Polyamide composition for optical elements

Abstract

The present invention discloses a polyamide composition comprising 30-70 wt % of a polyamide mixture, 30-70 wt % of a filler mixture, and 0-10 wt % of an additive (E), based on the total weight of the polyamide composition. The polyamide composition provides the advantages of good flatness and reduced dust particles while maintaining mechanical properties. These advantages make the polyamide composition particularly suitable for optical component applications.

Description

Field of the Invention

[0001] The present invention relates to a material for camera modules, and more particularly to a polyamide composition for use in camera modules, lens assemblies, lens units, camera module assemblies, and all plastic parts of optical elements.

[0002] Related technical description

[0003] Thermoplastic molding compositions are widely used as structural parts in consumer electronics applications such as housings, frames, and covers due to their design flexibility and cost competitiveness.

[0004] However, for certain special fields with higher and more specialized requirements, such as optical-related components, plastics are generally not easy to balance all the required properties. Camera modules are installed in electronic devices such as mobile phones, laptop computers, digital cameras, digital video cameras, etc. Several parts of the camera module, such as the lens barrel portion (the portion where the lens is placed), the mounting bracket portion (the portion where the lens barrel is mounted and fixed to the substrate), and the module substrate, can be made of plastic materials to reduce cost and weight and implement surface mounting technology ("SMT").

[0005] Over the past decade or so, crystalline polymers such as polyamide (PA) or liquid crystal polymer (LCP) have emerged as the optimal plastic solution for camera modules due to their excellent flow properties for thin-walled, precision molded parts. However, with conventional LCP compositions, particles from the LCP composition can peel off from the lens barrel during threaded movement, as well as from the areas where the mounting bracket and lens barrel abrade against each other, and from the surfaces of both plastic parts. If fragments of the lens barrel or bracket are generated during the manufacture or use of the camera module, they can adhere to the image sensor or lens surface, becoming a major cause of image defects (black scratches or spots).

[0006] EP0856536B1 describes a filler-reinforced LCP having good heat resistance and flowability, which is suitable for camera module applications. However, the filler-reinforced LCP cannot solve the dust particle problem caused by the surface orientation effect of the LCP molecules.

[0007] JP5399136B2 uses milled glass fiber as a filler to address the dust particle problem of PA9T-based solutions, but material dimensional stability, especially warpage control, remains a concern in practical applications.

[0008] To achieve precise image pickup and maintain high image quality during long-term use, the plastic parts of camera modules require excellent dimensional stability, low dust, and warpage control in addition to the basic mechanical structure. However, until now, the two solutions have had their own shortcomings in terms of balancing these properties.

[0009] Summary of the Invention and Advantages

[0010] In view of the above-mentioned prior art, the problem to be solved by the present invention is to provide a polyamide composition comprising 30-70 wt% of a polyamide mixture and 30-70 wt% of a filler mixture, and 0-10 wt% of an additive (E), based on the total weight of the polyamide composition; wherein the polyamide mixture comprises a semi-crystalline semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), and the mass ratio of (A) / (B) is higher than 1:1; and the filler mixture comprises a needle-shaped filler having an average length of equal to or less than 150 μm as component (C) and a plate-shaped filler as component (D), and the mass ratio of (C) / (D) is higher than 1:1.

[0011] The terms "a," "an," and "the" are used interchangeably with the term "at least one." The phrases "at least one" and "comprising at least one" preceding a list refer to any one item in the list and any combination of two or more items in the list. Unless otherwise indicated, all numerical ranges are inclusive of their endpoints and non-integer values between the endpoints.

[0012] The average length and average major diameter of the needle-like fillers, and the equivalent circular diameter and thickness of the plate-like fillers were measured by scanning electron microscopy ("SEM") by directly measuring the size of the fillers in photographs (100-120 counts), and calculated by the arithmetic mean.

[0013] The present invention provides a part for a camera module, a lens assembly, a lens unit, a camera module assembly and an optical element.

[0014] The present invention provides a method for preparing a polyamide composition.

[0015] The present invention provides use of the polyamide composition in camera modules, lens assemblies, lens units, camera module assemblies and optical elements.

[0016] The polyamide composition of the present invention provides the advantages of good flatness and less dust particles while maintaining mechanical properties, which makes the polyamide composition particularly suitable for optical component applications. Detailed Description of the Invention

[0018] Disclosed is a polyamide composition comprising 30-70 wt% of a polyamide mixture and 30-70 wt% of a filler mixture, and 0-10 wt% of an additive (E), based on the total weight of the polyamide composition;

[0019] The polyamide mixture comprises a semi-crystalline semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), and the mass ratio of (A) / (B) is higher than 1:1; the filler mixture comprises a needle-shaped filler having an average length of equal to or less than 150 μm as component (C) and a plate-shaped filler as component (D), and the mass ratio of (C) / (D) is higher than 1:1.

[0020] The term semicrystalline polyamide is understood herein as meaning a polyamide having crystalline domains, as evidenced by the presence of a melting peak having a melting enthalpy of at least 5 J / g. The term semiaromatic polyamide is understood herein as meaning a polyamide derived from monomers comprising at least one monomer containing aromatic groups and at least one aliphatic or cycloaliphatic monomer.

[0021] The semicrystalline semiaromatic polyamide of the present invention comprises repeating units derived from a dicarboxylic acid, a diamine and optionally other monomers such as amino acids and / or lactams, for example derived from a dicarboxylic acid comprising at least one aromatic dicarboxylic acid and a diamine comprising at least one aliphatic diamine, or derived from a dicarboxylic acid comprising at least one aliphatic or cycloaliphatic dicarboxylic acid and a diamine comprising at least one aromatic diamine.

[0022] The amount of the other monomers is preferably 0 to 20 mol %, preferably 0 to 15 mol %, more preferably 0 to 10 mol %, based on the total monomers constituting the semicrystalline semiaromatic polyamide.

