Water stable thermoplastic composition

Abstract

The present invention relates to a thermoplastic composition comprising, based on the weight of the composition, (A) from 40 to 70% by weight of a polycarbonate composition comprising, based on the weight of the polycarbonate composition, from 0 to 50% by weight of a first polycarbonate and from 100 to 50% by weight of a second polycarbonate, the first polycarbonate having a higher molecular weight than the second polycarbonate; (B) 10 to 40 wt% of a polyester composition comprising 30 to 70 wt% of a first polyester and 70 to 30 wt% of a second polyester, based on the weight of the polyester composition, the first polyester having a higher intrinsic viscosity than the second polyester; (C) 0.1 to 10% by weight of a hydrolysis stabilizer composition comprising at least one compound containing epoxy functional groups; (D) 0 to 15% by weight of an impact modifier; (E) 0 to 5% by weight of other components; wherein the total amount of (A) to (E) is 100% by weight, and wherein the composition is selected to have a combination of at least 70% of notched Izod Impact Retention as determined according to the method described in the specification, a heat distortion temperature of at least 90 DEG C as determined according to ISO 75A lay-flat mode under a load of 1.8 MPa, a melt volume rate of at least 10.0 g / 10 min as determined according to ISO 1133 (250 DEG C, 5.0 kg).

Description

[0001] The present invention relates to water-stable thermoplastic compositions comprising polycarbonate and polyester having improved flow properties and reduced molding shrinkage. The present invention further relates to articles comprising or consisting of such compositions.

[0002] Compositions comprising polycarbonate and polyester have excellent appearance, mechanical properties, dimensional stability and chemical resistance, and are widely used in various fields. In particular, compositions consisting of polycarbonate and poly(butylene terephthalate) (PBT) impart excellent mechanical properties (e.g., impact, ductility and dimensional stability) and chemical resistance to polycarbonate. These compositions are particularly useful in the field of interior and exterior parts such as in automobiles.

[0003] However, polyesters such as PBT having a relatively large number of -COOH end groups can affect the stability of polycarbonates in polyester-polycarbonate blends. It is believed that the -COOH end groups of the polyester can cause the polycarbonate to lose molecular weight, resulting in changes in the properties of the polycarbonate. This effect can be enhanced by the presence of catalysts or catalyst residues that may be applied during the manufacture of the polycarbonate.

[0004] US 9,920,198 discloses blends of polycarbonate (PC) and polylactic acid (PLA) comprising (a) branched bisphenol APC, (b) PLA, (c) a chain extender, and (d) a glycidyl methacrylate (GMA) functionalized polyolefin copolymer / terpolymer.

[0005] US 7,923,506 discloses a molding composition comprising: (a) 20 to 49.9 weight percent of a first polyester component having an intrinsic viscosity of 0.5 to 1.0 and comprising a first polybutylene terephthalate random copolymer which (1) is derived from a polyethylene terephthalate copolymer and (2) has at least one residue derived from a polyethylene terephthalate component; and (b) 20 to 49.9 weight percent of a second polyester component having an intrinsic viscosity of 1.1 to 1.4 The invention relates to a polyester having an intrinsic viscosity of 1000 μm and comprising a second polybutylene terephthalate random copolymer which (1) is derived from a polyethylene terephthalate component selected from polyethylene terephthalate and polyethylene terephthalate copolymers and (2) has at least one residue derived from the polyethylene terephthalate component; and (c) 0.01 to 20 weight percent of a carboxyl reactive component; wherein the first polyester component, the second polyester component and the optional at least one additive are present in a total amount of 100 weight percent.

[0006] The impact properties of compositions comprising polycarbonate and polyester can be enhanced by adding suitable impact modifiers. Such impact modifiers can be prepared by means of an emulsion polymerization process including the use of processing aids such as emulsifiers and coagulants. Such processing aids, if part of the impact modifier, may also cause the decomposition of the polycarbonate, i.e. promote hydrolysis.

[0007] In addition to the above, a quencher is usually added to the composition comprising polycarbonate and polyester in order to prevent transesterification of the polyester and the polycarbonate. Such quenchers are usually moderately acidic. In order to maintain a certain level of hydrolytic stability of the composition, it is necessary to select the quencher so that its acidity is sufficient to quench the residual catalyst in the polyester, but at the same time it does not significantly cause hydrolysis of the polycarbonate.

