Polyester compositions and corresponding articles

Abstract

Semi-aromatic semi-crystalline polyester, polyolefin, and low D k and low D f Glass fiber with low D k / D f Described herein is a polyester composition comprising a semi-crystalline polyester and a polyolefin. The concentration of the semi-crystalline polyester and the polyolefin is selected so that the polyester weight ratio is 70% to 95%. When the polyester weight ratio is within the aforementioned range, the polyester composition exhibits excellent dielectric properties (D k and D f It has been surprisingly found that the polyester composition has an excellent balance of high D and mechanical properties (e.g., notched impact strength). k / D f It has also been surprisingly discovered that when glass fibers are further included, the balance between dielectric and mechanical properties is further improved when the polyester weight ratio is between 75% and 93%.Due, at least in part, to the excellent balance between dielectric and mechanical properties, the polyester composition may be desirably incorporated into portable electronic device components.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 62 / 986837, filed March 9, 2020, and European Patent Application No. 20178769.4, filed June 8, 2020, the entire contents of each of which are incorporated herein by reference for all purposes.

[0002] The present invention relates to a polymeric composition comprising a semi-aromatic semi-crystalline polyester, a polyolefin, and a low D k / D f The present invention relates to a polyester composition comprising a glass fiber and having an excellent balance of dielectric and mechanical properties. The present invention also relates to articles, such as portable electronic device components, that incorporate the polyester composition. [Background technology]

[0003] The proliferation of 5G communications has created a continuing need for polymeric materials that can be desirably incorporated into applications, including portable electronic device components. More specifically, portable electronic devices require a good balance of mechanical strength and dielectric performance. For the former, portable electronic devices are routinely subject to drops and bumps and are exposed to large temperature changes during use. For this reason, the incorporated polymeric materials must have good mechanical performance. At the same time, the polymeric materials must have good dielectric performance (low D) so that the materials do not adversely interfere with 5G communications to and from portable electronic devices. k and D f ) must be present. Summary of the Invention

[0004] In one aspect, the present invention provides a semi-aromatic, semi-crystalline polyester comprising a repeating unit (R PO ) at least 50 mol % of repeating units (R PO), wherein the mole percent is based on the total number of repeat units in the polyolefin, and PO ) is the following formula: [ka] (wherein R5 to R8 are hydrogen and C1 to C 10 and a polyolefin represented by the formula (I) (independently selected from the group consisting of alkyl groups). The polyester composition has a D of 5.5 or less when measured according to ASTM D150 at 1 MHz. k and D of 0.002 or less f and a polyester weight ratio of 70% to 95%. The polyester weight ratio is represented by the formula:

number

[0005] In some embodiments, the semi-aromatic, semi-crystalline polyester is selected from the group consisting of polycyclohexylene dimethylene terephthalate ("PCT"), polyethylene terephthalate ("PET"), polybutylene terephthalate ("PBT"), polyethylene naphthalate ("PEN"), and polybutylene naphthalate ("PBN"). Additionally or alternatively, in some embodiments, the polyolefin is selected from the group consisting of poly(4-methyl-1-pentene), poly(1-butene), poly(1-pentene), and poly(1-hexene), preferably, the polyolefin is poly(4-methyl-1-pentene).

[0006] In some embodiments, the polyester composition has a high D k / D f Additionally or alternatively, in some embodiments, the polyester weight ratio is between 75% and 93%.

[0007] In some embodiments, the polyester composition has a D of 3.5 or less when measured according to ASTM D150 at 1 kHz. k and D of 0.003 or less f Additionally or alternatively, in some embodiments, the polyester composition has a D of 3.4 or less when measured according to ASTM D150 at 1 MHz. k and D of 0.03 or less f Includes:

[0008] In some embodiments, the polyester composition comprises a notched impact strength of at least 80 J / m as measured according to ASTM D256.

[0009] In another aspect, the present invention relates to a portable electronic device component comprising the polyester composition. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a graph showing plots of normalized notched impact strength as a function of PE weight ratio for (A) a polyester composition containing no glass fibers, (B) a polyester composition containing low Dk / Df glass fibers as the only glass fibers, and (C) a polyester composition containing a blend of low Dk / Df and high Dk / Df glass fibers. DETAILED DESCRIPTION OF THE INVENTION

[0011] Semi-aromatic semi-crystalline polyesters, polyolefins, and low dielectric constant (D k ") and glass fiber with low dielectric tangent ("D f ”)(“Low D k / D fDescribed herein are polyester compositions comprising semi-crystalline polyester and polyolefin ("glass fiber"). The concentrations of the semi-crystalline polyester and polyolefin are selected so that the polyester weight ratio (weight of polyester in the composition relative to the total weight of polyester and polyolefin in the composition) is 70% to 95%. When the polyester weight ratio is within the aforementioned range, the polyester composition exhibits excellent dielectric properties (D k and D f It has been surprisingly found that the polyester composition has an excellent balance of high D and mechanical properties (e.g., notched impact strength). k / D f It has also been surprisingly discovered that when glass fibers are further included, the balance between dielectric and mechanical properties is further improved when the polyester weight ratio is between 75% and 93%.Due, at least in part, to the excellent balance between dielectric and mechanical properties, the polyester composition may be desirably incorporated into portable electronic device components.

[0012] Unless specifically limited otherwise, the terms "alkyl," and derivative terms such as "alkoxy," "acyl," and "alkylthio," as used herein, include within their scope linear, branched, and cyclic moieties. Examples of alkyl groups are methyl, ethyl, 1-methylethyl, propyl, 1,1-dimethylethyl, and cyclopropyl. Unless specifically stated otherwise, each alkyl and aryl group may be unsubstituted or substituted with halogen, hydroxy, sulfo, C1-C6 alkoxy, C1-C6 alkylthio, C1-C6 acyl, formyl, cyano, C6-C6 alkyl, or aryl. 15 Aryloxy or C6-C 15 and aryl, provided that the substituents are sterically compatible and chemical bonding and strain energy rules are met. The term "halogen" or "halo" includes fluorine, chlorine, bromine, and iodine, with fluorine being preferred.

[0013] The term "aryl" refers to a phenyl, indanyl, or naphthyl group. An aryl group can contain one or more alkyl groups, in which case it is sometimes referred to as an "alkylaryl," and can be composed, for example, of an aromatic group and two C1-C6 groups (e.g., methyl or ethyl). An aryl group can also contain one or more heteroatoms, such as N, O, or S, in which case it is sometimes referred to as a "heteroaryl" group, and these heteroaromatic rings can be fused with other aromatic systems. Such heteroaromatic rings include, but are not limited to, furanyl, thienyl, pyrrolyl, pyrazolyl, imidazolyl, triazolyl, isoxazolyl, oxazolyl, thiazolyl, isothiazolyl, pyridyl, pyridazyl, pyrimidyl, pyrazinyl, and triazinyl ring structures. An aryl or heteroaryl substituent can be unsubstituted or can be selected from the group consisting of halogen, hydroxy, C1-C6 alkoxy, sulfo, C1-C6 alkylthio, C1-C6 acyl, formyl, cyano, C6-C6 alkyl, and the like. 15 Aryloxy or C6-C 15 It may be substituted with one or more substituents selected from, but not limited to, aryl, provided that the substituents are sterically compatible and chemical bonding and strain energy rules are satisfied.