[0023] In a preferred embodiment of the present invention, the semicrystalline semiaromatic polyamide comprises repeating units derived from a dicarboxylic acid and a diamine, and 0 to 20 mol % of an amino acid and / or a lactam, based on the total monomers constituting the semicrystalline semiaromatic polyamide;

[0024] wherein the dicarboxylic acid is an aromatic dicarboxylic acid (a-1), or a combination of an aromatic dicarboxylic acid (a-1) and other dicarboxylic acids (a-2) including an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid. The amount of the aromatic dicarboxylic acid (a-1) is preferably 60-100 mol%, and the amount of the other dicarboxylic acid (a-2) is preferably 0-40 mol%, based on the total moles of the dicarboxylic acids constituting the semi-crystalline semiaromatic polyamide;

[0025] The diamine is an aliphatic diamine (b-1), or a combination of an aliphatic diamine (b-1) and an aromatic diamine (b-2). The amount of the aliphatic diamine (b-1) is preferably 80 to 100 mol%, and the amount of the aromatic diamine (b-2) is preferably 0 to 20 mol%, based on the total moles of the diamines constituting the semi-crystalline semiaromatic polyamide.

[0026] In a preferred embodiment of the present invention, the semicrystalline semiaromatic polyamide comprises repeating units derived from dicarboxylic acids and diamines, and 0 to 20 mol % of amino acids and / or lactams, based on the total monomers constituting the semicrystalline semiaromatic polyamide;

[0027] wherein the dicarboxylic acid is an aliphatic dicarboxylic acid, or a combination of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid. The amount of the aliphatic dicarboxylic acid is preferably 80-100 mol%, and the amount of the alicyclic dicarboxylic acid is preferably 0-20 mol%, based on the total moles of the dicarboxylic acids constituting the semi-crystalline semi-aromatic polyamide;

[0028] The diamine is an aromatic diamine or a combination of an aromatic diamine and an aliphatic diamine. The amount of the aromatic diamine is preferably 80-100 mol%, and the amount of the aliphatic diamine is preferably 0-20 mol%, based on the total moles of the diamines constituting the semi-crystalline semi-aromatic polyamide.

[0029] The aromatic dicarboxylic acid in the present invention preferably contains 8 to 20 carbon atoms, more preferably 8 to 14 carbon atoms, such as terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid and / or biphenyl dicarboxylic acid.

[0030] The aliphatic dicarboxylic acids in the present invention preferably contain 4 to 36 carbon atoms, more preferably 6 to 18 carbon atoms, and most preferably 6 to 18 carbon atoms or 36 carbon atoms. Examples of aliphatic dicarboxylic acids are succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanoic acid, hexadecanedioic acid, octadecanedioic acid and / or dimer acids having 36 carbon atoms, more preferably adipic acid, sebacic acid and / or dodecanedioic acid.

[0031] The alicyclic dicarboxylic acid in the present invention preferably contains 4-20 carbon atoms, more preferably 8-20 carbon atoms, more preferably contains a carbon backbone selected from cyclohexane, cyclopentane, cyclohexylmethane, dicyclohexylmethyl, bis(methylcyclohexyl), and most preferably selected from cis- and trans-cyclopentane-1,3-dicarboxylic acid, cis- and trans-cyclopentane-1,4-dicarboxylic acid, cis- and trans-cyclohexane-1,2-dicarboxylic acid, cis- and trans-cyclohexane-1,3-dicarboxylic acid, cis- and trans-cyclohexane-4-dicarboxylic acid.

[0032] The aliphatic diamine in the present invention can be a linear aliphatic diamine or a branched aliphatic diamine, preferably a linear aliphatic diamine. The aliphatic diamine preferably contains 4 to 36 carbon atoms, more preferably 6 to 22 carbon atoms or 36 carbon atoms, most preferably 6 to 12 carbon atoms. Examples of linear aliphatic diamines are 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,16-hexadecanediamine, 1,18-octadecanediamine, 1,20-eicosanediamine and / or 1,22-dodecanediamine; preferably 1,6-hexanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine and / or 1,12-dodecanediamine; more preferably 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine and / or 1,12-dodecanediamine. Examples of branched aliphatic diamines are 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 5-methyl-1,9-nonanediamine, 2,4,4-trimethylhexamethylenediamine, 2,2,4-trimethylhexamethylenediamine and / or 2,4-dimethyloctanediamine; preferably 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,4,4-trimethylhexamethylenediamine and / or 2,2,4-trimethylhexamethylenediamine.

[0033] The aromatic diamine in the present invention is preferably selected from meta-xylenediamine (MXD), para-xylenediamine (PXD), bis(4-aminophenyl)methane, 3-methylbenzidine, 2,2-bis(4-aminophenyl)propane, 1,1-bis(4-aminophenyl)cyclohexane, 1,2-diaminobenzene, 1,3-diaminobenzene, 1,4-diaminobenzene, 1,2-diaminonaphthalene, 1,3-diaminonaphthalene, 1,4-diaminonaphthalene, 2,3-diaminotoluene, N,N'-dimethyl-4,4'-benzylenediamine, bis(4-methylaminophenyl)methane and 2,2'-bis(4-methylaminophenyl)propane, more preferably MXD and / or PXD.

[0034] Examples of semicrystalline semiaromatic polyamides are polyamide MXD6, polyamide PXD6, polyamide MXD9, polyamide PXD9, polyamide MXD10 and / or polyamide PXD10.

[0035] Suitable amino acids in the present invention preferably contain 4 to 12 carbon atoms. Examples of amino acids are 4-aminobutyric acid, 6-aminohexanoic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid and / or 12-aminododecanoic acid.

[0036] Suitable lactams in the present invention preferably contain 4 to 12 carbon atoms, more preferably 6 to 12 carbon atoms. Examples of lactams are 2-pyrrolidone (γ-butyrolactam), 2-piperidone (δ-valerolactam), ε-caprolactam, capryllactam, decanolactam, undecanolactam, enantholactam and / or laurolactam, preferably ε-caprolactam and / or undecanolactam.

