High-flow polyphenylsulfone composition

Abstract

Provided is a polymer composition that exhibits improved toughness while maintaining chemical resistance, and is suitable for the production of molded articles where a combination of high flow, impact resistance, and chemical resistance is required. The polymer composition includes polyphenylsulfone (PPSU) and a PEEK-PEDEK copolymer.

Description

[Technical Field]

[0001] Cross-reference of related applications This application claims priority under U.S. Provisional Patent Application No. 62 / 329,482 filed on 29 April 2016, European Patent Application No. 16187796.4 filed on 8 September 2016, and U.S. Provisional Patent Application No. 62 / 456,955 filed on 9 February 2017, the entire contents of each of these applications being incorporated herein by reference for any purpose.

[0002] The present invention relates to a highly fluid polymer composition containing polyphenylsulfone (PPSU) and PEEK-PEDEK copolymer. [Background technology]

[0003] PPSU is a high-performance poly(aryl ethersulfone) polymer with superior impact and chemical resistance compared to, for example, polysulfone (PSU) or polyetherimide (PEI). PPSU possesses excellent mechanical toughness and chemical resistance for many engineering applications. However, due to its relatively high melt viscosity, these advantages cannot always be utilized. This is particularly true for applications requiring very thin components or layers, such as portable electronic devices or wire coatings. Another example is fused deposition manufacturing (FDM). Low melt viscosity materials allow the viscosity required for polymer deposition to be achieved at lower temperatures, thus enabling polymer deposition without the need for extremely high melt temperatures. High temperatures can degrade the polymer over time, resulting in carbonized material that can clog deposition nozzles in additive manufacturing equipment or become incorporated into the manufactured component.

[0004] Therefore, there is a need for a highly fluid PPSU composition that does not impair the desirable properties of PPSU.

[0005] Detailed description of preferred embodiments This specification describes a polymer composition containing polyphenylsulfone (PPSU) and a PEEK-PEDEK copolymer (as described later), a method for producing the polymer composition, and a molded article containing the polymer composition.

[0006] The applicants were surprised to discover that blending the PEEK-PEDEK copolymer with PPSU produced a polymer composition exhibiting improved fluidity and impact resistance without compromising chemical resistance.

[0007] Traditionally, increasing the fluidity of PPSU has meant a trade-off between impact resistance and chemical resistance. For example, attempts have been made to improve the fluidity of PPSU by adding aromatic high-fluidity polymers such as polyetheretherketone (PEEK) and PSU, or melt-processable perfluoropolymers (such as MFA), or copolymers derived from the copolymerization of tetrafluoroethylene and vinyl methyl ether. Adding PEEK inevitably results in a loss of toughness in PPSU. Adding PSU also impairs the toughness of PPSU, and the improvement in fluidity is usually not very significant. Adding MFA provides a significant improvement in melt fluidity, but because melt-processable fluoropolymers (such as MFA) and PPSU are thermodynamically incompatible as a whole, this results in a decrease in toughness and aesthetic defects in the molded components from the composition.

[0008] The applicants found that the PEEK-PEDEK copolymer increases the fluidity of PPSU while overcoming all the aforementioned drawbacks. Unlike the other methods for improving fluidity described above, this method does not impair, but rather improves, the toughness of the polymer composition of the present invention. Furthermore, although the PEEK-PEDEK copolymer has relatively poor chemical resistance, the applicants surprisingly found that the addition of the PEEK-PEDEK copolymer to PPSU does not impair the chemical resistance of the PPSU, even with the addition of a considerable amount of the PEEK-PEDEK copolymer.

[0009] Therefore, the polymer composition may exhibit the advantageous chemical and mechanical properties described below.

[0010] The fluidity of a polymer composition can be determined by measuring its melt flow rate (MFR) and melt viscosity.