[0014] Polyester composition The polyester compositions described herein comprise a semi-aromatic semi-crystalline polyester, a polyolefin, and a low D k / D f and glass fibers. In some embodiments, the polyester composition may include additional components. As described above, it has been surprisingly discovered that when the polyester weight ratio is between 70% and 95%, the polyester composition has an excellent balance of dielectric and mechanical properties. The polyester weight ratio is determined by the following formula:

number

[0015] As described above, the polyester composition has a high D k / D f It has also been surprisingly found that when glass fibers are further included, the balance between dielectric and mechanical properties is further improved when the polyester weight ratio is between 75% and 93%. k / D f In some embodiments including glass fibers, the polyester composition has a polyester weight ratio of at least 75%, or at least 77%, or at least 80%, or at least 82%. k / D f In some embodiments including glass fibers, the polyester composition has a polyester weight ratio of 93% or less, or 90% or less. k / D f In some embodiments including glass fibers, the polyester composition has a polyester weight ratio of 75% to 93%, or 77% to 93%, or 80% to 93%, or 82% to 93%, or 75% to 90%, or 77% to 90%, or 80% to 90%, or 82% to 90%.

[0016] For dielectric performance, in some embodiments, the polyester composition has a D @ 1 kHz of 3.5 or less, or 3.4 or less. k In some embodiments, the polyester composition has a D of at least 2.8, or at least 2.9, or at least 3.0. kIn some embodiments, the polyester composition has a D at 1 kHz of 2.8 to 3.5, or 2.9 to 3.5, or 3.0 to 3.5, or 2.8 to 3.4, or 2.9 to 3.4, or 3.0 to 3.4. k In some embodiments, the polyester composition has a D at 1 MHz of 3.4 or less, or 3.3 or less. k In some embodiments, the polyester composition has a D at 1 MHz of at least 2.8, or at least 2.9, or at least 3.0. k In some embodiments, the polyester composition has a D @ 1 MHz of 2.8 to 3.4, or 2.9 to 3.4, or 3.0 to 3.4, or 2.8 to 3.3, or 2.9 to 3.3, or 3.0 to 3.3. k In some embodiments, the polyester composition has a D at both 1 kHz and 1 MHz within each of the above ranges. k D at 1kHz and 1MHz k can be measured according to ASTM D150.

[0017] In some embodiments, the polyester composition has a D at 1 kHz of 0.003 or less, or 0.002 or less. f In some embodiments, the polyester composition has a D at 1 kHz of at least 0.0005, or at least 0.001, or at least 0.0014. f In some embodiments, the polyester composition has a D at 1 kHz of 0.0005 to 0.003, or 0.001 to 0.003, or 0.0014 to 0.003, or 0.0005 to 0.002, or 0.001 to 0.002, or 0.0014 to 0.002. f In some embodiments, the polyester composition has a D at 1 MHz of 0.03 or less, or 0.02 or less. f In some embodiments, the polyester composition has a D at 1 MHz of at least 0.001 or at least 0.005. fIn some embodiments, the polyester composition has a D at 1 MHz of 0.001 to 0.03, or 0.005 to 0.03, or 0.001 to 0.02, or 0.005 to 0.02. f In some embodiments, the polyester composition has a D at both 1 kHz and 1 MHz within each of the above ranges. f D at 1kHz and 1MHz f can be measured according to ASTM D150.

[0018] In some embodiments, the polyester composition has a D at 1.77 GHz of 3.5 or less, or 3.3 or less, or 3.25 or less. k In some embodiments, the polyester composition has a D at 1.77 GHz of 2.7 or greater, or 2.8 or greater, or 2.9 or greater. k In some embodiments, the polyester composition has a D at 1.77 GHz of 2.7 to 3.5, or 2.7 to 3.3, or 2.7 to 3.25, or 2.8 to 3.5, or 2.8 to 3.3, or 2.9 to 3.3, or 2.9 to 3.5, or 2.9 to 3.3, or 2.9 to 3.25. k In some embodiments, the polyester composition has a D at 1.77 GHz of 0.008 or less, or 0.007 or less, or 0.065 or less. f In some embodiments, the polyester composition has a D at 1.77 GHz of 0.003 or greater, or 0.004 or greater, or 0.0045 or greater. f In some embodiments, the polyester composition has a D at 1.77 GHz of 0.003 to 0.008, or 0.004 to 0.008, or 0.0045 to 0.008, or 0.003 to 0.007, or 0.004 to 0.007, or 0.0045 to 0.007, or 0.003 to 0.0065, or 0.004 to 0.0065, or 0.0045 to 0.0065. f D at 1.77GHz k and D f can be measured according to ASTM D2520.

[0019] In some embodiments, the polyester composition has a D at 2.45 GHz of 3.3 or less, or 3.2 or less, or 3.1 or less. k In some embodiments, the polyester composition has a D at 2.4 GHz of 2.6 or greater, or 2.7 or greater, or 2.8 or greater. k In some embodiments, the polyester composition has a D at 2.45 GHz of, or from 2.6 to 3.3, or from 2.7 to 3.3, or from 2.8 to 3.3, or from 2.6 to 3.2, or from 2.7 to 3.2, or from 2.8 to 3.3, or from 2.6 to 3.1, or from 2.7 to 3.1, or from 2.8 to 3.1. k In some embodiments, the polyester composition has a D at 2.45 GHz of 0.008 or less, or 0.007 or less, or 0.006 or less. f In some embodiments, the polyester composition has a D at 2.45 GHz of 0.003 or greater, or 0.004 or greater, or 0.0045 or greater. f In some embodiments, the polyester composition has a D at 2.45 GHz of 0.003 to 0.008, or 0.004 to 0.008, or 0.0045 to 0.008, or 0.003 to 0.007, or 0.004 to 0.007, or 0.0045 to 0.007, or 0.003 to 0.006, or 0.004 to 0.006, or 0.0045 to 0.006. f D at 2.45GHz k and D f can be measured according to ASTM D2520.

[0020] With respect to mechanical performance, in some embodiments, the polyester composition has a notched impact strength of at least 80 J / m, or at least 90 J / m, or at least 100 J / m, or at least 110 J / m. In some embodiments, the polyester composition has a notched impact strength of 140 J / m or less, or 130 J / m or less, or 120 J / m or less, or 115 J / m or less. In some embodiments, the polyester composition has a notched impact strength of 80 J / m to 140 J / m, or 90 J / m to 140 J / m, or 100 J / m to 140 J / m, or 110 J / m to 140 J / m, or 80 J / m to 130 J / m, or 90 J / m to 130 J / m, or 100 J / m to 130 J / m, or 110 J / m to 130 J / m, or 80 J / m to 120 J / m, or 90 J / m to 120 J / m, or 100 J / m to 120 J / m, or 110 J / m to 120 J / m, or 80 J / m to 115 J / m, or 90 J / m to 115 J / m, or 100 J / m to 115 J / m, or 110 J / m to 115 J / m, and Notched impact strength can be measured according to D256.

