SEMI-CRYSTALLINE COPOLYAMIDES, MOULDING COMPOUNDS COMPRISING SAME AND THEIR USE, AND MOULDINGS MANUFACTURED FROM SAME

Abstract

The present invention relates to semi-crystalline copolyamides and to moulding compounds manufactured from same that contain at least one filler, and optionally additives in addition to the semi-crystalline copolyamide. The invention equally relates to mouldings manufactured from same.

Claims

1-12. (canceled)

13. A semi-crystalline copolyamide formed from the following monomers (a1) to (a5): (a1) 23 to 37.5 mol % 1,6-hexanediamine; (a2) 12.5 to 22 mol % 1,3-bis(aminomethyl)cyclohexane; (a3) 0 to 5 mol % at least one diamine with 2 to 35 carbon atoms, differing from monomers (a1) and (a2); (a4) 45 to 50 mol % 1,6-hexanedioic acid; and (a5) 0 to 5 mol % at least one dicarboxylic acid with 2 to 44 carbon atoms, differing from monomer (a4); wherein the proportions of the monomers (a1), (a2), and (a3) are with respect to the sum of the diamines utilized and add up to 50 mol %; wherein the proportions of the monomers (a4) and (a5) are with respect to the sum of the dicarboxylic acids utilized and add up to 50 mol %; and wherein the monomers (a1) to (a5) add up to 100 mol %.

14. The copolyamide in accordance with claim 13, wherein: the proportion of monomer (a1) in the copolyamide is in the range from 23 to 35 mol-%; and/or the proportion of monomer (a2) in the copolyamide is in the range from 14 to 22 mol %; and/or the proportion of monomer (a3) in the copolyamide is in the range from 0 to 2.5 mol-%; wherein the proportions of the monomers (a1), (a2), and (a3) are with respect to the sum of the diamines used and add up to 50 mol %.

15. The copolyamide in accordance with claim 14, wherein: the proportion of monomer (a1) in the copolyamide is in the range from 25 to 32.5 mol %, and/or the proportion of monomer (a2) in the copolyamide is in the range from 16 to 20 mol %.

16. The copolyamide in accordance with claim 13, wherein: the proportion of monomer (a4) in the copolyamide is in the range from 47.5 to 50 mol %; and/or the proportion of monomer (a5) in the copolyamide is in the range from 0 to 2.5 mol-%, wherein the proportions of monomers (a4) and (a5) are with respect to the sum of the dicarboxylic acids utilized and add up to 50 mol %.

17. The copolyamide in accordance with claim 13, wherein: the at least one diamine (a3) is selected from the group consisting of ethylenediamine, butanediamine, pentanediamine, methylpentanediamine, 1,8-octanediamine, methyloctanediamine, 1,9, nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12 dodecaneamine, trimethyl hexamethylenediamine, 1,4-cyclohexanediamine, 1,3-cyclohexanediamine, bis-4-amino-3-methyl-cyclohexyl)methane, bis-(4-amino-cyclohexyl)methane, isophoronediamine, 1,4-bis(aminomethyl)cyclohexane, m-xylylenediamine, p-xylylenediamine bis(aminocyclohexyl)propane and its alkyl derivatives, and norbornanediamine and bis(aminomethyl)norbornane; and/or the at least one monomer (a5) is selected from the group consisting of isophthalic acid, terephthalic acid, naphthalene dicarboxylic acid, 1,9-nonanedioic acid, 1,10-decanedioic acid, 1,11-undecanedioic acid, 1, 12-dodecanedioic acid, 1,13-tridecanedioic acid, 1,14-tetradecanedioic acid, 1,15-pentadecanoic acid, 1,16-hexadecanedioic acid, 1,17-heptadecanedioic acid, 1,18-octadecanedioic acid, arachidic acid, Japan acid, behenic acid, cyclohexanedioic acid, phenylindanedicarboxylic acid, phenylenediooxydiacetic acid, and dimer fatty acid with 35 or 44 carbon atoms.

18. The copolyamide in accordance with claim 13, wherein the copolyamide has a relative viscosity, measured with 0.5 g in 100 ml m-cresol at 20 C., of 1.45 to 2.10.

