Polyamide compositions for optical elements

Abstract

The present invention discloses a polyamide composition comprising 30% to 70% by weight of a polyamide mixture, 30% to 70% by weight of a filler mixture, and 0 to 10% by weight of an additive (E), based on the total weight of the polyamide composition. The polyamide composition offers the advantages of good flatness and low dust particles while maintaining mechanical properties. Due to these advantages, the polyamide composition is particularly suitable for use in optical elements.

Description

[Technical Field]

[0001] The present invention relates to materials for camera modules, more specifically to polyamide compositions used in camera modules, lens assemblies, lens units, camera module assemblies, and all plastic parts of optical elements. [Background technology]

[0002] Thermoplastic molding compositions are widely used as structural components, such as housings, frames and covers, in consumer electronics applications due to their design flexibility and cost competitiveness.

[0003] However, in specialized fields with more advanced and specialized requirements, such as optical components, it is usually not easy for plastics to balance all the required properties. Camera modules are installed in electronic devices such as mobile phones, laptops, digital cameras, digital video cameras, etc. Some parts of a camera module, such as the lens barrel (the part where the lens is located), the mount holder (the part in which the lens barrel is attached and fixed to the board), and the module board, can be manufactured from plastic materials to reduce cost and mass and realize surface mount technology ("SMT").

[0004] Over the past decade, crystalline polymers such as polyamide (PA) or liquid crystal polymer (LCP) have gradually emerged as the best plastic solution for this camera module due to their excellent flowability for thin-wall precision molding. However, with conventional liquid crystal polymer compositions, particles composed of LCP compositions can peel off from the lens barrel (the part where both the mount holder and the lens barrel wear against each other) and the surface (both plastic parts) when the lens barrel moves in a threaded manner. If fragments of the barrel or holder are generated during the manufacturing or use of the camera module, the fragments can adhere to the image sensor surface or lens surface, which is one of the major causes of image defects (black scratches or spots).

[0005] EP0856536B1 describes a filler-reinforced LCP with good heat resistance and flowability for this camera module application, but does not solve the problem of dust particles caused by the planar alignment effect of the LCP molecules.

[0006] Although JP5399136B2 uses ground glass fiber as a filler to solve the dust particle problem of PA9T-based solutions, material dimensional stability, especially warpage control, is still a concern in practical use. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] EP0856536B1 [Patent Document 2] JP5399136B2 Summary of the Invention [Problem to be solved by the invention]

[0008] To achieve accurate imaging and maintain high image quality during long-term use, the plastic parts of a camera module must have excellent dimensional stability, low dust, and warpage control, apart from the basic mechanics. However, to date, both solutions still have their own drawbacks in terms of the balance of the above properties. [Means for solving the problem]

[0009] Summary and Advantages of the Invention 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 to 70% by mass of a polyamide mixture, 30 to 70% by mass of a filler mixture, and 0 to 10% by mass of an additive (E), where these mass percentages are based on the total mass of the polyamide composition. The polyamide mixture comprises a semi-crystalline, semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), with a mass ratio (A) / (B) greater than 1:1. The filler mixture comprises a needle-like filler having an average length of 150 μm or less as component (C) and a plate-like filler as component (D), with a mass ratio (C) / (D) greater than 1:1.

[0010] The terms "a," "an," and "the" are used interchangeably with the term "at least one." The phrases "at least one of" and "comprising at least one of," when followed by a list, refer to any one of the items in the list, and any combination of two or more of the items in the list. All numerical ranges include their endpoints, and all non-integer values ​​between the endpoints, unless otherwise specified.

[0011] The average length and average outer diameter of needle-like fillers, and the circle-equivalent diameter and thickness of plate-like fillers are measured by directly measuring the size of the fillers in the graph (100 to 120 counts) using a scanning electron microscope ("SEM"), and calculated by arithmetic average.

[0012] The present invention provides camera modules, lens assemblies, lens units, camera module assemblies and components for optical elements.

[0013] The present invention provides a method for preparing a polyamide composition.

[0014] The present invention provides methods of using polyamide compositions in camera modules, lens assemblies, lens units, camera module assemblies and optical elements.

[0015] The polyamide compositions of the present invention offer the advantages of good flatness and fewer dust particles while maintaining mechanical properties, which make them particularly suitable for optical element applications. DETAILED DESCRIPTION OF THE INVENTION

[0016] Disclosed is a polyamide composition comprising 30 to 70% by weight of a polyamide blend, 30 to 70% by weight of a filler blend, and 0 to 10% by weight of an additive (E), where the weight percentages are based on the total weight of the polyamide composition. The polyamide blend comprises a semi-crystalline, semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), with a weight ratio (A) / (B) greater than 1:1. The filler blend comprises a needle-like filler having an average length of 150 μm or less as component (C) and a plate-like filler as component (D), with a weight ratio (C) / (D) greater than 1:1.

[0017] By the term semi-crystalline polyamide, we mean a polyamide having crystalline domains, as indicated by the presence of a melting peak with a melting enthalpy of at least 5 J / g.By the term semi-aromatic polyamide, we mean a polyamide derived from monomers comprising at least one monomer containing an aromatic group and at least one aliphatic or cycloaliphatic monomer.

