Polycarbonate composition having high comparative tracking index

Abstract

The present invention relates to a polycarbonate composition comprising: a) 60% to 95% by weight of a copolycarbonate; and b) 5% to 40% by weight of a homopolycarbonate, based on the total weight of the composition, the weight average molecular weight of the homopolycarbonate being in the range of 24000 g / mol to 28000 g / mol, and the total amount of the homopolycarbonate and the copolycarbonate in the composition being 96% to 100% by weight based on the total weight of the composition. The present invention also relates to a molded article made from this composition. The polycarbonate composition according to the present invention has a high comparative tracking index.

Description

[Technical field]

[0001] The present invention relates to polycarbonate (PC) compositions, in particular to polycarbonate compositions having high comparative tracking indexes, and to molded articles made therefrom. [Background technology]

[0002] Polycarbonate is widely used in a wide variety of applications such as in the automotive, electrical and electronic fields due to its excellent optical, mechanical and heat resistance properties, as well as its excellent thermal processability.

[0003] Copolycarbonates, as a special type of polycarbonate, are widely used in the electrical and electronic fields, as housing materials for lighting and in applications where specific thermal and mechanical properties are required, such as hairdryers, applications in the automotive field, plastic covers, diffusion screens or waveguiding elements, and lamp covers or lamp bezels.

[0004] It is known that the heat distortion resistance of polycarbonate can be improved by introducing certain building blocks based on 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (bisphenol TMC) into the polycarbonate backbone. The copolycarbonates obtained in this way (so-called high Tg polycarbonates) are expensive. Moreover, due to the relatively high glass transition temperature (Tg) of this type of copolycarbonate, its flowability is not high.

[0005] In recent years, in the field of electrical and electronic applications, there has been a trend towards miniaturizing electronic and electrical devices. This has led to the adoption of more complex and compact designs of electrical devices that contain plastic housings or components. Therefore, there has been a need for safety-related properties of plastic materials, such as the Comparative Tracking Index (CTI), in the field of electronics and electrical applications.

[0006] For example, plastic materials require a high CTI rank (e.g., CTI=600V determined according to IEC60112:2011). However, it is well known that the comparative tracking index for standard polycarbonate resins is only around 250V or even below. Although there are few varieties, PC / ABS or PC / PBT blends can increase the CTI value of the finished blend more or less. For example, commercially available PC / ABS alloys generally show a CTI in the range of 275V to 350V, which is a little higher than standard bisphenol A polycarbonate (CTI of about 250V).

[0007] US Patent No. 5,399,663 discloses a composition having a high CTI ranking that includes polycarbonate, polyethylene terephthalate, and a flame retardant. However, the composition disclosed in US Patent No. 5,399,663 has a reduced optical quality. This significantly limits the potential use of such materials.

[0008] Therefore, there is a need to increase the CTI of polycarbonate compositions while maintaining the excellent properties of polycarbonate resins, such as good optical quality, high heat resistance, and good flowability. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] China Patent Application Publication No. 102070886 Summary of the Invention

[0010] Accordingly, one object of the present application is to provide a polycarbonate composition having a good combination of comparative tracking index, optical quality, heat resistance, and flowability.

[0011] Another object of the present application is to provide articles that have a good combination of comparative tracking index, optical quality, and heat resistance.

[0012] In a first aspect, the present invention provides a polycarbonate composition comprising, based on the total weight of the composition: a) 60% to 95% by weight of a copolycarbonate, i) 42 mol% to 90 mol% of formula (1): [ka] (In the formula, * indicates the position where formula (1) is attached to the polymer chain, R 1 are each independently hydrogen or C 1 ~C 4 is alkyl, R 2 are each independently 1 ~C 4 is alkyl, n is 0, 1, 2, or 3; ii) 10 mol% to 58 mol% of formula (2): [ka] (In the formula, * indicates the position where formula (2) is attached to the polymer chain, R 3 each independently represents H, linear or branched C 1 ~C 10 is alkyl, and R 4 are each independently a linear or branched C 1 ~C 10 alkyl) units; (wherein mol % is calculated based on the total number of moles of units of formula (1) and formula (2)); b) a homopolycarbonate containing 5% by weight to 40% by weight of units of formula (2) as defined above; where The weight average molecular weight of the homopolycarbonate is in the range of 24000 g / mol to 28000 g / mol, The weight content of the unit of formula (1) in the polycarbonate composition is 42% by weight to 80% by weight based on the total weight of the composition, and A polycarbonate composition is provided, wherein the total amount of the homopolycarbonate and the copolycarbonate in the composition is 96% by weight to 100% by weight based on the total weight of the composition.

