Polyamide composition

Abstract

The present invention relates to a polyamide composition for preparing an LED component, comprising, based on the total weight of the polyamide composition, 30 to 97 wt. % of (A) at least one semi-crystalline, semi-aromatic polyamide; 2 to 50 wt. % of (B) at least one white pigment; 0.1 to 2 wt. % of (C) at least a phosphorus-containing heat stabilizer; 0.1 to 4.5 wt. % of (D) at least one alkali salt having a pH greater than 7; and, optionally, 0 to 50 wt. % of (E) at least one filler. The present invention exhibits excellent initial reflectance and little decrease in reflectance after thermal aging at high test temperatures for extended periods. It has also been found that the polyamide composition maintains balanced mechanical properties. The present invention also relates to an LED component made from the polyamide composition, which can be manufactured or assembled by a reflow soldering process.

Description

[Technical Field]

[0001] The present invention relates to a polyamide composition for preparing an LED component.

[0002] Background of the Invention Plastic materials are widely used in areas where yellowing prevention is required, such as consumer parts, automotive exterior parts, or outdoor housings for highly reflective applications, more specifically in the manufacture of light-emitting diode (LED) components. Among these, polyamides, particularly semi-aromatic polyamides, are widely used as low-cost, easily processable alternatives to ceramics for LED components such as housings, reflectors, and reflectors, where excellent heat resistance and high light reflectivity are desired. One continuing problem plaguing polyamide compositions used in LED applications is their tendency to yellow when exposed to heat during manufacturing or under environmental conditions during use.

[0003] In recent years, the development of surface mount technology (SMT) has progressed rapidly. SMT is basically a component assembly technology for the manufacture of electronic circuits, in which components are directly mounted or placed on the surface of a printed circuit board (PCB) using a batch reflow soldering process. SMT has the advantages of miniaturization of electronic components, higher packaging density, efficiency of the soldering process, and lower cost than the plated-through-hole insertion process, making SMT an essential player in the trend toward smaller and lighter electronic products. However, the disadvantage of SMT is that the processing temperature exceeds 250°C, which causes a significant decrease in reflectivity in LED applications.

[0004] US Patent No. 7,009,029 describes a highly reflective thermoplastic polyphthalamide (PPA) molding composition containing a white pigment titanium dioxide having a well-controlled particle size with an average particle size of 0.1 to 0.5 μm.

[0005] WO 2013 / 026779 describes a polyamide composition with improved reflectance after thermal aging by using metal oxide and titanium dioxide additives. Titanium dioxide can be added in an amount of 10 to 30 wt%. The polyamide composition can also contain a filler, preferably in an amount greater than 5 wt%. The reflectance ratio is tested after 10 minutes at 260°C. However, a 10-minute aging time cannot meet manufacturing requirements.

[0006] Chinese Patent No. 105602243 describes a polyamide composition having a white pigment, a reinforcing filler, and a stabilizer package containing elemental magnesium to elemental phosphorus. It was found that by controlling the magnesium to phosphorus ratio within the range of 0.1 to 1000, the initial whiteness of the polyamide composition can be made 90 or more, and the whiteness can be maintained at 80 or more after aging at 180°C for 4 hours.

[0007] In particular, when the aging temperature is very high, such as in the reflow soldering process (250°C or higher), or when the aging time is very long (500 hours or longer), these improvements are still not sufficient for practical use. Compared with conventional thermosetting or ceramic materials, there is still some gap in terms of anti-yellowing performance. Therefore, there is a great need and market value for developing plastic compositions with better reflective performance during molding and after thermal aging.

[0008] Summary of the Invention The present inventors have attempted to solve the above problems and have found that a combination of a semi-aromatic polyamide, a white pigment, a phosphorus compound, and a heat stabilizer blend containing an inorganic or organic salt having a pH value higher than 7 exhibits excellent initial reflectance and a small decrease in reflectance after long-term heat aging at a high test temperature. It has also been found that the polyamide composition maintains balanced mechanical properties.

[0009] The present invention also provides LED components made from the polyamide compositions, which can be manufactured or assembled by a reflow soldering process.

[0010] Detailed Description of the Invention Unless otherwise defined, all technical and scientific terms used herein have the meanings commonly understood by those skilled in the art to which the present invention belongs.The basic definitions or explanations set forth above in the general terms or preferred ranges apply to the final product, and correspondingly to the starting materials and intermediates.These basic definitions can be combined with each other as desired, that is, include the combinations between the general definitions and / or the respective preferred ranges and / or embodiments.

[0011] All embodiments and preferred embodiments disclosed herein can be combined as desired and are considered to be within the scope of the present invention.

[0012] The terms "a," "an," and "the" are used interchangeably with the term "at least one." The phrases "at least one of" and "comprises at least one of," following a list, refer to any one of the items in the list, and any combination of two or more items in the list. All numerical ranges include their endpoints and non-integer values ​​between the endpoints, unless otherwise stated.

[0013] The term "about" refers to a range of numbers that one of skill in the art would consider equivalent to the recited value, in the context of achieving the same function or result.

[0014] Unless otherwise specified, all percentages (%) are "percent by weight."

[0015] The term "unit" refers to the repeating units that make up a polyamide, unless otherwise specified.

[0016] As used herein, the term "PA" refers to polyamide. The term "PA* / PA**" refers to a copolymer of PA* and PA**.

[0017] Disclosed is a polyamide composition for preparing an LED component, comprising, based on the total weight of the polyamide composition, 30 to 97 wt % of (A) at least one semi-crystalline, semi-aromatic polyamide, 2 to 50 wt % of (B) at least one white pigment, 0.1 to 2 wt % of (C) at least a phosphorus-containing heat stabilizer, 0.1 to 4.5 wt % of (D) at least one alkali salt having a pH greater than 7, and optionally 0 to 50 wt % of (E) at least one filler.

[0018] The term "semicrystalline polyamide" is understood herein to be a semi-aromatic polyamide having crystalline domains as evidenced by the presence of a melting peak with a melting enthalpy of at least 5 J / g, measured by differential scanning calorimetry (DSC) according to ISO 11357 at a heating rate of 10 K / min.

[0019] The semi-crystalline, semi-aromatic polyamides of the present invention comprise dicarboxylic acid units, diamine units, and optionally units derived from other monomers such as amino acids and / or lactam units, where the dicarboxylic acid units or diamine units have aromatic groups. For example, the semi-aromatic polyamides comprise aromatic dicarboxylic acid units and aliphatic diamine units, or aliphatic and / or alicyclic dicarboxylic acid units and aromatic diamine units.

[0020] The aromatic dicarboxylic acid unit can typically be derived from an aromatic dicarboxylic acid and / or an aromatic dicarboxylic acid chloride. The aliphatic dicarboxylic acid unit can typically be derived from an aliphatic dicarboxylic acid and / or an aliphatic dicarboxylic acid chloride. The alicyclic dicarboxylic acid unit can typically be derived from an alicyclic dicarboxylic acid and / or an alicyclic dicarboxylic acid chloride.