19. The copolyamide in accordance with claim 18, wherein the copolyamide has a relative viscosity, measured with 0.5 g in 100 ml m-cresol at 20 C., of 1.50 to 2.05.

20. The copolyamide in accordance with claim 13, wherein the copolyamide has at least one of the following properties: a glass transition temperature in the range from 50 to 200 C., and/or a melting temperature in the range from 180 to 260 C., and/or a crystallization temperature in the range from 130 to 200 C., and/or a crystallization rate in the range from 12 to 50 J/g min.

21. A polyamide moulding compound comprising a copolyamide in accordance claim 13 and a filler.

22. A polyamide moulding material consisting of (i) 22 to 70 wt % of at least one copolyamide in accordance with claim 13; (ii) 30 to 70% by weight of at least one filler; and (iii) 0 to 8 wt % of at least one additive, wherein component (iii) differs from component (ii), and wherein the proportion of components (i) to (iii) add up to 100 wt %.

23. The polyamide moulding material in accordance with claim 22, wherein a moulding manufactured from the polyamide moulding material has at least one of the following properties: a modulus of elasticity determined in accordance with ISO 527 of at least 5000 MPa, and/or a gloss value of 70 to 100 GU determined in accordance with DIN EN 2813 (2015) in the dry state at 60; and/or a gloss value of 60 to 100 GU determined in accordance with DIN EN 2813 (2015) in the conditioned state at 60.

24. A moulding produced from the copolyamide of claim 13.

25. A moulding produced from a polyamide moulding material in accordance with claim 22.

26. The moulding in accordance with claim 25, wherein the moulding is selected from the group consisting of non-lacquered visible parts with or without a function, car passenger compartment or trunk parts, household parts, mechanical engineering parts, parts of electrical devices, parts of electronic devices, parts of domestic appliances, and parts of furniture.

Description

EXAMPLES AND COMPARISON EXAMPLES

[0097] Measurement Methods

[0098] Relative Viscosity

[0099] The relative viscosity was determined in accordance with ISO 307 (2007) at 20 C. 0.5 g polymer pellets were weighed into 100 ml m-cresol for this purpose; the calculation of the relative viscosity (RV) in accordance with RV=t/t0 took place on the basis of section 11 of the standard.

[0100] Glass Transition Temperature (Tg), Crystallization Heat, Melting Heat, and Melting Point

[0101] The determination was made on pellets in accordance with SO 11357-3 (2013).

[0102] Differential scanning calorimetry (DSC) was performed in each of the three heating steps at a heating rate of 20 K/min. Cooling took place at 20 K/min after the first heating. The sample was quenched in dry ice after the second heating. The glass transition temperature (Tg) is determined at the third heating, the melting point at the second. The crystallization temperature and the crystallization rate are determined on the cooling after the first heating. The temperature at the peak maximum is specified as the melting point. The center of the glass transition range, that is here specified as the glass transition temperature (Tg), was determined using the half height method.

[0103] Gloss Value at 60

[0104] The gloss value at a measurement angle of 60 was determined in accordance with DIN EN ISO 2813 (2015) on a Gloss Tector (ATP Messtechnik GmbH, Germany) at 23 C. at plates having the dimensions 60602 mm. The indication is made in gloss units (GU).

[0105] Modulus of Elasticity

[0106] The determination of the modulus of elasticity was carried out in accordance with ISO 527 (2012) at 23 C. at a tensile speed of 1 mm/min at an ISO tensile rod (type A1, mass 17020/104) manufactured in accordance with the standard: ISO/CD 3167 (2003).

[0107] Molar Mass Determination

[0108] The determination of the molar mass is done by means of gel permeation chromatography (GPC) with a triple detector: Refractive index, viscosity, and light scatter (7 and 90).