[0013] As used herein, the weight content (C 1 / C / W ) is calculated as follows: C 1 / C / W =(C 1 / CO / M ×M w1 )×C co / c / w / (C 1 / CO / M ×M w1’ +C 2 / CO / M ×M w2 ) (In the formula, C 1 / C / W represents the weight content of the unit of formula (1) in the polycarbonate composition, C 1 / CO / M represents the molar content of units of formula (1) in the copolycarbonate, M w1 represents the molecular weight of the unit of formula (1), expressed in grams per mole, M w1’ represents the total molecular weight of the unit of formula (1) and -C=O-, expressed in grams per mole, C 2 / CO / M represents the molar content of units of formula (2) in the copolycarbonate, M w2 represents the molecular weight of the unit of formula (2), expressed in grams per mole, and C co / c / w represents the weight content of the copolycarbonate in the polycarbonate composition).

[0014] The inventors have unexpectedly found that the compositions according to the invention have a comparative tracking index of up to 600 V as determined according to IEC 60112:2011, a transmittance of more than 86% for visible light having a wavelength between 390 nm and 780 nm as determined according to ASTM D1003:(2013) for a sheet made from said composition having a thickness of 3 mm, a transmittance of more than 9 cm as determined according to ISO 1133:2011 at 330° C. and 1.2 kg. 3 / 10min, and a Vicat softening temperature determined according to ISO 306:(2013) greater than 175°C.

[0015] Comparative Tracking Index (CTI) means the highest voltage that five test specimens withstand during a test period of 50 drops without tracking breakdown and sustained flame, as determined in accordance with IEC 60112:2011.

[0016] In a second aspect, the present invention provides a molded article made from a polycarbonate composition according to the first aspect of the invention.

[0017] In a third aspect, the present invention provides a method of making the above-mentioned molded article comprising injection molding, extrusion molding, blow molding, or thermoforming a polycarbonate composition according to the first aspect of the invention.

[0018] Other subjects, as well as characteristics, aspects and advantages of the present invention will become even more apparent upon reading the following detailed description and examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Detailed Description of the Invention Hereinafter, unless otherwise indicated, ranges of values, in particular the expressions "between ... and ..." and "to ...", the limits are included within this range.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event that a definition of a term herein conflicts with a meaning commonly understood by one of ordinary skill in the art to which this invention belongs, the definition set forth herein shall apply.

[0021] Throughout this application, the term "comprising" should be interpreted to encompass not only all specifically stated features but also any additional, unspecified features. As used herein, use of the term "comprising" also describes embodiments in which no features are present other than those specifically stated (i.e., "consisting of").

[0022] Unless otherwise specified, all numbers expressing quantities of ingredients or the like used in the detailed description and claims should be understood to be modified by the term "about."

[0023] Ingredient A According to a first embodiment, the polycarbonate composition according to the invention comprises a copolycarbonate.

[0024] In this application, copolycarbonates are i) 42 mol% to 90 mol% of formula (1): [ka] (In the formula, * indicates the position where formula (1) is attached to the polymer chain, R 1 are each independently hydrogen or C 1 ~C 4 is alkyl, R 2 are each independently 1 ~C 4 is alkyl, n is 0, 1, 2, or 3; ii) 10 mol% to 58 mol% of formula (2): [ka] (In the formula, * indicates the position where formula (2) is attached to the polymer chain, R 3 each independently represents H, linear or branched C 1 ~C 10 Alkyl, preferably H, linear or branched C 1 ~C 4 is alkyl, and R 4 are each independently a linear or branched C 1 ~C 10 Alkyl, preferably linear or branched C 1 ~C 4 alkyl) units; (wherein mol % is calculated based on the total number of moles of units of formula (1) and formula (2)).

[0025] The unit of formula (1) is represented by formula (1'): [ka] (In the formula, R 1 are each independently hydrogen or C 1 ~C 4 -alkyl, R 2 are each independently 1 ~C 4 -alkyl, wherein n is 0, 1, 2, or 3).