[0011] In some embodiments, the polymer composition has an MFR in the range of about 25 to about 70 g / 10 min, preferably about 35 to about 60 g / 10 min, more preferably about 40 to about 50 g / 10 min, as measured at 365°C with a load of 5.0 kg according to ASTM D1238. In other embodiments, the polymer composition has an MFR in the range of about 25 to about 45 g / 10 min, preferably about 27 to about 41 g / 10 min. In some embodiments, the melt flow rate of the polymer composition is about 30%, preferably about 60%, greater than the melt flow rate of PPSU alone (i.e., PPSU without other components in the polymer composition), and this melt flow rate is measured at 365°C with a load of 5.0 kg according to ASTM D1238.

[0012] Furthermore, the polymer composition was subjected to a temperature of 380°C and 500s. -1 Using a die with a shear rate and an orifice length of 15.240 ± 0.025 mm and an orifice diameter of 1.016 ± 0.008 mm, the melt viscosity may be in the range of preferably about 200 to about 550 Pa·s, about 250 to about 500 Pa·s, about 300 to about 450 Pa·s, about 350 to about 550 Pa·s, and about 365 to about 500 Pa·s, as measured according to ASTM D3835. In some embodiments, the melt viscosity of the polymer composition is about 12%, preferably about 25%, lower than the melt viscosity of PPSU alone.

[0013] Izod impact resistance is a common method for measuring the toughness of polymers. The polymer composition is preferably about 11 to about 21 ft-lb / inch. (Approximately 587~1121 J / m) Approximately 12 to 20 ft-lb / inch (Approximately 641~1068 J / m) Approximately 13 to 19 ft-lb / inch (Approximately 694~1015 J / m)Approximately 14 to 18 ft-lb / inch (Approximately 748~961 J / m) It may have notched Izod impact resistance within the range measured by ASTM D256.

[0014] The chemical resistance of plastics to polar organic chemicals can generally be measured by their resistance to sunscreen lotions, which are among the strongest consumer chemicals. In particular, sunscreen lotions generally contain various UV-absorbing chemicals that can be highly corrosive to plastics. Typical sunscreens include at least 1.8 wt% avobenzone (1-(4-methoxyphenyl)-3-(4-tert-butylphenyl)-1,3-propanedione), at least 7 wt% homosalate (3,3,5-trimethylcyclohexyl salicylate), and at least 5 wt% octocrylene (2-ethylhexyl 2-cyano-3,3-diphenyl acrylate). An example of the aforementioned sunscreen is commercially available from Edgewell (St. Louis, MO) under the trade name Banana Boat® Sport Performance® (SPF 30). The chemical resistance of a polymer composition can be measured using environmental stress crack resistance (ESCR) testing. ESCR is evaluated by measuring the smallest strain required to visually observe cracks or fissures in a molded sample of the polymer composition after exposing the sample to a strong chemical and aging it in a controlled environment ("critical strain"). Generally, a larger critical strain indicates greater chemical resistance of the polymer composition. In some embodiments, the polymer composition in question has an ESCR critical strain greater than 2.0% for sunscreen. The measurement of critical strain is described in detail in the examples below.

[0015] In some embodiments, the polymer composition has an "environmental stress crack resistance (ESCR) critical strain for sunscreen" greater than 2.0%, as evaluated according to the procedure described in the examples.

[0016] Due to the above characteristics, the resulting PPSU composition has improved fluidity and is suitable for use in applications requiring a combination of toughness and chemical resistance along with very low melt viscosity. Examples of such applications include thin-walled articles (e.g., articles having portions with a thickness of less than 2.0 mm, preferably less than 1.5 mm, and a ratio of average flow length to overall thickness of more than 50, preferably more than 100, more preferably more than 150), spinning, melt extrusion of thin molded articles (e.g., less than 0.05 mm, preferably less than 0.025 mm), insulating or protective coatings for wires, and additive manufacturing of molded articles via fused deposition modeling.