[0018] The semi-crystalline, semi-aromatic polyamides according to the present invention comprise repeating units derived from dicarboxylic acids, diamines, and optionally other monomers such as amino acids and / or lactams, for example from dicarboxylic acids comprising at least one aromatic dicarboxylic acid and diamines comprising at least one aliphatic diamine, or from dicarboxylic acids comprising at least one aliphatic or cycloaliphatic dicarboxylic acid and diamines comprising at least one aromatic diamine.

[0019] The other monomers are preferably present in an amount of 0 to 20 mol %, preferably 0 to 15 mol %, more preferably 0 to 10 mol %, and these mol % are based on all the monomers constituting the semi-crystalline semi-aromatic polyamide.

[0020] In a preferred embodiment of the present invention, the semi-crystalline, semi-aromatic polyamide comprises repeating units derived from dicarboxylic acids and diamines, and 0 to 20 mol % of amino acids and / or lactams, these mol % being based on the total monomers constituting the semi-crystalline, semi-aromatic polyamide, The dicarboxylic acid is an aromatic dicarboxylic acid (a-1), or a combination of the aromatic dicarboxylic acid (a-1) and another dicarboxylic acid (a-2) including an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid. The aromatic dicarboxylic acid (a-1) is preferably present in an amount of 60 to 100 mol %, and the other dicarboxylic acid (a-2) is preferably present in an amount of 0 to 40 mol %, and these mol % are based on the total moles of the dicarboxylic acids constituting the semi-crystalline semi-aromatic polyamide. The diamine is an aliphatic diamine (b-1) or a combination of an aliphatic diamine (b-1) and an aromatic diamine (b-2). The aliphatic diamine (b-1) is preferably present in an amount of 80 to 100 mol %, and the aromatic diamine (b-2) is preferably present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the diamines constituting the semi-crystalline, semi-aromatic polyamide.

[0021] In a preferred embodiment of the present invention, the semi-crystalline, semi-aromatic polyamide comprises repeating units derived from dicarboxylic acids and diamines, and 0 to 20 mol % of amino acids and / or lactams, these mol % being based on the total monomers constituting the semi-crystalline, semi-aromatic polyamide, The dicarboxylic acid is an aliphatic dicarboxylic acid or a combination of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid. The aliphatic dicarboxylic acid is preferably present in an amount of 80 to 100 mol %, and the alicyclic dicarboxylic acid is preferably present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the dicarboxylic acids constituting the semicrystalline, semi-aromatic polyamide. The diamine is an aromatic diamine or a combination of an aromatic diamine and an aliphatic diamine, the aromatic diamine being preferably present in an amount of 80 to 100 mol % and the aliphatic diamine being preferably present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the diamines constituting the semi-crystalline, semi-aromatic polyamide.

[0022] The aromatic dicarboxylic acid in the present invention preferably contains 8 to 20 carbon atoms, more preferably 8 to 14 carbon atoms, and examples thereof include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and / or diphenyldicarboxylic acid.

[0023] The aliphatic dicarboxylic acid in the present invention preferably contains 4 to 36 carbon atoms, more preferably 6 to 36 carbon atoms, and most preferably 6 to 18 carbon atoms or 36 carbon atoms. Examples of the aliphatic dicarboxylic acid are succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid, and / or dimer acid having 36 carbon atoms, more preferably adipic acid, sebacic acid, and / or dodecanedioic acid.

[0024] The alicyclic dicarboxylic acid in the present invention preferably contains 4 to 20 carbon atoms, more preferably 8 to 20 carbon atoms, and more preferably contains one carbon main chain selected from the group consisting of cyclohexane, cyclopentane, cyclohexylmethane, dicyclohexylmethane, and bis(methylcyclohexyl), and most preferably is selected from the group consisting of 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, and cis- and trans-cyclohexane-1,4-dicarboxylic acid.

[0025] The aliphatic diamine in the present invention may be a linear aliphatic diamine or a branched aliphatic diamine, and is 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, and most preferably 6 to 12 carbon atoms. Examples of linear aliphatic diamines include 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, and 1,20-diamine. Cosanediamine and / or 1,22-docosanediamine, 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.

[0026] The aromatic diamine in the present invention is preferably selected from the group consisting of m-xylylenediamine (MXD), p-xylylenediamine (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'-biphenyldiamine, bis(4-methylaminophenyl)methane, and 2,2'-bis(4-methylaminophenyl)propane, and is more preferably MXD and / or PXD.

[0027] Examples of semi-crystalline, semi-aromatic polyamides are polyamide MXD6, polyamide PXD6, polyamide MXD9, polyamide PXD9, polyamide MXD10 and / or polyamide PXD10.

[0028] Suitable amino acids according to the present invention preferably contain 4 to 12 carbon atoms. Examples of amino acids are 4-aminobutanoic acid, 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid and / or 12-aminododecanoic acid.

[0029] Suitable lactams according to the present invention preferably contain 4 to 12 carbon atoms, more preferably 6 to 12. Examples of lactams are 2-pyrrolidone (γ-butyrolactam), 2-piperidone (δ-valerolactam), ε-caprolactam, capryllactam, decanelactam, undecanolactam, enantholactam and / or lauryllactam, preferably ε-caprolactam and / or undecanolactam.