[0037] In a preferred embodiment, the semi-crystalline semi-aromatic polyamide comprises repeating units derived from a dicarboxylic acid and a diamine,

[0038] wherein the dicarboxylic acid is an aromatic dicarboxylic acid (a-1), or a combination of an aromatic dicarboxylic acid (a-1) and another dicarboxylic acid (a-2); the aromatic dicarboxylic acid (a-1) is terephthalic acid, naphthalene dicarboxylic acid, biphenyl dicarboxylic acid, or a combination of at least two thereof, preferably terephthalic acid or a combination of terephthalic acid and naphthalene dicarboxylic acid; the other dicarboxylic acid (a-2) is an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid; the amount of the aromatic dicarboxylic acid (a-1) is preferably 60-100 mol%, more preferably 80-100 mol%, further preferably 90-100 mol%, and most preferably 95-100 mol%, based on the total moles of the dicarboxylic acids constituting the semi-crystalline semi-aromatic polyamide; the amount of the other dicarboxylic acid (a-2) is preferably 0-40 mol%, more preferably 0-20 mol%, further preferably 0-10 mol%, and most preferably equal to or less than 5 mol%, based on the total moles of the dicarboxylic acids constituting the semi-crystalline semi-aromatic polyamide;

[0039] The diamine is an aliphatic diamine (b-1), or a combination of an aliphatic diamine and an aromatic diamine (b-2). The amount of the aliphatic diamine (b-1) is preferably 80 to 100 mol%, more preferably 90 to 100 mol%, and most preferably 95 to 100 mol%, based on the total moles of the diamines constituting the semi-crystalline semi-aromatic polyamide; and the amount of the aromatic diamine (b-2) is preferably 0 to 20 mol%, more preferably 0 to 10 mol%, and most preferably 0 to 5 mol%, based on the total moles of the diamines constituting the semi-crystalline semi-aromatic polyamide.

[0040] In a preferred embodiment, the semicrystalline semiaromatic polyamide comprises repeating units derived from at least one aromatic dicarboxylic acid (a-1), and 0 to 10 mol %, more preferably 0 to 5 mol %, of other dicarboxylic acids (a-2) and diamines;

[0041] wherein the aromatic dicarboxylic acid (a-1) comprises 10-40 mol%, more preferably 15-30 mol%, most preferably 20-30 mol% of isophthalic acid and 60-90 mol%, more preferably 70-85 mol%, most preferably 70-80 mol% of at least one aromatic dicarboxylic acid selected from terephthalic acid, naphthalene dicarboxylic acid and biphenyl dicarboxylic acid, preferably terephthalic acid, or a combination of terephthalic acid and naphthalene dicarboxylic acid; and the other dicarboxylic acid (a-2) is an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid;

[0042] The diamine is an aliphatic diamine (b-1), or a combination of an aliphatic diamine and an aromatic diamine (b-2). The amount of the aliphatic diamine (b-1) is preferably 90-100 mol%, more preferably 95-100 mol%; the amount of the aromatic diamine (b-2) is preferably 0-10 mol%, more preferably 0-5 mol%, based on the total moles of the diamine.

[0043] In a more preferred embodiment, the aliphatic dicarboxylic acid of the other dicarboxylic acids (a-2) is preferably adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanoic acid, hexadecanedioic acid and octadecanedioic acid, more preferably adipic acid, sebacic acid and / or dodecanedioic acid.

[0044] In a more preferred embodiment, the aliphatic diamine (b-1) is a linear aliphatic diamine (b-1a), or a combination of a linear aliphatic diamine and a branched aliphatic diamine (b-1b). The linear aliphatic diamine (b-1a) is preferably selected from 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, and 1,12-dodecanediamine. The branched aliphatic diamine (b-1b) is preferably selected from 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,4,4-trimethylhexamethylenediamine, and 2,2,4-trimethylhexamethylenediamine.

[0045] The polyamide in the present invention may include a polyamide copolymer or a blend of two or more polyamides and copolymers thereof.

[0046] The semi-crystalline semi-aromatic polyamide is suitably represented by the symbol,

[0047] -R represents one or more linear aliphatic diamines,

[0048] -B represents one or more branched aliphatic diamines,

[0049] -T represents terephthalic acid,

[0050] -I represents isophthalic acid,

[0051] -A represents one or more aromatic diamines,

[0052] -Y represents one or more aliphatic dicarboxylic acids,

[0053] -V represents one or more lactams.

[0054] Suitable semi-crystalline semi-aromatic polyamides can be represented by PA RT, PA RT / RI, PA RT / BT, PA RT / BT / RI / BI, which include:

[0055] -60-100 mol% of (T), 0-40 mol% of (I); preferably 60-85 mol% of (T), 15-40 mol% of (I); further preferably 65-80 mol% of (T), 20-35 mol% of (I); based on the total moles of (T) + (I); and

[0056] -80-100 mol% of (R), preferably 90-100 mol% of (R); 0-20 mol% of (B), preferably 0-10 mol% of (B); based on the total moles of (R) + (B); R is preferably a linear aliphatic polyamide having 9-36 carbon atoms, more preferably 9-18 carbon atoms. Examples of these polyamides include PA 4T / 4I, PA 4T / 6I, PA 5T / 5I, PA 6T, PA 6T / 6I, PA 6T / 8T, PA 6T / 10T, PA 6T / 10I, PA 9T, PA 10T, PA 12T, PA 10T / 10I, PA 6T / 9T, PA 6T / 12T, PA4T / 6T / DT, PA 4T / 10T / DT, PA 4T / 4I / 6T / 6I / DT / DI, PA6T / 12T / 6I / 12IPA 6T / 10T / 6I, PA 4T / 6T / 4I / 6I, PA 5T / 6T / 5I / 6I, PA 5T / 4T / 5I / 4I, PA 4T / 10T / 5I / 10I, PA 4T / 6T / DT, PA PA4T / 10T / DT or PA4T / 4I / 6T / 6I / DT / DI, preferably PA6T, PA9T, PA10T, PA 6T / 6I, PA 6T / 10T, PA6T / 12T, PA 6T / 10T / 6I, PA 6T / DT and / or PA 6T / DT / 6I / DI. Here, D is 2-methylpentamethylenediamine or 3-methyl-1,5-pentanediamine or a mixture thereof.