[0017] Polyphenylsulfone (PPSU) As used herein, "polyphenylsulfone" refers to a polymer in which at least 50% of repeating units have formula (I): JPEG0007913901000001.jpg31154(wherein each R is the same as or different from each other, and is selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, aryl, ether, thioether, carboxylic acid, ester, amide, imide, alkali or alkaline earth metal sulfonate, alkyl sulfonate, alkali or alkaline earth metal phosphonate, alkyl phosphonate, amine, and quaternary ammonium; each h is the same as or different from each other, and is an integer ranging from 0 to 4), the repeating unit (R PPSU ) means any polymer.

[0018] Preferably, at least 60 mol%, 70 mol%, 80 mol%, 90 mol%, 95 mol%, and most preferably at least 99 mol% of the repeating units in PPSU are the repeating unit (R PPSU ).

[0019] In some embodiments, the repeating unit (R PPSU ) is represented by the following formula (Ia): represented by JPEG0007913901000002.jpg30154, wherein R and h are as defined above. In some of such embodiments, each h is zero.

[0020] PPSU is available as RADEL® PPSU from Solvay Specialty Polymers USA, L.L.C.

[0021] The melt flow rate (MFR) of PPSU, measured at 365°C under a 5.0 kg load in accordance with ASTM D1238, ranges from about 5 g / 10 min to about 60 g / 10 min, preferably from about 10 g / 10 min to about 40 g / 10 min, and most preferably from about 14 g / 10 min to about 28 g / 10 min.

[0022] The weight average molecular weight (Mw) of PPSU, measured by gel permeation chromatography using either methylene chloride or N-methylpyrrolidone (NMP) as the solvent and a polystyrene molecular weight calibration standard, preferably ranges from 20,000 Daltons to 80,000 Daltons, more preferably from 30,000 Daltons to 70,000 Daltons, and most preferably from 40,000 Daltons to 60,000 Daltons.

[0023] In some embodiments, the polymer composition contains PPSU in an amount ranging from about 60 wt% to about 99 wt%, preferably from about 60 wt% to about 75 wt%, based on the total weight of the PEEK-PEDEK copolymer and PSSU.

[0024] PEEK-PEDEK copolymer As used herein, "PEEK-PEDEK copolymer" refers to - Formula (II): JPEG0007913901000003.jpg30154 repeating unit (R PEEK ); and - Formula (III): JPEG0007913901000004.jpg30154 repeating unit (R PEDEK ), and means a copolymer comprising In the formula, each R' is the same as or different from each other, and is selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, aryl, ether, thioether, carboxylic acid, ester, amide, imide, alkali or alkaline earth metal sulfonate, alkyl sulfonate, alkali or alkaline earth metal phosphonate, alkyl phosphonate, amine, and quaternary ammonium; each i is the same as or different from each other, and is an integer ranging from 0 to 4, and each j is the same as or different from each other, and is an integer ranging from 0 to 4.

[0025] In some embodiments, the repeating unit (R PEEK ) is selected from the group consisting of units of formula (IIa): JPEG0007913901000005.jpg28154, and the repeating unit (R PEDEK ) is selected from the group consisting of units of formula (IIIa): JPEG0007913901000006.jpg29154, wherein R', i and j are as described above.

[0026] Preferably, each i is zero, preferably each j is zero, and most preferably each of i and j is zero, such that the PEEK-PEDEK copolymer is: - the repeating unit (R JPEG0007913901000007.jpg25154 of formula (IIb): PEEK ); and - the repeating unit (R JPEG0007913901000008.jpg28154 of formula (IIIb): PEDEK ); comprises

[0027] The repeating units (R PEEK ) and (R PEDEK ) collectively account for at least 50 mol%, preferably at least 60 mol%, 70 mol%, 80 mol%, 90 mol%, 95 mol%, and most preferably at least 99 mol% of all repeating units in the PEEK-PEDEK copolymer.

[0028] Repeating unit (R PEEK ) and (R PEDEK ) is a molar ratio (R) in the range of 90 / 10 to 65 / 35, preferably 80 / 20 to 70 / 30. PEEK ) / (R PEDEK ) and exists within the PEEK-PEDEK copolymer.

