Polycarbonate compositions, articles formed therefrom, and methods of making same

Abstract

The polycarbonate composition includes specific amounts of a bisphenol A homo-polycarbonate and a polycarbonate-siloxane copolymer, the bisphenol A homo-polycarbonate having a weight average molecular weight of 28,000 g / mol or more as determined by gel permeation chromatography with respect to a linear bisphenol A polycarbonate standard, the weight average molecular weight of the bisphenol A homo-polycarbonate being less than or equal to 2,000 g / mol, based on the total weight of the polycarbonate-siloxane copolymer, and the weight average molecular weight of the polycarbonate-siloxane copolymer being less than or equal to 2,000 g / mol. The polycarbonate-siloxane copolymer has a siloxane content of from 30 to 70 weight percent. The composition can provide a desired combination of properties, including good flame retardancy, chemical resistance, and aesthetic properties.

Description

[0001] Citations of Related Applications

[0002] This application claims priority to and the benefit of European Patent Application No. 22197866.1 filed on September 26, 2022, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to polycarbonate compositions, articles formed therefrom, and methods of making the same.The compositions described herein can exhibit advantageous properties such as improved aesthetic properties, flame retardancy, and improved chemical resistance. Background Art

[0004] Polycarbonates are useful in a wide variety of applications, at least in part because of their good balance of properties, such as moldability, heat resistance, and impact properties, among others. Despite extensive research on these materials over the years, there remains a need in the art for improved polycarbonate compositions that meet increasingly stringent industry standards.

[0005] For example, polycarbonate-polysiloxane copolymers can have good mechanical properties and low temperature impact resistance. However, blends of polycarbonate homopolymers with such polycarbonate-polysiloxanes can result in poor aesthetics of molded parts. Aesthetic defects can include excessive haze, limited color space capability, pearlescence, or other surface defects associated with molding, such as streaks and flow lines. Previous attempts to improve aesthetics may compromise other desired properties, such as low temperature impact resistance, flame retardancy, and chemical resistance.

[0006]

[0006] Thus, there remains a need in the art for polycarbonate compositions that may possess balanced aesthetics, flame retardancy, and chemical resistance. Summary of the invention

[0007] One aspect of the present disclosure is a polycarbonate composition comprising: 80 to 90 weight percent of a bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; and 10 to 20 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of 30 to 70 weight percent, based on the total weight of the polycarbonate-siloxane copolymer; wherein the composition comprises less than 5 weight percent of the polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent.

[0008] Another aspect is a method of making a polycarbonate composition comprising melt mixing the components of the composition, and optionally extruding the composition.

[0009] Another aspect is an article comprising the polycarbonate composition.

[0010] The above described and other features are exemplified by the following detailed description. DETAILED DESCRIPTION

[0011] The present inventors have discovered that polycarbonate compositions comprising a specific amount of bisphenol A homopolycarbonate and a polycarbonate-siloxane copolymer having a specific molecular weight can provide a combination of desired properties. For example, compositions according to the present disclosure have been found to exhibit improved aesthetic properties, flame retardancy, flow, and chemical resistance.

[0012] Therefore, one aspect of the present disclosure is a polycarbonate composition. The polycarbonate composition comprises bisphenol A homopolycarbonate. The bisphenol A homopolycarbonate has a repeating structural carbonate unit of formula (1).

[0013]