[0057] In a preferred embodiment, PA 6T / 6I contains 65-80 mol % of (T), 20-35 mol % of (I), based on the total moles of (T)+(I).

[0058] In a preferred embodiment, PA 6T / 10T comprises 10-60 mol% of (6T), 40-90 mol% of (10T), preferably 10-40 mol% of (6T), 60-90 mol% of (10T), based on the total moles of (T)+(I).

[0059] In a preferred embodiment, PA 6T / 10T / 6I comprises 60-90 mol% of (6T), 5-40 mol% of (6I) and 5-45 mol% of (10T), based on the total moles of (T)+(I).

[0060] Suitable semi-crystalline semi-aromatic polyamides may be represented by PA RT / RY, PA RT / V, PA RT / RI / RY or PA RT / RI / V, which comprise:

[0061] -60-100 mol% of (T), 0-40 mol% of (I); 0-12 mol% of (V), preferably 0-5 mol% of (V); 0-80 mol% of (Y), preferably 0-60 mol% of (Y), more preferably 0-40 mol% of (Y); based on the total moles of (T)+(I)+(V)+(Y); R is preferably a linear aliphatic polyamide having a carbon number of 9-36, more preferably a carbon number of 9-18. Examples of these polyamides include PA 6T / 6, PA 6T / 6I / 6, PA 6T / 66, PA 5T / 510, PA 4T / 410, PA 6T / 610, PA 6T / 612, PA 6T / 1012, PA 9T / 612, PA 9T / 1012, PA 10T / 106, PA 10T / 612, PA 10T / 1012, PA 6T / 6I / 66, PA 6T / 10T / 6, PA 10T / 12, PA 10T / 11 and PA 6T / 6I / 12, preferably PA 6T / 6, PA 6T / 610, PA6T / 10T / 6 and / or PA 6T / 612.

[0062] In a preferred embodiment, PA RT / RY comprises 60-100 mol% of (T), 0-40 mol% of (Y), R is 1,6-hexanediamine, 1,9-nonanediamine, 1,10-decanediamine, and Y is dodecanedioic acid.

[0063] In a preferred embodiment, PA 6T / 10T / 6 comprises 60-85 mol % of (6T), 15-40 mol % of (10T) and 5-15 mol % of caprolactam, based on the total moles of (T)+(I)+caprolactam.

[0064] The melting point (Tm) of the semi-crystalline semi-aromatic polyamide in the present invention is 255-340° C., preferably 285-330° C., and most preferably 305-315° C. The melting point is defined as the temperature corresponding to the endothermic peak in a differential scanning calorimetry (DSC) curve obtained by heating the polyamide at a heating rate of 10° C. / min using DSC.

[0065] The semi-crystalline semi-aromatic polyamide in the present invention preferably has a viscosity number of 60 to 120 ml / g, measured in 96 wt% H2SO4 according to ISO 307-2007.

[0066] In a preferred embodiment, the semi-crystalline semi-aromatic polyamide includes polyamide MXD6, polyamide 12T, polyamide 10T, polyamide 9T, polyamide 6T / 66, polyamide 6T / DT, polyamide 66 / 6T / 61, polyamide 6T / 6, polyamide 6T / 6I copolymer, and the like.

[0067] The term amorphous polyamide is understood herein to mean a polyamide having no or substantially no crystalline domains, as evidenced by the absence of a melting peak or the presence of a melting peak with a melting enthalpy of less than 5 J / g. The melting enthalpy is expressed relative to the weight of the polyamide.

[0068] The amorphous polyamide in the present invention includes amorphous aliphatic polyamide and / or amorphous semiaromatic polyamide.

[0069] In a preferred embodiment, the amorphous aliphatic polyamide comprises a cycloaliphatic diamine and an aliphatic dicarboxylic acid. The alicyclic diamine is preferably selected from bis(3,5-dialkyl-4-aminocyclohexyl)methane, bis(3.5-dialkyl-4-aminocyclohexyl)ethane, bis(3,5-dialkyl-4-aminocyclohexyl)propane, bis(3,5-dialkyl-4-aminocyclohexyl)butane, bis(3-methyl-4-aminocyclohexyl)methane (BMACM or MACM), 4,4'-diaminodicyclohexylmethane (PACM), 2,2-(4,4'-diaminodicyclohexyl)propane (PACP), isophoronediamine (IPD), bis(aminomethyl)cyclohexane (BAC), bis(4-amino-3-ethylcyclohexyl)methane (EACM) and bis(4-amino-3,5-dimethylcyclohexyl)methane (TMACM), more preferably PACM, MACM and / or IPD. Amorphous aliphatic polyamides can be represented by PA CY, where C represents one or more alicyclic dicarboxylic acids. Examples of amorphous aliphatic polyamides are PA MACM6, PA PACM6, PA MACM12, PA PACM10, PA PACM12, and PA IPD6, preferably PA MACM12 and / or PA PACM12.

[0070] In a preferred embodiment, the amorphous semiaromatic polyamide comprises an alicyclic diamine and an aromatic dicarboxylic acid. The alicyclic diamine is preferably selected from PACM, MACM and / or IPD. The aromatic dicarboxylic acid is preferably selected from terephthalic acid and / or isophthalic acid.

[0071] In a preferred embodiment, the amorphous semiaromatic polyamide comprises a diamine and at least 50 mol% of isophthalic acid, preferably 60-100 mol% of isophthalic acid and 0-40 mol% of terephthalic acid, based on the total moles of the dicarboxylic acids. Amorphous semiaromatic polyamides can be represented by PA RI, PA RI / RT, PA BI / BT, PA CT, PA BT, PA CI, or PA BI, wherein the I / T molar ratio is at least greater than 50 / 50, preferably from 80:20 to 60:40. Examples of amorphous semiaromatic polyamides are PA 6I, PA 8I, PA 6I / 6T, PA 10I / 10T, PA PACMI, PA PACMT, PA MACMT, PA MACMI, PA IPDT, PA IPDI, PA DT / DI, PA DT, and PA DI, preferably PA 6I / 6T and PA 12I / 12T.