[0026] Preferably, the unit of formula (1) has the following formula (1a): [ka] (In the formula, *indicates the position where formula (1a) is attached to the polymer chain), i.e. the unit of formula (1) has the formula (1′a): [ka] It is derived from bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC), having the formula:

[0027] The unit of formula (2) is formula (2'): [ka] (In the formula, R 3 each independently represents H, linear or branched C 1 ~C 10 represents an alkyl group, R 4 are each independently a linear or branched C 1 ~C 10 The alkyl group may be derived from a diphenol having a substituent (e.g., aryl, aryloxy, arylalkyl).

[0028] Preferably, the unit of formula (2) is represented by the following formula (2a): [ka] (In the formula, * indicates the position where formula (2a) is attached to the polymer chain), i.e. the unit of formula (2) is bisphenol A, i.e. formula (2′a): [ka] It is derived from the diphenol

[0029] Preferably, the copolycarbonate comprises units derived from bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) and bisphenol A.

[0030] Preferably, the copolycarbonate does not contain repeat units derived from diphenols other than the diphenols of formula (1') and the diphenols of formula (2').

[0031] Preferably, the copolycarbonate does not contain repeat units derived from diphenols other than bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) and bisphenol A.

[0032] The diphenols of formula (1') and formula (2') are known and can be prepared by methods known from the literature (e.g., HJ Buysch et al., Ullmann's Encyclopedia of Industrial Chemistry, VCH, New York 1991, 5th Ed., Vol. 19, p. 348).

[0033] The molar content of the unit of formula (1) in the copolycarbonate is 42 mol% to 90 mol%, more preferably 44 mol% to 86 mol%, and still more preferably 44 mol% to 80 mol%, based on the total number of moles of the units of formulae (1) and (2).

[0034] The molar content of the unit of formula (2) in the copolycarbonate is 10 mol% to 58 mol%, more preferably 14 mol% to 56 mol%, and still more preferably 20 mol% to 56 mol%, based on the total number of moles of the units of formula (1) and formula (2).

[0035] The copolycarbonates used in the compositions according to the invention are commercially available or may be prepared by methods known in the art.

[0036] For example, the copolycarbonates used in the compositions according to the invention can be prepared by an interfacial process. In particular, the diphenols of formulae (1) and (2) and any branching agent are dissolved in an aqueous alkaline solution and reacted with a carbonate source, such as phosgene, optionally dissolved in a solvent, in a two-phase mixture containing the aqueous alkaline solution, an organic solvent, and a catalyst, preferably an amine compound. The reaction procedure can also be carried out in a multi-stage process.

[0037] The process for preparing such copolycarbonates is in principle known as the two-phase interfacial process, for example in H. Schnell, Chemistry and Physics of Polycarbonates, Polymer Reviews, Vol. 9, Interscience Publishers, New York 1964, page 33 et seq., and in Polymer Reviews, Vol. 10, "Condensation Polymers by Interfacial and Solution Methods", Paul W. Morgan, Interscience Publishers, New York 1965, Chapter VIII, page 325, so that the underlying conditions are well known to the person skilled in the art.

[0038] The concentration of the diphenol in the alkaline aqueous solution is 2% by weight to 25% by weight, preferably 2% by weight to 20% by weight, more preferably 2% by weight to 18% by weight, and even more preferably 3% by weight to 15% by weight. The alkaline aqueous solution is made of water in which an alkali metal or alkaline earth metal hydroxide is dissolved. Sodium hydroxide and potassium hydroxide are preferred.

[0039] The concentration of the amine compound is 0.1 mol % to 10 mol %, preferably 0.2 mol % to 8 mol %, particularly preferably 0.3 mol % to 6 mol %, and more particularly preferably 0.4 mol % to 5 mol %, based on the molar amount of the diphenol used.

[0040] The carbonate source is phosgene, diphosgene, or triphosgene, preferably phosgene. When phosgene is used, the solvent may be optionally omitted and the phosgene may be passed directly into the reaction mixture.

[0041] Tertiary amines such as triethylamine or N-alkylpiperidine may be used as catalysts. Suitable catalysts are trialkylamines and 4-(dimethylamino)pyridine. Triethylamine, tripropylamine, triisopropylamine, tributylamine, triisobutylamine, N-methylpiperidine, N-ethylpiperidine, and N-propylpiperidine are particularly suitable.