[0109] The samples are dissolved in hexafluoroisopropanol (HFIP) (approx. 5 mg polymer in 1 ml) for the measurement and are filtered in vials by disposable syringe filters before the filling. [0110] Unit: Malvern OMNISEC GPC-System [0111] Software: Malvern OMNISEC Version 10.41 [0112] Column: Malvern HFIP3000+HFIP6000M 3007.8 mm, 10 m particle size [0113] Eluent: HFIP with 0.1 M potassium trifluoroacetate [0114] Column temperature: 40 C. [0115] Detector temperature: 40 C. [0116] Flow rate 1.0 ml/min

[0117] The molecular masses (number average Mn and weight average Mw) are determined using the triple detection method. The calibration of the GPC system takes place using a monodisperse PMMA standard. Three respective determinations are carried out. The arithmetic mean of the molecular mass is indicated.

[0118] The solvent HFIP was procured in HPLC quality from Fluorochem, Germany, the potassium trifluoroacetate from Sigma-Aldrich, Switzerland.

[0119] The disposable filters can be obtained from Chemie Brunschwig, Switzerland, under the name SFPTFE0250022NBC (PTFE membrane, pore size 0.45 m, filter diameter 25 mm).

[0120] The disposal filters can be obtained from VWR International GmbH, Germany.

[0121] Manufacturing the Test Specimens

[0122] Pellets having a water content of less than 0.1 wt % were used to manufacture the test specimens.

[0123] The test specimens were manufactured on an injection moulding machine of Arburg, model Allrounder 420 C 1000-250. Cylinder temperatures rising and falling from the feed to the nozzle were used in this process.

[0124] ISO Tensile Rods [0125] Cylinder temperatures: 260/265/270/275/280/275 C. [0126] Tool temperature: 110 C. [0127] Plates 60602 mm [0128] Cylinder temperatures: 270/275/280/285/290/285 C. [0129] Tool temperature: 110 C.

[0130] A polished tool was used for the manufacture of the plates.

[0131] The test specimens were used in the dry state if not otherwise specified; for this purpose they were stored for at least 48 h after the injection moulding at room temperature in a dry environment, i.e. over silica gel.

[0132] The 60602 mm plates for the surface gloss measurement in the conditioned state were stored in accordance with ISO 1110 for 7 days at 70 and at 62% relative humidity.

[0133] Starting Materials

[0134] The monomers used in the examples and comparison examples are collected in Table 1 and the components (II) and (III) of the polyamide moulding compounds used are collected in Table 2.

TABLE-US-00001 TABLE 1 Materials used in the examples and in the comparison examples Melting range Monomer CAS No. [ C.] Tradename Manufacturer 1.6-hexanediamine (a1) 124-09-4 39 to 42 BASF SE, Germany 1,3- 2579-20-6 <70 1,3-BAC Mitsubishi Gas bis(aminomethyl)cyclohexane Chemical (a2) Company, Japan bis(4-amino- 6864-37-5 7 to 0.6* Laromin C260 BASF SE, cyclohexyl)methane (a3-1) Germany bis(4-amino- 1761-71-3 16 to 46 4,4- BASF SE, cyclohexyl)methane (a3-2) diaminodicyclo- Germany hexylmethane Isophoronediamine (a3-3) 2855-13-2 10 BASF SE, Germany 1.6 - hexanedioic acid (a4) 124-04-9 151 BASF SE, Germany Isophthalic acid (a5-1) 121-91-5 345 to 348 Flint Hills Resources, Switzerland Terephthalic acid (a5-2) 100-21-0 >400 GMS - Chemie- Handelsges.m.b. H., Germany

TABLE-US-00002 TABLE 2 Components (II) and (III) used in the examples and in the comparison examples Component Description Trade name Manufacturer Glass fiber (II-1) Round glass fiber, 4.5 mm long Vetrotex Saint-Gobain Diameter 10 m 995 EC10-4.5 Vetrotex, France Glass fiber (II-2) Flat glass fiber, 3 mm long, main Nittobo Nitto Boseki Co., cross-sectional axis 28 m, secondary CSG3PA-82.0 Ltd., Japan cross-sectional axis 7 m Kaolin (II-3) CAS No. 1332-58-7 Translink 445 BASF SE, Germany Mica (II-4) CAS No. 12001-26-2 Mica HLM 100 Krntner Montan- industrie, Austria Antioxidant (III-1) Ethylenebis(oxyethylene)bis[3-(5-tert- Irganox 245 BASF SE, Germany butyl-4-hydroxy-m-tolyl)propionate] CAS No.: 36443-68-2 Black masterbatch 25 wt % black carbon in Radipol A45 EMS-CHEMIE AG, (III-2) (PA66) of RadiciChimica SpA, Italy Switzerland Additive mixture Weight ratio (IIIM) (III-1):(III-2) = 1:5

[0135] General Manufacturing Rule for Copolyamides

[0136] The manufacture of the copolyamides in accordance with the invention takes place in a manner known per se in known, stirrable pressure autoclaves having a presentation vessel and a reaction vessel.