[0030] In one preferred embodiment, the semi-crystalline, semi-aromatic polyamide comprises repeat units derived from a dicarboxylic acid and a diamine, The dicarboxylic acid is an aromatic dicarboxylic acid (a-1) or a combination of the aromatic dicarboxylic acid (a-1) and another dicarboxylic acid (a-2), the aromatic dicarboxylic acid (a-1) being terephthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, or a combination of at least two thereof, preferably terephthalic acid or a combination of terephthalic acid and naphthalenedicarboxylic acid, the other dicarboxylic acid (a-2) being an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid, the aromatic dicarboxylic acid (a-1) being The amount is preferably 60 to 100 mol%, more preferably 80 to 100 mol%, even more preferably 90 to 100 mol%, and most preferably 95 to 100 mol%, and these mol% are based on the total moles of dicarboxylic acids constituting the semicrystalline semi-aromatic polyamide. The amount of the other dicarboxylic acid (a-2) is preferably 0 to 40 mol%, more preferably 0 to 20 mol%, even more preferably 0 to 10 mol%, and most preferably 5 mol% or less, and these mol% are based on the total moles of dicarboxylic acids constituting the semicrystalline semi-aromatic polyamide. The diamine is an aliphatic diamine (b-1) or a combination of an aliphatic diamine and an aromatic diamine (b-2). The aliphatic diamine (b-1) is preferably present in an amount of 80 to 100 mol%, more preferably 90 to 100 mol%, and most preferably 95 to 100 mol%, based on the total moles of diamines constituting the semicrystalline, semi-aromatic polyamide. The aromatic diamine (b-2) is preferably present in an amount of 0 to 20 mol%, more preferably 0 to 10 mol%, and most preferably 0 to 5 mol%, based on the total moles of diamines constituting the semicrystalline, semi-aromatic polyamide.

[0031] In a preferred embodiment, the semi-crystalline semi-aromatic 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 another dicarboxylic acid (a-2), and a diamine; The aromatic dicarboxylic acid (a-1) contains 10 to 40 mol %, more preferably 15 to 30 mol %, and most preferably 20 to 30 mol % of isophthalic acid, and 60 to 90 mol %, more preferably 70 to 85 mol %, and most preferably 70 to 80 mol % of at least one aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, and biphenyldicarboxylic acid, preferably terephthalic acid or a combination of terephthalic acid and naphthalenedicarboxylic acid; and the other dicarboxylic acid (a-2) is an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid; The diamine is an aliphatic diamine (b-1) or a combination of an aliphatic diamine and an aromatic diamine (b-2). The aliphatic diamine (b-1) is preferably present in an amount of 90 to 100 mol %, more preferably 95 to 100 mol %, and the aromatic diamine (b-2) is preferably present in an amount of 0 to 10 mol %, more preferably 0 to 5 mol %, these mol % being based on the total moles of the diamines.

[0032] In a more preferred embodiment, the aliphatic dicarboxylic acid of the other dicarboxylic acid (a-2) is preferably adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, or octadecanedioic acid, more preferably adipic acid, sebacic acid, and / or dodecanedioic acid.

[0033] 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 the group consisting of 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 the group consisting of 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,4,4-trimethylhexamethylenediamine, and 2,2,4-trimethylhexamethylenediamine.

[0034] The polyamide in the present invention may comprise a polyamide copolymer or a blend of two or more polyamides and their copolymers.

[0035] The semi-crystalline semi-aromatic polyamide is preferably represented by the following notation: -R represents one or more linear aliphatic diamines; -B represents one or more branched aliphatic diamines; -T represents terephthalic acid; -I represents isophthalic acid, -A represents one or more aromatic diamines; -Y represents one or more aliphatic dicarboxylic acids; -V represents one or more lactams.

[0036] Suitable semi-crystalline, semi-aromatic polyamides are designated PA RT, PA RT / RI, PA RT / BT, PA RT / BT / RI / BI and comprise the following components: 60 to 100 mol % of (T), 0 to 40 mol % of (I), preferably 60 to 85 mol % of (T), 15 to 40 mol % of (I), more preferably 65 to 80 mol % of (T), 20 to 35 mol % of (I) (mol % is based on the total moles of (T) + (I)), and A linear aliphatic polyamide containing 80 to 100 mol % of (R), preferably 90 to 100 mol % of (R), and 0 to 20 mol % of (B), preferably 0 to 10 mol % of (B) (mol % is based on the total moles of (R) + (B)), where R preferably has 9 to 36 carbon atoms, more preferably 9 to 18 carbon atoms. Examples of these polyamides include PA4T / 4I, PA4T / 6I, PA5T / 5I, PA6T, PA6T / 6I, PA6T / 8T, PA6T / 10T, PA6T / 10I, PA9T, PA10T, PA12T, PA10T / 10I, PA6T / 9T, PA6T / 12T, PA4T / 6T / DT, PA4T / 10T / DT, PA4T / 4I / 6T / 6I / DT / DI, and PA6T / 12T / 6I / 12I. These include PA6T / 10T / 6I, PA4T / 6T / 4I / 6I, PA5T / 6T / 5I / 6I, PA5T / 4T / 5I / 4I, PA4T / 10T / 5I / 10I, PA4T / 6T / DT, PA4T / 10T / DT, and PA4T / 4I / 6T / 6I / DT / DI, preferably PA6T, PA9T, PA10T, PA6T / 6I, PA6T / 10T, PA6T / 12T, PA6T / 10T / 6I, PA6T / DT, and / or PA6T / DT / 6I / DI, where D is 2-methylpenta-methylenediamine or 3-methyl-1,5-pentanedimine, or a mixture thereof.

[0037] In a preferred embodiment, PA6T / 6I contains 65 to 80 mol % of (T) and 20 to 35 mol % of (I) based on the total moles of (T)+(I).