[0014] Bisphenol A polycarbonate homopolymers can be prepared from bisphenol A ((2,2-bis(4-hydroxyphenyl)propane, or BPA) by methods such as interfacial polymerization and melt polymerization, which are known and described, for example, in WO 2013 / 175448 A1 and WO 2014 / 072923 A1. End-capping agents can be included during polymerization to provide end groups, such as monocyclic phenols such as phenol, p-cyanophenol, and C 1-22 Alkyl substituted phenols such as p-cumylphenol, resorcinol monobenzoate, and p-tert-butylphenol, monoethers of diphenols such as p-methoxyphenol, monoesters of diphenols such as resorcinol monobenzoate, functionalized chlorides of aliphatic monocarboxylic acids such as acryloyl chloride and methacryloyl chloride, and monochloroformates such as phenyl chloroformate, alkyl substituted phenyl chloroformate, p-cumylphenyl chloroformate, and toluene chloroformate. Phenol and p-cumylphenol are specifically mentioned. Combinations of different end-capping agents can be used. Branched polycarbonate blocks can be prepared by adding a branching agent during the polymerization process, such as trimellitic acid, trimellitic anhydride, trimellitic acid chloride, tri-p-hydroxyphenylethane, isatin-bisphenol, trisphenol TC (1,3,5-tris((p-hydroxyphenyl)isopropyl)benzene), trisphenol PA (4(4(1,1-bis(p-hydroxyphenyl)-ethyl)α,α-dimethylbenzyl)phenol), 4-chloroformylphthalic anhydride, trimesic acid, and benzophenonetetracarboxylic acid. The branching agent can be added at a level of 0.05 to 4.0 weight percent (wt%), for example, 0.05 to 2.0 wt%. Combinations including linear polycarbonates and branched polycarbonates can be used. In one aspect, the bisphenol A polycarbonate homopolymer can be a linear bisphenol A polycarbonate homopolymer, optionally end-capped with phenol or p-cumylphenol.

[0015] Bisphenol A homopolycarbonate can have 28,000g / mol or greater, for example 28,000 to 100,000g / mol, or 28,000 to 75,000g / mol, or 28,000 to 40,000g / mol, or 28,000 to 38,000g / mol, or 29,000 to 45,000g / mol weight average molecular weight. Molecular weight can be measured by gel permeation chromatography (GPC) using a crosslinked styrene-divinylbenzene column and calibrated for bisphenol A polycarbonate reference. GPC samples are prepared at a concentration of 1 milligram per milliliter (mg / mL) and eluted at a flow rate of 1.5ml / minute.

[0016] In one aspect, there can be more than one bisphenol A polycarbonate homopolymer. For example, the bisphenol A polycarbonate homopolymer can include a first bisphenol A polycarbonate homopolymer having a first weight average molecular weight and a second bisphenol A polycarbonate homopolymer having a second weight average molecular weight, wherein the first weight average molecular weight and the second weight average molecular weight are different.

[0017] Preferably, the weight average molecular weight of the first bisphenol A polycarbonate homopolymer and the second bisphenol A polycarbonate homopolymer is greater than or equal to 28,000 g / mol. When present, the weight ratio of the first bisphenol A polycarbonate homopolymer having a weight average molecular weight of 28,000 g / mol or more to the second bisphenol A polycarbonate homopolymer having a weight average molecular weight of 28,000 g / mol or more can be 10:1 to 1:10, or 5:1 to 1:5, or 3:1 to 1:3, or 2:1 to 1:2.

[0018] In one aspect, the bisphenol A homopolycarbonate can comprise: a first linear bisphenol A homopolycarbonate having a weight average molecular weight of 32,000 to 38,000 g / mole, preferably 34,000 to 36,000 g / mole, as measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a second linear bisphenol A homopolycarbonate having a weight average molecular weight of 29,000 to 32,000 g / mole, preferably 30,000 to 31,000 g / mole, as measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a combination thereof.

[0019] In one aspect, the composition may optionally include a bisphenol A homopolycarbonate having a weight average molecular weight of less than 28,000 g / mol. For example, the composition may further include a bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol, preferably 20,000 to 22,000 g / mol, as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard. When present, the bisphenol A homopolycarbonate having a weight average molecular weight of less than 28,000 g / mol is present in a weight ratio of bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or more to bisphenol A homopolycarbonate having a molecular weight of less than 28,000 g / mol greater than 1:1, preferably greater than 2:1.