[0021] The aliphatic or aromatic diamine units may typically be derived from an aliphatic or aromatic diamine, respectively.

[0022] The amount of the other monomer is preferably 0 to 20 mol %, more preferably 0 to 15 mol %, and even more preferably 0 to 10 mol %, based on all units constituting the semi-crystalline semi-aromatic polyamide.

[0023] The aromatic dicarboxylic acid in the present invention preferably contains 8 to 20 carbon atoms, more preferably 8 to 14 carbon atoms, and is, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and / or diphenyldicarboxylic acid, and more preferably, terephthalic acid, a mixture of terephthalic acid and isophthalic acid, naphthalenedicarboxylic acid, or a mixture of terephthalic acid and naphthalenedicarboxylic acid.

[0024] 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 20 carbon atoms or 36 carbon atoms, for example, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, and / or 36 carbon atoms. Examples of the aliphatic dicarboxylic acid include 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, dimer acids having 36 carbon atoms, and mixtures thereof, more preferably adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, and mixtures thereof.

[0025] 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 skeleton selected from the group consisting of cyclohexane, cyclopentane, cyclohexylmethane, dicyclohexylmethane, bis(methylcyclohexyl), and mixtures thereof, 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, cis- and trans-cyclohexane-1,4-dicarboxylic acid, and mixtures thereof.

[0026] The aliphatic diamine in the present invention may 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, and most preferably 4 to 14 carbon atoms, for example, 4, 6, 8, 9, 10, 11, 12, 13, or 14 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, 1,20-eicosanediamine, 1,22-docosanediamine, and and mixtures thereof, preferably 1,6-hexanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, and mixtures thereof, and more preferably 1,6-hexanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, and mixtures thereof. 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, 2,4-dimethyloctanediamine and mixtures thereof, preferably 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,4,4-trimethylhexamethylenediamine, 2,2,4-trimethylhexamethylenediamine and mixtures thereof.

[0027] 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, 2,2'-bis(4-methylaminophenyl)propane, and mixtures thereof, and more preferably MXD and / or PXD.

[0028] Suitable amino acids in the present invention preferably contain 4 to 20 carbon atoms, more preferably 4 to 14 carbon atoms, for example 9, 10, 11, 12 or 13. Examples of amino acids are 4-aminobutanoic acid, 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 9-aminononanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and mixtures thereof.

[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, decanolactam, undecanolactam, enantholactam and / or lauryllactam, preferably ε-caprolactam and / or undecanolactam.

[0030] In a preferred embodiment of the present invention, the semi-crystalline semi-aromatic polyamide comprises dicarboxylic acid units and diamine units, and 0 to 20 mol % of units derived from an amino acid and / or a lactam, based on the total moles of units constituting the semi-crystalline semi-aromatic polyamide; i. The dicarboxylic acid units are derived from aromatic dicarboxylic acids and / or aromatic dicarboxylic acid chlorides (a-1), or a combination of the aromatic dicarboxylic acids and / or aromatic dicarboxylic acid chlorides (a-1) with other dicarboxylic acids (a-2) including aliphatic dicarboxylic acids and / or alicyclic dicarboxylic acids. The aromatic dicarboxylic acids and / or aromatic dicarboxylic acid chlorides (a-1) are preferably used in an amount of 60 to 100 mol %, and the other dicarboxylic acids (a-2) are preferably used in an amount of 0 to 40 mol %, based on the total moles of dicarboxylic acid units constituting the semi-crystalline semi-aromatic polyamide. The diamine units are derived from 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 % based on the total moles of the diamine units constituting the semi-crystalline, semi-aromatic polyamide. ii. The dicarboxylic acid units are derived from an aliphatic dicarboxylic acid or a combination of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid. Based on the total moles of dicarboxylic acid units constituting the semi-crystalline semi-aromatic polyamide, 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 %; The diamine units are derived from aromatic diamines or a combination of aromatic and aliphatic diamines, and the aromatic diamines are preferably present in an amount of 80 to 100 mol % and the aliphatic diamines are preferably present in an amount of 0 to 20 mol % based on the total moles of the diamine units constituting the semi-crystalline, semi-aromatic polyamide.

[0031] In a preferred embodiment, the semi-crystalline, semi-aromatic polyamide comprises dicarboxylic acid units and diamine units, and the dicarboxylic acid units are derived from an aromatic dicarboxylic acid and / or an aromatic dicarboxylic acid chloride (a-1), or a combination of an aromatic dicarboxylic acid and / or an aromatic dicarboxylic acid chloride (a-1) with another dicarboxylic acid (a-2), including an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid. The aromatic dicarboxylic acid (a-1) is terephthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, a combination of terephthalic acid and isophthalic acid, or a combination of terephthalic acid and naphthalenedicarboxylic acid, and the aromatic dicarboxylic acid and / or aromatic dicarboxylic acid chloride (a-1) is preferably in an amount of 60 to 100 mol%, more preferably 80 to 100 mol%, even more preferably 90 to 100 mol%, and most preferably 95 to 100 mol%, based on the total moles of dicarboxylic acid units constituting the semicrystalline semi-aromatic polyamide, and the other dicarboxylic acid (a-2) is preferably in an amount of 0 to 40 mol%, more preferably 0 to 20 mol%, even more preferably 0 to 10 mol%, and most preferably 5 mol% or less, based on the total moles of dicarboxylic acid units constituting the semicrystalline semi-aromatic polyamide, The diamine units are derived from 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, semiaromatic 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 diamine units constituting the semicrystalline, semiaromatic polyamide.

[0032] In a preferred embodiment, the semi-crystalline semi-aromatic polyamide comprises dicarboxylic acid units and diamine units, the dicarboxylic acid units being derived from an aromatic dicarboxylic acid (a-1) and 0 to 10 mol %, more preferably 0 to 5 mol % of another dicarboxylic acid (a-2), the aromatic dicarboxylic acid (a-1) comprising 10 to 40 mol %, more preferably 15 to 30 mol %, most preferably 20 to 30 mol % of isophthalic acid and 60 to 90 mol %, more preferably 70 to 85 mol %, 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 alicyclic dicarboxylic acid, the mole percentages being based on the total moles of dicarboxylic acid units constituting the semi-crystalline semi-aromatic polyamide, The diamine units are derived from an aliphatic diamine (b-1) or a combination of an aliphatic diamine and an aromatic diamine (b-2). Based on the total moles of diamine units constituting the semi-crystalline, semi-aromatic polyamide, 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%.

[0033] 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, pentadecanoic acid, hexadecanedioic acid, or octadecanedioic acid, more preferably adipic acid, sebacic acid, and / or dodecanedioic acid.