[0008]

[0006] It would therefore be desirable to provide compositions comprising polycarbonates and polyesters which have improved hydrolytic stability in demanding applications, particularly where the compositions may be exposed to moisture at elevated temperatures.

[0009] In addition, injection molded articles or parts made from PC / PBT compositions tend to shrink in size once removed from the mold and cooled. PC / PBT compositions typically suffer from high shrinkage and low warpage resistance due to the presence of PBT, which is a crystalline material.

[0010] Thus, there remains a need for blended PC / PBT thermoplastic compositions that effectively address the appropriate balance of properties required in the consumer electronics and / or automotive industries, such as thermoplastic compositions that can resist exposure to moisture at elevated temperatures while exhibiting good processability and dimensional stability.

[0011] The object of the present invention is to provide a thermoplastic composition having good initial mechanical properties and being suitable for use in applications in which the composition may be exposed to moisture at elevated temperatures, while improving the flow properties and reducing the molding shrinkage of the composition.

[0012] Another object of the present invention is to provide a thermoplastic composition comprising polycarbonate and polyester, wherein the composition has a good combination of water stability, impact properties and thermal stability.

[0013] According to the present invention, these objects are at least partially met. The present invention relates to a thermoplastic composition comprising, based on the weight of the composition:

[0014] (A) 40 to 70 weight percent of a polycarbonate composition comprising 0 to 50 weight percent of a first polycarbonate and 100 to 50 weight percent of a second polycarbonate, based on the weight of the polycarbonate composition, the first polycarbonate having a higher molecular weight than the second polycarbonate;

[0015] (B) 10 to 40 weight percent of a polyester composition comprising, based on the weight of the polyester composition, 30 to 70 weight percent of a first polyester and 70 to 30 weight percent of a second polyester, the first polyester having a higher intrinsic viscosity than the second polyester;

[0016] (C) 0.1 to 10 wt. % of a hydrolysis stabilizer composition comprising at least one compound containing epoxy functional groups;

[0017] (D) 0 to 15 wt % of an impact modifier;

[0018] (E) 0 to 5 wt % of other components;

[0019] wherein the total amount of (A) to (E) is 100 wt %, and wherein the composition has or is selected to have the following combination:

[0020] A notched Izod impact retention of at least 70% as determined by the method described in the specification,

[0021] Heat distortion temperature of at least 90°C measured under a load of 1.8 MPa according to ISO 75A flat method,

[0022] A melt volume rate determined according to ISO 1133 (250° C., 5.0 kg) of at least 10.0 g / 10 min.

[0023] The present invention will now be described in more detail.

[0024] Polycarbonate

[0025] In the context of the present invention, the term polycarbonate is understood to mean aromatic polycarbonate. The terms "polycarbonate" and "aromatic polycarbonate" both therefore have the same meaning and can be used interchangeably. As known to the skilled person, aromatic polycarbonates are polycarbonates containing aromatic groups.

[0026] Aromatic polycarbonates are generally manufactured using two different technologies. In the first technology, which is called the interfacial technology or interfacial process, phosgene reacts with bisphenol, usually bisphenol A (BPA), in the liquid phase. Another well-known technology is the so-called melt technology, sometimes also called melt transesterification or melt polycondensation technology. In the melt technology or melt process, a bisphenol, usually BPA, reacts with a carbonate, usually diphenyl carbonate (DPC), in the melt phase. Aromatic polycarbonates obtained by the melt transesterification process are known to be structurally different from aromatic polycarbonates obtained by the interfacial process. In this regard, it should be particularly noted that the so-called "melt polycarbonate" usually has the least amount of Fries branches, and Fries branches are generally absent in "interfacial polycarbonates". In addition, melt polycarbonates usually have a greater number of phenolic hydroxyl end groups, while polycarbonates obtained by the interfacial process are usually end-capped and have phenolic hydroxyl end groups of up to 150 ppm, preferably up to 50 ppm, and more preferably up to 10 ppm. Usually, the amount of phenolic hydroxyl end groups is below the detection limit.