[0020] The weight average molecular weight of the combination of all bisphenol A homopolycarbonates present in the composition is greater than or equal to 28,000 g / mol. In other words, when a bisphenol A homopolycarbonate having a weight average molecular weight of less than 28,000 g / mol is present in the composition, it may be present in an amount such that the weight average molecular weight of the combination of all bisphenol A homopolycarbonates present in the composition is greater than or equal to 28,000 g / mol.

[0021] Based on the total weight of the composition, the bisphenol A homopolycarbonate can be present in the composition in an amount of 80 to 90 weight percent. Within this range, the bisphenol A homopolycarbonate can be present, for example, in an amount of 80 to 87 weight percent, or 80 to 85 weight percent, each based on the total weight of the composition.

[0022] In addition to bisphenol A homopolycarbonate, the composition further comprises a polycarbonate-siloxane copolymer. Polycarbonate-siloxane copolymers are also called polycarbonate-siloxanes. Polycarbonate-siloxane copolymers contain carbonate repeating units and siloxane units. The carbonate units can be derived from dihydroxy aromatic compounds such as bisphenols of formula (2) or diphenols of formula (3):

[0023]

[0024] In formula (2), R a and R b Each independently is C 1-12 Alkyl, C 1-12 Alkenyl, C 3-8 Cycloalkyl, or C 1-12 alkoxy, p and q are each independently 0 to 4, and X a is a single bond, -O-, -S-, -S(O)-, -S(O)2-, -C(O)-, formula -C(R c )(R d )-C 1-11Alkylidene (alkylidene), where R c and R d are independently hydrogen or C 1-10 Alkyl, or -C(=R e )-, wherein R e It is a two-price C 1-10 A hydrocarbon group; and in formula (3), each R h independently a halogen atom such as bromine, C 1-10 Hydrocarbon such as C 1-10 Alkyl, halogen substituted C 1-10 Alkyl, C 6-10 Aryl or halogen substituted C 6-10 aryl, and n is 0 to 4.

[0025] In one aspect, in formulas (2) and (3), R a and R b Each independently is C 1-3 Alkyl or C 1-3 alkoxy, p and q are each independently 0 or 1, and X a is a single bond, -O-, -S(O)-, -S(O)2-, -C(O)-, formula -C(R c )(R d )-C 1-11 Alkylene, where R c and R d are independently hydrogen or C 1-10 Alkyl, each R h are independently bromine, C 1-3 Alkyl, halogen substituted C 1-3 An alkyl group, and n is 0 to 1.

[0026] In one aspect, in formulas (2) and (3), R a and R b Each independently is C 1-3 alkyl, p and q are each independently 0 or 1, and X a is a single bond, -O-, -S(O)-, -S(O)2-, -C(O)-, formula -C(R c )(R d )-C 1-11 Alkylene, where R c and R d are independently hydrogen or C 1-10 Alkyl, each R h are independently bromine, C 1-3 Alkyl, halogen substituted C 1-3 An alkyl group, and n is 0 to 1.

[0027] In one aspect, in formula (2), p and q are each independently 0, and X a is a single bond, -O-, -S(O)-, -S(O)2-, -C(O)-, formula -C(R c )(R d )-C 1-11 Alkylene, where R c and R d are independently hydrogen or C 1-10 alkyl.

[0028] In one aspect, in formula (2), p and q are each independently 0, and X a It is of formula -C(R c )(R d )-C 1-11 Alkylene, where R c and R d are independently hydrogen or C 1-10 alkyl.

[0029] In one aspect, in formula (2), p and q are each independently 0, and X a It is of formula -C(R c )(R d )-C 1-11 Alkylene, where R c and R d Each independently is C 1-10 Alkyl group, preferably methyl group.