[0021] In some embodiments, the combined concentration of the semi-aromatic semi-crystalline polyester and polyolefin in the polyester composition is at least 55 weight percent ("wt. %), or at least 60 wt. %, or at least 65 wt. %, based on the total weight of the polyester composition. In some embodiments, the combined concentration of the semi-aromatic semi-crystalline polyester and polyolefin in the polyester composition is 85 wt. % or less, or 80 wt. % or less, or 75 wt. % or less. In some embodiments, the combined concentration of the semi-aromatic semi-crystalline polyester and polyolefin in the polyester composition is 55 wt. % to 85 wt. %, or 55 wt. % to 80 wt. %, or 55 wt. % to 75 wt. %, or 60 wt. % to 85 wt. %, or 60 wt. % to 80 wt. %, or 60 wt. % to 75 wt. %, or 65 wt. % to 85 wt. %, or 65 wt. % to 80 wt. %, or 65 wt. % to 75 wt. %. As used herein, wt. % refers to the total weight of the polyester composition, unless otherwise specified.

[0022] In some embodiments, the polyester composition comprises a semi-aromatic semi-crystalline polyester, a polyolefin, and a low D k / D f Glass fiber (or low D k / D f Glass fiber and high D k / D f and glass fibers). In such embodiments, the combined concentration of the aforementioned components is at least 95 wt.%, or at least 97 wt.%, or at least 98 wt.%, or at least 99 wt.%, or at least 99.5 wt.%, or at least 99.9 wt.%, based on the total weight of the polyester composition. In some embodiments, the polyester composition comprises one or more additional semi-aromatic semi-crystalline polyesters or one or more additional polyolefins. In some such embodiments, each additional semi-aromatic semi-crystalline polyester and each additional polyolefin are different, as described below. In one such embodiment, the polyester composition comprises a semi-aromatic semi-crystalline polyester and one or more additional semi-aromatic semi-crystalline polyesters; a polyolefin and one or more additional polyolefins; and a low-D k / D f Glass fiber (or low D k / D f Glass fiber and high D k / D f In such an embodiment, the polymeric composition essentially consists of a semi-aromatic semi-crystalline polyester, a polyolefin, and a low D k / D f Glass fiber (or low D k / D f Glass fiber and high D k / D f The total concentration of the polymer (and / or blend with glass fibers) is at least 95% by weight, or at least 97% by weight, or at least 98% by weight, or at least 99% by weight, or at least 99.5% by weight, or at least 99.9% by weight.

[0023] Semi-aromatic semi-crystalline polyester The polyester composition comprises a semi-aromatic, semi-crystalline polyester. As used herein, a "semi-aromatic" polyester is a polyester having repeating units R having at least one ester group (-C(O)O-) and at least one aryl group. PE Further, as used herein, a "semi-crystalline" polyester (or "semi-crystalline" polymer) refers to any polymer that has a heat of fusion ("ΔH") of at least 5 Joules per gram ("J / g") at a heating rate of 20°C / min. f ") (Amorphous polyesters (or polymers) have a ΔH of less than 5 J / g at a heating rate of 20°C / min. f ΔH f can be measured according to ASTM D3418. In some embodiments, the semi-aromatic semi-crystalline polyester comprises at least 60 mol%, or at least 70 mol%, or at least 80 mol%, or at least 90 mol%, or at least 95 mol%, or at least 99 mol%, or at least 99.9 mol% of repeat units R PE As used herein, unless otherwise specified, mole % is relative to the total number of repeat units in the specified polymer (e.g., semi-aromatic semi-crystalline polyester).

[0024] In some embodiments, the repeating unit (R PE ) is expressed as: [ka] (Wherein, T is C1 to C 18 wherein Ar is alkyl and Ar is aryl. Preferably, Ar is phenyl or naphthyl. More preferably, Ar is phenyl and the designated —COOH groups in formulas (1)-(3) are located in the meta (1,4-) positions of Ar. In some embodiments, R PE is the following formula: [ka] (wherein R1 to R4 are each independently selected from hydrogen and C1 to C 12alkyl, and q, n, and m are independently selected integers from 1 to 12. In some embodiments, R1-R4 are all hydrogen. In some embodiments, q is an integer from 3 to 10, preferably 3 to 5, and most preferably either 3 or 4. In some embodiments, n=m. Preferably, n and m are 1.

[0025] In some embodiments, the semi-aromatic semi-crystalline polyester is selected from the group consisting of polycyclohexylene dimethylene terephthalate ("PCT"), polyethylene terephthalate ("PET"), polybutylene terephthalate ("PBT"), polyethylene naphthalate ("PEN"), and polybutylene naphthalate ("PBN"). Preferably, the semi-aromatic semi-crystalline polyester is PBT or PEN.

[0026] Of course, in some embodiments, the semi-aromatic semi-crystalline polyester may be R PE In some such embodiments, the semi-aromatic semi-crystalline polyesters each have additional repeat units that are different from each other and from R PE one or more additional repeat units R* different from PE In one such embodiment, each repeat unit R* PE is represented by a formula selected from the group consisting of formulas (1) to (3). In some embodiments, the repeating unit R PE and one or more additional repeat units R* PE is at least 60 mol%, or at least 70 mol%, or at least 80 mol%, or at least 90 mol%, or at least 95 mol%, or at least 99 mol%, or at least 99.5 mol%, or 100 mol%, based on the total number of repeat units in the semi-aromatic semi-crystalline polyester.

[0027] In some embodiments, the semi-aromatic semi-crystalline polyester has an intrinsic viscosity of about 0.4 to about 2.0 deciliters per gram ("dl / g") when measured in a 60:40 phenol / tetrachloroethane mixture or similar solvent at about 30° C. Preferably, the semi-aromatic semi-crystalline polyester has an intrinsic viscosity of 0.5 to 1.4 dl / g. Intrinsic viscosity can be measured according to ASTM D5225.