[0137] Deionized water is presented in the presentation vessel and the monomers and possible additives are added. Inertization than takes place multiple times with nitrogen gas. Heating takes place to 180 to 230 C. while stirring at the pressure adopted to obtain a homogeneous solution. This solution is pumped through a screen into the reaction vessel and is there heated to the desired reaction temperature of 250 to 300 C. at a pressure of a maximum of 30 bar. The preparation is maintained at the reaction temperature for 2 to 4 hours in the pressure phase. In the subsequent expansion phase, the pressure is reduced to atmospheric pressure within 1 to 2 hours, with the temperature being able to fall a little. In the following degassing phase, the preparation is maintained at a temperature of 250 to 300 C. at atmospheric pressure for 0.5 to 6 hours. The polymer melt is discharged in strand form, cooled at 10 to 80 C. in the water bath, and pelletized. The pellets are dried at 60 to 120 C. under nitrogen or in vacuum to a water content of less than 0.1 wt %.

[0138] Suitable catalysts for accelerating the polycondensation reaction are acids containing phosphorous such as H.sub.3PO.sub.2, H.sub.3PO.sub.3, H.sub.3PO.sub.4, their salts or organic derivatives. The catalysts are preferably admixed in the range from 0.01 to 0.5 wt %, particularly preferably from 0.03 to 0.1 wt %, with respect to the polyamide.

[0139] Suitable anti-foaming agents for avoiding foam formation during the degassing are aqueous, 10% emulsions that contain silicones or silicone derivatives and that are used preferably in quantities from 0.01 to 1.0 wt %, particularly preferably from 0.01 to 0.10 wt %, with respect to the polyamide.

[0140] The setting of the relative viscosity and thus of the molar mass can take place in a manner known per se, e.g. via monofunctional amines or carboxylic acids, and/or difunctional diamines or dicarboxylic acids as chain regulators. Preferred monofunctional chain regulators for the copolyamides in accordance with the invention are benzoic acid, acetic acid, propionic acid, butylic acid, valericanic acid, capric acid, lauric acid, stearic acid, 2-ethylhexanoic acid, cyclohexanoic acid, propylamine, butylamine, pentylamine, hexylamine, 2-ethylhexylamine, n-octylamine, n-nonylamine, n-dodecylamine, n-tetradecylamine, n-hexadidcylamine, stearylamine, cyclohexylamine, 3-(cyclohexylamino)propylamine, methylcyclohexylamine, dimethylcyclohexylamine, benzylamine, 2-phenylethylamine, aniline, or triacetonediamine. The chain regulators can be used individually or in combination. Other monofunctional compounds can also be used as chain regulators which can react with an amino group or with an acid group, such as anhydrides, isocyanates, acid halides, amides, or esters. The typical quantity of use of the monofunctional chain regulators is 10 to 200 mmol per kg copolyamide.

[0141] Manufacture of the Copolyamide in Accordance with Example 2

[0142] The manufacture of the copolyamide PA 66/1,3-BAC6 in accordance with the invention of Example 2 will be explained in the following:

[0143] 1.80 kg of deionized water was presented in a presentation vessel of a 20 l pressure autoclave and 3.68 kg 1,6-hexanedioic acid was stirred in. 1.63 kg 1,3-bis(aminomethyl)cyclohexane, 1.63 kg 1,6-hexanediamine, 1,2 g Antifoam RD 10 wt % emulsion as a defoaming agent and finally 15 g benzoic acid as a chain controller were added. The procedure was then carried out as follows: [0144] Heating up to 210 C. took place after 10 inertization. The homogeneous solution was pumped through a screen into the reaction vessel at 210 C. [0145] The preparation was heated to 290 C. while stirring and was held in the pressure phase at 20 bar for 2 hours. Pressure was relaxed to atmospheric pressure within 1.5 hours and subsequently degassed at 290 C. for one hour. [0146] The polymer melt was discharged, cooled in the water bath (20 C.), and pelletized. The pellets were dried at 100 C. in vacuum (30 mbar) to a water content of less than 0.1 wt %.