[0030] Examples of the bisphenol compound (2) include BPA, 4,4'-dihydroxybiphenyl, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)diphenylmethane, bis(4-hydroxyphenyl)-1-naphthylmethane, 1,2-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2-(4-hydroxyphenyl)-2-(3-hydroxyphenyl)propane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 1,1-bis(hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)isothiazolidine, 1,2-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2-(4-hydroxyphenyl)-2-(3-hydroxyphenyl)propane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, Butene, 1,1-bis(4-hydroxyphenyl)cyclododecane, trans-2,3-bis(4-hydroxyphenyl)-2-butene, 2,2-bis(4-hydroxyphenyl)adamantane, α,α'-bis(4-hydroxyphenyl)toluene, bis(4-hydroxyphenyl)acetonitrile, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3-ethyl-4-hydroxyphenyl)propane, 2,2-bis(3-n-propyl-4-hydroxyphenyl)propane, 2,2-bis(3-isopropyl-4-hydroxyphenyl)propane, 2,2-bis(3-sec-butyl-4-hydroxyphenyl)propane, 2,2-bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl- 4-hydroxyphenyl)propane, 2,2-bis(3-allyl-4-hydroxyphenyl)propane, 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)hexafluoropropane, 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene, 1,1-dibromo-2,2-bis(4-hydroxyphenyl)ethylene, 1,1-dichloro-2,2-bis(5-phenoxy-4-hydroxyphenyl)ethylene, 4,4'-dihydroxybenzophenone, 3,3-bis(4-hydroxyphenyl)-2-butanone, 1,6-bis(4-hydroxyphenyl)-1,6-hexanedione, ethylene glycol bis(4-hydroxyphenyl) ether, bis(4-hydroxyphenyl) ether, bis(4-hydroxyphenyl) The present invention also includes bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfone, 9,9-bis(4-hydroxyphenyl)fluorene, 2,7-dihydroxypyrene, 6,6'-dihydroxy-3,3,3',3'-tetramethylspiro(bis)indane (spirobiindane bisphenol), 3,3-bis(4-hydroxyphenyl)phthalimide, 2,6-dihydroxydibenzo-p-dioxin, 2,6-dihydroxythianthrene, 2,7-dihydroxyphenoxathin, 2,7-dihydroxy-9,10-dimethylphenazine, 3,6-dihydroxydibenzofuran, 3,6-dihydroxydibenzothiophene, and 2,7-dihydroxycarbazole. Combinations comprising different bisphenol compounds may be used.

[0031] Examples of the diphenol compound (3) include resorcinol, substituted resorcinol compounds such as 5-methylresorcinol, 5-ethylresorcinol, 5-propylresorcinol, 5-butylresorcinol, 5-tert-butylresorcinol, 5-phenylresorcinol, 5-cumylresorcinol, 2,4,5,6-tetrafluororesorcinol, 2,4,5,6-tetrabromoresorcinol, etc.; catechol; hydroquinone; substituted hydroquinones such as 2-methylhydroquinone, 2-ethylhydroquinone, 2-propylhydroquinone, 2-butylhydroquinone, 2-tert-butylhydroquinone, 2-phenylhydroquinone, 2-cumylhydroquinone, 2,3,5,6-tetramethylhydroquinone, 2,3,5,6-tetra-tert-butylhydroquinone, 2,3,5,6-tetrafluorohydroquinone, 2,3,5,6-tetrabromohydroquinone, etc. A combination comprising different diphenol compounds may be used.

[0032] In one aspect, the carbonate units may be bisphenol carbonate units derived from a bisphenol of formula (2). A preferred bisphenol is bisphenol A (BPA).

[0033] The siloxane units (also referred to as polysiloxane blocks) optionally have formula (4):

[0034]

[0035] Where each R is independently C 1-13 A monovalent organic group. For example, R can be C 1-13 Alkyl, C 1-13 Alkoxy, C 2-13 Alkenyl, C 2-13 Alkenyloxy, C 3-6 Cycloalkyl, C 3-6 Cycloalkoxy, C 6-14 Aryl, C 6-10 Aryloxy, C 7-13 Arylalkylene, C 7-13 Arylalkylenoxy, C 7-13 Alkyl arylene, or C 7-13 Alkylarylenoxy. The above groups can be fully or partially halogenated with fluorine, chlorine, bromine or iodine, or a combination thereof. In one aspect, when a transparent poly(carbonate-siloxane) is desired, R is not substituted with a halogen. Combinations of the foregoing R groups can be used in the same copolymer.