[0072] In a preferred embodiment, the amorphous semiaromatic polyamide comprises an aromatic diamine and an aliphatic dicarboxylic acid, and optionally contains 0-20 mol% of isophthalic acid. The amorphous semiaromatic polyamide can be represented by PA AY or PA AY / Al. An example of an amorphous semiaromatic polyamide is PA MXD6 / MXDI, wherein the amount of MXD6 is 80-100 mol%, preferably 85-95 mol%, based on the total moles of MXD6 and MXDI.

[0073] The amorphous polyamide in the present invention preferably has a viscosity number of 60 to 150 ml / g, measured in 96 wt% H2SO4 according to ISO 307-2007.

[0074] The amorphous polyamide of the present invention preferably has a solution viscosity η of 1.3-2.0, preferably 1.4-1.8, in particular 1.45-1.75. rel , measured in 0.5 wt.% m-cresol at 20°C.

[0075] The amount of the semi-crystalline semi-aromatic polyamide (A) in the present invention is preferably 30-65 wt%, more preferably 40-60 wt%; the amount of the amorphous polyamide (B) in the present invention is preferably 5-40 wt%, more preferably 10-30 wt%; based on the total weight of the polyamide composition.

[0076] The weight ratio of component (A) / component (B) is higher than 1:1, preferably equal to or higher than 2:1, more preferably from 3:1 to 2:1, and most preferably from 3:1 to 2.5:1.

[0077] The average length of the needle-shaped filler (C) in the present invention is preferably 10-150 μm, more preferably 10-100 μm, and most preferably 10-75 μm. The aspect ratio (length / diameter) of the needle-shaped filler is preferably equal to or greater than 2:1, more preferably 2:1 to 5000:1, further preferably 3:1 to 100:1, and most preferably 4:1 to 30:1, or 4:1 to 18:1. The aspect ratio (length / diameter) is the ratio of the average length to the average major diameter of the cross section. The cross-sectional shape is not limited and may be, for example, elliptical, circular, or rectangular.

[0078] The needle-shaped filler (C) in the present invention is preferably selected from glass fiber, wollastonite, carbon fiber, metal fiber, mineral fiber, potassium titanate, and aluminum borate, and more preferably glass fiber, chopped glass fiber, milled glass fiber, potassium titanate, and / or wollastonite. Preferably, the glass fiber may be E glass fiber, A glass fiber, D glass fiber, AR glass fiber, C glass fiber, or S glass fiber. The cross-section of the glass fiber may be circular or non-circular, preferably circular.

[0079] The needle-shaped filler is preferably surface-treated with a silane coupling agent, such as a vinyl silane coupling agent, an acrylic silane coupling agent, an epoxy silane coupling agent, and an amino silane coupling agent, preferably an amino silane coupling agent. The silane coupling agent may be dispersed in a sizing agent. Examples of sizing agents include acrylic compounds, acrylic / maleic acid derivative modified compounds, epoxy compounds, carbamate compounds, carbamate / maleic acid derivative modified compounds, and carbamate / amine modified compounds.

[0080] The flake filler (D) in the present invention is generally in the form of stacked sheets, flakes, plates, leaves, powders or flakes. The aspect ratio (ECD / T) is generally equal to or greater than 1:1, preferably equal to or greater than 30:1, more preferably equal to or greater than 100:1, and most preferably equal to or greater than 200:1. The aspect ratio (ECD / T) is generally equal to or less than 1000:1, preferably equal to or less than 800:1, more preferably equal to or less than 600:1, and most preferably equal to or less than 500:1. ECD represents the equivalent circular diameter of the flake filler. T represents the maximum thickness of the flake filler. Aspect ratio and equivalent circular diameter can be measured using scanning electron microscope ("SEM") images. The equivalent circular diameter can be defined as the diameter of a circle having the same area as the sheet area of the flake filler.

[0081] In a preferred embodiment of the present invention, the aspect ratio (ECD / T) of the plate-like filler (D) is from 1:1 to 500:1, preferably from 100:1 to 500:1, and most preferably from 200:1 to 400:1.

[0082] In a preferred embodiment of the present invention, the plate-like fillers (D) have an average size in their longest thickness or dimension of 0.001 to 100 μm, preferably 0.001 to 50 μm, most preferably 0.001 to 10 μm or 0.001 to 5 μm.

[0083] In some embodiments, the plate-like filler may have an average equivalent circular diameter of at least about 10 μm, typically 10-900 μm, preferably 20-500 μm, and most preferably 20-300 μm or 30-200 μm.

[0084] In one embodiment of the present invention, the aspect ratio (ECD / T) of the plate-like filler is 1:1 to 300:1, and the average equivalent circular diameter of the plate-like filler is 20-300 μm.

[0085] The plate-like filler (D) in the present invention is preferably selected from talc, mica, silicates, quartz, titanium dioxide, wollastonite, kaolin, magnesium carbonate, magnesium hydroxide, chalk, limestone, feldspar, barium sulfate, solid or hollow glass beads, crushed glass, glass flakes and durable magnetic materials, such as magnetizable metal compounds, and / or alloys or mixtures thereof.

[0086] The amount of the semi-crystalline semi-aromatic polyamide (A) in the present invention is preferably 30-60 wt%, more preferably 30-50 wt%; the amount of the amorphous polyamide (B) in the present invention is preferably 10-30 wt%, more preferably 10-20 wt%, based on the total weight of the polyamide composition.

[0087] The weight ratio of component (C) / component (D) is preferably equal to or higher than 1.5:1, more preferably from 2:1 to 4:1.

[0088] The polyamide composition may also contain various conventional additives (E), as long as the additives and the amounts used do not significantly adversely affect the desired properties of the composition of the present invention. The additives may include lubricants, surface effect additives, antioxidants, colorants, pigments, stabilizers (heat stabilizers, UV stabilizers, radiation stabilizers or hydrolysis stabilizers), flow regulators, plasticizers, release agents, anti-drip agents, UV absorbers, nucleating agents, antistatic agents, elastomer modifiers, release agents and / or antimicrobial agents.