[0028] In some embodiments, the semi-aromatic semi-crystalline polyester has a number average molecular weight ("Mn") of at least about 1,000 g / mol, or at least about 5,000 g / mol, or at least about 10,000 g / mol. In some embodiments, the semi-aromatic semi-crystalline polyester has an Mn of about 100,000 g / mol or less, or about 75,000 g / mol or less, or about 50,000 g / mol or less. In some embodiments, the semi-aromatic semi-crystalline polyester has an Mn of 1,000 g / mol to 50,000 g / mol, or 5,000 g / mol to 75,000 g / mol, or 10,000 g / mol to 50,000 g / mol. In some embodiments, the semi-aromatic semi-crystalline polyester has a weight average molecular weight ("Mw") of at least about 1,000 g / mol, or at least about 15,000 g / mol, or at least about 20,000 g / mol. In some embodiments, the semi-aromatic semi-crystalline polyester has a Mw of about 200,000 g / mol or less, or about 150,000 g / mol or less, or about 125,000 g / mol or less, or about 110,000 g / mol or less, or about 100,000 g / mol or less. In some embodiments, the semi-aromatic semi-crystalline polyester has a Mw of 1,000 g / mol to 200,000 g / mol, or 15,000 g / mol to 200,000 g / mol, or 20,000 g / mol to 200,000 g / mol, or 20,000 g / mol to 150,000 g / mol, or 20,000 g / mol to 125,000 g / mol, or 20,000 g / mol to 110,000 g / mol, or 20,000 g / mol to 100,000 g / mol. Mn and Mw can be determined by gel permeation chromatography (GPC) using ASTM D5296 with polystyrene standards.

[0029] In some embodiments, the semi-aromatic semi-crystalline polyester has a Tm of at least 210°C, preferably at least 220°C, more preferably at least 230°C, and most preferably at least 240°C. In some embodiments, the semi-aromatic semi-crystalline polyester has a Tm of at most 350°C, preferably at most 340°C, more preferably at most 330°C, and most preferably at most 320°C. In some embodiments, the semi-aromatic semi-crystalline polyester has a Tm of 210°C to 350°C, or 220°C to 340°C, or 230°C to 330°C, or 240°C to 320°C. In some embodiments, the semi-aromatic semi-crystalline polyester has a glass transition temperature ("Tg") of at least 60°C, or at least 70°C, or at least 80°C. In some embodiments, the semi-aromatic semi-crystalline polyester has a Tg of 180°C or less, or 160°C or less, or 140°C or less. In some embodiments, the semi-aromatic semi-crystalline polyester has a Tg of from 60°C to 180°C, or from 70°C to 160°C, or from 80°C to 140°C.

[0030] In some embodiments, the concentration of the semi-aromatic semi-crystalline polyester in the polyester composition is at least 30 wt%, or at least 35 wt%, or at least 40 wt%, or at least 45 wt%, based on the total weight of the polyester composition. In some embodiments, the concentration of the semi-aromatic semi-crystalline polyester in the polyester composition is 80 wt% or less, or 75 wt% or less, or 70 wt% or less, or 65 wt% or less. In some embodiments, the concentration of the semi-aromatic semi-crystalline polyester in the polyester composition is 30 wt% to 80 wt%, or 40 wt% to 75 wt%, or 45 wt% to 70 wt%, or 45 wt% to 65 wt%.

[0031] In some embodiments, the polyester composition comprises one or more additional semi-aromatic semi-crystalline polyesters, each different from the other and from the semi-aromatic semi-crystalline polyester. In some such embodiments, the total concentration of the semi-aromatic semi-crystalline polyesters is within the ranges given above for the semi-aromatic semi-crystalline polyesters. In alternative embodiments, the concentration of each semi-aromatic semi-crystalline polyester is within the ranges given above for the semi-aromatic semi-crystalline polyesters.

[0032] Polyolefin The polyester composition contains at least 4 carbon atoms and has the following formula: [ka] (wherein R5 to R8 are hydrogen and C1 to C 10 Repeating units R PO Preferably, the polyolefin has a repeating unit (R PO ) contains at least 5 carbon atoms. In some embodiments, the polyolefin comprises at least 50 mol%, or at least 60 mol%, or at least 70 mol%, or at least 80 mol%, or at least 90 mol%, or at least 95 mol%, or at least 99 mol%, or at least 99.5 mol% of repeat units (R PO ), where mole percent is based on the total number of repeat units in the polyolefin. In some embodiments, R6-R8 are all hydrogen. Of course, in such embodiments, R5 is a C5-C 10 It is an alkyl group.

[0033] Of course, in some embodiments, the polyolefin may be (R PO In some such embodiments, the polyolefins have additional repeat units that are different from each other and from (R PO ) and one or more additional repeat units R* different from PO In one such embodiment, each repeat unit R* POis expressed by equation (4).

[0034] In some embodiments, the polyolefin is selected from the group consisting of poly(4-methyl-1-pentene) (also known as polymethylpentene), poly(1-butene), poly(1-pentene), poly(1-hexene), and mixtures of any two or more thereof. Preferably, the polyolefin is poly(4-methyl-1-pentene).

[0035] In some embodiments, the polyolefin has a number average molecular weight of less than 1,000,000 g / mol, preferably less than 500,000 g / mol, and most preferably less than 200,000 g / mol. In some embodiments, the polyolefin has a weight average molecular weight of less than 2,000,000 g / mol, preferably less than 1,000,000 g / mol, and most preferably less than 300,000 g / mol. Number average molecular weight can be measured according to ASTM D5296.

[0036] In some embodiments, the polyolefin has a melt flow rate ("MFR") at 2.16 Kg at 260°C of 5 g / 10 min to 250 g / 10 min, or 10 g / 10 min to 200 g / 10 min, or 15 g / 10 min to 150 g / 10 min, or 20 g / 10 min to 100 g / 10 min, or 25 g / 10 min to 50 g / 10 min, or 30 g / 10 min to 40 g / 10 min. In some embodiments, the polyolefin has an MFR of at least 3 g / 10 min at 2.16 Kg or 5 Kg at 250°C. MFR can be measured according to ASTM D1238. In some embodiments, the polyolefin has a viscous melt flow at a temperature 30°C to 70°C above its melting point. The polyolefin has a homogeneous and continuous melt above its melting temperature. Polyolefins can be processed by injection molding at temperatures 30-80°C above their melting temperature.

[0037] In some embodiments, the polyolefin has a melting temperature ("Tm") of at least 170°C, or at least 180°C, or at least 190°C, or at least 200°C, or at least 210°C. In some embodiments, the polyolefin has a Tm of 270°C or less, or 260°C or less, or 250°C or less, or 240°C or less. In some embodiments, the polyolefin has a Tm of 170°C to 270°C, or 180°C to 260°C, or 190°C to 250°C, or 200°C to 240°C, or 210°C to 240°C. In some embodiments, the polyolefin has a glass transition temperature ("Tg") of at least 0°C, or at least 10°C, or at least 20°C, or at least 30°C, or at least 35°C, or at least 40°C. In some embodiments, the polyolefin has a Tg of 80°C or less, or 70°C or less, or 65°C or less, or 60°C or less. In some embodiments, the polyolefin has a Tg from 0° C. to 80° C., or from 10° C. to 70° C., or from 20° C. to 65° C., or from 30° C. to 60° C., or from 35° C. to 60° C., or from 40° C. to 60° C. Tm and Tg can be measured by differential scanning calorimetry ("DSC") according to ASTM D3418.