[0036] In one aspect, R is C 1-3 Alkyl, C 1-3 Alkoxy, C 3-6 Cycloalkyl, C 3-6 Cycloalkoxy, C 6-14 Aryl, C 6-10In one aspect, R is methyl, trifluoromethyl, or phenyl, preferably methyl.

[0037] The value of E in formula (4) can vary widely depending on the type and relative amounts of the components in the polycarbonate composition, the desired properties of the composition, and other considerations. Typically, E has an average value of 2 to 1,000, or 2 to 500, 2 to 200, or 2 to 125, 5 to 80, or 10 to 70. In one aspect, E has an average value of 10 to 80, or 10 to 60, or 10 to 40. In yet another aspect, E has an average value of 40 to 80, or 40 to 70, and in yet another aspect, E has an average value of 10 to 100, or 20 to 60, or 30 to 50.

[0038] In one aspect, the siloxane units have formula (5):

[0039]

[0040] wherein E is as defined above in the context of formula (4); each R may be the same or different and is as defined above in the context of formula (4); and Ar may be the same or different and is substituted or unsubstituted C 6-30 Arylene, wherein the bond is directly attached to the aromatic moiety. The Ar group in formula (5) can be derived from C 6-30 A dihydroxyarylene compound, such as a dihydroxy compound of formula (3). Exemplary dihydroxyarylene compounds are 1,1-bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 1,1-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)n-butane, 2,2-bis(4-hydroxy-1-methylphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, bis(4-hydroxyphenyl sulfide), and 1,1-bis(4-hydroxy-tert-butylphenyl)propane, or combinations thereof.

[0041] Specific examples of the siloxane unit of formula (5) include those of formula (5a) and formula (5b).

[0042]

[0043] In one aspect, the siloxane units have formula (6):

[0044]

[0045] wherein R and E are as described above in the context of formula (4), and each R5 Independently divalent C 1-30 In one aspect, the polydiorganosiloxane block has formula (7):

[0046]

[0047] wherein R and E are as defined above in the context of formula (4). 6 It is a two-price C 2-8 Each M in formula (7) may be the same or different and may be halogen, cyano, nitro, C 1-8 Alkylthio, C 1-8 Alkyl, C 1-8 Alkoxy, C 2-8 Alkenyl, C 2-8 Alkenyloxy, C 3-8 Cycloalkyl, C 3-8 Cycloalkoxy, C 6-10 Aryl, C 6-10 Aryloxy, C 7-12 Aralkyl, C 7-12 Arylalkyleneoxy, C 7-12 Alkyl arylene, or C 7-12 Alkylaryleneoxy, wherein each n is independently 0, 1, 2, 3 or 4.

[0048] In one aspect, M is bromo or chloro, alkyl such as methyl, ethyl or propyl, alkoxy such as methoxy, ethoxy or propoxy, or aryl such as phenyl, chlorophenyl or tolyl; R 6 is dimethylene, trimethylene or tetramethylene; and R is C 1-8 In one aspect, R is methyl, or a combination of methyl and trifluoropropyl, or a combination of methyl and phenyl. In one aspect, R is methyl, M is methoxy, n is 1, and R 6 It is a two-price C 1-3 Aliphatic groups. Specific polydiorganosiloxane blocks have the formula:

[0049]

[0050] or a combination thereof, wherein E has an average value of 10 to 100, preferably 20 to 60, more preferably 30 to 50, or 40 to 50.