[0029] The weight-average molecular weight Mw of the PEEK-PEDEK copolymer, as measured by gel permeation chromatography (GPC) using a polystyrene calibration standard, is preferably in the range of 50,000 to 110,000 daltons, more preferably 60,000 to 100,000 daltons, and most preferably 70,000 to 90,000 daltons. Preferably, the PEEK-PEDEK copolymer exhibits a melt viscosity of at least 30 Pa-s, preferably at least 50 Pa-s, and more preferably at least 80 Pa-s, as measured according to ASTM D3835 at 400°C and 1000 s-1 using a 0.5 × 3.175 mm tungsten carbide die.

[0030] Preferably, (PAEK-1) exhibits a melt viscosity of up to 550 Pa, more preferably up to 450 Pa-s, and most preferably up to 350 Pa-s, measured according to ASTM D3835 at 400°C and 1000 s-1 using a 0.5 × 3.175 mm tungsten carbide die.

[0031] In one embodiment, the polymer composition contains PEEK-PEDEK copolymer in an amount ranging from about 1% to about 40% by weight, preferably about 25% to about 40% by weight, based on the total weight of PEEK-PEDEK copolymer and polyphenylsulfone (PPSU).

[0032] Optional reinforcing filler The polymer composition may optionally also contain reinforcing fillers, such as fibrous or particulate fillers. Fibrous reinforcing fillers are materials having length, width, and thickness such that the average length is considerably greater than both the width and thickness. Preferably, such materials have an aspect ratio of at least 5, defined as the average ratio of length to minimum width and thickness. Preferably, the aspect ratio of reinforcing fibers is at least 10, more preferably at least 20, and even more preferably at least 50. Particulate fillers have an aspect ratio of up to 5, preferably up to 2.

[0033] Preferably, the reinforcing filler is selected from inorganic fillers such as talc, mica, kaolin, calcium carbonate, calcium silicate, and magnesium carbonate; glass fibers; carbon fibers, boron carbide fibers; wollastonite; silicon carbide fibers; boron fibers, graphene, and carbon nanotubes (CNTs). Most preferably, the reinforcing filler is glass fiber, preferably chopped glass fiber.

[0034] The amount of reinforcing filler may be in the range of 1% to 40% by weight, preferably 5% to 35% by weight, and most preferably 10% to 30% by weight, based on the total weight of the polymer composition, for particulate fillers, and 5% to 50% by weight, preferably 10% to 40% by weight, and most preferably 15% to 30% by weight, for fibrous fillers. In some embodiments, the polymer composition does not contain fibrous fillers. Alternatively, the polymer composition may not contain particulate fillers. Preferably, the polymer composition does not contain reinforcing fillers.

[0035] Optional additives In addition to PPSU, PEEK-PEDEK copolymer, and optional reinforcing fillers, the polymer composition may further contain optional additives such as titanium dioxide, zinc sulfide, zinc oxide, ultraviolet light stabilizers, heat stabilizers, antioxidants (organophosphates and phosphonites, etc.), acid scavengers, processing aids, nucleating agents, lubricants, flame retardants, smoke suppressants, antistatic agents, antiblocking agents, and conductive additives (carbon black, etc.).

[0036] If one or more optional additives are present, their total concentration is preferably less than 10% by weight, less than 5% by weight, and most preferably less than 2% by weight, based on the total weight of the polymer composition.

[0037] Method for producing polymer compositions A typical embodiment includes a method for producing the polymer composition described herein by melt-mixing PPSU, PEEK-PEDEK copolymer, an optional reinforcing filler, and an optional additive.

[0038] Polymer compositions can be prepared by any known melt-mixing method suitable for preparing thermoplastic molded compositions. Such methods may involve heating the polymer above its melting point to form a molten mixture of polymers. In some embodiments, the components for forming the polymer composition are supplied simultaneously or separately to a melt-mixing apparatus and melt-mixed within the apparatus. Suitable melt-mixing apparatuses include, for example, kneaders, Banbury mixers, single-screw extruders, and twin-screw extruders.