[0038] In a preferred embodiment, PA6T / 10T contains 10-60 mol% (6T) and 40-90 mol% (10T), preferably 10-40 mol% (6T) and 60-90 mol% (10T), based on the total moles of (T)+(I).

[0039] In one preferred embodiment, PA6T / 10T / 6I comprises 60-90 mol % (6T), 5-40 mol % (6I), and 5-45 mol % (10T), based on the total moles of (T)+(I).

[0040] Suitable semi-crystalline, semi-aromatic polyamides are designated PA RT / RY, PA RT / V, PA RT / RI / RY or PA RT / RI / V and comprise the following components: It contains 60 to 100 mol% of (T), 0 to 40 mol% of (I), 0 to 12 mol% of (V), preferably 0 to 5 mol% of (V), 0 to 80 mol% of (Y), preferably 0 to 60 mol% of (Y), more preferably 0 to 40 mol% of (Y) (mol% is based on the total moles of (T)+(I)+(V)+(Y)), and R is preferably a linear aliphatic polyamide having 9 to 36 carbon atoms, more preferably 9 to 18 carbon atoms. Examples of these polyamides include PA6T / 6, PA6T / 6I / 6, PA6T / 66, PA5T / 510, PA4T / 410, PA6T / 610, PA6T / 612, PA6T / 1012, PA9T / 612, PA9T / 1012, PA10T / 106, PA10T / 612, PA10T / 1012, PA6T / 6I / 66, PA6T / 10T / 6, PA10T / 12, PA10T / 11 and PA6T / 6I / 12, preferably PA6T / 6, PA6T / 610, PA6T / 10T / 6 and / or PA6T / 612.

[0041] In a preferred embodiment, PA RT / RY contains 60 to 100 mol % of (T) and 0 to 40 mol % of (Y), where R is 1,6-hexanediamine, 1,9-nonanediamine, or 1,10-decanediamine, and Y is dodecanedioic acid.

[0042] In one preferred embodiment, PA6T / 10T / 6 contains 60-85 mol % (6T), 15-40 mol % (10T), and 5-15 mol % caprolactam, based on the total moles of (T)+(I)+caprolactam.

[0043] The semi-crystalline, semi-aromatic polyamide of the present invention has a melting point (Tm) of 255° C. to 340° C., preferably 285° C. to 330° C., and most preferably 305° C. to 315° C. The melting point is defined as the temperature corresponding to the endothermic peak in a differential scanning calorimetry (DSC) curve, and is obtained by heating the polyamide using DSC at a heating rate of 10° C. / min.

[0044] The semi-crystalline, semi-aromatic polyamide in the present invention preferably has a viscosity number of 60 to 120 ml / g, measured in 96% by mass H2SO4 according to the ISO307-2007 method.

[0045] In one preferred embodiment, the semi-crystalline, semi-aromatic polyamides include polyamide MXD6, polyamide 12T, polyamide 10T, polyamide 9T, polyamide 6T / 66, polyamide 6T / DT, polyamide 66 / 6T / 6L, polyamide 6T / 6, polyamide 6T / 6I copolymers, and the like.

[0046] The term amorphous polyamide is understood herein to mean a polyamide that is essentially free of crystalline domains, as indicated 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 being expressed relative to the mass of the polyamide.

[0047] The amorphous polyamides of the present invention include amorphous aliphatic polyamides and / or amorphous semi-aromatic polyamides.

[0048] In a preferred embodiment, the amorphous aliphatic polyamide comprises an alicyclic diamine and an aliphatic dicarboxylic acid. The alicyclic diamine is preferably 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), or 4,4'-diaminodicyclohexylmethane. The amorphous aliphatic polyamide is selected from the group consisting of 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 are represented by PA CY, where C represents one or more alicyclic dicarboxylic acids. Examples of amorphous aliphatic polyamides include PA MACM6, PA PACM6, PA MACM12, PA PACM10, PA PACM12, and PA IPD6, and preferably PA MACM12 and / or PA PACM12.

[0049] In a preferred embodiment, the amorphous semi-aromatic polyamide comprises a cycloaliphatic diamine and an aromatic dicarboxylic acid. The cycloaliphatic diamine is preferably selected from PACM, MACM, and / or IPD. The aromatic dicarboxylic acid is preferably selected from terephthalic acid and / or isophthalic acid.

[0050] In a preferred embodiment, the amorphous semi-aromatic polyamide comprises a diamine and at least 50 mol% isophthalic acid, preferably 60-100 mol% isophthalic acid and 0-40 mol% terephthalic acid, based on the total moles of dicarboxylic acid. The amorphous semi-aromatic polyamide is represented by PA RI, PA RI / RT, PA BI / BT, PA CT, PA BT, PA CI, or PA BI, with an I / T molar ratio of at least 50 / 50, preferably 80:20 to 60:40. Examples of amorphous semi-aromatic polyamides include PA6I, PA8I, PA6I / 6T, PA10I / 10T, PA-PACMI, PA-PACMT, PA-MACMT, PA-MACMI, PA-IPDT, PA-IPDI, PA-DT / DI, PA-DT, and PA-DI, with PA6I / 6T and PA12I / 12T being preferred.

[0051] In a preferred embodiment, the amorphous semi-aromatic polyamide comprises an aromatic diamine and an aliphatic dicarboxylic acid, and optionally contains 0 to 20 mol% isophthalic acid. The amorphous semi-aromatic polyamide is represented by PA AY or PA AY / AI. An example of an amorphous semi-aromatic polyamide is PA MXD6 / MXDI, in which MXD6 is present in an amount of 80 to 100 mol%, preferably 85 to 95 mol%, based on the total moles of MXD6 and MXDI.