[0051] The blocks of formula (7) can be obtained from the corresponding dihydroxy polydiorganosiloxanes by known methods. Polycarbonate-siloxanes can be prepared by introducing phosgene into a mixture of bisphenol and end-capped polydimethylsiloxane (PDMS) under interfacial reaction conditions. Other known methods can also be used.

[0052] In one aspect, the poly(carbonate-siloxane) comprises carbonate units derived from bisphenol A and repeating siloxane units (5a), (5b), (7a), (7b), (7c) or a combination thereof (preferably Formula 7a), wherein E has an average value of 10 to 100, preferably 20 to 80, or 30 to 70, more preferably 30 to 50 or 40 to 50.

[0053] Based on the gross weight of the second polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer can have a siloxane content of 30 to 70 weight percent. Within this range, the polycarbonate-siloxane copolymer can have a siloxane content of 35 to 65 weight percent, or 35 to 60 weight percent, or 30 to 50 weight percent, or 35 to 55 weight percent, or 35 to 45 weight percent. As used in this article, the "siloxane content" of a poly(carbonate-siloxane) refers to the content of siloxane units based on the gross weight of the polycarbonate-siloxane copolymer.

[0054] The polycarbonate-siloxane copolymer can have a weight average molecular weight of 21,000 g / mol to 50,000 g / mol. Within this range, the weight average molecular weight can be 25,000 to 45,000 g / mol, or 30,000 to 45,000 g / mol, or 32,000 to 43,000 g / mol, or 34,000 to 41,000 g / mol, or 35,000 to 40,000 g / mol. The weight average molecular weight can be measured by gel permeation chromatography using a crosslinked styrene-divinylbenzene column at a sample concentration of 1 mg / ml and calibrated with bisphenol A polycarbonate standards.

[0055] The composition comprises less than 5 weight percent, or less than or equal to 1 weight percent, or less than or equal to 0.1 weight percent of a polycarbonate-siloxane having a siloxane content of less than 30 weight percent, or less than 10 weight percent. Preferably, polycarbonate-siloxanes having a siloxane content of less than 30 weight percent, or less than 10 weight percent, are excluded from the composition.

[0056] The polycarbonate-siloxane copolymer can be present in the composition in an amount to provide a total siloxane content of 3 to 14 weight percent, or 3 to 12 weight percent, or 3 to 10 weight percent, or 3 to 8 weight percent, or 3 to 6 weight percent, or 3 to 4 weight percent, or 3 to 7.5 weight percent, or 7.5 to 14 weight percent, each based on the total weight of the polycarbonate composition.

[0057] The polycarbonate-siloxane copolymer can be present in the composition in an amount of 10 to 20 weight percent, based on the total weight of the composition. Within this range, the polycarbonate-siloxane copolymer can be present in an amount of, for example, greater than 12 to 20 weight percent, or 12 to 18 weight percent, or 13 to 17 weight percent, each based on the total weight of the composition.

[0058] In one aspect, one or both of the bisphenol A homopolycarbonate and the polycarbonate-siloxane copolymer can be derived from post-consumer recycled or post-industrial recycled materials. In one aspect, one or both of the bisphenol A homopolycarbonate and the polycarbonate-siloxane copolymer can be produced from at least one monomer derived from bio-based or plastic waste feedstock.

[0059] Polycarbonate composition can further include additive composition optionally, and additive composition comprises one or more additives that are usually incorporated into this type of polymer composition, and condition is to select one or more additives to not significantly adversely affect the desired performance of polycarbonate composition, especially impact resistance, chemical resistance and flame retardancy.Additive can include filler, reinforcing agent, antioxidant, heat stabilizer, light stabilizer, ultraviolet (UV) light stabilizer, plasticizer, lubricant, mold release agent, antistatic agent, colorant such as titanium dioxide, carbon black and organic dye, surface effect additive, radiation stabilizer, flame retardant and anti-dripping agent.Can use the combination of additive, for example the combination of heat stabilizer, mold release agent and ultraviolet light stabilizer.Usually, additive is used with commonly known effective amount.For example, based on the gross weight of polycarbonate composition, the total amount of additive (except any impact modifier, filler or reinforcing agent) can be 0.01 weight percent to 5 weight percent. In one aspect, the polycarbonate composition comprises no more than 5 weight percent, based on the weight of the composition, of a processing aid, a heat stabilizer, an antioxidant, an ultraviolet light absorber, a colorant, or a combination thereof.