[0034] 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.

[0035] Examples of semi-crystalline, semi-aromatic polyamides are polyamide MXD6, polyamide PXD6, polyamide MXD9, polyamide PXD9, polyamide MXD10 and / or polyamide PXD10.

[0036] The polyamides in the present invention may include polyamide copolymers or blends of two or more polyamides and their copolymers.

[0037] Semi-crystalline semi-aromatic polyamides are -R represents one or more of a linear aliphatic diamine and a branched aliphatic diamine; -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 of the lactams This is aptly represented by the annotation:

[0038] Suitable semi-crystalline semi-aromatic polyamides are Based on the total moles of -(T)+(I), 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), and 100 mol % of (R), where R is a linear or branched aliphatic polyamide preferably having 4 to 36 carbon atoms, more preferably having 6 to 18 carbon atoms. It can be represented by PART, PART / RI, PART / BT, PART / BT / RI / BI, including

[0039] Examples of these polyamides are PA4T / 4I, PA4T / 6I, PA5T / 5I, PA6T, PA6T / 6I, PA6T / 8T, PA6T / 10T, PA6T / 10I, PA9T, PA10T, PA12T, PA 10T / 10I, PA6T / 9T, PA6T / 12T, PA4T / 6T / DT, PA4T / 10T / DT, PA4T / 4I / 6T / 6I / DT / DI, PA6T / 12T / 6I / 12I, PA6T / 10T / 6I, The compound includes PA4T / 6T / 4I / 6I, PA5T / 6T / 5I / 6I, PA5T / 4T / 5I / 4I, PA4T / 10T / 5I / 10I, PA4T / 6T / DT, PA4T / 10T / DT, or PA4T / 4I / 6T / 6I / DT / DI, and preferably PA6T, PA9T, PA10T, PA6T / 6I, PA6T / 10T, PA6T / 12T, PA6T / 10T / 6I, PA6T / DT, or PA6T / DT / 6I / DI, where D is 2-methylpenta-methylenediamine or 3-methyl-1,5-pentanediamine, or a mixture thereof, and D is in an amount of 0 to 20 mol %, preferably 0 to 10 mol %, of the total moles of (R).

[0040] In a preferred embodiment, PA6T / 6I contains 65 to 80 mol % of (T) and 20 to 35 mol % of (I).

[0041] In a preferred embodiment, PA6T / 10T contains 10 to 60 mol % of (6T) and 40 to 90 mol % of (10T), preferably 10 to 40 mol % of (6T) and 60 to 90 mol % of (10T).

[0042] In one preferred embodiment, PA6T / 10T / 6I contains 60-90 mol % of (6T), 5-40 mol % of (6I) and 5-45 mol % of (10T).

[0043] In one preferred embodiment, PA6T / 10T / 6 contains 60-85 mol % of (6T), 15-40 mol % of (10T), and 5-15 mol % of caprolactam.

[0044] Suitable semi-crystalline semi-aromatic polyamides are - Based on the total moles of (T) + (I) + (V) + (Y), 60 to 100 mol % of (T), 0 to 40 mol % of (I), 0 to 10 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). wherein R is a linear aliphatic polyamide preferably having 9 to 36 carbon atoms, more preferably 9 to 18 carbon atoms. Examples of these polyamides include PA6T / 6, PA6T / 12, 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, PA10T / 12, PA10T / 11, and PA6T / 6I / 12, preferably PA6T / 6, PA6T / 610, or PA6T / 612.

[0045] In a preferred embodiment, PART / 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.

[0046] The semi-crystalline, semi-aromatic polyamide of the present invention has a melting temperature (Tm) of 250° C. to 350° C., preferably 280° C. to 320° C., and most preferably 305° C. to 315° C. The melting temperature is defined as the temperature corresponding to the endothermic peak in a differential scanning calorimetry (DSC) curve, which is obtained by DSC measurement at a heating rate of 10 K / min in accordance with ISO 11357.

[0047] The semi-crystalline semi-aromatic polyamide of the present invention preferably has a viscosity number of 50 to 150 ml / g when measured in sulfuric acid with a concentration of 96% by weight in accordance with the ISO307-2007 method.

[0048] In one preferred embodiment, the semi-crystalline, semi-aromatic polyamide is selected from polyamide MXD6, polyamide 12T, polyamide 10T, polyamide 9T, polyamide 6T / 66, polyamide 6T / DT, polyamide 66 / 6T / 61, polyamide 6T / 6, polyamide 6T / 6I copolymers, and mixtures thereof.

[0049] The semi-crystalline semi-aromatic polyamide can be produced by a conventionally known method such as a melt polymerization method or a solution polymerization method.

[0050] The semi-crystalline, semi-aromatic polyamides disclosed herein should not be limited to those prepared from virgin crude oil monomers, but may be fully or at least partially biobased or derived from waste streams or recycling activities, i.e., the polyamides used herein can be based on renewable, secondary, or recycled materials. For example, PA6T / 6, PA6T / 12, PA6T / 6I / 6, PA6T / 66, PA6T / 610, PA6T / 612, PA6T / 1012, PA9T / 612, PA9T / 1012, PA10T / 106, PA10T / 612, PA10T / 1012, PA6T / 6I / 66, PA10T / 12, PA10T / 11, and PA6T / 6I / 12 used as component (A) herein can be prepared, obtained, or derived from monomers obtained in a remonomerization process.

[0051] The semi-crystalline, semi-aromatic polyamide in the present invention is present in an amount of 30% by weight to 97% by weight, preferably 40% by weight to 85% by weight, more preferably 45% by weight to 80% by weight, for example, 45% by weight, 50% by weight, 55% by weight, 60% by weight, 65% by weight, 70% by weight, 75% by weight, 80% by weight, based on the total weight of the polyamide composition.

[0052] White pigment The white pigment in the present invention is preferably titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, titanium hydroxide, zinc hydroxide, magnesium hydroxide, zirconium hydroxide, zinc sulfate, calcium sulfate, zinc sulfide, aluminum phosphate, magnesium carbonate, or a mixture thereof. Among the white pigments, titanium oxide is preferred.

[0053] The white pigment is not limited in size or shape and can be in the form of particles, whiskers or fibers, preferably particles.

[0054] The white pigment can be surface-treated by existing methods using coupling agents such as silane coupling agents, titanium coupling agents, acrylic silane coupling agents, epoxy silane coupling agents, amino silane coupling agents, for example, vinyl triethoxy silane, polydimethyl siloxane, 2-aminopropyl triethoxy silane, 2-glycidoxypropyl triethoxy silane, and the like, and combinations thereof.