[0052] The amorphous polyamide in the present invention preferably has a viscosity number of 60 to 150 ml / g when measured in 96% by mass of H2SO4 according to the ISO307-2007 method.

[0053] The amorphous polyamide of the present invention preferably has a solution viscosity η in the range of 1.3 to 2.0, preferably in the range of 1.4 to 1.8, particularly in the range of 1.45 to 1.75, measured at 20°C in 0.5% by mass of m-cresol. rel It has.

[0054] The semi-crystalline, semi-aromatic polyamide (A) in the present invention is preferably present in an amount of 30% by mass to 65% by mass, more preferably 40% by mass to 60% by mass, and the amorphous polyamide (B) in the present invention is preferably present in an amount of 5% by mass to 40% by mass, more preferably 10% by mass to 30% by mass, these mass % being based on the total mass of the polyamide composition.

[0055] The weight ratio of component (A) / component (B) is greater than 1:1, preferably equal to or greater than 2:1, more preferably in the range of 3:1 to 2:1, and most preferably in the range of 3:1 to 2.5:1.

[0056] The needle-like filler (C) in the present invention preferably has an average length of 10 μm to 150 μm, more preferably 10 μm to 100 μm, and most preferably 10 μm to 75 μm. The aspect ratio (length / diameter) of the needle-like filler is preferably equal to or greater than 2:1, more preferably 2:1 to 5000:1, even more 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 of the cross section to the average outer diameter. The shape of the cross section is not limited and may be, for example, elliptical, circular, or rectangular.

[0057] The needle-like filler (C) in the present invention is preferably selected from the group consisting of glass fiber, wollastonite, carbon fiber, metal fiber, mineral fiber, potassium titanate, and aluminum borate, and more preferably glass fiber, chopped glass fiber, crushed glass fiber, potassium titanate, and / or wollastonite. The glass fiber is preferably 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 can be circular or noncircular, preferably circular.

[0058] The needle filler is preferably surface-treated with a silane coupling agent, such as a vinylsilane-based coupling agent, an acrylic silane-based coupling agent, an epoxy silane-based coupling agent, or an aminosilane-based coupling agent, preferably an aminosilane-based 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, urethane compounds, urethane / maleic acid derivative-modified compounds, and urethane / amine-modified compounds.

[0059] The plate-like filler (D) in the present invention is generally in the form of stacked plates, platelets, sheets, leaves, powders, or flakes. The aspect ratio (ECD / T) is generally greater than or equal to 1:1, preferably greater than or equal to 30:1, more preferably greater than or equal to 100:1, and most preferably greater than or equal to 200:1. The aspect ratio (ECD / T) is generally less than or equal to 1000:1, preferably less than or equal to 800:1, more preferably less than or equal to 600:1, and most preferably less than or equal to 500:1. ECD represents the equivalent circle diameter of the plate-like filler. T represents the maximum thickness of the plate-like filler. The aspect ratio and equivalent circle diameter can be measured using scanning electron microscope ("SEM") images. The equivalent circle diameter can be defined as the diameter of a circle having the same area as the plate area of ​​the plate-like filler.

[0060] In a preferred embodiment of the present invention, the flake-like filler (D) has an aspect ratio (ECD / T) of 1:1 to 500:1, preferably 100:1 to 500:1, and most preferably 200:1 to 400:1.

[0061] In a preferred embodiment of the present invention, the flake-like filler (D) has an average size such that its maximum thickness or dimension is from 0.001 μm to 100 μm, preferably from 0.001 μm to 50 μm, most preferably from 0.001 μm to 10 μm, or from 0.001 μm to 5 μm.

[0062] In one embodiment, the flake-like filler may have an average equivalent circular diameter of at least about 10 μm, typically 10 μm to 900 μm, preferably 20 μm to 500 μm, and most preferably 20 μm to 300 μm, or 30 μm to 200 μm.

[0063] In one embodiment of the present invention, the aspect ratio (ECD / T) of the flake-like filler is 1:1 to 300:1, and the average equivalent circle diameter of the flake-like filler is 20 μm to 300 μm.

[0064] The platy filler (D) in the present invention is preferably selected from the group consisting of talc, mica, silicates, quartz, titanium dioxide, wollastonite, kaolin, magnesium carbonate, magnesium hydroxide, chalk, limestone, feldspar, barium sulfate, solid or hollow glass beads, ground glass, glass flakes, and durable magnetic materials, such as magnetizable metal compounds, and / or alloys or mixtures thereof.

[0065] The semi-crystalline, semi-aromatic polyamide (A) in the present invention is preferably present in an amount of 30% by mass to 60% by mass, more preferably 30% by mass to 50% by mass, and the amorphous polyamide (B) in the present invention is preferably present in an amount of 10% by mass to 30% by mass, more preferably 10% by mass to 20% by mass, these mass % being based on the total mass of the polyamide composition.

[0066] The weight ratio of component (C) / component (D) is preferably equal to or greater than 1.5:1, more preferably in the range of 2:1 to 4:1.

