Polyamide moulding composition and use thereof

Abstract

A thermoplastic moulding composition, in particular a polyamide moulding composition, consisting of, by weight: (A) 20-88%—thermoplastic material; (B) 10-60%—fibrous fillers, formed from (B1) 10-60%—glass fibres, selected from: glass fibres (B1_1) with a non-circular cross section, wherein the axis ratio of the main cross-sectional axis to the secondary cross-sectional axis is at least 2; high-strength glass fibres (B1_2) with a glass composition (substantially SiO2, AlO, and MgO; or mixtures thereof; (B2) 0-20%—glass fibres, different from glass fibres of component (B1) and have a circular cross section; and (B3) 0-20%—further fibrous fillers, different from fibres of (B1) and (B2), not based on glass, and selected from the group: carbon fibres, graphite fibres, aramid fibres, nanotubes; (C) 2-10%—LDS additive or a mixture of LDS additives; (D) 0-30%—particulate filler; (E) 0-2%—further, different additives; the sum of (A)-(E) is 100% by weight.

1 . A thermoplastic moulding composition consisting of:
 (A) 20-88% by weight of a thermoplastic material consisting of polyamide (A1) or a mixture of polyamides, with the proviso that up to 40% thereof can be replaced by a thermoplastic material (A2) not based on polyamide;   (B) 10-60% by weight of fibrous fillers, formed from
 (B1) 10-60% by weight of glass fibres, selected from the group consisting of: 
 glass fibres (B1 — 1) with a non-circular cross section, wherein the axis ratio of the main cross-sectional axis to the secondary cross-sectional axis is at least 2; 
 high-strength glass fibres (B1 — 2) with a glass composition, which are formed substantially from the components silicon dioxide, aluminium oxide and magnesium oxide; 
 or mixtures of such glass fibres (B1 — 1, B1 — 2); 
 (B2) 0-20% by weight of glass fibres, which are different from the glass fibres of component (B1) and have a circular cross section; 
 (B3) 0-20% by weight of further fibrous fillers, which are different from the fibres of components (B1) and (B2), are not based on glass, and are selected from the group: carbon fibres, graphite fibres, aramid fibres, nanotubes; 
   (C) 2-10% by weight of laser direct structuring additive or a mixture of laser direct structuring additives;   (D) 0-30% by weight of particulate filler;   (E) 0-2% by weight of further, different additives;   
       wherein the sum of (A)-(E) makes up 100% by weight. 
     
     
         2 . (canceled) 
     
     
         3 . The moulding composition according to  claim 1 , wherein the proportion of component (A) lies in the range of 25-82% by weight. 
     
     
         4 . The moulding composition according to  claim 1 , wherein the proportion of component (B1) lies the range of 30-65% by weight. 
     
     
         5 . The moulding composition as claimed in  claim 1 , wherein the glass fibres of component (B1 — 1) are selected as E-glass fibres in accordance with ASTM D578-00 with a non-circular cross section, and/or the high-strength glass fibres of component (B1 — 2) are selected as high-strength glass fibres based on the ternary system silicon dioxide/aluminium oxide/magnesium oxide or on the quaternary system silicon dioxide/aluminium oxide/magnesium oxide/calcium oxide. 
     
     
         6 . The moulding composition according to  claim 1 , wherein the high-strength glass fibre (B1 — 2) has a substantially circular cross section. 
     
     
         7 . The moulding composition according to  claim 1 , wherein the proportion of component (C) lies in the range of 3-8% by weight. 
     
     
         8 . The moulding composition according to  claim 1 , wherein the component (C) is an laser direct structuring additive with an absorption coefficient, different from zero, for ultraviolet, visible or infrared radiation, which forms metal nuclei under the action of electromagnetic radiation, and facilitates and/or enables and/or improves the chemical metallising deposition of conductor tracks at the irradiated points. 
     
     
         9 . The moulding composition according to  claim 8 , wherein the component (C) is an laser direct structuring additive with an average particle size (D50) in the range of 50-10,000 nanometres, and/or has an aspect ratio of at most 10. 
     
