstract: The invention is directed to a container for receiving and safely storing radioactive or other materials damaging to living organisms, especially such materials as vitrified radioactive fission products or irradiated nuclear reactor fuel elements. The container includes a vessel and a sealing cover. The vessel has a circular opening at one of its ends for receiving the materials to be stored therein, and a sealing cover is seated in this opening to tightly seal the container. In order to obtain a container of the kind which has the required high impermeability to gas, the open end of the inner bore of the vessel is widened to define a conical surface. A sealing cover is pressed into the vessel at this conical surfce. The sealing cover has a peripheral surface which converges toward the interior of the vessel and which has a taper corresponding to that of the conical surface of the vessel.

Abstract: UV absorbing compounds, susceptible to free-radical polymerization, of the formula ##STR1## wherein R is alkyl having from 4 to 12 carbon atoms of which not more than 6 are present in a linear chain, and in particular2-(2'-hydroxy-3'-methacrylamidomethyl-5'-tert-octylphenyl)benzotriazole, and polymers thereof.

Abstract: What is disclosed is a continuous one-step method for the preparation of isobutyric acid or a lower alkyl ester thereof by the Koch synthesis, which method comprises reacting propylene, carbon monoxide, and water or a lower alcohol, in the gaseous and liquid phases, in the presence of hydrogen fluoride as a Koch catalyst, at a temperature between 80.degree. C. and 160.degree. C., at a dwell time of the liquid phase of less than 20 minutes, and with a high degree of backmixing, while maintaining the content of propylene in the reaction mixture at less than one percent by weight of the liquid phase, wherein all or part of the propylene, carbon monoxide, and water or lower alcohol can be replaced by binary addition compounds formed pairwise between these materials. In the alternative, isopropylformiate can be continuously rearranged in the presence of hydrogen fluoride to produce isobutyric acid.

Abstract: UV absorbing compounds, susceptible to free-radical polymerization, of the formula ##STR1## wherein R is alkyl having from 4 to 12 carbon atoms of which not more than 6 are present in a linear chain, and in particular 2-(2'-hydroxy-3'-methacrylamidomethyl-5'-tert-octylphenyl)benzotriazole, and polymers thereof.

Abstract: What are disclosed are resinous polyarylene esters containing more than 1 percent by weight of phosphorus and having the formula--CO--A--CO--O--B--O.sub.n, wherein B is a bivalent aromatic group and A represents at least in part--phenylene--P(O).sub.x (R)--phenylene--,wherein R is lower alkyl or aryl and x is 0 or 1, the rest, if any, of A having the formula given for B, which esters have decomposition temperatures of at least 450.degree. C. and can be sintered or thermoplastically processed into sheets or other shapes having good self-extinguishing properties.

Abstract: What are disclosed are phosphorus-containing polyarylene esters,--O--A--O--CO--B--CO].sub.n,wherein A represents at least in part groups of the structure ##STR1## wherein x is 0 or 1 and R is aromatic or aliphatic, and wherein B represents either two different aromatic groups or at least one group with the structure --C.sub.6 H.sub.4 --R'--C.sub.6 H.sub.4 --, wherein R' is a bridging link of the group --O--, --S--, --SO.sub.2 --, --CO--, or isopropylidene, and wherein n is greater than 20, which esters have a phosphorus content of over 1 weight percent, are distinguished by improved thermoplastic processability, and are prepared by condensation of HO--A--OH, for example with ClCO--B--COCl in the presence of a base.

Abstract: What is disclosed is a continuous one-step method for the preparation of isobutyric acid or a lower alkyl ester thereof by the Koch synthesis, which method comprises reacting propylene, carbon monoxide, and water or a lower alcohol, in the gaseous and liquid phases, in the presence of hydrogen fluoride as a Koch catalyst, at a temperature between 80.degree. C. and 160.degree. C., at a dwell time of the liquid phase of less than 20 minutes, and with a high degree of backmixing, while maintaining the content of propylene in the reaction mixture at less than one percent by weight of the liquid phase, wherein all or part of the propylene, carbon monoxide, and water or lower alcohol can be replaced by binary addition compounds formed pairwise between these materials. In the alternative, isopropylformiate can be continuously rearranged in the presence of hydrogen fluoride to produce isobutyric acid.

Abstract: What is disclosed is a method for making amides of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl,R.sub.3 is straight-chain or branched alkyl or unsubstituted or substituted aryl, andR.sub.4 is hydrogen or straight-chain or branched unsubstituted or substituted alkyl, which comprises reacting an ester of the formula ##STR2## wherein R.sub.2 is alkyl having 1 to 6 carbon atoms, with heating and under autogenous pressure, in a homogeneous phase, with an amine of the formula ##STR3## said amine being present in an amount which is stoichiometrically deficient up to an amount which is in small stoichiometric excess with respect to said ester.

Abstract: What is disclosed is the method for making an N-substituted acrylamide or an N-substituted methacrylamide which comprises reacting an alkyl ester of acrylic acid or of methacrylic acid with an aliphatic amine or with an aromatic amine at a temperature between 50.degree. C. and 180.degree. C. in the presence of a catalytic amount of a dialkyl tin oxide.

Abstract: What is disclosed is a foamable polymer composition comprising(A) a copolymer of 20-99.99 percent by weight of a member selected from the group consisting of acrylic acid and methacrylic acid, 0-79.99 percent by weight of a further ethylenically unsaturated monomer copolymerizable therewith, and 0.01-5 percent by weight of a member selected from the group consisting of metal salts of acrylic acid and methacrylic acid, and(B) a foaming agent compatible with said copolymer, methods for making such a composition, polymer foams prepared therefrom, and laminates of such foams with resin-impregnated fiber glass mats.

Abstract: In the method of making a compound of the formula ##STR1## wherein X is carboxyl, a carboxylic acid ester group --COOR.sub.2, or cyano, by reaction of a compound of the formula CH.sub.3 CH.sub.2 X with methylal in the presence of a catalyst, the improvement wherein said catalyst is a catalyst system which consists essentially of (1) silicon dioxide dosed with a basic component and (2) a member selected from the group consisting of aluminum oxide and titanium dioxide.