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 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 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: 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: 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: 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: In the method of increasing the detonation energy in an electromagnetic fuze system of a low-acceleration projectile a detonator generator which is held in an inactive or rest position by an elastic force, is accelerated along a predetermined travel path in the rear portion of a housing at the onset of the firing acceleration. The detonator generator is accelerated such that the detonator generator impacts upon an impact body which is provided with a central bore. As a result, a reaction member of the detonator generator inactivates its mechanical safety device and is accelerated, thus providing the detonation energy. In the retarding phase the detonator generator is returned into its original position by means of the elastic force and thus is ready for detonation. In comparison to known methods and apparatus there can thus be dispensed with an external power supply, whereby safety is increased with respect to maintenance, tests and firing.
Abstract: A method for reducing the volatile component content of crude high molecular weight polyesters containing said component. The method comprises first contacting the crude polyester with steam, or a mixture of steam and inert gas and/or air, at a temperature of 100.degree. to 245.degree. C. to form a partially treated polyester. The second step comprises further contacting the product of the first step with an inert gas and/or air at a temperature of 200.degree. to 245.degree. C. to produce the purified polyester.In particular, the method is intended for use with such polyesters as polyethylene terephthalate which contains acetaldehyde as the undesired volatile component.A new method of analysis useful in the foregoing process is also disclosed. The products of the new process are primarily intended for use in the manufacture of plastic bottles or similar containers for use in the foodstuffs industry.
Type:
Grant
Filed:
April 21, 1983
Date of Patent:
May 27, 1986
Assignee:
EMS-Inventa AG
Inventors:
Hussain El-Ghatta, Hans-Werner Philipp, Richard Sailer, Bruno Domeisen