[0147] The relative viscosity of the product amounted to 1.74; the glass transition temperature was 72 C. and the melting point 220 C.

[0148] General Manufacturing Rule for the Polyamide Moulding Compounds in Accordance with the Invention

[0149] To manufacture the polyamide moulding compound in accordance with the invention, components (I), (II), and optionally (III) are mixed on conventional compounding machines such as single shaft or twin shaft extruders or screw kneaders. The components are here metered individually or are supplied in the form of a dry blend via gravimetric or volumetric metering trolleys into the feed or respectively into a side feeder.

[0150] If additives (component (III)) are used, they can be introduced directly or in the form of a masterbatch. The carrier material of the masterbatch is preferably a polyamide or a polyolefin. From the polyamides, the copolyamide (I) is particularly suitable for this.

[0151] The dried pellets of the copolyamide, and optionally additives (III), are mixed in a closed container for the dry blend preparation. This mixture is homogenized by means of a wobble mixer, a tumble mixer, or a tumble drier for 10 to 40 minutes. The homogenization can take place under a dried protective gas to avoid moisture absorption.

[0152] The compounding takes place at set cylinder temperatures of 250 to 310 C., with the temperature of the first cylinder being able to be set to below 90 C. Degassing can take place in front of the nozzle. This can take place by means of a vacuum or atmospherically. The melt is discharged in strand form, cooled at 10 to 80 C. in the water bath, and subsequently pelletized. Alternatively, the melt can also be pressed into a water bath through a perforated plate having a cutting device and the cut off pellets can be separated in a post-treatment path (underwater pelletizing). The pellets are dried at 60 to 120 C. under nitrogen or in vacuum to a water content of less than 0.1 wt %.

[0153] Manufacture of the Polyamide Moulding Compound in Accordance with Example 18

[0154] The dried pellets of the copolyamide from Example 2 and the additives (IIIM) were mixed to form a dry blend, and indeed in the ratio indicated in Table 6, Example 18. This mixture was homogenized by means of a tumble mixer for approximately 20 minutes.

[0155] The polyamide moulding compound was manufactured on a twin-shaft extruder of Werner & Pfleiderer type ZSK 25. The dry blend was here metered into the feed via a metering scale. The glass fiber (II-1) were conveyed into the melt by means of a metering scale and a side feeder 6 housing zones before the nozzle.

[0156] The temperature of the first housing was set to 50 C.; that of the remaining housings to 260 to 280 C. A speed of 250 r.p.m. and a throughput of 15 kg/h were used. No degassing took place. The melt strand was cooled in the water bath, cut, and the pellets obtained were dried at 100 C. in a vacuum (30 mbar) for 24 h to a water content of less than 0.1 wt %.

[0157] Experiment Results

[0158] The relative viscosity (RV), the glass transition temperature, the melting point, the crystallization temperature, and the crystallization rate of the copolyamides in accordance with the invention were determined. The corresponding values are shown for Examples 1 to 5 in accordance with the invention in Table 3, for Examples 6 to 12 in accordance with the invention in Table 4, and for Comparison examples 13 to 16 in Table 5.

[0159] All the copolymers manufactured or used in the examples and comparison examples contain Antifoam RD 10 wt % emulsion (silicone emulsion, manufacturer: Dow Corning S.A., Belgium, as a defoaming agent and benzoic acid as a chain regulator.

[0160] The moulding compounds in accordance with the invention of Examples 17 to 32 were examined with respect to the gloss value of the surface and the modulus of elasticity. The results of these examinations are shown in Tables 6 and 7.

[0161] The moulding compounds not in accordance with the invention of Comparison examples 33 to 37 were equally examined with respect to the surface gloss and the modulus of elasticity under the same measurement conditions. The results of the comparison examples are collected in Table 8.