[0067] The polyamide composition may contain various conventional additives (E), provided that the additives and their amounts do not significantly adversely affect the desired properties of the composition of the present invention, including lubricants, surface effect additives, antioxidants, colorants, pigments, stabilizers (heat, UV, radiation, or hydrolysis stabilizers), flow improvers, plasticizers, mold release agents, anti-drip agents, UV absorbers, nucleating agents, antistatic agents, elastomer modifiers, mold release agents, and / or antimicrobial agents.

[0068] The lubricant is not particularly limited, and examples thereof include esters, amides, alkali metal salts, and alkaline earth metal salts of fatty acids having 10 to 40 carbon atoms (e.g., Ca stearate, Zn stearate, Mg behenate, and Mg stearate), polyethylene wax, polypropylene wax, ester wax, EVA wax, oxidized polyethylene wax, fatty alcohols, fatty acids, montan wax, pentaerythrityl tetrastearate (PETS), and silicone wax. A preferred lubricant is ethylene bis(stearamide).

[0069] The lubricant is preferably present in an amount of about 0% to 3% by weight, more preferably about 0.01% to 2% by weight, or 0.2% to 1% by weight, or 0.2% to 0.8% by weight, these weight percentages being based on the total weight of the polyamide composition.

[0070] 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.

[0071] Examples of aromatic amine-based antioxidants are poly(1,2-dihydro-2,2,4-trimethyl-quinoline), 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-benzenediamine and hydrazine derivatives.

[0072] Examples of hindered phenol-based antioxidants are poly(oxy-1,2-ethanediyl)-alpha-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]-omega-[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-hydroxy-hydrocinnamate, and 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid C7-C9-branched alkyl esters. And preferably, the solid hindered phenol-based antioxidant is 2,4-bis[(dodecylthio)methyl]-o-cresol, 4,4'-butylidenebis-(3-methyl-6-tert-butylphenol), 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid octadecyl ester, pentaerythritol tetrakis(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].

[0073] Examples of phosphite-based antioxidants include tris(2,4-di-tert-butylphenyl)phosphite (Irgafos® 168, BASF SE, CAS 31570-04-4), bis(2,4-di-tert-butylphenyl)pentaerythrityl diphosphite (Ultranox® 626, Chemtura, CAS 26741-53-7), bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythrityl diphosphite (ADK Stab PEP-36, Adeka, CAS 80693-00-1), bis(2,4-dicumylphenyl)pentaerythrityl diphosphite (Doverphos® S-9228, Dover Chemical Corporation, CAS 154862-43-8), tris(nonylphenyl)phosphite (Irgafos® TNPP, BASF SE, CAS 26523-78-4), (2,4,6-tri-t-butylphenol)-2-butyl-2-ethyl-1,3-propanediol phosphite (Ultranox® 641, Chemtura, CAS 161717-32-4), and Hostanox® P-EPQ.

[0074] Examples of commercially available antioxidants are combinations of copper salts and iodides, such as Brueggolen® H3350 from Brueggemann-Gruppe or Polyad® PB201 from PolyAd Services.

[0075] The antioxidant is preferably present in an amount of about 0% to 2% by weight, more preferably about 0.01% to 1% by weight, and most preferably about 0.1% to 0.8% by weight, each of which is based on the total weight of the polyamide composition.

[0076] The colorant is not particularly limited, and examples thereof include carbon black, iron oxide, titanium dioxide, ultramarine blue, zinc sulfide, phthalocyanine, quinacridone, perylene, nigrosine, and anthraquinone.

[0077] The colorant is preferably present in an amount of about 0% to 5% by weight, more preferably about 0.01% to 3% by weight, and most preferably about 0.1% to 2% by weight, these weight percentages being based on the total weight of the polyamide composition.

[0078] The stabilizer is preferably present in an amount of about 0% to 2% by weight, more preferably about 0.01% to 1% by weight, and most preferably about 0.01% to 0.5% by weight, each of which is based on the total weight of the polyamide composition.

[0079] Examples of suitable nucleating agents are sodium or calcium phenylphosphinate, alumina (CAS number 1344-28-1), talc, silicon dioxide, adipic acid, and diphenylacetic acid.

[0080] Examples of suitable plasticizers are dioctyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, hydrocarbon oil, and N-(n-butyl)benzenesulfonamide.

[0081] The amount of any additive in the present invention is preferably 10% by weight or less, more preferably 5% by weight or less, and most preferably 2% by weight or less, these weight percentages being based on the total weight of the polyamide composition.

[0082] In a preferred embodiment, the polyamide composition comprises: as component (A), 30% to 60% by weight of a semicrystalline, semi-aromatic polyamide, preferably selected from the group consisting of 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, As component (B), 10% by mass to 30% by mass of an amorphous polyamide, preferably selected from the group consisting of PA6I / 6T and PA12I / 12T; 20% by mass to 40% by mass of a needle-like filler having an average length of 10 μm to 100 μm as component (C); As component (D), 5% by mass to 20% by mass of a plate-like filler having an average size whose maximum thickness or dimension is 0.001 μm to 50 μm; Component (E) is 0 to 5 wt. % of an additive (all of these wt. % are based on the total weight of the polyamide composition).

[0083] In a preferred embodiment, the polyamide composition comprises: as component (A), 30% to 60% by weight of a semicrystalline, semi-aromatic polyamide selected from the group consisting of 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, As component (B), 10% by mass to 30% by mass of an amorphous polyamide selected from the group consisting of PA6I / 6T and PA12I / 12T; 20% by mass to 40% by mass of a needle-like filler as component (C) having an average length of 10 μm to 100 μm and an aspect ratio (length / diameter) of 3:1 to 100:1; As component (D), 5% by mass to 20% by mass of a plate-like filler having an average size with a maximum thickness or dimension of 0.001 μm to 50 μm and an average equivalent circle diameter of 20 μm to 300 μm; Component (E) is 0 to 5 wt. % of an additive (all of these wt. % are based on the total weight of the polyamide composition).