[0089] The lubricant is not particularly limited, and examples include esters, amides, alkali metal salts, alkaline earth metal salts of fatty acids having 10 to 40 carbon atoms (e.g., calcium stearate, zinc stearate, magnesium behenate, magnesium stearate), polyethylene wax, polypropylene wax, ester wax, EVA wax, oxidized polyethylene wax, fatty alcohol, fatty acid, montan wax, pentaerythritol tetrastearate (PETS), and silicone wax. A preferred lubricant is ethylene bisstearamide.

[0090] The lubricant is preferably present in an amount of about 0-3 wt%, more preferably about 0.01-2 wt%, or 0.2-1 wt%, or 0.2-0.8 wt%, based on the total weight of the polyamide composition.

[0091] The antioxidant is not particularly limited, and examples thereof include aromatic amine-based antioxidants, hindered phenol-based antioxidants, phosphite-based antioxidants, metal salts, and iodides.

[0092] Examples of aromatic amine-based antioxidants are poly(1,2-dihydro-2,2,4-trimethylquinoline), bis(4-octylphenyl)amine, 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, N,N'-di-2-naphthyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine, N-phenyl-N'-(3-methacryloyloxy-2-hydroxypropyl)-p-phenylenediamine, N,N'-bis(methylphenyl)-1,4-phenylenediamine, and hydrazine derivatives.

[0093] Examples of hindered phenol-based antioxidants are poly(oxy-1,2-ethanediyl)-α-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]-ω-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropoxy], 2,4-bis[(octylthio)methyl]-o-cresol, octyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, and C7-C9 branched alkyl 3,5-bis(1-dimethylethyl)-4-hydroxyphenylpropanoate. Preferably, the solid hindered phenol-based antioxidant is one or more selected from the "BS" group: 2,4-bis[(dodecanethiol)methyl]-o-cresol, 4,4'-butylenebis-(3-methyl-6-tert-butylphenol), 3,5-bis(1,1-dimethylethyl)-4-hydroxyphenylpropionic acid octadecyl ester, pentaerythritol (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), triethylene glycol bis[3-(3-tert-butyl-5-methyl-4-hydrophenyl)propionate], 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5-triazine, tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanurate, 2,2-thio-diethylenebis[3-(3.5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0094] An example of a phosphite-based antioxidant is tris(2,4-di-tert-butylphenyl)phosphite ( 168, BASF SE, CAS 31570-04-4), bis(2,2-di-tert-butylphenyl)pentaerythritol diphosphite ( 626, Chemtura, CAS 26741-53-7), bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (ADK Stab PEP-36, Adeka, CAS 80693-00-1), bis(2,4-dicumylphenyl)pentaerythritol diphosphite ( S-9228, Dover Chemical Corporation, CAS 154862-43-8), tris(nonylphenyl)phosphite ( TNPP, BASF SE, CAS 26523-78-4), (2,4,6-tri-tert-butylphenol)-2-butyl-2-ethyl-1,3-propanediol phosphite ( 641, Chemtura, CAS 161717-32-4) and P-EPQ.

[0095] Examples of commercially available antioxidants are combinations of copper salts with iodides, such as those available from Brüggemann-Gruppe H3350 or obtained from PolyAd Services Brüggolen PB201.

[0096] The antioxidant is preferably present in an amount of about 0-2 weight percent, more preferably about 0.01-1 weight percent, and most preferably about 0.1-0.8 weight percent, each based on the total weight of the polyamide composition.

[0097] The colorant is not particularly limited, and examples thereof include carbon black, iron oxide, titanium dioxide, ultramarine blue, zinc sulfide, phthalocyanines, quinacridones, perylenes, aniline black, and anthraquinones.

[0098] The colorant is preferably present in an amount of about 0-5 weight percent, more preferably about 0.01-3 weight percent, and most preferably about 0.1-2 weight percent, based on the total weight of the polyamide composition.

[0099] The stabilizer is preferably present in an amount of about 0-2 weight percent, more preferably about 0.01-1 weight percent, and most preferably about 0.01-0.5 weight percent, each based on the total weight of the polyamide composition.

[0100] Examples of suitable nucleating agents are sodium or calcium phenylphosphinate, aluminum oxide (CAS No. 1344-28-1), talc, silicon dioxide, adipic acid and diphenylacetic acid.

[0101] Examples of suitable plasticizers are dioctyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, hydrocarbon oils and N-n-butylbenzenesulfonamide.

[0102] The amount of all additives in the present invention is preferably no more than 10 wt%, more preferably 5 wt% or less, most preferably 2 wt% or less, based on the total weight of the polyamide composition.

[0103] In a preferred embodiment, the polyamide composition comprises:

[0104] As component (A), 30-60 wt% of a semi-crystalline semi-aromatic polyamide; preferably selected from PA9T, PA10T, PA11T, PA12T, PA13T, PA14T PA6T / 8T, PA10T / 6T, PA10T / 610, PA6T / 610, PA5T / 510 and / or PA4T / 410, preferably PA9T, PA10T, PA11T, PA10T / 6T PA10T / 610 and / or PA5T / 510;

[0105] As component (B), 10-30% by weight of an amorphous polyamide; preferably selected from PA6I / 6T and PA12I / 12T;

[0106] As component (C), 20-40% by weight of needle-shaped fillers having an average length of 10-100 μm;

[0107] As component (D), 5 to 20% by weight of a plate-like filler having an average size of 0.001 to 50 μm in its maximum thickness or dimension;

[0108] As component (E), 0-5 wt% of additives;

[0109] All are based on the total weight of the polyamide composition.