TABLE-US-00003 TABLE 3 Examples 1 to 5 in accordance with the Invention for the copolyamide Examples Component Unit 1 2 3 4 5 1.6-hexanediamine (a1) Mol % 27.5 30.0 32.5 35.0 37.5 1,3-bis(aminomethyl)cyclohexane Mol % 22.5 20.0 17.5 15.0 12.5 (a2) 1.6 - hexanedioic acid (a4) Mol % 50.0 50.0 50.0 50.0 50.0 Measured values Relative viscosity (RV).sup.a 1.75 1.74 1.79 1.81 1.85 Glass transition temperature* C. 74 72 69 68 67 Melting point** C. 214 220 227 230 235 Crystallization temperature*** C. 161 175 180 188 197 Crystallization rate*** J/g min 22 35 39 45 41 *RV relative viscosity measured at a solution of 0.5 g polyamide in 100 ml m-cresol at 20 C. *Values of the 3rd heating **Values of the 2nd heating ***Values on the cooling after the 1st heating

TABLE-US-00004 TABLE 4 Examples 6 to 12 in accordance with the invention for the copolyamide Examples Component Unit 6 7 8 9 10 11 12 1.6-hexanediamine (a1) Mol % 35.0 32.5 35.0 32.5 35.0 35.0 35.0 1,3-bis(aminomethyl)cyclohexane Mol % 10.0 15.0 10.0 15.0 10.0 15.0 15.0 (a2) bis(4-amino-3-methyl- Mol % 5.0 2.5 cyclohexyl)methane (a3-1) bis(4-amino-cyclohexyl)methane Mol % 5.0 2.5 (a3-2) Isophoronediamine (a3-3) Mol % 5.0 Isophthalic acid (a5-1) Mol % 5.0 Terephthalic acid (a5-2) Mol % 5.0 1.6-hexanedioic acid (a4) Mol % 50.0 50.0 50.0 50.0 50.0 45.0 45.0 Measured values Relative viscosity (RV).sup.a 1.79 1.79 1.84 1.83 1.61 1.80 1.83 Glass transition temperature* C. 73 72 71 72 75 78 78 Melting point** C. 228 224 231 224 221 223 225 Crystallization temperature*** C. 182 179 186 181 171 158 163 Crystallization rate*** J/g min 31 33 41 37 18 16 21 *RV relative viscosity measured at a solution of 0.5 g polyamide in 100 ml m-cresol at 20 C. *Values of the 3rd heating **Values of the 2nd heating ***Values on the cooling after the 1st heating

TABLE-US-00005 TABLE 5 Examples 13 to 16 for the copolyamide Comparison examples Component Unit 13 14 15 16 1.6-hexanediamine (a1) Mol % 45.0 40.0 0.0 50.0 1,3-bis(aminomethyl)cyclohexane (a2) Mol % 5.0 10.0 50.0 0.0 Isophthalic acid (a5-1) Mol % Terephthalic acid (a5-2) Mol % 1.6-hexanedioic acid (a4) Mol % 50.0 50.0 50.0 50.0 Measured values Relative viscosity (RV).sup.a 1.84 1.90 1.60 1.79 Glass transition temperature* C. 59 61 110 55 Melting point** C. 250 240 229 261 Crystallization temperature*** C. 216 205 c 229 Crystallization rate*** J/g min 48 37 c 32 *RV relative viscosity measured at a solution of 0.5 g polyamide in 100 ml m-cresol at 20 C. *Values of the 3rd heating **Values of the 2nd heating ***Values on the cooling after the 1st heating c No crystallization on cooling after the 1st heating