[0042] Suitable organic solvents are halogenated hydrocarbons such as methylene chloride, chlorobenzene, dichlorobenzene, trichlorobenzene or mixtures thereof, or aromatic hydrocarbons such as toluene or xylene. The reaction temperature can be from -5°C to 100°C, preferably from 0°C to 80°C, particularly preferably from 10°C to 70°C, very particularly preferably from 10°C to 60°C. It is also possible to prepare copolycarbonates by a melt transesterification process, in which diphenols are reacted with diaryl carbonates, generally diphenyl carbonate, in the melt in the presence of catalysts such as alkali metal salts, ammonium compounds or phosphonium compounds.

[0043] The melt transesterification process is described, for example, in Encyclopedia of Polymer Science, Vol. 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Vol. 9, John Wiley and Sons, Inc. (1964), and in German Patent No. 1031512.

[0044] In the transesterification process, the aromatic dihydroxy compounds already described in the phase boundary process are transesterified in the melt with carbonic acid diesters using suitable catalysts and, optionally, further additives.

[0045] The reaction of the aromatic dihydroxy compounds with the carbonic acid diesters to give the copolycarbonates can be carried out batchwise or, preferably, continuously, for example in stirred tanks, thin film evaporators, falling film evaporators, stirred tank cascades, extruders, kneaders, simple disc reactors and high-viscosity disc reactors.

[0046] Preferably, the copolycarbonate is selected from block copolycarbonates and random copolycarbonates, more preferably, the copolycarbonate is selected from random copolycarbonates.

[0047] Preferably, the copolycarbonates have a weight average molecular weight (Mw) in the range of 16000 g / mol to 40000 g / mol, preferably 17000 g / mol to 32000 g / mol, as determined by gel permeation chromatography (GPC) at 25° C. in methylene chloride with a UV-IR detector using polycarbonate standards.

[0048] An example of a commercially available copolycarbonate suitable for the composition according to the invention is the product sold under the name APEC™ by Covestro Polymer Co., Ltd. (China), which is a polycarbonate copolymer made from the copolymerization of carbonyl chloride with bisphenol A (BPA) and 3,3,5-trimethyl-1,1-bis(4-hydroxyphenyl)cyclohexane (BPTMC).

[0049] Preferably, the copolycarbonate is present in an amount ranging from 60% to 95% by weight, more preferably from 65% to 95% by weight, even more preferably from 70% to 95% by weight, relative to the total weight of the composition according to the invention.

[0050] Component B According to a first embodiment, the polycarbonate composition according to the invention comprises a homopolycarbonate comprising units of formula (2).

[0051] In this application, homopolycarbonate refers to a polycarbonate comprising units of formula (2) as defined above.

[0052] The homopolycarbonate has the formula (2'): [ka] (In the formula, R 3 each independently represents H, linear or branched C 1 ~C 10 Alkyl, preferably linear or branched C 1 ~C 6 Alkyl, more preferably linear or branched C 1 ~C 4 alkyl, even more preferably H or methyl, and R 4 are each independently a linear or branched C 1 ~C 10 Alkyl, preferably linear or branched C 1 ~C 6 Alkyl, more preferably linear or branched C 1 ~C 4 More preferably, the diphenol is derived from a 1,2-diphenyl ether (e.g., 1,3-diphenyl ether, 1,4-diphenyl ether, 1,5-diphenyl ether, 1,6-diphenyl ether, 1,7-diphenyl ether, 1,8-diphenyl ether, 1,9-diphenyl ether, 2,10-diphenyl ether, 2,11-diphenyl ether, 2,20-diphenyl ether

[0053] Preferably, the homopolycarbonate has the formula (2'a): [ka] It is derived from the diphenol, namely bisphenol A.

[0054] The homopolycarbonates used in the compositions according to the invention are commercially available or may be prepared by methods known in the art.

[0055] For example, homopolycarbonates can be produced by reference to the preparation methods described for component A.

[0056] Preferably, the homopolycarbonate has a weight average molecular weight (Mw) in the range of 24000 g / mol to 28000 g / mol as determined by gel permeation chromatography (GPC) at 25° C. in methylene chloride with a UV-IR detector using polycarbonate standards.