     
         10 . The moulding composition according to  claim 1 , wherein the component (C) is an laser direct structuring additive selected from the group of metal oxides, known as spinels, having the general chemical formula
   AB 2 O 4     wherein A stands for a metal cation with the valency 2;   B stands for a metal cation of valency 3.   
     
     
         11 . The moulding composition according to  claim 1 , wherein the proportion of component (D) lies in the range of 0-20% by weight. 
     
     
         12 . The moulding composition according to  claim 1 , wherein the particulate filler has particles of a mean particle size (D50) in the range of 0.1-40 μm, and/or has an aspect ratio of at most 10. 
     
     
         13 . The moulding composition according to  claim 1 , wherein the component (A) is polyamide (A1) or a mixture of polyamides, with the proviso that up to 40% thereof can be replaced by a thermoplastic material (A2) not based on polyamide, and wherein this thermoplastic material (A2) not based on polyamide is selected from the group consisting of: polycarbonate, polystyrene, polymethyl methacrylate, acrylonitrile butadiene styrene copolymer, acrylonitrile styrene copolymer, polyolefin, polyoxymethylene, polyester, polysulfone, polyphenylene ether, polyphenylene sulphide, polyphenylene oxide, liquid-crystalline polymers, polyether ketone, polyether ether ketone, polyimide, polyester imide, polyurethane, polysiloxane, polyacrylate, polymethacrylate, and mixtures or copolymers based on such systems,
 and/or in that the proportion of component (A2) lies in the range of 0-20% by weight;   and/or in that the proportion of component (B2) lies in the range of 0-10% by weight.   
     
     
         14 . The moulding composition according to  claim 1 , wherein the glass fibres of component (B1) and/or (B2) and/or (B3) are present in the form of short fibres, or in the form of endless fibres. 
     
     
         15 . A component based on a moulding composition according to  claim 1 . 
     
     
         16 . The moulding composition according to  claim 1 , wherein the component (A) consists of polyamide (A1) or a mixture of polyamides, with the proviso that up to 5% thereof can be replaced by a thermoplastic material (A2) not based on polyamide. 
     
     
         17 . The moulding composition according to  claim 1 , wherein the component (A) consists of polyamide (A1) or a mixture of polyamides. 
     
     
         18 . The moulding composition according to  claim 1 , wherein total proportion of (A) in the form of polyamide (A1) is in the range of 25-82% by weight. 
     
     
         19 . The moulding composition according to  claim 1 , wherein total proportion of (A) in the form of polyamide (A1) is in the range of 30-77% by weight. 
     
     
         20 . The moulding composition according to  claim 1 , wherein the proportion of component (B1) lies in the range of 35-60% by weight. 
     
     
         21 . The moulding composition according to  claim 1 , wherein the proportion of component (B1) lies the range of 30-65% by weight and wherein the proportions of (B2) and/or (B3) are further preferably zero. 
     
     
         22 . The moulding composition according to  claim 1 , wherein the glass fibres of component (B1 — 1) are selected as E-glass fibres in accordance with ASTM D578-00 with a non-circular cross section, consisting of 52-62% of silicon dioxide, 12-16% of aluminium oxide, 16-25% of calcium oxide, 0-10% of borax, 0-5% of magnesium oxide, 0-2% of alkali oxides, 0-1.5% of titanium dioxide and 0-0.3% of iron oxide,
 and/or the high-strength glass fibres of component (B1 — 2) are selected as high-strength glass fibres based on the ternary system silicon dioxide/aluminium oxide/magnesium oxide or on the quaternary system silicon dioxide/aluminium oxide/magnesium oxide/calcium oxide, wherein they have the following composition: 58-70% by weight of silicon dioxide (SiO 2 ), 15-30% by weight of aluminium oxide (Al 2 O 3 ), 5-15% by weight of magnesium oxide (MgO), 0-10% by weight of calcium oxide (CaO) and 0-2% by weight of further oxides.   
     
     
         23 . The moulding composition as claimed in  claim 1 , wherein the high-strength glass fibres of component (B1 — 2) are selected as high-strength glass fibres based on the ternary system silicon dioxide/aluminium oxide/magnesium oxide or on the quaternary system silicon dioxide/aluminium oxide/magnesium oxide/calcium oxide, wherein they have the following composition: 60-67% by weight of silicon dioxide (SiO 2 ), 20-28% by weight of aluminium oxide (Al 2 O 3 ), 7-12% by weight of magnesium oxide (MgO), 0-9% by weight of calcium oxide (CaO) and 0-1.5% by weight of further oxides. 
     