[0110] In a preferred embodiment, the polyamide composition comprises:

[0111] As component (A), 30 to 60 wt.% of a semicrystalline semiaromatic polyamide selected from PA9T, PA10T, PA11T, PA12T, PA13T, PA14T PA6T / 8T, PA10T / 6T, PA10T / 610, PA6T / 610, PA5T / 510 and / or PA4T / 410, preferably PA9T, PA10T, PA11T, PA10T / 6T, PA10T / 610 and / or PA5T / 510;

[0112] As component (B), 10-30% by weight of an amorphous polyamide selected from PA6I / 6T, PA12I / 12T;

[0113] As component (C), 20-40% by weight of a needle-shaped filler having an average length of 10-100 μm and an aspect ratio (length / diameter) of 3:1 to 100:1;

[0114] As component (D), 5 to 20% by weight of a plate-like filler having an average size of 0.001 to 50 μm and an average equivalent circle diameter of 20 to 300 μm in terms of its maximum thickness or dimension;

[0115] As component (E), 0-5 wt% of additives;

[0116] All are based on the total weight of the polyamide composition.

[0117] The present invention also discloses a method for preparing the polyamide composition, comprising feeding all components except the needle-shaped filler and the plate-shaped filler into an extruder, feeding the needle-shaped filler and the plate-shaped filler through a downstream feeder, extruding all components, and pelletizing. The extrusion is preferably carried out at a temperature of 320°C, preferably 280-320°C. The polyamide composition is obtained in the form of pellets.

[0118] The present invention also discloses a camera module, a lens assembly, a lens unit, a camera module assembly and optical element parts prepared from the polyamide composition of the present invention.

[0119] The present invention provides use of the polyamide composition in camera modules, lens assemblies, lens units, camera module assemblies and optical elements. Example

[0120] Hereinafter, the present invention will be described in detail with reference to Examples, which, however, should not be construed as limiting the scope of the present invention. In Examples and Comparative Examples, the measurement and evaluation of physical properties are as follows.

[0121] A: PA9T, obtained from Kuraray Co., Ltd. (having a thickness of 79 cm according to ISO 307, 1157, 1628 3 / g viscosity, and a number average molar molecular weight (Mn) of 9600 g / mol).

[0122] B: PA 6I / 6T, HTN301, available from Dupont Co., Ltd (having a viscosity of 1.19 g / cm according to ISO 1183) 3 of intrinsic viscosity).

[0123] C1: Wollastonite CaSiO3, Nyglos 4w, obtained from Imery Co., Ltd, having an average fiber length of 63 μm and an average diameter of 7 μm.

[0124] C2: Glass fibers, HP 3660, obtained from PPG Industries Inc., having an average diameter of 10 μm and an average length of 4.5 mm.

[0125] D1: Glass sheet, MEG160FYX (6145), available from Nippon Sheet Glass Co., Ltd., having an average equivalent circle diameter of 160 μm and a thickness of 0.7 μm.

[0126] D2: Mica KMg3(Si3Al)O 10 (FOH) 2,325-HK, obtained from Imery Co., Ltd., with an average particle size of 30 μm.

[0127] E1: antioxidants AO1098, BNX 1098, obtained from Mayzo Inc.

[0128] E2: Lubricant, N,N'-ethylenebisstearamide, obtained from Croda Trading (Shanghai) Co., Ltd.

[0129] E3: carbon black, obtained from Orion Engineered Carbons.

[0130] Examples 1-2 (E1, E2) and Comparative Examples 1-7 (C1-C7)

[0131] The formulations of the Examples and Comparative Examples are shown in Table 1 below. The raw materials, excluding the filler, were mixed in a Turbula T50A high-speed mixer and fed into a Coperion ZSK26MC twin-screw extruder. The filler was fed at a downstream side feeder to maintain a good shape and aspect ratio. The extruded products were melt-extruded at 320° C. and pelletized to obtain polyamide compositions in pellet form.

[0132] The dried granules were processed in an injection molding machine KM130CX from Krauss Maffei with a clamping force of 130 tons at a melt temperature of 300-330° C. to give test specimens.

[0133] The tensile strength at break, the tensile modulus at break, and the tensile elongation at break of samples having a thickness of 4 mm were measured according to ISO 527-1-2012. Type 1 test specimens as described in ISO 527-1-2012 were used.

[0134] HDT was tested according to ISO 75-2-2013, Method A at 0.45 MPa.

[0135] Charpy notched impact strength and Charpy unnotched impact strength were tested using edge impact according to ISO 179-1-2010. Specimens for the unnotched Charpy test were Type 1 specimens with dimensions of 80 x 10 x 4 mm (length x width x thickness). Specimens for the notched Charpy test were Type 1 specimens with notch type A. All specimens were conditioned at 23°C and 50% relative humidity for 16 hours. Testing was performed in the same atmosphere as the conditioning.

[0136] Flow length is measured using a spiral flow tool with a spiral flow channel. The cross-section of the spiral flow channel is 2 mm thick and 5.5 mm wide, with numbers and subdivisions of centimeters marked along the flow channel. The test material is melted at 320°C and then injected into the spiral flow channel at a pressure of 500 bar and 140°C. The spiral flow channel is filled from the gate in the center of the spiral flow channel. The pressure and temperature are maintained until the melt stops. The number marking at the tip of the spiral melt gives the flow length.

[0137] The flatness (warpage) properties of the materials were evaluated by visually inspecting discs (diameter = 82 mm, thickness = 0.75 mm) molded under the same conditions and rating them with two grades: good and poor.

[0138] The material's dust particles were measured using a Rion KS-42D liquid particle counter. The detailed method is as follows: First, a molded plastic part (0.75mm thick, 82mm diameter disc) was rinsed with detergent and deionized water and dried with nitrogen. Next, the part was immersed in 500ml of deionized water and cleaned for 5 minutes using a 200W ultrasonic cleaner. The deionized water was then immediately pumped into the particle counter to count the dust particle concentration. The particle detection range was set to 10-100µm.

[0139] Table 1

[0140]

[0141] * “Good” means no noticeable warping, and “Poor” means severe warping or slight warping.

[0142] As can be seen from Table 1, the embodiments of the present invention maintain good flowability, tensile properties, and impact properties, and have excellent effects on reducing dust particles and warpage, which is particularly suitable for camera modules, optical elements, etc.