[0055] In a preferred embodiment, the white pigment is titanium oxide, which exhibits better light reflectance and photostability. The particle size of titanium oxide is preferably 100 to 500 nm, more preferably 200 to 400 nm. The titanium dioxide can also be treated with an inorganic surface treatment agent. Surface treatment of titanium oxide can improve wettability with polyamide. Examples of inorganic surface treatment agents can be selected from the group consisting of alumina, silica, zirconia, sodium silicate, sodium aluminate, sodium aluminosilicate, zinc oxide, mica, etc. The inorganic surface treatment agents may be used alone or in combination.

[0056] The amount of the white pigment in the present invention is preferably 2% by weight to 50% by weight, more preferably 10% by weight to 50% by weight, even more preferably 20% by weight to 50% by weight, and most preferably 20% by weight to 40% by weight, for example, 20% by weight, 25% by weight, 30% by weight, 35% by weight, or 40% by weight, based on the total weight of the polyamide composition.

[0057] Phosphorus-containing heat stabilizer The phosphorus-containing heat stabilizer has been found to provide polyamide compositions with better optical properties and heat resistance compared to other heat stabilizers, and is selected from the group including, but not limited to, organic phosphinates, inorganic hypophosphites, organic phosphonates, inorganic phosphonates, organic phosphinates, and mixtures thereof, with organic phosphonates and organic phosphinates being preferred.

[0058] The organic phosphonates of the present invention are metal or ammonium salts of phosphonic acid or derivatives thereof. The metals can be alkali metals, alkaline earth metals, and other common metals. Examples of metals include sodium, potassium, lithium, magnesium, calcium, barium, aluminum, and mixtures thereof, with sodium, potassium, or magnesium being preferred. The phosphonic acid derivatives can be alkyl or aryl-substituted phosphonic acids. The alkyl groups preferably have 1 to 6 carbon atoms. Preferred phosphonic acid derivatives are phenylphosphonate, diphenylphosphonate, ethylphosphonate, and diethylphosphonate.

[0059] In one preferred embodiment, the organic phosphonate is selected from the group consisting of sodium phosphonate, potassium phosphonate, sodium phenylphosphonate, potassium phenylphosphonate, lithium phenylphosphonate, sodium ethylphosphonate, potassium ethylphosphonate, and ammonium phosphonate.

[0060] The inorganic phosphonates of the present invention have the following general formula: [(HO)PO] 2- p / 2 Kat or [(HO)2PO] - p Kat p+ where Kat is a p-valent cation, in particular a cation of an alkali metal or alkaline earth metal, an ammonium cation and / or a cation of Fe, Zn or especially Al (including the cations Al(OH) or Al(OH)2), and p is 1, 2, 3 or 4. Preferably, the inorganic phosphonate is aluminum phosphite [Al(H2PO3)3].

[0061] The inorganic hypophosphite in the present invention is a metal salt or ammonium salt of hypophosphorous acid. The metal can be an alkali metal, an alkaline earth metal, or other common metal. Examples of the metal include sodium, potassium, lithium, magnesium, calcium, barium, aluminum, and mixtures thereof, and preferably sodium, potassium, or magnesium.

[0062] In one preferred embodiment, the inorganic hypophosphite is selected from the group consisting of sodium hypophosphite, potassium hypophosphite, lithium hypophosphite, magnesium hypophosphite, calcium hypophosphite and ammonium hypophosphite.

[0063] The organic phosphinate salt of the present invention is represented by Formula I [ka] (Wherein, Ar is C6 to C 18 aryl, and X is a metal cation selected from Na, Ca, Mg, Al, or Zn. 18 The aryl may be unsubstituted or may be C1-C 10 Alkyl, C3-C 10 Cycloalkyl, C1-C 10 Alkoxy, C3-C 10 Cycloalkoxy, C1-C 10 Alkylthio, C3-C 10 Cycloalkylthio, C1-C 10 Alkylamino, C3-C 10 Cycloalkylamines, C6-C 18 Aryl, C6-C 18 Aryloxy, C6-C 18 Arylthio, C6-C 18 It may be substituted with a substituent such as arylamino, halogen, or a combination thereof. Preferably, it is C6 to C 18 Aryl is C6-C 16 Aryl, preferably C6-C 14 Aryl, more preferably C6-C 12 It may be aryl, most preferably phenyl or naphthyl. Preferably, the phosphinate is sodium benzenephosphinate.

[0064] In one preferred embodiment of the present invention, the phosphorus-containing heat stabilizers are organic phosphinates and organic phosphonates, which further exhibit better anti-yellowing and higher hydrolysis resistance at elevated temperatures.

[0065] In one preferred embodiment of the present invention, the organic phosphinate is sodium benzenephosphinate.

[0066] In one preferred embodiment of the present invention, the organic phosphonates are sodium and potassium phosphonates.

[0067] The size of the phosphorus-containing heat stabilizer is not limited, and a preferred specific size is 100 to 600 μm.

[0068] The phosphorus-containing heat stabilizer in the present invention is preferably in an amount of 0.1 wt % to 2 wt %, more preferably 0.1 wt % to 1 wt %, most preferably 0.2 to 0.8 wt %, for example, 0.2 wt %, 0.3 wt %, 0.4 wt %, 0.5 wt %, 0.6 wt %, 0.7 wt %, 0.8 wt %, based on the total weight of the polyamide composition.

[0069] alkaline salts In the present invention, an alkali salt, also called a basic salt, is a salt that is the product of the incomplete neutralization of a strong base and a weak acid. An alkali salt essentially consists of an ionic aggregate of positively charged cations and negatively charged anions, where the cations come from the positively charged cations of the strong base and the anions come from the negatively charged anions of the weak acid.

[0070] A strong base is a basic compound that can remove a proton from a molecule even with a very weak acid in an acid-base reaction. The strong base is preferably a hydroxide of an alkali metal, alkaline earth metal, or ammonium salt, such as lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), rubidium hydroxide (RbOH), cesium hydroxide (CsOH), magnesium hydroxide (Mg(OH)), calcium hydroxide (Ca(OH), strontium hydroxide (Sr(OH), barium hydroxide (Ba(OH), tetramethylammonium hydroxide (N(CH)OH). Therefore, the positively charged cation of the alkali salt in the present invention is a lithium ion (Li + ), sodium ions (Na + ), potassium ions (K + ), rubidium ion (Rb), cesium ion (Cs), magnesium ion (Mg 2+ ), calcium ions (Ca 2+ ), strontium ions (Sr 2+ ), barium ions (Ba 2+ ) and tetramethylammonium ion (N(CH3)4 + ), preferably earth metal ions such as magnesium ions, calcium ions and barium ions, more preferably calcium ions and barium ions.