[0038] In some embodiments, the concentration of polyolefin in the polyester composition is at least 1 wt%, or at least 3 wt%, or at least 4 wt%, or at least 5 wt%, based on the total weight of the polyester composition. In some embodiments, the concentration of polyolefin in the polyester composition is 40 wt% or less, or 30 wt% or less, or 25 wt% or less, or 20 wt% or less, based on the total weight of the polyester composition. In some embodiments, the concentration of polyolefin in the polyester composition is 1 wt% to 40 wt%, or 3 wt% to 30 wt%, or 4 wt% to 25 wt%, or 5 wt% to 20 wt%.

[0039] In some embodiments, the polyester composition comprises one or more additional polyolefins, each different from each other and from the polyolefin. In some such embodiments, the total concentration of the polyolefins is within the ranges given above for the polyolefins. In alternative embodiments, the concentration of each polyolefin is within the ranges given above for the polyolefins.

[0040] Glass fiber The polyester composition has a low D k / D f In some embodiments, the high D k / D f The composition includes additional glass fibers, which are glass fibers. Generally, the glass fibers are silica-based glass compounds containing several metal oxides that can be adjusted to produce different types of glass. The primary oxide is silica in the form of silica sand, while other oxides, such as calcium, sodium, and aluminum, are incorporated to lower the melting temperature and prevent crystallization. The glass fibers can be added as endless fibers or chopped glass fibers. The glass fibers generally have an equivalent diameter of 5 to 20 μm, preferably 5 to 15 μm, and more preferably 5 to 10 μm. All glass fiber types, including A, C, D, E, M, R, S, and T glass fibers (described in Additives for Plastics Handbook, 2nd ed., John Murphy, chapter 5.2.3, pages 43-48), and any mixtures thereof, can be used.

[0041] E-, R-, S-, and T-glass fibers are well known in the art. They are described, inter alia, in Fiberglass and Glass Technology, Wallenberger, Frederick T.; Bingham, Paul A. (Eds.), 2010, XIV, chapter 5, pages 197-225. R-, S-, and T-glass fibers consist essentially of oxides of silicon, aluminum, and magnesium. In particular, they typically contain 62-75 wt. % SiO2, 16-28 wt. % Al2O3, and 5-14 wt. % MgO. On the other hand, R-, S-, and T-glass fibers contain less than 10 wt. % CaO.

[0042] In some embodiments, glass fibers (low D k / D f Glass fiber or high D k / D f The glass fibers (whether or not glass fibers) are high modulus glass fibers. High modulus glass fibers have a modulus of elasticity, measured in accordance with ASTM D2343, of at least 76 GPa, preferably at least 78 GPa, more preferably at least 80 GPa, and most preferably at least 82 GPa. Examples of high modulus glass fibers include, but are not limited to, S-, R-, and T-glass fibers. For example, commercially available high modulus glass fibers are S-1 and S-2 glass fibers from Taishan and AGY, respectively. In some embodiments, the glass fibers have a high modulus and low D k / D f It is glass fiber.

[0043] Glass fiber (low D k / D f Glass fiber or high D k / D fThe morphology of the glass fiber (whether it is a glass fiber or not) is not particularly limited. The glass fiber can have a circular cross-section ("circular glass fiber") or a non-circular cross-section ("flat glass fiber"). The cross-section is taken in a plane perpendicular to the length of the glass fiber. A non-circular cross-section has a major dimension corresponding to the longest dimension of the cross-section and a minor dimension perpendicular to both the major dimension and the length of the glass fiber. A non-circular cross-section can be, but is not limited to, oval, elliptical, or rectangular.

[0044] In some embodiments in which the glass fibers are flat glass fibers, the major dimension of the non-circular cross-section is preferably at least 15 μm, more preferably at least 20 μm, even more preferably at least 22 μm, and most preferably at least 25 μm, and / or preferably at most 40 μm, more preferably at most 35 μm, even more preferably at most 32 μm, and most preferably at most 30 μm. In some embodiments, the major dimension of the non-circular cross-section is in the range of 15 to 35 μm, preferably 20 to 30 μm, and more preferably 25 to 29 μm. In some embodiments in which the glass fibers are flat glass fibers, the minor dimension of the non-circular cross-section is preferably at least 4 μm, more preferably at least 5 μm, even more preferably at least 6 μm, and most preferably at least 7 μm, and / or preferably at most 25 μm, more preferably at most 20 μm, even more preferably at most 17 μm, and most preferably at most 15 μm. In some embodiments, the minor dimension of the non-circular cross-section is in the range of 5 to 20 μm, preferably 5 to 15 μm, and more preferably 7 to 11 μm. In some embodiments where the glass fibers are flat glass fibers, the flat glass fibers preferably have an aspect ratio of at least 2, more preferably at least 2.2, even more preferably at least 2.4, and most preferably at least 3, and / or preferably at most 8, more preferably at most 6, and even more preferably at most 4. In some embodiments, the flat glass fibers have an aspect ratio in the range of 2 to 6, preferably 2.2 to 4. The aspect ratio is defined as the ratio of the major dimension of the cross-section of a flat glass fiber to the minor dimension of the same cross-section. The aspect ratio can be measured according to ISO 1888.

[0045] In some embodiments where the glass fibers are round, the round glass fibers preferably have an aspect ratio of less than 2, more preferably less than 1.5, even more preferably less than 1.2, even more preferably less than 1.1, and most preferably less than 1.05. Of course, those skilled in the art will understand that, regardless of the morphology of the glass fiber (e.g., round or flat), by definition, the aspect ratio cannot be less than 1.

[0046] Low D in polyester composition k / D f The glass fibers have a Dk at 1 MHz of 5.5 or less, or 5.4 or less, or 5.3 or less, or 5.2 or less, or 5.1 or less, or 5.0 or less. Further, in some embodiments, the low D k / D f The glass fibers have a Dk at 1 MHz of at least 3.7, or at least 3.8, or at least 3.9, or at least 4.0. In some embodiments, the low D k / D f The glass fiber has a Dk at 1 MHz of 3.7 to 5.5, or 3.7 to 5.4, or 3.7 to 5.3, or 3.7 to 5.2, or 3.7 to 5.1, or 3.7 to 5.0, or 3.8 to 5.0, or 3.9 to 5.0, or 4.0 to 5.0. k / D f The glass fibers have a Df at 1 MHz of 0.002 or less, or 0.001 or less. Furthermore, in some embodiments, low D k / D f Glass fiber has a D of 0.0001 or more or 0.0005 or more f In some embodiments, the low D k / D f Glass fiber has a D of 0.0001 to 0.002 or 0.0005 to 0.001 f D at 1MHz k and D f can be measured according to ASTM D150.