[0027] The composition of the present invention comprises as component (A) 40 to 70 wt% of a polycarbonate composition, which comprises 0 to 50 wt% of a first polycarbonate and 100 to 50 wt% of a second polycarbonate, based on the weight of the polycarbonate composition. The amount of the first polycarbonate is preferably 0 to 40 wt%, preferably 0 to 35 wt%, based on the weight of the polycarbonate composition. The amount of the second polycarbonate is preferably 100 to 60 wt%, more preferably 100 to 65 wt%, based on the weight of the polycarbonate composition.

[0028] Preferably, the polycarbonate composition comprises at least 80 wt. %, preferably at least 90 wt. %, more preferably at least 95 wt. %, and even more preferably at least 99 wt. % of the first and second polycarbonates, based on the weight of the polycarbonate composition. Thus, preferably, the polycarbonate composition consists essentially of or consists of the first and second polycarbonates. The polycarbonate composition may contain additional polycarbonates, but preferably does not contain additional polymer components other than polycarbonates.

[0029] The first polycarbonate and the second polycarbonate can have a weight average molecular weight of 25000 to 60000 daltons, as long as the first polycarbonate has a higher molecular weight than the second polycarbonate. Preferably, the first polycarbonate has a weight average molecular weight of 45000 to 65000 daltons, preferably 50000 to 60000 daltons, measured by gel permeation chromatography using polystyrene standards. The second polycarbonate can have a weight average molecular weight of 25000 to less than 45000 g / mol, preferably 30000 to 40000 g / mol, measured by gel permeation chromatography using polystyrene standards. If the polycarbonate is a mixture of two or more aromatic polycarbonates, the Mw should be determined based on the mixture, wherein each of the aromatic polycarbonates preferably constituting the mixture has an Mw of 20000 to 45000 g / mol.

[0030] Preferably, the polycarbonate composition comprises at least two bisphenol A polycarbonates, and more preferably, the polycarbonate composition consists of two bisphenol A polycarbonates. In one aspect, the polycarbonate composition comprises or consists of two interfacial polycarbonates. In another aspect, the polycarbonate composition comprises or consists of two molten polycarbonates. In another aspect, the polycarbonate composition comprises or consists of a mixture of an interfacial polycarbonate and a molten polycarbonate.

[0031] The polycarbonate composition preferably has a melt volume rate (MVR) determined according to ISO 1133 (300° C., 1.2 kg) of 1 to 50 cc / 10 min, in particular 2 to 30 cc / 10 min, for example 10-15 cc / 10 min. The polycarbonate composition may also comprise at least one polycarbonate resin regenerated from a used product (so-called recycled polycarbonate resin). Used products here can be exemplified by: optical recording media, such as optical discs; transparent vehicle components, such as automobile window panes, automobile headlight covers and windshields; containers, such as water bottles; eyeglass lenses; and building elements, such as soundproofing walls, glazing, corrugated boards. It is also possible to use reject products, powdered materials obtained, for example, from gates and runners, and pellets obtained by melting the aforementioned substances. The recycled polycarbonate resin is preferably at most 60% by weight and more preferably at most 40% by weight of the polycarbonate composition present in the thermoplastic composition of the invention.

[0032] Polyester

[0033] The composition of the present invention comprises as component (B) 10 to 40% by weight of a polyester composition comprising 30 to 70% by weight of a first polyester and 70 to 30% by weight of a second polyester based on the weight of the polyester composition. The amount of the first polyester is preferably 40 to 50% by weight, more preferably about 50% by weight, based on the weight of the polyester composition. The amount of the second polyester is preferably 50 to 40% by weight, more preferably about 50% by weight, based on the weight of the polyester composition.

[0034] According to the present invention, the first polyester has an intrinsic viscosity of 1.0 to about 2.0 dl / g and the second polyester has an intrinsic viscosity of 0.4 to about 0.8 dl / g, measured in a 60:40 phenol / tetrachloroethane mixture at 23°C.

[0035] Preferably, the polyester composition comprises or consists of at least two poly(butylene terephthalate) (PBT), and more preferably the polycarbonate composition consists of two PBTs. For example, the polyester composition may comprise a first PBT having an intrinsic viscosity of 1.0 to 2.0 dl / g, preferably 1.1 to 1.4 dl / g, and a second PBT having an intrinsic viscosity of 0.4 to 0.8 dl / g, preferably 0.4 to 0.6 dl / g.

