Abstract: Linear saturated copolyesters of terephthalic acid, isophthalic acid, butanediol, and one or more aliphatic diols having at least 13 carbon atoms used as adhesives for the formation of wash-resistant bonds especially for temperature-sensitive materials. Preferably, the melting points of these adhesive compositions are from 50.degree. to 170.degree. C. and their relative viscosities, measured as 1% solutions in meta-cresol at 20.degree. C., are 1.40 to 1.80.

Abstract: Extruded pipes of thermoplastically processable polymers are wound cold around a mandrel and thereafter subject to thermal fixing. During or before winding, the pipe is twisted in a direction opposite to that of the helix formation, about its longitudinal axis, preferably through angles of 5.degree. to 360.degree. per coil. The resilience of the coiled pipe is surprisingly improved to the point where the resilience factor R approaches 1.0.

Abstract: A process for the preparation of crosslinked shapes from a polymer which consists of reacting a starting polyamide with a particular silane. The polyamide should have at least 30% by weight of branched polymer chains, but these may be furnished by adding branching agents to the monomers before or during polymerization. After the reaction with silane has taken place, the polymer is molded or otherwise formed into desired shapes and brought into contact with water. This causes three dimensional crosslinking of the polymer and provides improved mechanical and fire resistant properties to the finished product. Moreover, the finished product may be formed by the usual methods of shaping without any particular treatment being required.

Abstract: A composition having at least 50% by weight polyamide and a liquid crystalline polymer capable of forming an optically anisotropic melt above 200.degree. C. Such compositions are transformed by deformation at temperatures below the melting point and above the glass transition temperature of the polyamide. Shaped bodies made thereby have excellent tensile strength and elongation at break characteristics.

Abstract: A connector including a male member and a female member adapted to mate therewith. The female member is hollow and has an annulus defining a plane substantially perpendicular to its axis. There is a substantially cylindrical hollow nozzle within the annulus and the nozzle has an outer diameter smaller than the inner diameter of the annulus, thus defining a space therebetween. A hollow portion extends away from the male member and is being substantially coaxial with the nozzle. The male member is generally cylindrical and hollow. It is provided with a collar having an outer diameter smaller than the inner diameter of the annulus and an inner diameter larger than the outer diameter of the nozzle, whereby the collar occupies the space. The male and female members, when connected, form a passage for flow of fluids therethrough.

Abstract: A method of spinning filaments from a melt which comprises flowing said melt through openings in a nozzle plate to form a stream of said filaments, directing a coolant radially outwardly from the center of said stream through a porous wall of a dispersing head provided with a downstream baffle adjusted to partially reduce the inside pressures of the coolant adjacent to the baffle to a value lower than the outside pressure, the resistance of said coolant caused by the wall porosity satisfying the relationship1.43.times.10.sup.6 m+2222 m.sup.2 =p=-96.96 m+20202 m.sup.2wherein m is the rate of flow of said coolant across the area of said porous wall in kg/h-cm.sup.2, and p is the pressure drop in Pa.

Abstract: An apparatus for spinning filaments from a melt has a nozzle plate with a plurality of passages through which the melt flows to form a stream of filaments, a downstream dispersing head in the stream in the form of a cylinder with its axis parallel to the stream of filaments and having an upstream end and a downstream end, a coolant source connected to the dispersing head having a porous wall parallel to the filament stream whereby coolant passes through the wall and impinges on the filaments and a baffle in the dispersing head to reduce the coolant pressure adjacent to the baffle, a resistance to the coolant flow satisfying a specific formula which avoids the prior art problems.

Abstract: Molding compositions of thermoplastic plasticizer-containing polyamides exhibit greatly reduced migration of plasticizer or no migration at all due to having 0.1 to 20% by weight of sterically hindered carbodiimides of the formulaR.sub.1 --N.dbd.C.dbd.N--[R.sub.2 --N.dbd.C.dbd.N].sub.2 --R.sub.3wherein n is 0 to 100; R.sub.1 and R.sub.3 are individually a monovalent radical taken from the class consisting of aliphatic having 1 to 20 carbon atoms, cycloaliphatics having 6 to 20 carbon atoms, and aromatics having 8 to 20 carbon atoms and also having substituents; and R.sub.2 is a divalent radical taken from the class consisting of aliphatics having 1 to 20 carbon atoms, cycloaliphatic having 6 to 20 carbon atoms, and aromatics having 8 to 20 carbon atoms and also having substituents.

Abstract: A flame-resistant polyamide molding composition comprising a thermoplastic polyamide, a particular form of magnesium hydroxide, an olefin polymer having at least one functional group, and reinforcing fibers inert to the composition. The composition can be processed at temperatures above 300.degree. C. without degradation or decomposition, can be processed to produce bodies having thin walls and high rigidity, and is of particular use in the electric and electronic fields. Moreover, the bodies possess excellent flame-retardant characteristics and form no droplets on contact with heat or an open flame. Therefore, molded parts prepared therefrom retain their functional integrity to a high degree, even in the case of fire because no corrosive gases are evolved, thereby minimizing the formation of short circuits.

Abstract: An adhesive copolyamide composition having a dry powder DSC melting point of at least 100.degree. C., a glass transition temperature above 60.degree. C., a dry powder softening point of at least 100.degree. C., preferably a water content after storage in water of more than 20% by weight, and a wet softening point of less than 100.degree.. Such compositions exhibit softening points and heat resistances in excess of 100.degree. C. and can be processed and set at substantially lower temperatures. No low molecular weight additives are required nor are any solvents necessary. The compositions are comparable in their heat-resistance, softening points, and bond strength to conventional high performance hot melt adhesives.