[0047] In some embodiments, the low Dk / D f The concentration of glass fibers is at least 10 wt%, or at least 15 wt%, or at least 20 wt%, or at least 25 wt%, based on the total weight of the polyester composition. Additionally or alternatively, in some embodiments, the low D k / D f The concentration of glass fibers is 60 wt% or less, or 50 wt% or less, or 45 wt% or less, or 40 wt% or less, or 35 wt% or less, based on the total weight of the polyester composition. In some embodiments, the low D k / D f The concentration of the glass fiber is 10% by weight to 60% by weight, or 15% by weight to 50% by weight, or 15% by weight to 45% by weight, or 15% by weight to 40% by weight, or 20% by weight to 40% by weight, or 20% by weight to 35% by weight.

[0048] As noted above, in some embodiments, the polyester composition may contain additional high D k / D f Contains glass fiber. High D k / D f The glass fiber has a D at 1 MHz of greater than 5.0, or greater than 5.1, or greater than 5.2, or greater than 5.3, or greater than 5.4. k and a D at 1 MHz of greater than 0.001 or greater than 0.002. f The polyester composition has a high D k / D f In some embodiments containing glass fibers, the high D in the polyester composition k / D f The concentration of glass fibers is at least 0.4 wt%, or at least 0.5 wt%, or at least 1 wt%, or at least 2 wt%, based on the total weight of the polyester composition. In some embodiments, the high D k / D f The concentration of glass fibers is 10% by weight or less, or 5% by weight or less, or 4% by weight or less. In some embodiments, the high D k / D fThe concentration of the glass fiber is 0.4% by weight to 10% by weight, or 0.5% by weight to 10% by weight, or 1% by weight to 10% by weight, or 2% by weight to 10% by weight, or 0.4% by weight to 5% by weight, or 0.5% by weight to 5% by weight, or 1% by weight to 5% by weight, or 2% by weight to 5% by weight, or 0.4% by weight to 4% by weight, or 0.5% by weight to 4% by weight, or 1% by weight to 4% by weight, or 2% by weight to 4% by weight.

[0049] The polyester composition has low D k / D f Glass fiber and high D k / D f In some embodiments comprising glass fibers, the total concentration of glass fibers in the polyester composition is k / D f Within the ranges given above for glass fibers. In some embodiments, low D k / D f Glass fiber and high D k / D f The total concentration of each glass fiber independently k / D f Within the ranges given above for glass fibers.

[0050] Additional ingredients As noted above, in some embodiments, the polyester composition may contain additional components in addition to the semi-aromatic semi-crystalline polyester, such as polyolefins, low D k / D f Glass fiber and high D k / D f In some embodiments, each additional component may be selected from the group consisting of reinforcing agents, toughening agents, plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, heat stabilizers, light stabilizers, flame retardants, nucleating agents, and antioxidants.

[0051] As used herein with respect to reinforcing agents in additional components, the term does not include glass fibers. Reinforcing agents can be selected from fibrous reinforcing agents and particulate reinforcing agents. A fibrous reinforcing filler is considered herein to be a material having a length, width, and thickness where the average length is significantly greater than both the width and thickness. Generally, such materials have an aspect ratio, defined as the average ratio between the length and the largest of the width and thickness, of at least 5, at least 10, at least 20, or at least 50. In some embodiments, the fibrous reinforcing agent (e.g., carbon fiber) has an average length of 3 mm to 50 mm. In some such embodiments, the fibrous reinforcing agent has an average length of 3 mm to 10 mm, or 3 mm to 8 mm, or 3 mm to 6 mm, or 3 mm to 5 mm. In alternative embodiments, the fibrous reinforcing agent has an average length of 10 mm to 50 mm, or 10 mm to 45 mm, or 10 mm to 35 mm, or 10 mm to 30 mm, or 10 mm to 25 mm, or 15 mm to 25 mm. The average length of the fiber reinforcement can be considered as the average length of the fiber reinforcement before it is incorporated into the polyester composition, or it can be considered as the average length of the fiber reinforcement in the polyester composition.

[0052] In some embodiments, the fibrous reinforcing agent is selected from the group consisting of inorganic fillers (such as talc, mica, kaolin, calcium carbonate, calcium silicate, magnesium carbonate, etc.), carbon fibers, synthetic polymer fibers, aramid fibers, aluminum fibers, titanium fibers, magnesium fibers, boron carbide fibers, rock wool fibers, steel fibers, and wollastonite.

[0053] In some embodiments, the polyester composition does not contain hollow reinforcing agents. Hollow reinforcing agents include, but are not limited to, hollow glass fibers and glass bubbles. As used herein, "free of" a component means that the polyester composition has a concentration of less than 5% by weight, or less than 2% by weight, or less than 1% by weight, or less than 0.1% by weight, or less than 0.05% by weight, or less than 0.001% by weight, or even an undetectable concentration of the indicated component. Generally, hollow reinforcing agents undesirably reduce the mechanical performance (e.g., notched impact strength) of the polyester composition.

[0054] As for toughening agents, they are generally low Tg polymers. For example, in some embodiments, the toughening agents have a Tg below room temperature, or below 0°C, or even below -25°C. As a result of their low Tg, the toughening agents are typically elastomeric at room temperature. The toughening agents can be functionalized polymer backbones.

[0055] The polymer backbone of the toughening agent may be selected from elastomeric backbones comprising polyethylene and copolymers thereof, such as ethylene-butene, ethylene-octene; polypropylene and copolymers thereof; polybutene; polyisoprene; ethylene-propylene-rubber (EPR); ethylene-propylene-diene monomer rubber (EPDM); ethylene-acrylate rubber; butadiene-acrylonitrile rubber; ethylene-acrylic acid (EAA); ethylene-vinyl acetate (EVA); acrylonitrile-butadiene-styrene rubber (ABS); block copolymer styrene ethylene butadiene styrene (SEBS); block copolymer styrene butadiene styrene (SBS); core-shell elastomers of the methacrylate-butadiene-styrene (MBS) type; or mixtures of one or more of the above.

[0056] When the toughening agent is functionalized, the backbone functionalization can result from copolymerization of monomers containing functional groups or from grafting the polymer backbone with additional components.

[0057] Specific examples of functionalized toughening agents are, inter alia, terpolymers of ethylene, acrylic esters and glycidyl methacrylate, copolymers of ethylene and butyl ester acrylate; copolymers of ethylene, butyl ester acrylate and glycidyl methacrylate; ethylene-maleic anhydride copolymers; EPR grafted with maleic anhydride; styrene copolymers grafted with maleic anhydride; SEBS copolymers grafted with maleic anhydride; styrene-acrylonitrile copolymers grafted with maleic anhydride; ABS copolymers grafted with maleic anhydride.

[0058] The toughening agent may be present in the polyester composition in a total amount greater than 1 wt%, or greater than 2 wt%, or greater than 3 wt%, based on the total weight of the polyester composition. The toughening agent may be present in the polyester composition in a total amount less than 30 wt%, or less than 20 wt%, or less than 15 wt%, or less than 10 wt%, based on the total weight of the polyester composition. In some embodiments, the toughening agent is present in the polyester composition in a total amount of 1 wt% to 30 wt%, or 2 wt% to 20 wt%, or 3 wt% to 15 wt%. In some embodiments, the polyester composition is free of toughening agents.