[0057] Commercially available homopolycarbonate products suitable for use in the compositions according to the invention include Makrolon™ 2400 and Makrolon™ 2600 sold by Covestro Polymers Co., Ltd. (China).

[0058] Preferably, the homopolycarbonate is present in an amount ranging from 5% to 40% by weight, more preferably from 5% to 35% by weight, even more preferably from 5% to 30% by weight, relative to the total weight of the composition according to the invention.

[0059] Preferably, the weight content of units of formula (1a) in the polycarbonate composition is between 42% and 66% by weight relative to the total weight of the composition according to the invention.

[0060] Additives In addition to the above-mentioned components A and B, the polycarbonate composition according to the present invention may optionally contain one or more additives conventionally used in polycarbonate compositions, such as, for example, fillers, carbon black, UV stabilizers, IR stabilizers, heat stabilizers, antistatic agents, pigments, colorants, lubricants, mold release agents (e.g., pentaerythritol tetrastearate (PETS), glyceryl monostearate (GMS)), antioxidants, flow improvers, flame retardants, etc.

[0061] Such additives are described, for example, in WO 99 / 55772, pages 15 to 25, and in "Plastics Additives", R. Gachter and H. Müller, Hanser Publishers 1983.

[0062] One skilled in the art can select the type of additive so as not to adversely affect the desired properties of the polycarbonate composition according to the present invention.

[0063] The total amount of additives is preferably up to 4% by weight, preferably from 0% to 3% by weight, more preferably from 0% to 2% by weight, based on the total weight of the polycarbonate composition.

[0064] Preferably, the composition according to the invention comprises, relative to the total weight of the composition: a) 60% to 95% by weight of a copolycarbonate, i) 42 mol% to 90 mol% of formula (1a): [ka] With units of ii) 10 mol% to 58 mol% of formula (2a): [ka] With units of (wherein mol % is calculated based on the total number of moles of units of formula (1a) and formula (2a)), b) a homopolycarbonate containing 10% by weight to 40% by weight of a unit of formula (2a); where The weight average molecular weight of the copolycarbonate is in the range of 17000 g / mol to 32000 g / mol; The weight average molecular weight of the homopolycarbonate is in the range of 24000 g / mol to 28000 g / mol, The weight content of the unit of formula (1a) in the polycarbonate composition is 42% by weight to 66% by weight, based on the total weight of the composition; and The total amount of the homopolycarbonate and the copolycarbonate in the composition is 96% by weight to 100% by weight based on the total weight of the composition.

[0065] Preferably, the composition consists of i) a copolycarbonate comprising units derived from bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) and bisphenol A, and ii) a homopolycarbonate comprising units derived from bisphenol A.

[0066] Preparation of polycarbonate compositions The polycarbonate composition according to the invention may be, for example, in the form of pellets.

[0067] The polycarbonate compositions according to the invention exhibit good processing behavior and can be made by a variety of methods, including intimately mixing the materials desired in the composition.

[0068] For example, the materials desired in the composition are first blended in a high speed mixer. Blending can also be accomplished by low shear processes, including but not limited to hand blending. The blend is then fed through a hopper into the throat of a twin screw extruder. Alternatively, at least one component can be incorporated into the composition by feeding it directly into the extruder at the throat and / or downstream through a side stuffer. Additives can also be compounded with the desired polymer resin to obtain a masterbatch and fed into the extruder. The extruder is generally operated at a temperature higher than that required to make the composition flow. The extrudate is immediately quenched in a water bath and pelletized. The pellets can be ¼ inch or less in length as described. Such pellets can be used for subsequent molding, shaping, or forming.

[0069] The melt blending method is preferred due to the availability of melt blending equipment in commercial polymer processing facilities.

[0070] Illustrative examples of equipment used in such melt processing methods include co-rotating and counter-rotating extruders, single screw extruders, co-kneaders, and various other types of extrusion equipment.

[0071] It is preferable to minimize the temperature of the melt during processing to avoid excessive degradation of the polymer. In molten resin compositions, it is often desirable to maintain a melt temperature between 230° C. and 350° C., although higher temperatures can be used if the residence time of the resin in the processing equipment is kept short.

