Ems-chemie Ag

Ornulf Rexin

Manfred Hewel

Eduard Schmid

Georg Stoeppelmann

Jean-Jacques Linster

Etienne Aepli

Heinz G Hoff

Ralph Kettl

Volker Eichhorn

The present invention relates to reinforced polyamide molding materials with high notch impact strengths, comprising low viscous polyamides and flat glass fibers as a reinforcing medium, characterized in a polyamide matrix, comprising the following components: (A) 0 to 60 wt.-% of at least one aliphatic, partly crystalline polyamide with a solution viscosity, measured in m-cresol (0.5 wt-%), of &#x3b7;less than 1.9, (B) 0 to 60 wt.-% of at least one amorphous or microcrystalline polyamide based on aliphatic, cycloaliphatic or aromatic diamines, dicarboxylic acids, lactams and/or aminocarboxylic acids, preferably with 6 to 36 carbon atoms, or a mixture of such homopolyamides and/or copolyamides, wherein the components (A) and (B) fulfill the condition: (A)+(B)=20 to 60 wt.-% and that, in the case of a mixture of components (A) and (B), at least 50 weight parts aliphatic blocks (A) are present in the mixture, and a filler component, comprising: (C) 40 to 80 wt.-% flat glass fibers with elongated shape, and the glass fibers have a non-circular cross-sectional area and a size ratio of the main cross-sectional axis to the secondary cross-sectional axis of between 2 to 5, particularly between 3 and 4, and (D) 0 to 40 wt.-% particle like or layer like fillers, with the prerequisite that carbon fibers are excluded, wherein the polyamide molding materials optionally comprise up to 5 wt.-% of further usual additives and auxiliary agents (E), and wherein the weight of the components (A) to (E) sums up to 100%.

Polyamide molding materials reinforced with glass fibers and injection molded parts thereof

The present invention relates to reinforced polyamide molding materials which can be prepared from a polyamide blend and, for example, by compounding with cut fibers or continuous filaments on twin-screw extruders and have mechanical properties which are usually not compatible with one another, namely a combination of exceptionally high rigidity and strength and at the same time good toughness. Furthermore, a high heat distortion temperature (HDT) is achieved according to the invention. The thermoplastic polyamide molding materials according to the invention are suitable for the production of moldings or other semifinished products or finished articles, which can be produced, for example, by extrusion, injection molding, direct methods or direct compounding, in which the compounded polyamide molding material is processed directly by injection molding, or other deformation techniques.

Reinforced polyamide moulding materials

Filled polyamide molding materials, in particular polyamide molding materials with medium filler content, are producible from a polyamide blend and for example by compounding with chopped or endless fibers on two-screw extruders, and have a combination of reduced water absorption and good mechanical properties, which results in very good dimensional stability and reduced variation of the electrical properties of the produced molded part, such as an antenna housings of stationary or mobile communication devices. These thermoplastic polyamide molding materials are suitable for manufacturing molded parts and other semi-finished or finished parts, for example by extrusion, injection molding, pressing, direct process or direct compounding, respectively, wherein the compounded polyamide molding material is directly processed by injection molding or other shaping methods.

Filled polyamide molding materials showing a reduced water absorption

The present invention relates to thermoplastic polyamide moulding compositions which contain at least one copolyamide with at least 20% by weight polyamide 12 components and at least one aprotic compound selected from the group of N-alkylated, cyclic carboxylic acid amides with 5 to 7 ring elements and/or of urea derivatives, the alkyl rests of which are linear at the nitrogen or which form a linking of the two N-atoms, and a process for production of the moulding compositions. The thermoplastic polyamide moulding compositions are distinguished by the fact that no solid deposits are formed during thermoplastic conversion.

Thermoplastic polyamide moulding compositions

The present invention relates to the use of thermoplastic polyamide moulding compositions with reduced or strongly reduced formation of solid deposits and/or coverings during a thermoplastic conversion into commodity goods in discontinuous processes in particular injection moulding, and continuous processes such as the extrusion of films, fibers, tubes and jacketings containing at least 20% by weight polyamide and/or at least one copolymer with at least 20% by weight polyamide components.

Use of thermoplastic polyamide molding compositions with reduced formation of solid deposits and/or coverings

A catalyst solution for the anionic polymerization of lactones and/or lactams comprises a salt of at least one compound of the general formula I In this formula (I), Ris H or an aliphatic, cycloaliphatic or aromatic radical with 1 to 12 C atoms which can also have heteroatoms or hetero groups, the radical R, which is the same or different, is H, halogen, C&#x2013;C-alkyl, ethoxy or wherein said solvation agent S comprises N-methylpyrrolidone, N-octylpyrrolidone, N-cyclohexylpyrrolidone, N-octylcaprolactam, tetrabutyl urea or mixtures thereof methoxy, and n=1, 2 or 3, and wherein the salt is dissolved in an aprotic solvation agent S.

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Ornulf Rexin