[0039] Molded articles containing polymer compositions Typical embodiments also include molded articles containing the polymer composition described above.

[0040] Molded articles can be manufactured from polymer compositions using any suitable melting method, such as injection molding, extrusion molding, rotational molding, or blow molding.

[0041] As described above, polymer compositions can be very suitable for manufacturing articles that are useful in a wide range of applications. For example, the high fluidity, toughness, and chemical resistance properties of polymer compositions make them particularly suitable for use in portable electronic devices, additive manufacturing such as 3D printing, aircraft interiors, tableware and steamers for food service, fibers for woven and nonwoven fabrics, and coatings for electric wires.

[0042] In some embodiments, the molded article is a structural component, such as a housing or frame component of a portable electronic device. Portable electronic devices are devices that are carried and used in various locations, exchanging / accessing data, for example, via wireless or mobile network connectivity. Typical examples of portable electronic devices include mobile phones, personal digital assistants (PDAs), laptop computers, tablet computers, radios, cameras and camera accessories, watches, calculators, music players, GPS receivers, portable game consoles, hard drives, and other electronic storage devices.

[0043] If any disclosure in a patent, patent application, or publication incorporated herein by reference contradicts the description in this application to such an extent that it obscures the terminology, the description in this application shall prevail.

[0044] Exemplary embodiments will be described in the following non-limiting embodiments. [Examples]

[0045] material The following PPSU was used in the examples.

[0046] Radel® PPSU R-5100 NT, available from Solvay Specialty Polymers USA, LLC. This is a medium viscosity grade PPSU with a melt flow rate (MFR) ranging from 14 to 20 g / 10 min, measured using a melt index instrument according to ASTM D1238 at 365°C with a 5.0 kg load. The specific lot used in the examples had an MFR of 17.0 g / 10 min.

[0047] The copolymer used in the examples was a PEEK copolymer in which a stoichiometric amount of hydroquinone was partially substituted with biphenol (4,4'-dihydroxyphenyl). These copolymers are also known as "PEEK-PEDEK copolymers," where "PEDEK" represents the polymer repeating unit derived from the polycondensation of biphenol and 4,4'-difluorobenzophenone.

[0048] The PEEK-PEDEK copolymer used in the examples is: 80 / 20 PEEK-PEDEK copolymer (80 mol% PEEK, 20 mol% PEDEK), 400°C and 1000°S -1 MV = 203 Pa-s; 75 / 25 PEEK-PEDEK copolymer (75 mol% PEEK, 25 mol% PEDEK), 400°C and 1000°S -1 MV = 150 Pa-s; and 70 / 30 PEEK-PEDEK copolymer (70 mol% PEEK, 30 mol% PEDEK), 400°C and 1000°S -1 MV = 194 Pa-s; That was the case.

[0049] Preparation of formulations The compositions of the examples and comparative examples are shown in Table 1 below. All polymer blends were prepared by first tumbling and blending the resin pellets in their respective quantities for approximately 20 minutes, followed by melt-kneading.

[0050] Testing of formulations Mechanical properties were measured using: 1) Type I tensile test specimens, and 2) 5 inches × 0.5 inches × 0.125 inches. (127mm×12.7mm×3.175mm) 3) Bending test specimens, and 4 inches x 4 inches x 0.125 inches for instrumented impact (Dynatup) testing. (101.6mm×101.6mm×3.175mm) All formulations were tested using injection-molded ASTM test specimens consisting of test plates. The following ASTM test methods were used to evaluate all compositions. D638: Tensile properties D790: Bending characteristics D256: Izod shock-resistant (with notch) D3763: Instrumentation shock resistance (Dynatup shock)

[0051] Melt rheology and melt workability were evaluated by two methods: 1) melt flow rate measured by ASTM-D1238 at 365°C with a 5 kg load; and 2) capillary rheometry using a Dynisco® LCR7000 capillary rheometer. Capillary rheometry was performed using a die with an orifice length of 15.240 ± 0.025 mm and an orifice diameter of 1.016 ± 0.008 mm, according to ASTM D3835, for 25 to 3500 s. -1 The experiment was conducted using a temperature of 380°C over the shear rate range.