[0071] Weak acids are acids that do not completely dissociate into their constituent ions when dissolved in a solution. Weak acids are preferably inorganic and organic. Examples of inorganic weak acids include hydrofluoric acid (HF), nitrous acid (HNO), sulfurous acid (HSO), carbonic acid (HCO), and phosphoric acid (HPO). Examples of organic acids include formic acid (HCOOH), acetic acid (CHCOOH), benzoic acid (CHCOOH), citric acid (HOC(COH)(CHCOH)), oxalic acid (CHO), acrylic acid (CH=CHCOOH), and phosphoric acid (HPO). Organic acids may be in the form of a polymer, such as polyacrylic acid, having a weight-average molecular weight of approximately 3,000 to 100,000. When the organic acid is in the form of a polymer, the molecular weight and synthesis method are not limited.

[0072] Therefore, the negatively charged anion of the alkali salt in the present invention is formate (HCOO - ), acetate (CH3COO - ), carbonate (CO3 2- ), citrate (HOC(COO - )(CH2COO - )2), fluoride (F - ), nitrite (NO 2- ), benzoate (C6H5COO - ), sulfite (SO3 2- ), acrylates (CH2=CHCOO - ), dihydrogen phosphate ([H2PO4] - ), hydrogen phosphate ([HPO4] 2- ) and phosphate ([PO4] 3- ) can be selected from the group consisting of

[0073] The alkali salts in the present invention have a pH value higher than 7, as defined and measured according to ISO 23496-2019.

[0074] In one preferred embodiment of the present invention, the alkali salt is selected from the group including, but not limited to, calcium carbonate, strontium carbonate, barium carbonate, sodium acrylate, calcium acrylate, potassium acrylate, sodium polyacrylate, calcium polyacrylate, potassium polyacrylate, sodium acetate, calcium acetate, barium acetate, potassium acetate, sodium citrate, calcium citrate, barium citrate, sulfites, bisulfates, silicates, meta-aluminates, phosphates and mixtures thereof.

[0075] In a preferred embodiment of the present invention, the alkali salts are calcium carbonate, barium carbonate, sodium polyacrylate, calcium polyacrylate and barium polyacrylate.

[0076] The particle size of the alkali salt is not limited, but is preferably 0.05 μm to 50 μm, and more preferably 0.1 μm to 10 μm.

[0077] Examples of calcium carbonate include calcite (calcite), aragonite (aragonite), natural calcium carbonate (ground calcium carbonate), and synthetic calcium carbonate (precipitated calcium carbonate). Among these, calcite and aragonite are preferred.

[0078] Surprisingly, it has been found that alkali salts significantly contribute to the thermal stability of polyamide compositions. Acidic or neutral salts do not affect the improvement of thermal stability. Some alkali salts are also used as inorganic fillers in polyamide compositions. However, the amount of alkali salt in the present invention must be controlled within a specific range, because if it exceeds 4.5%, the effect of thermal stability is not apparent and the mechanical properties of the polyamide composition rapidly deteriorate.

[0079] The alkali salt in the present invention is preferably present in an amount of 0.1 to 4.5% by weight, more preferably 0.5 to 4% by weight, and most preferably 1 to 3% by weight, based on the total weight of the polyamide composition.

[0080] The polyamide composition of the present invention can contain 0 to 50% by weight of a filler, which can be a fibrous filler, a granular filler, or a plate-like filler.

[0081] The fibrous filler 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, crushed glass fiber, chopped glass fiber, carbon fiber, potassium titanate, and / or wollastonite.

[0082] 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.

[0083] The fibrous filler is preferably surface-treated with a silane coupling agent, such as a vinylsilane coupling agent, an acrylic silane coupling agent, an epoxy silane coupling agent, or an aminosilane coupling agent, preferably an aminosilane coupling agent. The silane coupling agent can be dispersed in a sizing agent. Examples of sizing agents include acrylic acid compounds, acrylic acid / maleic acid derivative-modified compounds, epoxy compounds, urethane compounds, urethane / maleic acid derivative-modified compounds, and urethane / amine-modified compounds.

[0084] The fibrous filler in the polyamide composition preferably has an average length of 2 to 500 μm, preferably 200 to 300 μm, more preferably 220 to 240 μm. The cross-sectional diameter or major axis of the fibrous filler is preferably 5 to 40 μm, preferably 10 to 25 μm.

[0085] Alternatively, the filler is used in the form of particles. The particulate filler may have a variety of particle sizes, from dust-like particles to coarse particles. The particulate filler used may include organic or inorganic particles. Examples that can be used include inorganic particles such as kaolin, chalk, wollastonite, talc, silicates, graphite, mica, vermiculite, montmorillonite, and glass particles (e.g., glass beads).

[0086] The amount of the filler in the present invention is preferably 10 to 50% by weight, more preferably 10 to 30% by weight, and most preferably 10 to 20% by weight, based on the total weight of the polyamide composition.

[0087] The polyamide composition of the present invention may optionally comprise at least one additive (F), such as a lubricant, an antioxidant, a mold release agent, an impact modifier, a compatibilizer, a light stabilizer, e.g., a UV stabilizer, a plasticizer, a surfactant, a nucleating agent, a coupling agent, an antimicrobial agent, an antistatic agent, and any combination thereof.

[0088] For purposes of the present invention, additives can be used in conventional amounts, for example, the polyamide composition can include at least one additive in an amount of 0.01 to 10 wt. %, based on the total weight of the polyamide composition.

[0089] The polyamide composition may contain, for example, an antioxidant. Suitable antioxidants are aromatic amine antioxidants, hindered phenol antioxidants, and phosphite antioxidants, particularly hindered phenol antioxidants. Examples of the hindered phenolic antioxidant include, but are not limited to, α-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]-ω-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropoxy]poly(oxy-1,2-ethanediyl), 2,4-bis[(octylthio)methyl]-o-cresol, octyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate, 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid C7-C9 branched alkyl ester, 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-thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-1,6-hexanediylbis[3,5-bis(1,1-dimethylethyl)-4-hydroxy-benzenepropanamide.

[0090] When present, the antioxidant may be in an amount of 0.01 to 1 wt %, or 0.1 to 0.5 wt %, based on the total weight of the polyamide composition.

[0091] The polyamide composition may contain, for example, a lubricant. Suitable lubricants are preferably esters or amides of saturated or unsaturated aliphatic carboxylic acids having 10 to 40, preferably 16 to 22, carbon atoms with saturated aliphatic alcohols or amines having 2 to 40, preferably 2 to 6, carbon atoms. The carboxylic acids may be monobasic or dibasic. Examples of carboxylic acids include pelargonic acid, palmitic acid, lauric acid, margaric acid, dodecanedioic acid, and behenic acid, with stearic acid, capric acid, and even montanic acid (a mixture of fatty acids having 30 to 40 carbon atoms). The fatty alcohols may be monohydric to tetrahydric. Examples of fatty alcohols include n-butanol, n-octanol, stearyl alcohol, ethylene glycol, propylene glycol, neopentyl glycol, and pentaerythritol, with glycerol and pentaerythritol being preferred. The fatty amines may be monofunctional to trifunctional. Examples of aliphatic amines are stearylamine, ethylenediamine, propylenediamine, hexamethylenediamine and di(6-aminohexyl)amine, with ethylenediamine and hexamethylenediamine being particularly preferred.