[0084] The present invention also discloses a method for preparing a polyamide composition, which comprises feeding all components except an acicular filler and a platy filler into an extruder, feeding the acicular filler and the platy filler through a downstream feeder, and extruding and pelletizing all components. The extrusion is preferably carried out at a temperature of 320°C, preferably 280°C to 320°C. The polyamide composition is obtained in the form of pellets.

[0085] The present invention also discloses camera modules, lens assemblies, lens units, camera module assemblies and parts for optical elements made from the polyamide compositions of the present invention.

[0086] The present invention also provides methods of using the polyamide compositions in camera modules, lens assemblies, lens units, camera module assemblies and optical elements. [Example]

[0087] The present invention will be described in detail below with reference to examples, which should not be construed as limiting the scope of the present invention. In the examples and comparative examples, measurements and evaluations of physical properties were carried out as described below.

[0088] A: PA9T, Kuraray Co., Ltd. (viscosity number 79 cm³ according to ISO 307, 1157, 1628) 3 / g, number average molar mass (Mn) 9600 g / mol) B: PA6I / 6T, Zytel (registered trademark) HTN301, Dupont Co., Ltd. (intrinsic viscosity 1.19 g / cm 3 , according to ISO1183) C1: Wollastonite CaSiO3, Nyglos 4w, Imery Co. Ltd., average fiber length 63 μm and average diameter 7 μm C2: Glass fiber, HP3660, PPG Industries Inc., average diameter 10 μm and average length 4.5 mm D1: Glass flakes, MEG160FYX (6145), Nippon Sheet Glass Co., Ltd., average circular equivalent diameter 160 μm and thickness 0.7 μm D2: Mica KMg3(Si3Al)O 10 (FOH)2, 325-HK, Imery Co., Ltd, average particle size 30μm E1: Antioxidant AO1098, BNX1098, Mayzo Inc. E2: Lubricant, N,N'-ethylenedi(stearamide), Croda Trading (Shanghai) Co., Ltd. E3: Carbon black, Orion Engineered Carbons.

[0089] Examples 1 to 2 (E1, E2) and Comparative Examples 1 to 7 (C1 to C7) The formulations of the examples and comparative examples are shown in Table 1. The raw materials except for the filler were mixed using a Turbula T50A high-speed mixer and then charged into a Coperion ZSK26MC twin-screw extruder. The filler was fed using a downstream side feeder to maintain a good shape and aspect ratio, and the mixture was melt-extruded at a temperature of 320°C and pelletized to obtain a pelletized polyamide composition.

[0090] The dried pellets were processed using an injection molding machine KM130CX (Krauss Maffei) at a melt temperature of 300°C to 330°C with a clamping force of 130T to obtain test specimens.

[0091] The tensile strength, modulus, and elongation at break of 4 mm thick specimens were measured in accordance with ISO 527-1-2012. Type 1 specimens described in ISO 527-1-2012 were used.

[0092] HDT was tested at 0.45 MPa according to method A of ISO75-2-2013.

[0093] Charpy notched impact strength and Charpy unnotched impact strength were tested by edgewise impact in accordance with ISO 179-1-2010. For the Charpy unnotched test, Type 1 specimens with dimensions of 80 x 10 x 4 mm (length x width x thickness) were used. For the Charpy notched test, Type 1 specimens with notched Type A were used. All specimens were conditioned for 16 hours at 23°C and 50% relative humidity. Testing was carried out under the same atmosphere as the conditioning.

[0094] The flow length was measured using a spiral flow tool with a spiral runner. The cross section of the spiral runner was 2 mm thick and 5.5 mm wide, with numbers and centimeter-delimited markings along the runner. The test material was melted at 320°C, and the melt was then injected into the spiral runner at 500 bar pressure and 140°C. The spiral runner was filled through a sprue in the center of the spiral runner, and the pressure and temperature were maintained until melting stopped, with the number marked just at the tip of the spiral melt indicating the flow length.

[0095] The flatness (warpage) performance of the material was evaluated by visual inspection of a circular disk (diameter = 82 mm, thickness = 0.75 mm) molded under the same conditions, and was evaluated with two ratings: good and poor.

[0096] Dust particles in the materials were measured using a Rion KS-42D liquid particle counter. Specifically, a molded plastic part (a circular disk with a thickness of 0.75 mm and a diameter of 82 mm) was first rinsed with detergent and deionized water and then dried with nitrogen. The plastic part was then immersed in 500 ml of deionized water and cleaned in an ultrasonic cleaner for 5 minutes at 200 W output. The deionized water was then immediately pumped into the particle counter, and the dust particle concentration was counted. The particle detection range was set to 10 μm to 100 μm.

[0097] [Table 1]

[0098] From Table 1, it can be seen that the examples of the present invention maintain good fluidity, tensile properties, and impact properties, and have outstanding effects on reducing dust particles and warpage, and are particularly applicable to camera modules, optical elements, etc.