[0036] The polyester may also include mechanically recycled PBT or PBT obtained from renewable resources. Polyesters such as PBT are well known to the skilled person per se. The PBT used in the composition of the present invention may, for example, be a polymer comprising polymerized units derived from terephthalic acid or its diester, such as dimethyl terephthalate, and polymerized units derived from butanediol, such as 1,4-butanediol.

[0037] The PBT may have a carboxyl end group content of 10 to 80 mmol / kg, preferably 20 to 60 mmol / kg, more preferably 20 to 40 mmol / kg, as determined according to ASTM D7409-15.

[0038] According to the invention, the polyester preferably does not contain or consists of polylactic acid, such as the material identified as "PLA" in US 9,920,198. According to the invention, the thermoplastic composition preferably does not contain polylactic acid, such as the material identified as "PLA" in US 9,920,198.

[0039] Hydrolysis Stabilizer

[0040] According to the present invention, the thermoplastic composition of the present invention with improved hydrolytic stability comprises 0.1 to 10 wt. %, preferably 0.5 to 3 wt. %, based on the weight of the composition, of a hydrolysis stabilizer composition comprising at least one compound containing epoxy functional groups. Preferably, the composition comprises at least 80 wt. %, preferably 90 wt. % to 100 wt. %, based on the weight of the hydrolysis stabilizer composition, of at least one compound containing epoxy functional groups.

[0041] The epoxy compound may have one or more epoxy functional groups. The term "multifunctional epoxy compound" is defined to include compounds having at least two epoxy functional groups. A preferred difunctional epoxy compound is 3,4-epoxycyclohexyl-3,4-epoxycyclohexyl carboxylate, which is commercially available as ERL-4221 epoxy resin from Union Carbide. Other preferred examples of difunctional epoxy compounds are bis(3,4-epoxycyclohexylmethyl)adipate, vinylcyclohexene diepoxide, bisphenol diglycidyl ether, diglycidyl adducts of amides, diglycidyl adducts of carboxylic acids, and the like.

[0042] Other hydrolysis stabilizers containing epoxy functional groups can be ethylene and / or styrene copolymers, which contain repeating units derived from ethylene and epoxy comonomers, and the epoxy comonomers include, for example, glycidyl acrylate, glycidyl methacrylate, glycidyl butyl acrylate, glycidyl vinyl ether, or a combination of two or more thereof. Frequently used ethylene and / or styrene copolymers may further contain repeating units derived from esters of unsaturated carboxylic acids (including (meth) acrylates or (meth) acrylic acid C1-C8 alkyl esters, or a combination of two or more thereof). "(Meth) acrylate" refers to acrylate, alkyl acrylate, methacrylate, or a combination of two or more thereof. Examples of alkyl acrylates include methyl acrylate, ethyl acrylate and butyl acrylate.

[0043] The ethylene and / or styrene copolymers may also comprise, consist essentially of, or consist of repeating units derived from ethylene and / or styrene and an epoxy comonomer (including, for example, glycidyl esters of acrylic acid or methacrylic acid, glycidyl vinyl ether, or combinations thereof) and an additional comonomer (e.g., carbon monoxide). Such epoxy compounds are commercially available or may be prepared by techniques well known to those skilled in the art.

[0044] Impact modifiers

[0045] The thermoplastic composition of the present invention optionally comprises an impact modifier. The amount of the impact modifier may be 0 to 15 wt % based on the weight of the composition. Preferably, the impact modifier is included in the composition in an amount of 2 to 12 wt %, more preferably 4 to 8 wt %.

[0046] Suitable impact modifiers are typically high molecular weight elastomeric materials derived from olefins, monovinyl aromatic monomers, acrylic and methacrylic acids and their ester derivatives, and conjugated dienes. The polymers formed from the conjugated dienes can be fully or partially hydrogenated. The elastomeric material can be in the form of a homopolymer or copolymer, including random, block, radial block, grafted, and core-shell copolymers. Combinations of impact modifiers are also used.

[0047] The impact modifier preferably comprises or consists of at least one of an acrylonitrile-butadiene-styrene (ABS) polymer and / or a methyl methacrylate-butadiene-styrene (MBS) polymer.