[0059] The polyester composition may also include other conventional additives commonly used in the art, such as plasticizers, colorants, pigments (e.g., black pigments such as carbon black and nigrosine), antistatic agents, dyes, lubricants (e.g., linear low density polyethylene, calcium or magnesium stearate, or sodium montanate), heat stabilizers, light stabilizers, flame retardants, nucleating agents, and antioxidants.

[0060] Preparation of Polyester Composition The polyester composition can be produced by methods known in the art. For example, in some embodiments, the polyester composition can be a mixture of semi-aromatic semi-crystalline polyesters, polyolefins, low D polyesters, and the like, as described above. k / D fIt may be formed by melt blending the glass fibers and additional ingredients.

[0061] Any suitable melt-blending method may be used to mix the polymeric and non-polymeric components. For example, the polymeric and non-polymeric components may be fed into a melt mixer, such as a single-screw or twin-screw extruder, a stirrer, a single-screw or twin-screw kneader, or a Banbury mixer, and the addition step may be simultaneous addition of all components or batchwise stepwise addition. When the polymeric and non-polymeric components are added gradually batchwise, a portion of the polymeric and / or non-polymeric components is added first and then melt-mixed with the remaining polymeric and non-polymeric components added thereafter until a well-mixed composition is obtained. When the reinforcing agent exhibits a long physical shape (e.g., long fibers), stretch extrusion can be used to prepare the reinforced composition.

[0062] Articles and uses Due at least in part to the excellent balance of dielectric and mechanical properties, polyester compositions can be desirably incorporated into portable electronic device components.

[0063] As used herein, a "portable electronic device" refers to an electronic device that is intended to be conveniently carried and used in a variety of locations. Portable electronic devices may include, but are not limited to, mobile phones, personal digital assistants ("PDAs"), laptop computers, tablet computers, wearable computing devices (e.g., smart watches, smart glasses, etc.), cameras, portable audio players, portable radios, global positioning system receivers, and portable game consoles.

[0064] The portable electronic device component can include, for example, a wireless antenna and the polyester composition. In this case, the wireless antenna can be a WiFi antenna or an RFID antenna. The portable electronic device component can also be an antenna housing.

[0065] In some embodiments, the portable electronic device component is an antenna housing. In some such embodiments, at least a portion of a wireless antenna is disposed on the polyester composition. Additionally or alternatively, at least a portion of the wireless antenna can be detached from the polyester composition. In some embodiments, the portable electronic device component can be an attachment component having mounting holes or other fastening devices (including, but not limited to, a snap-fit ​​connector between itself and another component of the portable electronic device, including, but not limited to, a circuit board, a microphone, a speaker, a display, a battery, a cover, a housing, an electrical or electronic connector, a hinge, a wireless antenna, a switch, or a switch pad). In some embodiments, the portable electronic device component can be at least a portion of an input device. In some embodiments, the portable electronic device component can be a frame (e.g., a mobile phone or tablet frame) or a frame component.

[0066] Articles can be molded from the polyester compositions by any process compatible with thermoplastics, such as extrusion, injection molding, blow molding, rotational molding, or compression molding.

[0067] The article can be printed from the polyester composition by a process comprising the step of extrusion of the material, for example in the form of a filament, or by a process comprising the step of laser sintering of the material, in this case in the form of a powder.

[0068] Also provided is a method of manufacturing a three-dimensional (3D) object with an additive manufacturing system, comprising: - providing a component material comprising a polyester composition; - Printing layers of a three-dimensional object from this component material; The polyester composition can also be incorporated into a method comprising:

[0069] The polyester composition may therefore be in the form of threads or filaments used in 3D printing processes, such as fused filament manufacturing, also known as fused deposition modeling ("FDM").

[0070] The polyester composition can also be in the form of a powder, such as a substantially spherical powder, used in 3D printing processes, such as selective laser sintering (SLS).

[0071] Use of polyester compositions and articles The polyester compositions and articles can be used to manufacture portable electronic device components, such as those described above.

[0072] The present invention also relates to the use of the polyester composition described above for 3D printing an object. [Example]

[0073] The examples demonstrate the dielectric and mechanical performance of the polyester compositions. The following components were used in the examples: - Polybutylene terephthalate ("PBT") (polyester): PBT in pellet form was purchased from Celanese under the trade name Celanex 1400A® / Celanex 1401A®. - Polyethylene naphthalate ("PEN") (polyester): PEN in pellet form was purchased from Indorama®. - Polymethylpentene ("PMP") (Polyolefin): PMP is a polyolefin commonly used in the manufacture of RTP or Orida TM was obtained from either - Glass Fiber 1 ("GF1"): Product Name CS(HL)301HP TM LowD was commercially obtained from Chongqing Polycomp International Corp. as k / D f Glass fiber having a D of less than 5.0 when measured according to ASTM D150 at 1 MHz kand D less than 0.002 f It has. - Glass Fiber 2 ("GF2"): High D k / D f E-glass fiber. Additives: Nucleating agent Mineral Talc Mistron Vapor R from Mineral and Pigment Solution Southwest, heat stabilizer (Irganox® 1098) from BASF Corporation, Hostanox® P-EPQ were purchased from Clariant Corporation. Unless otherwise stated, the additives (Mineral Talc Mistron Vapor R, Irganox® 1098, and Hostanox® P-EPQ®) were used in the following amounts: 0.1 wt. %, 0.2 wt. %, and 0.8 wt. %, respectively.

[0074] Example 1 - Polybutylene Terephthalate This example demonstrates the mechanical and dielectric performance of polyester compositions such as PBT.

[0075] Several samples were prepared to demonstrate mechanical and dielectric performance. Sample parameters for Examples ("E") and Comparative Examples ("CE") are provided in Tables 1-3. Table 1 shows the results for PBT, PMP, and low D k / D f Glass fiber and high D k / D f Table 2 shows the sample parameters and test results for polyester blends containing PBT, PMP, and a mixture of glass fibers, including E-glass fibers. k / D f Table 3 shows sample parameters and test results for polyester blends containing PBT and PMP but no glass fiber. In the table, "PE weight ratio" refers to the polyester weight ratio as defined above.

[0076] Impact resistance was measured according to ASTM D256. Measurements were performed on 10 injection-molded ASTM flexural bars. Tensile properties were measured according to ASTM D638. Measurements were performed on 5 injection-molded ASTM tensile specimens and characterized using 2 mm / min for all tests. The ASTM tensile specimens had a length of 50.08 ± 1 mm, a width of 12.7 ± 0.2 mm, and a thickness of 3.2 ± 0.4 mm.

