Patent ID: 8859662

Claim:
A polyamide moulding material based on semicrystalline polyamides for production of LED housings or housing components with high strength, high long-term reflectivity and low blistering tendency, consisting of (A) 40 to 68% by weight of at least one semiaromatic polyamide based on at least 70 mol % of aromatic dicarboxylic acids and at least 70 mol % of aliphatic diamines having 4 to 18 carbon atoms and having a melting temperature (T m ) in the range from 270° C. to 340° C., (B) 15-25% by weight of titanium dioxide particles, (C) 7-17% by weight of glass fibres which have a round or noncircular cross-sectional area, or a mixture of such glass fibres, and (D) 10-25% by weight of calcium carbonate, where the percentages by weight of components (A) to (D) together add up to 100%, and with the proviso that components (B), (C) and (D) meet the following conditions: B)+(C)+D)=20 to 60% by weight, weight ratio of (C)/(D) is in the range from 0.3 to 1.5, and where the polyamide moulding material optionally comprises customary additives (E) in addition to components (A) to (D), and where the amount thereof is in addition to the sum of components (A) to (D).