Claims

1. A polyamide composition comprising 30% to 70% by weight of a polyamide blend and 30% to 70% by weight of a filler blend, wherein the weight percentages are based on the total weight of the polyamide composition; The polyamide mixture includes a semi-crystalline, semi-aromatic polyamide as component (A) and an amorphous polyamide as component (B), and the mass ratio (A) / (B) is greater than 1:1; the filler mixture includes a needle-like filler having an average length of 100 μm or less as component (C) and a plate-like filler as component (D), and the mass ratio (C) / (D) is greater than 1:1; The aspect ratio of the length to the diameter of the needle-like filler (C) is equal to or greater than 2:1; The aspect ratio ECD / T of the platy filler (D) is equal to or greater than 30:1, where ECD represents the equivalent circle diameter of the platy filler and T represents the maximum thickness of the platy filler; the amorphous polyamide is selected from the group consisting of PA MACM6, PA PACM6, PA PACM10 and PA IPD6, PA6I, PA8I, PA6I / 6T, PA10I / 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; Polyamide composition.

2. the semi-crystalline, semi-aromatic polyamide comprises repeat units derived from dicarboxylic acids and diamines, and 0 to 20 mole % of amino acids and / or lactams, these mole % being based on the total monomers constituting the semi-crystalline, semi-aromatic polyamide; 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) including an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid, the aromatic dicarboxylic acid (a-1) is used in an amount of 60 to 100 mol % and the other dicarboxylic acid (a-2) is used in an amount of 0 to 40 mol %, and these mol % are based on the total moles of the dicarboxylic acids constituting the semi-crystalline semi-aromatic polyamide; the diamine is an aliphatic diamine (b-1) or a combination of an aliphatic diamine (b-1) and an aromatic diamine (b-2), the aliphatic diamine (b-1) is present in an amount of 80 to 100 mol % and the aromatic diamine (b-2) is present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the diamines constituting the semi-crystalline, semi-aromatic polyamide; Alternatively, the dicarboxylic acid is an aliphatic dicarboxylic acid or a combination of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid, the aliphatic dicarboxylic acid being present in an amount of 80 to 100 mol % and the alicyclic dicarboxylic acid being present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the dicarboxylic acids constituting the semicrystalline semi-aromatic polyamide, and the diamine is an aromatic diamine or a combination of an aromatic diamine and an aliphatic diamine, the aromatic diamine being present in an amount of 80 to 100 mol % and the aliphatic diamine being present in an amount of 0 to 20 mol %, these mol % being based on the total moles of the diamines constituting the semicrystalline semi-aromatic polyamide. The polyamide composition of claim 1.

3. The aromatic dicarboxylic acid (a-1) is selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, or a combination of at least two thereof, and the other dicarboxylic acid (a-2) is selected from the group consisting of adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, and octadecanedioic acid; 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 selected from the group consisting of 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; 3. The polyamide composition according to claim 2, wherein the branched aliphatic diamine (b-1b) is selected from the group consisting of 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,4,4-trimethylhexamethylenediamine, and 2,2,4-trimethylhexamethylenediamine.

4. The aromatic dicarboxylic acid (a-1) contains 10 to 40 mol% of isophthalic acid and 60 to 90 mol% of at least one dicarboxylic acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, and biphenyldicarboxylic acid, and the other dicarboxylic acid (a-2) is contained in an amount of 0 to 10 mol% based on the total moles of the dicarboxylic acids constituting the semi-crystalline, semi-aromatic polyamide; The diamine comprises 90 to 100 mol % of an aliphatic diamine (b-1), or a combination of an aliphatic diamine and 0 to 10 mol % of an aromatic diamine (b-2), and these mol % are based on the total moles of the diamines constituting the semi-crystalline, semi-aromatic polyamide. The polyamide composition according to claim 2 or 3.

5. A polyamide composition described in any one of claims 1 to 4, excluding those containing a foaming agent.

6. 6. The polyamide composition according to claim 1, wherein the semi-crystalline, semi-aromatic polyamide (A) is present in an amount of 30% to 65% by weight and the amorphous polyamide (B) of the invention is present in an amount of 5% to 40% by weight, said weight percentages being based on the total weight of the polyamide composition.

7. 7. The polyamide composition according to claim 1, wherein the weight ratio of component (A) to component (B) is greater than or equal to 2:

1.

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

1.

9. 9. The polyamide composition according to claim 1, wherein the needle-like filler (C) has an average length of 10 μm to 100 μm.

10. A polyamide composition according to any one of claims 1 to 9, wherein the aspect ratio ECD / T of the plate-like filler (D) is equal to or less than 1000:

1.

11. 11. The polyamide composition according to claim 1, wherein the platy filler (D) has an average size with a maximum thickness of 0.001 μm to 100 μm.

12. 12. The polyamide composition according to claim 1, wherein the platy filler has an average equivalent circular diameter of at least 10 μm.

13. 13. The polyamide composition according to any one of claims 1 to 12, wherein the weight ratio of component (C) / component (D) is greater than or equal to 1.5:

1.

14. 13. A method for producing the polyamide composition according to any one of claims 1 to 12, comprising feeding all components other than the needle-like filler and the plate-like filler to an extruder, feeding the needle-like filler and the plate-like filler via a downstream feeder, and extruding and pelletizing all components.

15. 14. Camera modules, lens assemblies, lens units, camera module assemblies and components for optical elements made from the polyamide composition of any one of claims 1 to 13.

16. Use of the polyamide composition according to any one of claims 1 to 13 in camera modules, lens assemblies, lens units, camera module assemblies and optical elements.

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