[0077] Dielectric properties were measured according to ASTM D150 (1 kHz and 1 MHz) or D2520 (1.77 GHz and 2.45 GHz). For dielectric properties measured using ASTM D150, measurements were performed on a 4.0 mm flat disk with a diameter of 50.8 mm. D at 1 MHz and 1 kHz was measured on an injection molded disk with dimensions of 50.8 mm diameter x 4.0 mm thick. k and D f Measurements were made on ASTM flexbars with the following dimensions: 3.2 mm x 12.7 mm x 125 mm. Dielectric properties were measured using ASTM D2520. Measurements were made on injection molded rectangular ASTM flexbars at 1.77 GPa and 2.45 GPa. Samples were conditioned according to ASTM D618 procedure before testing according to ASTM D150. For dielectric properties measured using ASTM D2520, measurements were made on ASTM flexbars with the following dimensions: 3.2 mm x 12.7 mm x 125 mm. k and D f For ASTM D2520, as-molded samples were tested.

[0078] As mentioned above, Tables 1 to 3 show the test results.

[0079] [Table 1]

[0080] [Table 2]

[0081] [Table 3]

[0082] Referring to Tables 1-3, the samples containing glass fiber had significantly different notched impact behavior as a function of PE weight ratio compared to the samples without glass fiber. Figure 1 is a graph showing a plot of normalized notched impact strength as a function of PE weight ratio. The solid line with black circles (Series A) shows the normalized notched impact strength of the samples without glass fiber (Table 3). The dashed line with white circles (Series B) shows the normalized notched impact strength of the samples without glass fiber (Table 3). k / D f The normalized notched impact strength of samples containing only glass fibers (Table 2) is shown. The dash-dotted line with black triangles (series C) represents the low D k / D f and high D k / D f The normalized notched impact strengths of samples containing glass fiber blends (Table 1) are shown. For clarity, the normalized values ​​represent the value for each series (each table) divided by the maximum value for each series. A comparison of Series B with Series A shows that the presence of glass fiber surprisingly and qualitatively radically changes the behavior of the notched impact performance of polyester blends. For example, Series A shows significant inflection points near PE weight ratios of approximately 70% and 97%, which are either absent or significantly smaller in magnitude in Series B. Similar results are seen when comparing Series C with Series A. Furthermore, a comparison of Series C with Series B reveals that the low D k / D f and high D k / D f The addition of glass fiber further surprisingly and qualitatively changes the behavior of the notched impact as a function of the PE weight ratio. Furthermore, a comparison of E4 and CE3 shows that at 20 wt. % GF1, there is a surprising increase in both notched and unnotched impact resistance when the polyester composition contains a blend of PBT and PMP. In all cases, the examples (PE weight ratios between 70% and 95%) had an excellent balance of impact and dielectric performance.

[0083] Example 2 - Polyethylene Naphthalate This example demonstrates the mechanical and dielectric performance of polyester compositions containing PEN.

[0084] Several samples were prepared to demonstrate mechanical and dielectric performance, and the sample parameters are shown in Table 4 below.

[0085] [Table 4]

[0086] Referring to Table 4, samples with 92.7% and 85.5% PE weight ratios surprisingly had increased notched impact resistance relative to samples with 100% and 0% PE weight ratios. All examples (PE weight ratios between 70% and 90%) had an excellent balance of impact and dielectric properties. Furthermore, it is noted that the unnotched impact of E8 was greater than that of CE1 and E9. Both E8 and E9 had desirable dielectric performance. For clarity, CE2 is reproduced in Table 4 for ease of comparison.

[0087] The above-described embodiments are intended to be illustrative, not limiting. Additional embodiments are within the concept of the invention. In addition, while the present invention has been described with reference to specific embodiments, those skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. Any incorporation by reference of the above-described publications is limited such that no subject matter contrary to the express disclosure herein is incorporated.

Claims

1. - semi-aromatic semi-crystalline polyesters, - repeating units (R ＰＯ ) based on the total number of repeat units in said polyolefin; ＰＯ ) has the following formula: 【number】 (In the formula, R ５ ~R ８ is hydrogen and C １ ~C １０ and a polyolefin represented by the formula (I) (independently selected from the group consisting of alkyl groups, alkyl aryl groups, alkyl methyl ... - D of 5.5 or less when measured according to ASTM D150 at 1 MHz ｋ and D of 0.002 or less ｆ A glass fiber GF having - a polyester weight ratio of 70% to 95%; A polyester composition comprising: where: said polyester weight ratio being of the formula: [Equation 1] is given by -W ＰＥ and W ＰＯ are the weights of the semi-aromatic semi-crystalline polyester and the polyolefin in the polyester composition, respectively; The polyester composition has a D of 3.5 or less when measured according to ASTM D150 at 1 kHz ｋ and D of 0.003 or less ｆ and the polyester composition comprises a notched impact strength, measured according to ASTM D256, of at least 80 J / m; Polyester composition.

2. The semi-aromatic semi-crystalline polyester has the following formula: 【Chemistry 2】 (Wherein T is C １ ~C １８ and Ar is aryl. ＰＥ The polyester composition of claim 1 , comprising:

3. Repeating unit R ＰＥ is expressed by the following formula: 【Transformation 3】 (In the formula, R １ ~R ４ At each position, hydrogen and C １ ~C １２ 3. The polyester composition of claim 2, wherein q, n, and m are independently selected from the group consisting of alkyl, aryl, arylsulfonyl ...

4. 4. The polyester composition of claim 1, wherein the semi-aromatic semi-crystalline polyester is selected from the group consisting of polycyclohexylene dimethylene terephthalate ("PCT"), polyethylene terephthalate ("PET"), polybutylene terephthalate ("PBT"), polyethylene naphthalate ("PEN"), and polybutylene naphthalate ("PBN").

5. R ６ ~R ８ The polyester composition according to any one of claims 1 to 4, wherein is hydrogen.

6. R ３ is C ３ ~C １０ The polyester composition of claim 3 wherein the aryl group is alkyl.

7. 7. The polyester composition of claim 1, wherein the polyolefin is selected from the group consisting of poly(4-methyl-1-pentene), poly(1-butene), poly(1-pentene), and poly(1-hexene).

8. The polyester composition according to any one of claims 1 to 7, wherein the polyester weight ratio is 75% to 95%.

9. D at 1 MHz greater than 5.0 ｋ and a D at 1 MHz greater than 0.001 ｆ High D ｋ / D ｆ 9. The polyester composition of claim 1, further comprising glass fibers, wherein the high D k / D f glass fibers are different from the glass fibers GF.

10. The polyester composition according to claim 9, wherein the polyester weight ratio is 75% to 93%.

11. D of 3.4 or less when measured according to ASTM D150 at 1 MHz ｋ and D of 0.03 or less ｆ The polyester composition according to any one of claims 1 to 10, comprising:

12. A portable electronic device component comprising the polyester composition of any one of claims 1 to 11.

13. 13. The portable electronic device component of claim 12, wherein the portable electronic device is selected from the group consisting of a mobile phone, a personal digital assistant ("PDA"), a laptop computer, a tablet computer, a wearable computing device, a camera, a portable audio player, a portable radio, a global positioning system receiver, and a portable game console.

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