[0072] In some cases, the molten composition exits the processing equipment, such as an extruder, through small exit holes in a die. The resulting strands of molten resin are cooled by passing the strands through a water bath. The cooled strands can be chopped into small pellets for packaging and further handling.

[0073] molded product The polycarbonate compositions according to the invention can be used, for example, to produce various kinds of molded articles.

[0074] In a second aspect, the present invention also provides a molded article made from a polycarbonate composition according to the first aspect of the present invention.

[0075] Examples of such molded articles include, for example, films, profiles, housing parts, e.g., for consumer electronics or office equipment such as monitors, flat screens, notebooks, printers, and copiers, sheets, tubes, conduits, windows, doors, and other profiles for the building sector (interior and exterior applications), electrical and electronic components such as keypads, screen display covers, switches, plugs, and sockets, lenses, and body parts or interior trim for commercial vehicles.

[0076] Fabrication of molded products The polycarbonate compositions according to the present invention can be processed into molded articles by a variety of means, such as injection molding, extrusion, blow molding, or thermoforming to form molded articles.

[0077] In a third aspect, the present invention provides a method of making a molded article made from a composition according to the first aspect of the invention, the method comprising injection molding, extrusion, blow molding or thermoforming a polycarbonate composition according to the invention. EXAMPLES

[0078] The present invention will now be described in detail with reference to the following examples, which are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0079] Materials used Ingredient A CoPC-1: commercially available from Covestro Polymers (China), 7 cm2 measured at 330°C and 1.2 kg according to ISO 1133:2011 3 % bisphenol A units, based on the total amount of bisphenol units, having an MVR of 100 / min and a weight average molecular weight of about 30,000 g / mol, determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0080] CoPC-2: commercially available from Covestro Polymers (China), 16 cm2 measured at 330°C and 1.2 kg according to ISO 1133:2011 3% bisphenol A units, based on the total amount of bisphenol units, having an MVR of 100 / 10 min and a weight average molecular weight of about 27,000 g / mol, determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0081] Component B PC-1: A linear polycarbonate based on bisphenol A, commercially available from Covestro polymers (China), with a weight average molecular weight (Mw) of about 20,000 g / mol, determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0082] PC-2: A linear polycarbonate based on bisphenol A, commercially available from Covestro polymers (China), with a weight average molecular weight of about 24000 g / mol as determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0083] PC-3: A linear polycarbonate based on bisphenol A, commercially available from Covestro polymers (China), with a weight average molecular weight of about 26000 g / mol as determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0084] PC-4: A linear polycarbonate based on bisphenol A, commercially available from Covestro polymers (China), with a weight average molecular weight of about 28000 g / mol as determined by gel permeation chromatography (GPC) in methylene chloride at 25° C. using polycarbonate standards.

[0085] Component C ABS: A core-shell impact modifier available under the trade name P60 from INEOS Styrolution GmbH, made by emulsion polymerization of a mixture of 58% by weight, based on ABS polymer, 24% by weight, based on ABS polymer, and 76% by weight, based on ABS polymer, of linear polybutadiene rubber in the presence of 42% by weight, based on ABS polymer, of polybutadiene.

[0086] Test Method The physical properties of the test specimens in the examples were tested as follows.

[0087] Comparative Tracking Index The comparative tracking index (CTI) was determined according to IEC 60112:2011.

[0088] Transmittance The transmittance for visible light having a wavelength of 390 nm to 780 nm was measured in accordance with ASTM D1003: (2013) using a molded sheet having a thickness of 3 mm in Haze-Guard dual manufactured by BYK-Gardner.

[0089] Vicat softening temperature Vicat softening temperature (T Vicat ) was determined in accordance with ISO 306:(2013) on test specimens with dimensions of 80 mm x 10 mm x 4 mm using a Coesfeld Eco 2920 instrument from Coesfeld Materialtest with a ram load of 50 N and a heating rate of 120 °C / h.

[0090] Melt Volume Flow Rate (MVR) The melt volume flow rate (MVR) was determined according to ISO 1133:2011 using a Zwick 4106 instrument from Roell at 330° C. and a load of 1.2 kg.

[0091] Examples (IE) 1 to 8 of the present invention and Comparative Examples (CE) 1 to 8 The materials listed in Table 1 were compounded and granulated in a twin-screw extruder (ZSK-26) (manufactured by Coperion, Werner and Pfleiderer) at a rotation speed of 225 rpm, a throughput of 20 kg / h, and a machine temperature of 300°C to 330°C.