[0048] Other components

[0049] The thermoplastic composition disclosed herein comprises 0 to 5% by weight of other components, which are preferably selected from reinforcing fillers or non-reinforcing fillers, such as talc, calcium carbonate, glass flakes, glass fibers, etc., antifogging agents, plasticizers, flow enhancing additives, lubricants, pigments, dyes, flame retardants, nucleating agents, heat stabilizers, UV absorbers, UV stabilizers, dispersants, surfactants, antistatic agents, slip agents, or a combination of two or more thereof. Such additional components are known per se to the skilled person.

[0050] Preferably, the other components according to the present invention comprise 0.01 to 1 wt. % of a compound selected from Group IB metal phosphates and Group IIB metal phosphates, based on the weight of the composition. Preferably, the compound is selected from Group IB and / or Group IIB metal acid phosphates, metal acid pyrophosphates and metal polyphosphates, more preferably the catalyst quencher is zinc phosphate. The compound is used as a quencher of the catalyst or catalyst residues in the polyester.

[0051] Preferably, the other components comprise 0.01 to 1 wt %, preferably 0.03 to 0.5 wt %, based on the weight of the composition, of a compound containing at least one of an alkali metal cation or an alkaline earth metal cation and a halogen anion, the compound preferably being selected from one or more of lithium fluoride, lithium iodide, potassium bromide, potassium iodide, sodium dihydrogen phosphate, sodium acetate, sodium benzoate, sodium hexanoate, sodium stearate, sodium ascorbate and magnesium hexanoate.

[0052] Composition

[0053] The combination of specific types and amounts of materials constituting the thermoplastic composition results in property characteristics in particular in terms of water stability, mechanical, dimensional and thermal properties. The examples and comparative examples disclosed herein provide the skilled person with materials that fall within and do not fall within the scope of the present invention, respectively, thereby forming a basis for developing further embodiments according to the present invention without undue burden.

[0054] According to the present invention, the thermoplastic composition comprises, based on the weight of the composition,

[0055] (A) 40 to 70 wt % of a polycarbonate composition;

[0056] (B) 10 to 40 wt.% of a polyester composition;

[0057] (C) 0.1 to 10 weight percent of a hydrolysis stabilizer composition comprising at least one compound containing epoxy functional groups;

[0058] (D) 0 to 15 wt. % of an impact modifier,

[0059] (E) 0 to 5% by weight of other components,

[0060] However, the total amount of (A) to (E) is 100% by weight.

[0061] The amount of component (A) may be 50 to 70% by weight.

[0062] The amount of component (B) may be 25 to 35% by weight.

[0063] The amount of component (C) may be 0.5 to 3% by weight.

[0064] The amount of component (D) may be from 2 to 12% by weight.

[0065] The amount of component (E) may be from 0.01 to 3% by weight.

[0066] Component A comprises 0 to 50 wt % of a first polycarbonate and 100 to 50 wt % of a second polycarbonate, based on the weight of the polycarbonate composition, the first polycarbonate having a higher molecular weight than the second polycarbonate.

[0067] Component B comprises 30 to 70 wt % of a first polyester and 70 to 30 wt % of a second polyester, based on the weight of the polyester composition, the first polyester having a higher intrinsic viscosity than the second polyester.

[0068] For the avoidance of doubt, the skilled person will appreciate that the total weight of the composition will be 100 wt % and that any combination of materials that does not add up to 100 wt % is impractical and not in accordance with the present invention.

[0069] According to the present invention, the thermoplastic composition is selected to have the following combination:

[0070] A notched Izod impact retention of at least 70% as determined by the method described in the specification,

[0071] A heat distortion temperature of at least 90°C, preferably 90°C to 120°C, measured in accordance with ISO 75A flat method under a load of 1.8 MPa,

[0072] A melt volume rate determined according to ISO 1133 (250° C., 5.0 kg) of at least 10.0 g / 10 min.

[0073] In preferred aspects, the thermoplastic composition exhibits a notched Izod impact retention that is at least about 5%, preferably at least about 10%, and more preferably at least about 20% greater than the same composition but without component (D).

