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

Reinforced polyamide molding materials with a high notch impact strength, comprising low viscous polyamides and flat glass fibers as a reinforcing medium, characterized by

• a polyamide matrix, comprising the following components:
• (A) 20 to 60% by weight of at least one aliphatic, partly crystalline polyamide with a solution viscosity ηrel, measured in m-cresol (0.5 wt-%), of more than 1.3 to less than 1.9, optionally of more than 1.35 to less than 1.9, and more preferably optionally of more than 1.4 to less than 1.9,
• (B) 0 to 50% by weight, preferably optionally 0 to 20 wt.-%, more preferably 0 to 15 wt.-%, of at least one amorphous or microcrystalline polyamides 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 Homo polyamides and/or copolyamides,
• with the prerequisite 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, optionally 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 adjuvants (E), and
• wherein the weight of the components (A) to (E) sums up to 100%.