Reinforced thermoplastic moulding composition

Abstract

Polyamide moulding composition consisting of the following components(A) 28.0-64.9 wt % of at least one polyamide,(B) 15.0-40.0 wt % of glass fibres,(C) 15.0-35.0 wt % of glass flakes having a particle thickness in the range of 0.3-2.0 pi II,(D) 0.1-2.0 wt % of heat stabilizer,(E) 0-5.0 wt % of additiveswith the proviso that the sum of components (B) and (C) is in the range of 35.0 to 65.0 wt %, based on the sum of components (A) to (E), and the sum of components (A) to (E) makes 100 wt %.

1 . Polyamide moulding composition consisting of the following components
 (A) 38.2-57.8 wt % of at least one polyamide,   (B) 20.0-40.0 wt % of glass fibres,   (C) 16.0-33.0 wt % of glass flakes having a particle thickness in the range of 0.3-2.01 μm,   (D) 0.1-2.0 wt % of heat stabilizer,   (E) 0-5.0 wt % of additives   with the proviso that the sum of components (B) and (C) is in the range of 35.0 to wt %, based on the sum of components (A) to (E),   and the sum of components (A) to (E) makes 100 wt %,   wherein component (A) consists of the following mixture:   (A1) is 50-90 wt % of semicrystalline aliphatic polyamide 66 with a relative viscosity measured on a solution of 0.5 g of polyamide in 100 ml of m-cresol at 20° C. in accordance with ISO 307:2013 in the range of 1.60-2.20; and   (A3) is 10-50 wt % of amorphous semiaromatic polyamide 6I/6T having 55 to mol % of hexamethyleneisophthalamide units and 15 to 45 mol % of hexamethyleneterephthalamide units with a relative viscosity measured on a solution of 0.5 g of polyamide in 100 ml of m-cresol at 20° C. in accordance with ISO 307:2013 in the range of 1.50-1.90,   where the fractions of (A1) and (A3) make up 100 wt % of the polyamide mixture (A), and   wherein a gloss value of a test specimen made from the composition in gloss units measured at 60 degrees is 70% or greater, the gloss value being measured in a dry state after conditioning at 80° C. and 80% relative humidity for 120 h.   
     
     
         2 . Polyamide moulding composition according to  claim 1 , wherein the fraction of component (A) is in the range 41.5-54.7 wt %, based on the sum of components (A) to (E). 
     
     
         3 . Polyamide moulding composition according to  claim 1 , wherein the fraction of component (A) is in the range 44.4-54.4 wt %, based on the sum of components (A) to (E). 
     
     
         4 . Polyamide moulding composition according to  claim 1 , wherein the fraction of component (B) is in the range of 20.0-30.0 wt %, based on the sum of components (A) to (E). 
     
     
         5 . Polyamide moulding composition according to  claim 1 , wherein the glass fibres of component (B) are E-glass fibres or S-glass fibres;
 and/or wherein component (B) is composed of glass fibres having a circular cross section,   or wherein the glass fibres of component (B) are fibres having a non-circular cross section.   
     
     
         6 . Polyamide moulding composition according to  claim 1 , characterized in that the fraction of component (C) is in the range of 18.0-32.0 or 20.0-30.0 wt %, based in each case on the sum of components (A) to (E). 
     
     
         7 . Polyamide moulding composition according to  claim 1 , wherein the mean particle diameter (d50) of component (C) is in the range of 20-300 μm;
 or wherein the particle thickness of component (C) is in the range from 0.4 to 1.7. 
 
     
     
         8 . Polyamide moulding composition according to  claim 1 , wherein the sum of components (B) and (C), based on the sum of components (A)-(E), is in the range of 40.0-60.0 wt %. 
     
     
         9 . Polyamide moulding composition according to  claim 1 , wherein the fraction of component (D) is in the range of 0.2-2.0 wt %, based on the sum of components (A) to (E). 
     
     
         10 . Polyamide moulding composition according to  claim 1 , wherein component (D) comprises organic stabilizers;
 or wherein component (D) is selected from the following group:
 Compounds of mono- or divalent copper; 
 Stabilizers based on secondary aromatic amines; 
 Stabilizers based on sterically hindered phenols; 
 Phosphites and phosphonites; and also 
 Mixtures of the aforesaid stabilizers. 
   
     
     
         11 . Polyamide moulding composition according to  claim 1 , wherein component (E) is present in a fraction, based on the sum of components (A)-(E), in the range of 4.0 wt %. 
     
     
         12 . Polyamide moulding composition according to  claim 1 , wherein component (E) is selected from the following group: crystallization accelerators or retardants, flow aids, lubricants, mould release agents, pigments, dyes, taggants, processing aids, antistatics, carbon black, graphite, carbon nanotubes, residues from polymerization processes including catalysts, salts and derivatives thereof. 
     
     
         13 . Shaped article made of a polyamide moulding composition according to  claim 1  or comprising at least one region or a coating made of the polyamide moulding composition. 
     
     
         14 . Method of using a polyamide moulding composition according to  claim 1  for producing a shaped article, wherein the moulding composition is introduced in melted form and the shaped part is formed in an extrusion process, an injection moulding process or a blow moulding process from this moulding composition. 
     