[0092] Preferred esters or amides are N,N'-ethylenedi(stearamide), glycerol distearate, glycerol tristearate, glycerol monopalmitate, glycerol trilaurate, glycerol monobehenate, and pentaerythritol tetrastearate. N,N'-ethylenedi(stearamide) is particularly preferred as a lubricant in the polyamide composition according to the invention.

[0093] It is also possible to use mixtures of different esters or amides, or combinations of esters with amides in any desired mixing ratio.

[0094] Other lubricants are preferably long-chain fatty acids (e.g., stearic acid or behenic acid), salts thereof (e.g., calcium stearate or zinc stearate), or montan wax (a mixture of linear saturated carboxylic acids with a chain length of 28 to 32 carbon atoms), calcium montanate or sodium montanate, and also low molecular weight polyethylene waxes and low molecular weight polypropylene waxes.

[0095] When present, the lubricant may be in an amount of 0.01 to 2 wt %, or 0.2 to 1 wt %, based on the total weight of the polyamide composition.

[0096] The polyamide composition may contain, for example, an impact modifier. Suitable impact modifiers may include polyolefin-based, styrenic-based, and unsaturated carboxylic acid-based impact modifiers. Suitable impact modifiers may also be modified with functional blocks such as epoxy-functional blocks and / or acid anhydride blocks. The epoxy-functional blocks may be units derived from glycidyl (meth)acrylate. The acid anhydride blocks may be units derived from maleic anhydride.

[0097] Suitable polyolefin impact modifiers can include polyolefins containing repeating units derived from olefins having from 2 to 10 carbon atoms. Examples of such olefins include ethylene, 1-butene, 1-propylene, 1-pentene, 1-octene, and mixtures of ethylene and 1-octene, preferably ethylene, 1-propylene, and mixtures of ethylene and 1-octene.

[0098] Suitable unsaturated carboxylic acid impact modifiers may include blocks derived from carboxylic acids and their derivatives, such as esters, imides, and amides. Suitable carboxylic acids and their derivatives include, for example, acrylic acid, methacrylic acid, maleic acid, fumaric acid, glutaconic acid, itaconic acid, citraconic acid, (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (methyl)acrylate, and isobutyl (meth)acrylate.

[0099] The impact modifier may also be a bipolymer or terpolymer or a core-shell structured polymer. Examples of such impact modifiers include styrene / ethylene / butylene copolymer (SEBS), ethylene-methyl acrylate-glycidyl methacrylate terpolymer, ethylene / propylene / diene rubber (EPDM), and ethylene-octene copolymer.

[0100] When present, the impact modifier may be in an amount of 0.01 to 15 wt. %, or 1 to 15 wt. %, or 5 to 10 wt. %, based on the total weight of the polyamide composition.

[0101] The polyamide composition may include plasticizers, including, for example, but not limited to, dioctyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, hydrocarbon oils, and N-(n-butyl)benzenesulfonamide.

[0102] When present, the plasticizer may be in an amount of 0.01 to 15 wt. %, or 1 to 15 wt. %, or 5 to 10 wt. %, based on the total weight of the polyamide composition.

[0103] In a particular embodiment according to the present invention, the polyamide composition comprises: 30 to 97 wt. % of (A) at least one semi-crystalline, semi-aromatic polyamide; 2 to 50% by weight of (B) at least one white pigment selected from the group consisting of titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, titanium hydroxide, zinc hydroxide, magnesium hydroxide, zirconium hydroxide, zinc sulfate, calcium sulfate, zinc sulfide, aluminum phosphate, magnesium carbonate, and mixtures thereof; 0.1 to 2 wt. % of (C) at least a phosphorus-containing heat stabilizer; 0.1 to 4.5% by weight of (D) at least one alkali salt having a pH higher than 7, and optionally, 0 to 50% by weight of (E) at least one filler Includes:

[0104] In another preferred embodiment, the polyamide composition comprises: 30 to 97% by weight (A) of at least one semi-crystalline, semi-aromatic polyamide; 2 to 50% by weight of (B) at least one white pigment selected from the group consisting of titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, titanium hydroxide, zinc hydroxide, magnesium hydroxide, zirconium hydroxide, zinc sulfate, calcium sulfate, zinc sulfide, aluminum phosphate, magnesium carbonate, and mixtures thereof; 0.1 to 2 wt. % of (C) at least a phosphorus-containing heat stabilizer selected from the group consisting of organic phosphinates, inorganic hypophosphites, organic phosphonates, inorganic phosphonates, organic phosphites, and mixtures thereof; 0.1 to 4.5% by weight of (D) at least one alkali salt having a pH greater than 7 selected from calcium carbonate, strontium carbonate, barium carbonate, sodium acrylate, calcium acrylate, potassium acrylate, sodium polyacrylate, calcium polyacrylate, potassium polyacrylate, sodium acetate, calcium acetate, barium acetate, potassium acetate, sodium citrate, calcium citrate, barium citrate, sulfites, hydrogen sulfates, silicates, meta-aluminates, phosphates, and mixtures thereof, and optionally 0 to 50% by weight of (E) at least one filler Includes:

[0105] In another preferred embodiment, the polyamide composition comprises: 30 to 97 wt. % of (A) at least one semi-crystalline, semi-aromatic polyamide, 2 to 50% by weight of (B) at least one white pigment selected from the group consisting of titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, and mixtures thereof; 0.1 to 2 wt. % of (C) an at least phosphorus-containing heat stabilizer which is an organic phosphinate and / or an organic phosphonate; 0.1 to 4.5% by weight of (D) at least one alkali salt having a pH greater than 7 selected from calcium carbonate, strontium carbonate, barium carbonate, sodium polyacrylate, calcium polyacrylate, potassium polyacrylate, and mixtures thereof, and optionally, 0 to 50% by weight of (E) at least one filler Includes:

[0106] In another preferred embodiment, the polyamide composition comprises: 47 to 67 wt. % of (A) at least one semi-crystalline, semi-aromatic polyamide; 30 to 50% by weight of (B) at least one white pigment selected from the group consisting of titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, and mixtures thereof; 0.5 to 1 wt. % of (C) an at least phosphorus-containing heat stabilizer which is an organic phosphinate and / or organic phosphonate; 0.5 to 2% by weight of (D) at least one alkali salt having a pH greater than 7 selected from calcium carbonate, strontium carbonate, barium carbonate, sodium polyacrylate, calcium polyacrylate, potassium polyacrylate, and mixtures thereof, and optionally, 0 to 50% by weight of (E) at least one filler Includes:

[0107] The polyamide compositions of the present invention can be processed by conventional methods into various structures or forms to provide articles. For example, the individual components of the polyamide compositions of the present invention can be mixed and then shaped to form articles by injection and / or extrusion in conventional mixing equipment, such as a screw extruder, a Brabender mixer, or a Banbury mixer. The mixing temperature used herein is generally between 220°C and 260°C.