Abstract: The invention relates to thermoplastically processible mixtures comprising from 0 to 95% by weight of polyamide and from 50 to 5% by weight of polyamide elastomers, especially for the production of polymeric protective layers for optical waveguides. Optical waveguide cables can be produced at higher rates with these mixtures than when using, for example, polyamide 12 alone as the protective layer. The optical waveguide cables thus obtained are distinguished by comparatively low attenuation values even with high mechanical loads.

Abstract: Heat-resistant, polymer-containing, solvent-free adhesive compositions are prepared by reacting a novel mixture of saturated polyester or copolyester with capped isocyanate under the influence of temperature and, if necessary, catalysts, with evident viscosity increase, with cross-linking as appropriate.The adhesive compositions combine the process-technical properties of low-viscosity melt-adhesives and the strength, tenacity and stability of cross-linked duroplasts or high-viscosity thermoplasts. Subsequent working and protection from explosion are not necessary. Use is possible in each known art for melt-adhesives, e.g. as paste, powder, melt, textiles, or flat structures. In addition, the compositions are suitable as melt coatings or for injection moulding reactions.

Abstract: Transparent copolyamides with very good processibility, very good mechanical properties, excellent transparency and hydrolysis stability in boiling water, and alloyability with other polyamides, are obtained through polycondensation of alkyl derivatives of dicycane and additional polyamide-forming components, together with isophthalic acid and an .omega.-aminocarboxylic acid or its lactam with more than 8 C-atoms, or salts thereof, or a stoichiometric mixture of an aliphatic dicarboxylic acid and an aliphatic diamine.The copolyamides of the invention are excellently suitable for the production of molded articles, thanks to their low processing viscosity.

Abstract: A connector having a male part and a female part, the latter having a hollow body and a hollow housing portion connected thereto to form a passage for flow of fluid. The portion is provided with at least one detent on the inside wall and has an opening on the end remote from the body. The detent is provided with a sloping surface which flares in the direction of the opening and also has an abutment surface facing toward the body.The male part has a front end which is inserted into the opening and carries an inclined surface which is complementary to the sloping surface of the female part. In a manner analogous to the female part, the male part is provided with an abutment facing away from the front end and adapted to abut the abutment surface on the female part when the connector is in closed position.

Abstract: A process for the preparation of moulded bodies of thermoplastic polyamides, which comprises intensively mixing a polyamide and a masterbatch, converting the mixture by conventional thermoplast processing to moulded bodies and, before use, conditioning the bodies by contact with ambient moisture or, briefly, with water, in which the masterbatch contains at least 5% by weight of a silane substituted by one, 2 or 3 hydrolysable radicals and a functional group which can undergo a chemical reaction, to form a bond, with amino groups and/or carboxyl groups and/or amide groups in the polyamide chain.

Abstract: A nozzle plate having a plurality of passages is adapted to permit a melt to flow therethrough to form a stream of filaments. A dispersing head is located downstream of the plate and in the filament stream. The head is substantially in the form of a cylinder with its axis substantially parallel to the stream. An inlet for coolant (preferably air) connects a source thereof with the head. The wall of the head is porous, thereby permitting the coolant to pass through the wall and impinge on the filaments.

Abstract: A method for the preparation of block polyurethane amides in a melt by the reaction of(a) a linear polyamide having terminal carboxylic acid ester groups and which melts at not more than 210.degree. C.; and(b) a polyurethane having hydroxyl groups at its chain ends;at a temperature of 160.degree. C. to 240.degree. C., and in the presence of a trans-esterification accelerator.

Abstract: Transparent copolyamides with very good processibility, very good mechanical properties, excellent transparency and hydrolysis stability in boiling water, and alloyability with other polyamides, are obtained through polycondensation of alkyl derivatives of dicycane and additional polyamide-forming components, together with isophthalic acid and an .omega.-aminocarboxylic acid or its lactam with more than 8 C-atoms, or salts thereof, or a stoichiometric mixture of an aliphatic dicarboxylic acid and an aliphatic diamine.The copolyamides of the invention are excellently suitable for the production of molded articles, thanks to their low processing viscosity.

Abstract: The pole body contains an insulating carrier element made of plastic and provided with elevations on one side and on an other side of the insulating carrier element. The elevation on the other side partially protrudes into a metal layer applied to the insulating carrier element and conjointly therewith forms a planar surface forming the two poles of the fuze. The pole body is manufactured by applying the metal layer to the insulating carrier element which is provided with wedge-shaped elevations. Subsequently, the tips or ridges of the elevations are removed to such an extent that planes including the metal layer are formed. One of the elevations constitutes an interrupted elevation and a number of detonating bridges is formed, depending on the number of interruptions in the elevation between the ends of the elevation bounded by the interruptions thereof. The pole body is used in electric fuze devices which have a reaction time in the microsecond range and thus are suited for use with ammunition.

Abstract: Thermoplastic polyamide molding materials containing impact resistance-providing additives, which are reinforced with glass fibers and are colored with dyes and pigments, comprise a mixture of components A and B.Component A comprises glass fiber-containing polyamide and component B comprises polyamide with impact resistance-providing additives and can also contain dyes, pigments, heat and light-stabilizers, as well as processing agents.Due to the separate addition of the glass fibers and the impact resistance-providing additives, pigments, etc. to the polyamide, the conventional reduction in mechanical properties, such as impact resistance and notch toughness, on the addition of all the other components to the polyamide, is surprisingly prevented.