     
         15 . Polyamide moulding composition according to  claim 1 , wherein component (B) is composed of glass fibres having a circular cross section, having a diameter in the range of 5-20 μm or in the range of 5-13 μm or 6-10 μm,
 or the glass fibres of component (B) are fibres having a non-circular cross section, where the dimensional ratio of the principal cross-sectional axis to the secondary cross-sectional axis perpendicular thereto is greater than 2.5, or in the range of 2.5-6. 
 
     
     
         16 . Polyamide moulding composition according to  claim 1 , wherein the mean particle diameter (d50) of component (C) is in the range of 50-200 μm;
 or wherein the particle thickness of component (C) is in the range from 0.5 to 1.5 μm. 
 
     
     
         17 . Polyamide moulding composition according to  claim 1 , wherein the sum of components (B) and (C), based on the sum of components (A)-(E), is in the range of 42.0 to 57.0 wt %. 
     
     
         18 . Polyamide moulding composition according to  claim 1 , wherein the fraction of component (D) is in the range of 0.2-1.8, based on the sum of components (A) to (E). 
     
     
         19 . Polyamide moulding composition according to  claim 1 , wherein component (D) comprises organic stabilizers free from Cu oxide or Cu salts,
 or wherein component (D) is selected from the following group:
 salts of mono- or divalent copper with inorganic or organic acids or mono- or dihydric phenols, the oxides of mono- or divalent copper, or the complex compounds of copper salts with ammonia, amines, amides, lactams, cyanides or phosphines or mixtures of these compounds; 
 Stabilizers based on secondary aromatic amines; 
 Stabilizers based on sterically hindered phenols; 
 Phosphites and phosphonites; and also 
 Mixtures of the aforesaid stabilizers. 
   
     
     
         20 . Polyamide moulding composition according to  claim 1 , wherein component (D) is selected from the following group:
 Cu(I) or Cu(II) salts of hydrohalic acids, of hydrocyanic acids or the copper salts of aliphatic carboxylic acids, or mixtures of these compounds, where these copper compounds are used as such or in the form of concentrates, where a concentrate refers to a polymer, of the same or substantially the same chemical nature as component (A), which comprises the copper salt in high concentration;   Stabilizers based on secondary aromatic amines;   Stabilizers based on sterically hindered phenols;   Phosphites and phosphonites; and also   Mixtures of the aforesaid stabilizers.   
     
     
         21 . Polyamide moulding composition according to  claim 1 , wherein component (D) is selected from the following group:
 monovalent copper compounds CuCl, CuBr, CuI, CuCN and Cu 2 O, divalent copper compounds CuCl 2 , CuSO4, CuO, copper(II)acetate or copper(II)stearate, or mixtures of these compounds, where these copper compounds are used as such or in the form of concentrates, where a concentrate refers to a polymer of the same or substantially the same chemical nature as component (A), which comprises the copper salt in high concentration, and where the copper compounds are used in combination with further metal halides, including alkali metal halides, including at least one of NaI, KI, NaBr, KBr, where the molar ratio of metal halide to copper is 0.5 to 20;   Stabilizers based on secondary aromatic amines;   Stabilizers based on sterically hindered phenols;   Phosphites and phosphonites; and also   Mixtures of the aforesaid stabilizers.   
     
     
         22 . Polyamide moulding composition according to  claim 1 , wherein component (E) is present in a fraction, based on the sum of components (A)-(E), in the range of 0-3.0 wt %. 
     
     
         23 . Polyamide moulding composition according to  claim 1 , wherein
 (A1) is 50-90 wt % of semicrystalline aliphatic polyamide 66 with a relative viscosity measured on a solution of 0.5 g of polyamide in 100 ml of m-cresol at 20° C. in accordance with ISO 307:2013 in the range of 1.8-2.0; and   (A3) is 10-50 wt % of amorphous semiaromatic polyamide 6I/6T having 67 mol % of hexamethyleneisophthalamide units and 33 mol % of hexamethyleneterephthalamide units with a relative viscosity measured on a solution of 0.5 g of polyamide in 100 ml of m-cresol at 20° C. in accordance with ISO 307:2013 in the range of 1.50-1.60.   
     
     
         24 . Polyamide moulding composition according to  claim 23 , wherein the fraction of component (B) is 25 wt %, based on the sum of components (A) to (E) and wherein component (B) is composed of glass fibres having a non-circular cross section, where the dimensional ratio of the principal cross-sectional axis to the secondary cross-sectional axis perpendicular thereto is 4. 
     
     
         25 . Polyamide moulding composition according to  claim 23 , wherein the fraction of component (B) is 20 or 25 wt %, based on the sum of components (A) to (E) and wherein component (B) is composed of E-glass fibres having a circular cross section, having a diameter in the range of 10 μm. 
     
     
         26 . Polyamide moulding composition according to  claim 24 , wherein the fraction of component (C) is 20 or 25 or 30 wt %, based on the sum of components (A) to (E) and wherein component (E) is composed of glass flakes having a mean particle diameter (d50) of 160 μm and a mean particle thickness 0.7, and wherein the glass flakes have an aminosilane sizing.