[0092] The granulate was processed into corresponding test specimens in an injection molding machine (Arburg) at a melt temperature of 330°C and a mold temperature of 60°C.

[0093] The physical properties of the resulting compositions (Comparative Tracking Index (CTI), Melt Volume Flow Rate (MVR), Permeability, and Vicat Softening Temperature (T Vicat ) were tested, and the results are summarized in Table 1.

[0094] [Table 1]

[0095] As used herein, the weight content of BPTMC units in a polycarbonate composition (C BPTMC / C / W ) is calculated as follows: C BPTMC / C / W =(C BPTMC / CO / M ×M wBPTMC )×C co / c / w / (C BPTMC / CO / M ×M wBPTMC’ +C BPA / CO / M ×M wBPA ) (In the formula, C BPTMC / C / W represents the weight content of BPTMC units in the polycarbonate composition, C BPTMC / CO / M represents the molar content of BPTMC units in the copolycarbonate, M wBPTMC represents the molecular weight of the BPTMC unit, expressed in grams per mole, M wBPTMC’ represents the total molecular weight of the BPTMC unit and -C=O-, expressed in grams per mole; C BPA / CO / Mrepresents the molar content of BPA units in the copolycarbonate, M wBPA represents the molecular weight of the BPA unit, expressed in grams per mole, and C co / c / w represents the weight content of the copolycarbonate in the polycarbonate composition).

[0096] Taking Example 1 of the present invention as an example, the molar content of BPTMC units in CoPC-1 is 70 mol%, the molar content of BPA units is 30 mol%, the molecular weight of BPTMC units is 308 g / mol, the total molecular weight of BPTMC units and -C=O- is 336 g / mol, and the molecular weight of BPA units (including -C=O-) is 254 g / mol. CoPC-1 is present in the polycarbonate composition in an amount of 95 wt%, so the weight content of BPTMC units in Example 1 of the present invention is: (70mol%×308g / mol)×95wt% / (70mol%×336g / mol+30mol%×254g / mol)=66wt% It is.

[0097] In Comparative Examples 1-7 and Inventive Examples 1-8, copolycarbonate 1 (CoPC-1) containing 70 mol % BPTMC units was blended with BPA-based polycarbonate in various weight ratios.

[0098] From Table 1, it can be seen that compositions containing CoPC-1 and homopolycarbonate (IE1 to IE8) have a CTI of 600 V or more when the weight ratio of CoPC-1 to homopolycarbonate in each composition is 60 or more:40, the weight average molecular weight of the homopolycarbonate is in the range of 24,000 g / mol to 28,000 g / mol, and the BPTMC content in each composition is in the range of 42 wt% to 80 wt%.

[0099] Furthermore, Table 1 shows that compositions containing CoPC-1 and homopolycarbonate (CE1 to CE7) have a CTI of 250 V or less when the weight ratio of CoPC-1 to homopolycarbonate in the composition is less than 60:40 or the weight average molecular weight of the homopolycarbonate is less than 24,000 g / mol.

[0100] As shown in Comparative Example 8, the pure CoPC-1 resin has a CTI value of 600V and has very poor flow behavior, and therefore poor processability.

[0101] Furthermore, all molded parts made from the compositions of Examples 1 to 8 (IE1 to IE8) of the present invention exhibit high transmittance (greater than 86%) at a thickness of 3 mm and high Vicat temperatures (greater than 180° C.).

[0102] Furthermore, all compositions of Examples 1 to 8 of the present invention (IE1 to IE8) show better melt flow behavior (MVR) compared to the CoPC-1 resin of Comparative Example 8 (CE8).

[0103] Examples (IE) 9 to 11 of the present invention and Comparative Examples (CE) 9 to 14 Similarly, the materials listed in Table 2 were formulated and the resulting compositions were tested for physical properties, with the results summarized in Table 2.

[0104] [Table 2]

[0105] In Comparative Examples 10-14 and Inventive Examples 9-11, copolycarbonate 2 (CoPC-2) containing 47 mol % BPTMC units was blended with BPA-based homopolycarbonate in various weight ratios.