[0074] Preferred ranges for the amounts of the components can be combined with preferred ranges for the properties of the composition without limitation, provided that they certainly fall within the scope of the invention as defined herein in its broadest form. That is, preferred ranges for one or more of the amounts and / or types of the components making up the thermoplastic composition can be combined with preferred ranges for one or more properties of the thermoplastic composition, and all such combinations are considered to be disclosed herein.

[0075] The composition can be made by various methods known in the art. For example, the polycarbonate, polyester and other components and any optional fillers are first blended in a high-speed mixer or mixed by hand. The blend is then fed into the throat of a twin-screw extruder via a hopper.

[0076] Preferably, the thermoplastic composition is prepared by a process comprising the steps of:

[0077] a) combining a polyester composition with a hydrolysis stabilizer composition and optionally other components in a first melt mixing device to form a stabilized polyester composition,

[0078] b) combining the stabilized polyester with a polycarbonate composition and optionally an impact modifier in a second melt mixing device.

[0079] The product from the second melt mixing device can be fed to an extruder. The extruder is set with a barrel temperature of 150° C. to 260° C. The extrudate can be immediately cooled in a water bath and pelletized. The pellets so prepared can be 0.6 cm long or shorter as required. Such pellets can be used for subsequent molding, shaping or forming.

[0080] Also provided are shaped, formed or molded articles comprising the composition. The composition can be molded into articles by various methods such as injection molding, extrusion and thermoforming. Some examples of articles include automotive and vehicle body panels such as bumper covers and bumpers or housings for electrical equipment.

[0081] Thus, the present invention relates to an article comprising or consisting of a thermoplastic composition or a thermoplastic composition obtainable by the process disclosed herein, wherein preferably the article is an automotive interior article or a housing for an electrical device.

[0082] More specifically, the present invention relates to a vehicle body part or a housing of an electrical device comprising or consisting of the thermoplastic composition disclosed herein. Likewise, the present invention relates to an article comprising or constituting any one or more selected from the group consisting of an instrument panel, a cup holder, a glove box, an instrument panel, an instrument panel carrier, a door covering, a door fixing, an armrest, a pillar covering, a seat covering, a trunk covering, and a component used in a heating, ventilation and / or air conditioning device. In addition, the present invention relates to a vehicle or an electrical device comprising the vehicle body part or the housing. The present invention relates to the use of a thermoplastic composition or a thermoplastic composition obtainable by the method disclosed herein in the manufacture of an article (preferably an automotive part, more preferably an interior automotive part).

[0083] The invention will now be further illustrated based on the following non-limiting examples.

[0084] Test methods

[0085] Example

[0086] The samples were molded by injection molding on a L&T ASWA 100T injection molding machine at 260° C., the mold temperature setting for all compositions was kept at 100° C. The components of the compositions and their sources are listed in Table 1.

[0087] Table 1: Components of the composition and their sources

[0088]

[0089]

[0090]

[0091] The amounts in Table 2 are weight percent based on the total weight of the composition. In all examples, the total amount of the components is equal to 100 weight percent. Table 2 shows that the thermoplastic composition comprising PC / PBT and an impact modifier, i.e., ABS or MBS, in the absence of the hydrolysis stabilizer of the present invention (CE1) does not show the desired hydro-aging properties in terms of notched Izod impact retention determined according to the method described above. In the presence of a hydrolysis stabilizer containing epoxy functional groups, although the hydro-aging properties are achieved, the desired balance of properties in terms of flow properties (MVR) and dimensional stability (shrinkage) is not achieved (CE2 to CE4). In addition, when only high molecular weight polycarbonate is used in a thermoplastic composition comprising a PBT composition having a specific ratio of split between high intrinsic viscosity PBT and low intrinsic viscosity PBT, the thermoplastic composition does not show the desired balance of properties according to the present invention (CE5 to CE7).

[0092] However, it is shown that the thermoplastic composition comprising the components according to the invention exhibits the desired hydroaging properties in terms of notched Izod impact retention, as well as a good balance of thermal, flow and dimensional properties in terms of HDT, MVR and shrinkage (E1 to E12). In addition, according to the invention, the combination of two different hydrolysis stabilizers (both with epoxy functional groups) also shows similar effects.