[0108] It will be appreciated that all components of the polyamide composition can be mixed simultaneously. Alternatively, some components of the polyamide composition can be premixed and then mixed with other components. For example, all starting components of the polyamide composition except for the white pigment and filler can be mixed together in a mixer and fed into the throat of a twin-screw extruder, with the white pigment and filler then premixed and fed downstream using a side feeder.

[0109] Thus, the present invention provides LED components made from polyamide compositions, which can be manufactured or assembled by a reflow soldering process.

[0110] The LED component is a part of the light-emitting diode reflector. The light-emitting diode device is an assembly comprising at least one light-emitting semiconductor diode, a current source, and a housing covering the diode or a plate in which the diode is embedded. The LED component can be the housing or plate of the light-emitting diode device. The housing or plate can be made entirely or partially from the polyamide composition of the present invention. For example, one of the walls of the housing is made from the polyamide composition.

[0111] The LED components in the present invention can be used in automotive lighting, mobile communication devices, and home applications. Lighting elements include automotive instrument panel displays, automotive screens, turn signals, stop lights, interior and exterior lights, floodlights, and floor lamps. Mobile electronic device elements include mobile phone displays, laptops, notebooks, e-readers, tablet computers, pocket calculators, portable media players, mobile internet devices (MIDs), handheld PCs, handheld game consoles, digital media players, wearable computers such as smart watches, head-mounted displays, virtual reality headsets, digital cameras, global positioning system receivers, portable power sources, and portable Wi-Fi. Home application elements include television backlights, liquid crystal displays, computer displays, laptop displays, notebook displays, and displays for home applications such as air conditioners, intelligent housing systems, mopping robots, electric cookers, rice cookers, ovens, microwave ovens, washing machines, and dishwashers.

[0112] The present invention therefore provides an article made from a polyamide composition according to the present invention.

[0113] Preferably, an article according to the invention has one or more of the following properties: - Tensile stress at break of more than 41 MPa measured according to ISO 527-1-2012 - Tensile strain at break greater than 100% measured according to ISO 527-1-2012 - Tensile modulus greater than 4450 MPa measured according to ISO 527-1-2012 - At least 1.8 KJ / m at 23°C measured according to ISO 179-1-2010 2 Charpy notched impact strength - At least 15 KJ / m at 23°C measured according to ISO 179-1-2010 2 Charpy unnotched impact strength - Heat distortion temperature above 242°C measured under 0.45 MPa according to ISO 75-2-2013, Method A - 88cm, measured at 325°C and 2.16kg load according to ISO 1133 3 / MVR over 10 minutes -Over 96.1% original reflectance measured at a wavelength of 460nm Less than 4.4% reflectance loss measured at 460 nm wavelength after 500 hours aging at -120°C Less than 25.9% loss in reflectance measured at 460 nm wavelength after aging at -260°C for 30 minutes

[0114] The reflectivity of the polyamide composition is well maintained, especially after heat aging at 260°C for 30 minutes, which allows the polyamide composition to be used in a reflow soldering process and meet the application requirements of LED compounds. [Example]

[0115] The following examples further illustrate aspects of the present invention and are provided to illustrate certain aspects of the invention and should not be construed as limiting thereof.

[0116] The following materials and test methods were used in the examples.

[0117] material: [Table 1]

[0118] measurement: 1. The tensile stress at break, tensile strain at break, and tensile modulus of 4 mm thick samples were measured in accordance with ISO 527-1-2012. Type 1 test specimens as specified in ISO 527-1-2012 were used. Charpy notched impact strength and Charpy unnotched impact strength were measured by edgewise impact in accordance with ISO 179-1-2010. The test specimens for the Charpy unnotched test were Type 1 test specimens with dimensions of 80 x 10 x 4 mm (length x width x thickness). The test specimens for the Charpy notched test were Type 1 notched specimens with Type A. All test specimens were conditioned for 16 hours at 23°C and 50% relative humidity. Testing was performed in the same atmosphere as the conditioning.

[0119] 2. Heat distortion temperature (HDT) was tested under 0.45 MPa in accordance with Method A of ISO75-2-2013.

[0120] 3. Melt volume flow rate (MVR) was tested according to ISO1133 at 325°C and a load of 2.16 kg.

[0121] 4. Reflectance-related tests were measured according to CIE 1976 using molded plastic plaque (60 x 60 x 2 mm) samples with a Datacolor DC850 spectrophotometer in D65 illuminant reflectance mode at a wavelength of 460 nm.

[0122] The test specimens used are made according to the following general procedure for preparing test specimens.

[0123] General specimen preparation procedure Test specimens were prepared according to the formulation shown in Table 2. All raw materials except titanium dioxide (B) were mixed together in a Turbula T50A high-speed mixer and fed into a ZE25Ax (Berstorff) twin-screw extruder at the throat, with titanium dioxide being fed downstream using a side feeder to maintain good mechanical properties. The raw materials were melt-extruded at a temperature of 320°C and pelletized to obtain a pelletized polyamide composition.

[0124] Sample preparation and testing: The dried pellets were processed in an injection molding machine KM130CX from Krauss Maffei at a clamping force of 130 T, a melt temperature of 320° C. and a mold temperature of 120° C. to obtain test specimens.

[0125] The above properties were measured for the obtained test specimens. The test results and the formulations for preparing the test specimens are summarized in Table 2.

[0126] Table 2 shows that Examples E1 to E6 of the present invention use a combination of a phosphorus-containing heat stabilizer and an alkali salt. The original reflectance of E1 to E6 is higher than that of Comparative Examples C1 to C3, and the reflectance loss of E1 to E6 after aging at 120°C for 500 hours and aging at 260°C for 30 minutes is significantly lower than that of C1 to C2, whose reflectance loss after aging at 260°C for 30 minutes is more than 35%.

[0127] It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope and spirit of the invention. It is intended that the embodiments and examples be considered merely as illustrative. Thus, it is intended that the present invention cover such modifications and variations as come within the scope of the appended claims and their equivalents.

[0128] [Table 2]

Claims

1. 1. A polyamide composition for preparing an LED component, comprising, based on the total weight of the polyamide composition, 30 to 97 wt. % of (A) at least one semi-crystalline, semi-aromatic polyamide; 2 to 50 wt. % of (B) at least one white pigment; 0.1 to 2 wt. % of (C) at least a phosphorus-containing heat stabilizer; 0.1 to 4.5 wt. % of (D) at least one alkali salt having a pH greater than 7; and optionally 0 to 50 wt. % of (E) at least one filler.