[0052] Chemical resistance to sunscreen was tested using an ASTM D-246C (5 inches x 0.5 inches x 0.125 inches) mounted on a Bergen parabolic variable strain fixing jig (which varied the strain applied to the plastic material from approximately zero to approximately 2.0% to form a stressed assembly). (127mm×12.7mm×3.175mm) The test was performed by applying Banana Boat® SPF30 broad-spectrum sunscreen cream to the bending test specimens. The x% applied strain used herein is the strain required to stretch a molded sample of the polymer composition by x%. For example, if the length of the molded sample is 1 inch... (25.4mm) In that case, a 2% applied strain would be 1.02 inches in the direction of the applied strain. (25.9mm)This refers to the strain required to stretch the molded sample to a certain extent. The stressed assembly was aged for approximately 72 hours in a humidity-controlled environmental chamber at approximately 65°C and 90% relative humidity. The assembly was then removed from the chamber, and ASTM bending test specimens mounted on strain fixtures were inspected for all signs of cracking or fission. The critical strain at failure was recorded as the lowest strain level on the parabolic fixture on which cracking or fission was observed.

[0053] The effects of adding PEEK-PEDEK copolymer on the mechanical properties, chemical resistance, and flow properties of PPSU are shown in Table 1 below.

[0054] JPEG0007913901000009.jpg241164JPEG0007913901000010.jpg220170

[0055] As shown in the data in Table 1, even the addition of small amounts of PEEK-PEDEK copolymer significantly improved melt flowability and melt viscosity. Furthermore, this improvement in flowability was not achieved at the expense of reduced toughness, as is often the case in well-known polymer trade-offs between the mechanical toughness and melt flow properties of a polymer.

[0056] The melt fluidity of PPSU compositions modified with PEEK-PEDEK (Examples E1-E6) showed significantly improved fluidity and decreased melt viscosity compared to unmodified PPSU (Example C1). In fact, the MFR increased by at least 63% (Example E3) and as much as 139% (Example E5) compared to the MFR of PPSU (Example C1). The melt viscosity at low shear rates decreased by approximately 40% in the best case (Example E5) compared to the melt viscosity of PPSU (Example C1).

[0057] Surprisingly, the addition of the PEEK-PEDEK copolymer did not impair the mechanical properties of PPSU at all. Most notably, the addition of the PEEK-PEDEK copolymer actually improved toughness and impact resistance. The notched Izod impact of the example composition was about 25% to 50% greater than the notched Izod impact of undiluted PPSU of Comparative Example C1.

[0058] Finally, environmental stress crack resistance (ESCR) tests of the compositions in Examples E1-E6 showed no effect up to a maximum applied strain of 2.0%. This was the same result observed for undiluted PPSU in Comparative Example 1. Unexpectedly, despite the addition of 40% by weight of PEEK-PEDEK copolymers (Comparative Examples C2-C4), which have relatively low ESCR performance, no decrease in this important performance attribute of PPSU was observed as a result of improved fluidity.