Claims

1. A polyamide composition comprising 58.7-70 wt. % of a polyamide mixture and 30-40 wt. % of a filler mixture, based on the total weight of the polyamide composition; wherein the polyamide mixture comprises a semi-crystalline semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), and the mass ratio of (A) / (B) is 3:1 to 2:1; and the filler mixture comprises a needle-like filler having an average length of equal to or less than 150 μm as component (C) and a plate-like filler as component (D), and the mass ratio of (C) / (D) is 2:1 to 4:1; The semi-crystalline semi-aromatic polyamide is PA 4T / 4I, PA 4T / 6I, PA 5T / 5I, PA 6T, PA 6T / 8T, PA 6T / 10T, PA 6T / 10I, PA 9T, PA 10T, PA 12T, PA 10T / 10I, PA 6T / 9T, PA 6T / 12T, PA 4T / 6T / DT, PA 4T / 10T / DT, PA 4T / 4I / 6T / 6I / DT / DI, PA6T / 12T / 6I / 12I, PA 6T / 10T / 6I, PA 4T / 6T / 4I / 6I, PA 5T / 6T / 5I / 6I, PA 5T / 4T / 5I / 4I, PA 4T / 10T / 5I / 10I, PA 4T / 6T / DT, PA 4T / 10T / DT or PA4T / 4I / 6T / 6I / DT / DI, wherein D is 2-methylpentamethylenediamine or 3-methyl-1,5-pentanediamine or a mixture thereof; The amorphous polyamide is selected from PA MACM6, PA PACM6, PA PACM10 and PA IPD6, PA 6I, PA8I, PA6I / 6T, PA 10I / 10T, PA PACMI, PA PACMT, PA MACMT, PA MACMI, PA IPDT, PA IPDI, PA DT / DI, PA DT and PA DI, and PA MXD6 / MXDI; The aspect ratio of the length to diameter of the needle-shaped filler (C) is equal to or higher than 2:1; and The aspect ratio of ECD / T of the flake filler (D) is equal to or greater than 1:1, and the aspect ratio of ECD / T of the flake filler (D) is equal to or less than 1000:1; ECD represents the equivalent circular diameter of the flake filler; and T represents the maximum thickness of the flake filler.

2. The polyamide composition according to claim 1, wherein the amount of the semi-crystalline semi-aromatic polyamide (A) is 30-65 wt%; and the amount of the amorphous polyamide (B) is 5-40 wt%; based on the total weight of the polyamide composition.

3. The polyamide composition according to claim 2, wherein the amount of the semi-crystalline semi-aromatic polyamide (A) is 40-60 wt%; based on the total weight of the polyamide composition.

4. The polyamide composition according to claim 2, wherein the amount of amorphous polyamide (B) is 10-30 wt%; based on the total weight of the polyamide composition. The polyamide composition according to claim 1 , wherein the weight ratio of component (A) / component (B) is 3:1 to 2.5:

1. The polyamide composition according to claim 2 , wherein the weight ratio of component (A) / component (B) is 3:1 to 2.5:

1.

7. The polyamide composition according to any one of claims 1 to 6, wherein the aspect ratio of the length to the diameter of the needle-shaped filler (C) is from 2:1 to 5000:

1.

8. The polyamide composition according to claim 7, wherein the aspect ratio of the length to the diameter of the needle-shaped filler (C) is from 3:1 to 100:

1.

9. The polyamide composition according to any one of claims 1 to 6, wherein the average length of the needle-like filler (C) is 10 to 150 μm.

10. The polyamide composition according to claim 9, wherein the average length of the needle-like filler (C) is 10 to 100 μm.

11. The polyamide composition according to any one of claims 1 to 6, wherein the aspect ratio ECD / T of the platy filler (D) is equal to or greater than 30:

1.

12. The polyamide composition according to any one of claims 1 to 6, wherein the aspect ratio ECD / T of the platy filler (D) is equal to or less than 800:

1.

13. The polyamide composition according to any one of claims 1 to 6, wherein the plate-like filler (D) has an average size of 0.001 to 100 μm in terms of its maximum thickness or dimension.

14. The polyamide composition according to claim 9, wherein the plate-like filler (D) has an average size of 0.001 to 100 μm in terms of its maximum thickness or dimension.

15. The polyamide composition according to claim 13, wherein the plate-like filler (D) has an average size of 0.01 to 50 μm in terms of its maximum thickness or dimension.

16. The polyamide composition according to any one of claims 1 to 6, wherein the average equivalent circle diameter of the plate-like filler is at least 10 μm.

17. The polyamide composition according to claim 14, wherein the plate-like filler has an average equivalent circle diameter of at least 10 μm.

18. The polyamide composition according to claim 16, wherein the average equivalent circle diameter of the plate-like filler is 10-900 μm.

19. The polyamide composition according to claim 16, wherein the average equivalent circle diameter of the plate-like filler is 20-500 μm.

20. A method for preparing a polyamide composition according to any one of claims 1 to 19, comprising feeding all components except needle-like fillers and plate-like fillers into an extruder, feeding the needle-like fillers and plate-like fillers through a downstream feeder, extruding all components and pelletizing.

21. A part for an optical element, prepared from the polyamide composition according to any one of claims 1 to 19.

22. A part for a camera module, prepared from the polyamide composition according to any one of claims 1 to 19.

23. A part for a lens assembly, prepared from the polyamide composition according to any one of claims 1 to 19.

24. A part for a lens unit, prepared from the polyamide composition according to any one of claims 1 to 19.

25. A part for a camera module assembly, prepared from the polyamide composition according to any one of claims 1 to 19.

26. Use of the polyamide composition according to any one of claims 1 to 19 in an optical element.

27. Use of the polyamide composition according to any one of claims 1 to 19 in a camera module.

28. Use of the polyamide composition according to any one of claims 1 to 19 in a lens assembly.

29. Use of the polyamide composition according to any one of claims 1 to 19 in a lens unit.

30. Use of the polyamide composition according to any one of claims 1 to 19 in a camera module assembly.

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