TABLE-US-00006 TABLE 6 Examples 17 to 25 in accordance with the invention for the polyamide moulding compound Examples Component Unit 17 18 19 20 21 22 23 24 25 Copolyamide (I) Example 1 Example 2 Example 3 Example 4 Example 5 Example 2 Example 2 Example 2 Example 2 PA 66/1,3- BAC6 from Copolyamide (I) Amount Wt % 47.6 47.6 47.6 47.6 47.6 47.6 49.6 57.6 47.6 Glass fibers (II-1), round Wt % 50.0 50.0 50.0 50.0 50.0 50.0 25.0 Glass fibers (II-2), flat Wt % 50.0 Kaolin (II-3) Wt % 40.0 Mica (II-4) Wt % 25.0 Additive mixture (IIIM) Wt % 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 Antioxidant (III-1) Wt % 0.4 Measured values Gloss value, 60, dry GU 83 88 86 78 81 90 90 93 91 Gloss value, 60, conditioned GU 76 78 75 78 79 84 80 91 90 Modulus of elasticity MPa 16300 16500 16600 16800 16900 16800 16600 6400 16700

TABLE-US-00007 TABLE 7 Examples 26 to 32 in accordance with the invention for the polyamide moulding compound Examples Component Unit 26 27 28 29 30 31 32 Copolyamide (I) Example 6 Example 7 PA 66/1,3- BAC6/MACM6 from Copolyamide (I) Example 8 Example 9 PA 66/1,3- BAC6/PACM6 from Copolyamide (I) Example 10 PA 66/1,3- BAC6/IPD6 from Polyamide (I) Example 11 PA 66/6I//1,3-BAC6/1,3-BACI from Polyamide (1) Example 12 PA 66/6T/1,3-BAC6/1,3-BACT from Copolyamide (I) Amount Wt % 47.6 47.6 47.6 47.6 47.6 47.6 47.6 Glass fibers (II-1), round Wt % 50.0 50.0 50.0 50.0 50.0 50.0 50.0 Additive mixture (IIIM) Wt % 2.4 2.4 2.4 2.4 2.4 2.4 2.4 Measured values Gloss value, 60, dry GU 79 80 78 80 83 77 74 Gloss value, 60, conditioned GU 79 80 75 80 78 74 72 Modulus of elasticity MPa 16400 16500 16600 16600 16500 16600 17000

TABLE-US-00008 TABLE 8 Examples 33 to 37 for the polyamide moulding compound Comparison examples Component Unit 33 34 35 36 37 Copolyamide PA 66/1,3- Comparison Comparison Comparison Comparison BAC6 from example 13 example 14 example 15 example 16 Copolyamide PA 66/1,3- Example 2 BAC6 from Copolyamide Amount Wt % 47.6 47.6 47.6 47.6 97.6 Glass fibers (II-1), round Wt % 50.0 50.0 50.0 50.0 Additive mixture (IIIM) Wt % 2.4 2.4 2.4 2.4 2.4 Measured values Gloss value, 60, dry GU 57 57 65 48 93 Gloss value, 60, GU 49 57 2 43 89 conditioned Modulus of elasticity MPa 16700 17000 15600 16800 2600

[0162] Discussion of the Results

[0163] In the comparison of the copolyamides in accordance with the invention of Examples 1 to 12 with the copolyamides not in accordance with the invention of Comparison examples 13 to 16, the copolyamides in accordance with the invention show the lower melting temperature and crystallization temperature.

[0164] The plates of the polyamide moulding compounds in accordance with the invention of Examples 17 to 23 and 26 to 32 from copolyamides in accordance with the invention filled with glass fibers of Examples 1 to 12 consistently show a better gloss value than the plates of the comparison materials of Comparison examples 33, 34, and 36, and indeed both dry and conditioned.

[0165] Plates from the polyamide moulding compounds of Examples 24 and 25, that are only filled with mineral or with a mixture of glass fibers and mineral, show the best gloss results.

[0166] With the PA 1,3-BAC6 of Comparison example 35 filled with glass fibers, the plates for the examination of the gloss value were only able to be injected at a tool temperature of 80 C. since higher tool temperatures cause pronounced ejection marks and cycle times that are too long. In the dry state, the gloss value admittedly reaches a high value, but this drops by a large amount due to the conditioning since post-crystallization occurs in this process.

[0167] The plates from PA 66 of Comparison example 36 filled with glass fibers show its lack of suitability for visible parts since the surface quality is not sufficient.

[0168] To be able to achieve a modulus of elasticity of at least 5000 MPa, the polyamide moulding compound in accordance with the invention must contain filler such as can be seen from the polyamide moulding compound of Comparison example 37.