Claims

1. (i) Formula (I) of at least 50 mol%: 99 to 60% by weight of polyphenylsulfone (PPSU) containing repeating units of (wherein each R is the same or different from each other and selected from the group consisting of halogens, alkyls, alkenyls, alkynyls, aryls, ethers, thioethers, carboxylic acids, esters, amides, imides, alkali or alkaline earth metal sulfonates, alkyl sulfonates, alkali or alkaline earth metal phosphonates, alkyl phosphonates, amines, and quaternary ammoniums; each h is the same or different from each other and is an integer in the range of 0 to 4); and (ii) - Formula (II): Repeating unit (R ＰＥＥＫ )and; - Formula (III): Repeating unit (R ＰＥＤＥＫ )and; (In the formula, each R' is either the same or different from each other and selected from the group consisting of halogens, alkyls, alkenyls, alkynyls, aryls, ethers, thioethers, carboxylic acids, esters, amides, imides, alkali or alkaline earth metal sulfonates, alkyl sulfonates, alkali or alkaline earth metal phosphonates, alkyl phosphonates, amines, and quaternary ammonium compounds; each i is either the same or different from each other and is an integer in the range of 0 to 4; and each j is either the same or different from each other and is an integer in the range of 0 to 4.) A PEEK-PEDEK copolymer comprising 1 to 40% by weight, Repeating unit (R ＰＥＥＫ ) and (R ＰＥＤＥＫ The total concentration of the repeating units in the PEEK-PEDEK copolymer is at least 50 mol%, Molar ratio of repeating units (R ＰＥＥＫ ) / (R ＰＥＤＥＫ ) is 80 / 20 to 70 / 30, PEEK-PEDEK copolymer A polymer composition containing the PEEK-PEDEK copolymer and polyphenylsulfone (PPSU), wherein the polymer composition does not contain any polymers other than the PEEK-PEDEK copolymer and polyphenylsulfone (PPSU), and the weight percentage of the PEEK-PEDEK copolymer is relative to the total weight of the PEEK-PEDEK copolymer and polyphenylsulfone (PPSU).

2. The polyphenylsulfone (PPSU) is at least 50 mol% of formula (Ib): The polymer composition according to claim 1, comprising repeating units.

3. The PEEK-PEDEK copolymer is - Equation (IIb): Repeating unit (R ＰＥＥＫ )and, - Formula (IIIb): Repeating unit (R ＰＥＤＥＫ )and, A polymer composition according to any one of claims 1 and 2, comprising:

4. The polymer composition according to any one of claims 1 to 3, wherein the polymer composition contains polyphenylsulfone (PPSU) in an amount ranging from 75 to 60% by weight, based on the total weight of the PEEK-PEDEK copolymer and the polyphenylsulfone (PSSU).

5. The polymer composition according to any one of claims 1 to 4, wherein the polymer composition contains the PEEK-PEDEK copolymer in an amount ranging from 25 to 40% by weight, based on the total weight of the PEEK-PEDEK copolymer and the polyphenylsulfone (PSSU).

6. The polymer composition according to any one of claims 1 to 5, wherein the polymer composition has a notched Izod impact resistance measured according to ASTM D256 in the range of 11 to 21 ft-lb / inch (587 to 1121 J / m).

7. The polymer composition has a critical strain of environmental stress crack resistance to sunscreen greater than 2.0%, The environmental stress crack resistance was measured as the critical strain of a 5-inch × 0.5-inch × 0.125-inch (127 mm × 12.7 mm × 3.175 mm) bending test specimen of ASTM D-246C molded from the polymer composition, coated with sunscreen cream, and subjected to a 2% relative strain for 72 hours at 65°C and 90% relative humidity. The sunscreen is a polymer composition according to any one of claims 1 to 6, comprising at least 1.8% by weight of avobenzone, at least 7% by weight of homosalate, and at least 5% by weight of octocrylene.

8. A polymer composition according to any one of claims 1 to 7, further comprising a reinforcing filler.

9. The polymer composition according to claim 8, wherein the reinforcing filler is a fibrous filler, and the polymer composition contains the fibrous filler in an amount ranging from 1% by weight to 40% by weight, based on the total weight of the polymer composition.

10. The polymer composition according to claim 9, wherein the reinforcing filler is glass fiber.

11. A method for producing the polymer composition according to any one of claims 1 to 10, comprising melt-mixing the polyphenylsulfone (PPSU) and the PEEK-PEDEK copolymer.

12. A molded article comprising the polymer composition according to any one of claims 1 to 10.

13. The molded article according to claim 12, wherein the molded article is a component of a portable electronic device, a wire coating, or an article manufactured by additive manufacturing.

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