2. the semicrystalline semi-aromatic polyamide comprises dicarboxylic acid units and diamine units, and 0 to 20 mol % of units derived from an amino acid and / or a lactam, based on the total number of moles of units constituting the semicrystalline semi-aromatic polyamide; i. the dicarboxylic acid units are derived from an aromatic dicarboxylic acid and / or an aromatic dicarboxylic acid chloride (a-1), or a combination of the aromatic dicarboxylic acid and / or the aromatic dicarboxylic acid chloride (a-1) with another dicarboxylic acid (a-2) including an aliphatic dicarboxylic acid and / or an alicyclic dicarboxylic acid, and the aromatic dicarboxylic acid and / or the aromatic dicarboxylic acid chloride (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 % based on the total moles of the dicarboxylic acid units constituting the semi-crystalline semi-aromatic polyamide; the diamine units are derived from an aliphatic diamine (b-1) or a combination of an aliphatic diamine (b-1) and an aromatic diamine (b-2), and 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 % based on the total moles of the diamine units constituting the semi-crystalline, semi-aromatic polyamide; or ii. The dicarboxylic acid units are derived from an aliphatic dicarboxylic acid or a combination of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid, and the aliphatic dicarboxylic acid is present in an amount of 80 to 100 mol % and the alicyclic dicarboxylic acid is present in an amount of 0 to 20 mol % based on the total moles of the dicarboxylic acid units constituting the semi-crystalline, semi-aromatic polyamide; the diamine units are derived from an aromatic diamine or a combination of an aromatic diamine and an aliphatic diamine, and the aromatic diamine is present in an amount of 80 to 100 mol % and the aliphatic diamine is present in an amount of 0 to 20 mol % based on the total moles of the diamine units constituting the semi-crystalline semi-aromatic polyamide; The polyamide composition of claim 1.

3. The semi-crystalline semi-aromatic polyamide is PAMXD6, PAPXD6, PAMXD9, PAPXD9, PAMXD10, PAPXD10, PA4T / 4I , PA4T / 6I, PA5T / 5I, PA6T, PA6T / 6I, PA6T / 8T, PA6T / 10T, PA6T / 10I, PA9T, PA10T, P A12T, PA10T / 10I, PA6T / 9T, PA6T / 12T, PA4T / 6T / DT, PA4T / 10T / DT, PA4T / 4I / 6T / 6I / DT / DI, PA6T / 12T / 6I / 12I, PA6T / 10T / 6I, PA4T / 6T / 4I / 6I, PA5T / 6T / 5I / 6I, PA5T / 4 3. The polyamide composition of claim 1, wherein the polyamide is selected from the group consisting of PA4T / 5I / 4I, PA4T / 10T / 5I / 10I, PA4T / 6T / DT, PA4T / 10T / DT, or PA4T / 4I / 6T / 6I / DT / DI, PA6T / 6, PA6T / 12, 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, PA10T / 12, PA10T / 11, and PA6T / 6I / 12.

4. 4. The polyamide composition according to any one of claims 1 to 3, wherein the white pigment is selected from the group consisting of titanium oxide, zinc oxide, zirconium oxide, tin oxide, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, antimony oxide, titanium hydroxide, zinc hydroxide, magnesium hydroxide, zirconium hydroxide, zinc sulfate, calcium sulfate, zinc sulfide, aluminum phosphate, magnesium carbonate and mixtures thereof, preferably titanium oxide.

5. 5. The polyamide composition according to claim 1, wherein the phosphorus-containing heat stabilizer is selected from the group comprising organic phosphinates, inorganic hypophosphites, organic phosphonates, inorganic phosphonates, organic phosphorous acids and mixtures thereof, with organic phosphonates and organic phosphinates being preferred.

6. The organic phosphonate is selected from the group consisting of sodium phosphonate, disodium phosphonate, potassium phosphonate, sodium phenylphosphonate, potassium phenylphosphonate, lithium phenylphosphonate, sodium ethylphosphonate, potassium ethylphosphonate, and ammonium phosphonate, and the organic phosphinate is of formula I 【Chemistry 1】 (Wherein, Ar is C ６ ~C １８ aryl, X is a metal cation selected from Na, Ca, Mg, Al or Zn, C ６ ~C １８ The aryl is unsubstituted or C １ ~C １０ Alkyl, C ３ ~C １０ Cycloalkyl, C １ ~C １０ Alkoxy, C ３ ~C １０ Cycloalkoxy, C １ ~C １０ Alkylthio, C ３ ~C １０ Cycloalkylthio, C １ ~C １０ Alkylamino, C ３ ~C １０ Cycloalkylamines, C ６ ~C １８ Aryl, C ６ ~C １８ Aryloxy, C ６ ~C １８ Arylthio, C ６ ~C １８ 6. The polyamide composition of claim 5, wherein the metal salt has a substituent selected from the group consisting of arylamino, halogen, and combinations thereof.

7. 7. The polyamide composition according to claim 5 or 6, wherein the phosphorus-containing heat stabilizer is sodium benzenephosphinate, sodium phosphonate and / or potassium phosphonate.

8. 8. The polyamide composition of any one of claims 1 to 7, wherein the alkali salt is selected from the group consisting of calcium carbonate, strontium carbonate, barium carbonate, sodium acrylate, calcium acrylate, potassium acrylate, sodium polyacrylate, calcium polyacrylate, potassium polyacrylate, sodium acetate, calcium acetate, barium acetate, potassium acetate, sodium citrate, calcium citrate, barium citrate, and mixtures thereof.

9. 9. The polyamide composition of claim 8, wherein the alkali salts are barium carbonate, sodium polyacrylate, calcium polyacrylate and barium polyacrylate.

10. 9. The polyamide composition of claim 8, wherein the alkali salt is calcium carbonate.

11. 11. The polyamide composition according to claim 1, further comprising a lubricant, an antioxidant and / or a light stabilizer.

12. 12. The polyamide composition according to any one of claims 1 to 11, comprising, based on the total weight of the polyamide composition, 45 to 80% by weight of component (A), 20 to 40% by weight of component (B), 0.1 to 2% by weight of component (C), and 0.5 to 4% by weight of component (D).

13. 13. An LED component made from the polyamide composition of any one of claims 1 to 12.

14. 14. The LED component according to claim 13, which is a housing or plate of a light emitting diode device.

15. 15. The LED component according to claim 13 or 14, which is an element of an automotive instrument panel display, an automotive screen, a turn signal light, a stop light, an interior or exterior light, a flood light, a floor lamp, a mobile phone display, a laptop, a notebook, an e-reader, a tablet computer, a pocket calculator, a portable media player, a mobile internet device, a handheld PC, a handheld game console, a digital media player, a wearable computer, a head mounted display, a virtual reality headset, a digital camera, a global positioning system receiver, a portable power source, a portable Wi-Fi, a backlight for a TV, a liquid crystal display, a computer display, a laptop display or a notebook display, a display for home use.

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