| abstract |
The present invention relates to reinforced polyamide molding compositions having high impact strength, comprising low-viscosity polyamides and flat glass fibers as a reinforcing medium, characterized by a polyamide matrix containing the following components: (A) 0 to 60% by weight of at least one aliphatic, partially crystalline polyamide having a solution viscosity, measured in m-cresol (0.5% by weight), of η rel 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 having 6 to 36 carbon atoms, or a mixture of such homopolyamides and / or copolyamides in which components (A) and (B) satisfy the conditions (A) + (B) = 20 to 60% by weight and that, in the case of a mixture of components (A) and (B), at least 50 parts by weight of aliphatic building blocks (A) are present in the mixture, and a filler component containing: (C) 40 to 80% by weight flat glass fibers of elongated shape, the glass fibers having a non-circular cross-sectional area and a dimension ratio of the major cross-sectional axis to the minor cross-sectional axis of between 2 to 5, especially 3 to 4, and (D) 0 to 40% by weight of particulate or layered fillers, with the proviso that carbon fibers are excluded. - Where the polyamide molding compositions optionally contain up to 5 wt .-% further conventional additives and excipients (E), and - Where the weight percent of components (A) to (F) together give 100%. |