Claims

1. A thermoplastic composition comprising: (A) 40 to 70 weight percent of a polycarbonate composition comprising 0 to 50 weight percent of a first polycarbonate and 100 to 50 weight percent of a second polycarbonate, based on the weight of the polycarbonate composition, the first polycarbonate having a higher molecular weight than the second polycarbonate; (B) 10 to 40 weight percent of a polyester composition comprising, based on the weight of the polyester composition, 30 to 70 weight percent of a first polyester and 70 to 30 weight percent of a second polyester, the first polyester having a higher intrinsic viscosity than the second polyester; (C) 0.1 to 10 wt. % of a hydrolysis stabilizer composition comprising at least one compound containing epoxy functional groups; (D) 0 to 15 wt % of an impact modifier; (E) 0 to 5 wt % of other components; in, The total amount of (A) to (E) is 100 wt%, and wherein the composition is selected to have the following combination: A notched Izod impact retention of at least 70% as determined by the method set out in the specification, Heat distortion temperature of at least 90°C measured under a load of 1.8 MPa according to ISO 75A flat method, A melt volume rate determined according to ISO 1133 (250° C., 5.0 kg) of at least 10.0 g / 10 min.

2. The thermoplastic composition according to claim 1, wherein the polyester does not comprise or consists of polylactic acid.

3. The thermoplastic composition according to claim 1 or 2, wherein the first polycarbonate has a weight average molecular weight of 45000 to 65000 g / mol, preferably 50000 to 60000 g / mol, as measured by gel permeation chromatography using polystyrene standards.

4. Thermoplastic composition according to any one or more of claims 1 to 3, wherein the second polycarbonate has a weight average molecular weight of 25,000 to 45,000 g / mol, preferably 30,000 to 40,000 g / mol, measured by gel permeation chromatography using polystyrene standards.

5. The thermoplastic composition of any one or more of claims 1 to 4, wherein the first polyester has an intrinsic viscosity of 1.0 to about 2.0 dl / g and the second polyester has an intrinsic viscosity of 0.4 to about 0.8 dl / g, measured at 23°C in a 60:40 phenol / tetrachloroethane mixture.

6. The thermoplastic composition according to any one or more of claims 1 to 5, wherein the impact modifier comprises at least one of an acrylonitrile-butadiene-styrene (ABS) polymer and / or a methacrylate-butadiene-styrene (MBS) polymer.

7. Thermoplastic composition according to any one or more of claims 1 to 6, wherein the polycarbonate composition comprises or consists of at least two bisphenol A polycarbonates.

8. Thermoplastic composition according to any one or more of claims 1 to 7, wherein the polyester composition comprises or consists of at least two poly(butylene terephthalates).

9. The thermoplastic composition according to any one or more of claims 1 to 8, wherein component (E) comprises 0.01 to 1 wt. %, based on the weight of the composition, of a compound selected from Group IB metal phosphates and Group IIB metal phosphates.

10. Thermoplastic composition according to any one or more of claims 1 to 9, wherein the component (E) comprises 0.01 to 1% by weight, based on the weight of the composition, of a compound containing at least one of an alkali metal cation or an alkaline earth metal cation and a halogen anion, the compound preferably being selected from one or more of lithium fluoride, lithium iodide, potassium bromide, potassium iodide, sodium dihydrogen phosphate, sodium acetate, sodium benzoate, sodium hexanoate, sodium stearate, sodium ascorbate and magnesium hexanoate.

11. The thermoplastic composition according to any one or more of claims 1 to 10, further selected to have a molding shrinkage of 0.5 to 0.8% as measured according to the method described in the specification.

12. A method for producing a thermoplastic composition according to any one or more of claims 1 to 11, comprising the steps of: a) combining a polyester composition with a hydrolysis stabilizer composition and optionally other components in a first melt mixing device to form a stabilized polyester composition, b) combining the stabilized polyester composition with a polycarbonate composition and optionally an impact modifier in a second melt mixing device.

13. An article comprising or consisting of a thermoplastic composition according to any one or more of claims 1 to 11 or obtainable by the method according to claim 12, wherein preferably, the article is an automotive interior article or a housing for electrical equipment.

14. A vehicle or an electrical device comprising the article according to claim 13.

15. Use of a thermoplastic composition according to any one or more of claims 1 to 11 or obtainable by the process according to claim 12 for the manufacture of an article, preferably an automotive part, more preferably an interior automotive part.

Images