[0106] From Table 2, it can be seen that the compositions containing CoPC-2 and homopolycarbonate in Examples 9 to 11 of the present invention (IE9 to IE11) have a CTI of 600 V or more when the weight ratio of CoPC-2 to homopolycarbonate in the composition is 60 or more:40, the weight average molecular weight of the homopolycarbonate is in the range of 24,000 g / mol to 28,000 g / mol, and the BPTMC content in each composition is in the range of 42 wt% to 80 wt%.

[0107] Furthermore, from Table 2, it can be seen that the compositions containing CoPC-2 and homopolycarbonate in Comparative Examples 10 to 14 (CE10 to CE14) have a CTI in the range of 225V to 325V when the weight average molecular weight of the homopolycarbonate is less than 24,000 g / mol or the BPTMC content in each composition is less than 42% by weight.

[0108] Furthermore, all molded parts made from the compositions of Examples 1 to 8 (IE1 to IE8) of the present invention exhibit high transmittance (greater than 86%) at a thickness of 3 mm and high Vicat temperatures (greater than 180° C.).

[0109] Furthermore, all compositions of Examples 1 to 8 (IE1 to IE8) of the present invention exhibit better melt flow behavior (MVR) compared to CoPC-1 resin.

[0110] As shown in Comparative Example 9, pure CoPC-2 has a CTI value of 600V and has very poor flow behavior, and therefore poor processability.

Claims

1. 1. A polycarbonate composition comprising, by total weight of said composition: a) 60% to 95% by weight of a copolycarbonate, i) 42 mol% to 90 mol% of formula (1): 【Chemistry 1】 (In the formula, ＊ indicates the position where formula (1) is attached to the polymer chain, R １ are each independently hydrogen or C １ ~C ４ is alkyl, R ２ are each independently １ ~C ４ is alkyl, n is 0, 1, 2, or 3; ii) 10 mol % to 58 mol % of formula (2): 【Chemistry 2】 (In the formula, ＊ indicates the position where formula (2) is attached to the polymer chain, R ３ are each independently H, linear or branched C １ ~C １０ is alkyl, and R ４ are each independently a linear or branched C １ ~C １０ and (wherein mol % is calculated based on the total number of moles of units of formula (1) and formula (2)); b) a homopolycarbonate containing from 5% to 40% by weight of units of formula (2) as defined above, wherein The weight average molecular weight of the homopolycarbonate is in the range of 24,000 g / mol to 28,000 g / mol; The weight content of the units of formula (1) in the polycarbonate composition is 42% by weight to 80% by weight, based on the total weight of the composition; and A polycarbonate composition, wherein the total amount of said homopolycarbonate and said copolycarbonate in said composition is from 96% by weight to 100% by weight based on the total weight of said composition.

2. The copolycarbonate has the formula (1'): 【Chemistry 3】 (In the formula, R １ are each independently hydrogen or C １ ~C ４ - represents alkyl, R ２ are each independently １ ~C ４ - represents alkyl, and n represents 0, 1, 2, or 3) and a diphenol of formula (2'): 【Chemistry 4】 (In the formula, R ３ are each independently H, linear or branched C １ ~C １０ represents an alkyl group, R ４ are each independently a linear or branched C １ ~C １０ 2. The composition of claim 1, which is free of units derived from diphenols other than diphenols of the formula (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14), (15), (16), (17), (18), (19), (20), (21), (22), (23), (24), (25), (26), (27),

3. 2. The composition of claim 1, wherein the molar content of units of formula (1) in the copolycarbonate is from 44 mol % to 86 mol %, based on the total number of moles of units of formula (1) and formula (2).

4. 4. The composition of claim 1, wherein the copolycarbonate has a weight average molecular weight (Mw) in the range of 16,000 g / mol to 40,000 g / mol as determined by gel permeation chromatography (GPC) at 25° C. in methylene chloride using polycarbonate standards, and the copolycarbonate is present in an amount in the range of 60% to 95% by weight, based on the total weight of the composition.

5. The composition according to any one of claims 1 to 3, wherein said homopolycarbonate is present in an amount ranging from 5% to 40% by weight relative to the total weight of the composition according to the invention.

6. A molded article made from the composition according to any one of claims 1 to 3.

7. A method for making the molded article of claim 6, comprising injection molding, extrusion, blow molding, or thermoforming the polycarbonate composition of any one of claims 1 to 3.

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