     
         24 . The moulding composition according to  claim 1 , wherein the proportion of component (C) lies in the range of 3-6% by weight. 
     
     
         25 . The moulding composition according to  claim 1 , wherein the component (C) is an laser direct structuring additive with an absorption coefficient, different from zero, for ultraviolet, visible or infrared radiation, which forms metal nuclei under the action of electromagnetic radiation, in the form of laser radiation, and facilitates and/or enables and/or improves the chemical metallising deposition of conductor tracks at the irradiated points, wherein the laser direct structuring additive has an absorption capability in the visible and infrared radiation range with an absorption coefficient of at least 0.2, and/or wherein an absorber is provided, which transfers the radiation energy to the laser direct structuring additive. 
     
     
         26 . The moulding composition according to  claim 8 , wherein the component (C) is an laser direct structuring additive with an average particle size (D50) in the range of 300 to 4,000 nanometres, and/or has an aspect ratio of at most 5. 
     
     
         27 . The moulding composition according to  claim 1 , wherein the component (C) is an laser direct structuring additive selected from the group of metal oxides, what are known as spinels having the general chemical formula
   AB 2 O 4     wherein A stands for a metal cation with the valency 2, wherein A is selected from the group consisting of: magnesium, copper, cobalt, zinc, iron, manganese, tin and nickel, and also combinations thereof;   B stands for a metal cation of valency 3, wherein B is selected from the group consisting of: manganese, nickel, copper, cobalt, tin, titanium, iron, aluminium and chromium, and also combinations thereof.   
     
     
         28 . The moulding composition according to  claim 1 , wherein the component (C) is an laser direct structuring additive is a copper iron spinel, a cupriferous magnesium aluminium oxide, a copper chromium manganese mixed oxide, a copper manganese iron mixed oxide, optionally in each case with oxygen defects, or copper salts and oxides, namely copper(I) oxide, copper(II) oxide, alkaline copper phosphates, copper sulphate, and also metal complex compounds, or chelate compounds of copper, tin, nickel, cobalt, silver and palladium, or mixtures of such systems,
 and/or is selected from the following group: copper chromium manganese mixed oxides, copper manganese iron mixed oxides, copper chromium oxide, zinc iron oxide, cobalt chromium oxide, cobalt aluminium oxide, magnesium aluminium oxide, and mixtures and/or surface-treated forms thereof and/or forms thereof having oxygen defects.   
     
     
         29 . The moulding composition according to  claim 1 , wherein the proportion of component (D) lies in the range of 3-10% by weight. 
     
     
         30 . The moulding composition according to  claim 1 , wherein the particulate filler has particles of a mean particle size (D50) in the range of 0.3-10 μm, and/or has an aspect ratio of at most 5, or is formed substantially by such particles. 
     
     
         31 . The moulding composition according to  claim 1 , wherein the proportion of component (A2) is in the range 0-5% by weight, or wherein component (A1) is provided exclusively;
 and/or in that the proportion of component (B2), selected from the group consisting E-glass fibres, A-glass fibres, C-glass fibres, D-glass fibres, basalt fibres and mixtures thereof, in each case with a circular or a non-circular cross-sectional area, lies in the range of 0-5% by weight, or wherein component (B1) is provided exclusively.   
     
     
         32 . The moulding composition according to  claim 1 , wherein the glass fibres of component (B1) and/or (B2) and/or (B3) are present in the form of short fibres, in the form of cut glass with a length in the range of 0.2-20 mm. 
     
     
         33 . A component having electrical conductor tracks, based on a moulding composition according to  claim 1 . 
     
     
         34 . A component having electrical conductor tracks, based on a moulding composition according to  claim 1 , as a casing or casing part for portable electronic devices, as PDAs, mobile telephones, telecommunications devices, casings or casing parts for personal computers, notebooks, medical devices, in hearing aids, sensor technology, or RFID transponders or parts for the automotive field, as air bag modules and multi-function steering wheels.