[0060] In one aspect, the composition may optionally further comprise a flame retardant. Useful flame retardants may include organic compounds containing phosphorus, bromine or chlorine. For regulatory reasons, non-brominated and non-chlorinated phosphorus-containing flame retardants may be preferred in certain applications, for example, organic phosphates and organic compounds containing phosphorus-nitrogen bonds.

[0061] Flame retardant aromatic phosphates include triphenyl phosphate, tricresyl phosphate, isopropylated triphenyl phosphate, phenyl bis(dodecyl) phosphate, phenyl bis(neopentyl) phosphate, phenyl bis(3,5,5'-trimethylhexyl) phosphate, ethyl diphenyl phosphate, 2-ethylhexyl di(p-tolyl) phosphate, bis(2-ethylhexyl) p-tolyl phosphate, tricresyl phosphate, bis(2-ethylhexyl) phenyl phosphate, tri(nonylphenyl) phosphate, bis(dodecyl) p-tolyl phosphate, dibutylphenyl phosphate, 2-chloroethyl diphenyl phosphate, p-tolyl bis(2,5,5'-trimethylhexyl) phosphate, and 2-ethylhexyl diphenyl phosphate. Difunctional or polyfunctional aromatic phosphorus-containing compounds are also useful, such as resorcinol tetraphenyl diphosphate (RDP), bis(diphenyl) phosphate of hydroquinone, and bis(diphenyl) phosphate of bisphenol A, as well as their oligomeric and polymeric counterparts.

[0062] Flame retardant compounds containing phosphorus-nitrogen bonds include phosphazenes, phosphazene chlorides, phosphorus ester amides, phosphoric acid amides, phosphonic acid amides, phosphinic acid amides, and tris(aziridinyl)phosphine oxide. These flame retardant additives are commercially available.

[0063] Halogenated materials can also be used as flame retardants, such as the following representative bisphenols: 2,2-bis-(3,5-dichlorophenyl)-propane; bis-(2-chlorophenyl)-methane; bis-(2,6-dibromophenyl)-methane; 1,1-bis-(4-iodophenyl)-ethane; 1,2-bis-(2,6-dichlorophenyl)-ethane; 1,1-bis-(2-chloro-4-iodophenyl)-ethane; 1,1-bis-(2-chloro-4-methylphenyl)-ethane; 1,1-bis-(3,5-dichlorophenyl)-ethane; 2,2-bis-(3-phenyl-4-bromophenyl)-ethane; 2,6-bis-(4,6-dichloronaphthyl)-propane; and 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane; 2,2-bis-(3-bromo-4-hydroxyphenyl)-propane. Other halogenated materials include 1,3-dichlorobenzene, 1,4-dibromobenzene, 1,3-dichloro-4-hydroxybenzene, and biphenyls such as 2,2'-dichlorobiphenyl, polybrominated 1,4-diphenoxybenzene, 2,4'-dibromobiphenyl, and 2,4'-dichlorobiphenyl and decabromodiphenyl ether, and oligomeric and polymeric halogenated aromatic compounds such as copolycarbonates of bisphenol A and tetrabromobisphenol A with carbonate precursors (e.g., phosgene). Metal synergists such as antimony oxides can also be used with flame retardants.

[0064] Alternatively, the thermoplastic composition can be substantially free of chlorine and bromine. "Substantially free of chlorine and bromine" is defined as having a bromine or chlorine content of less than or equal to 100 parts per million (ppm), less than or equal to 75 ppm, or less than or equal to 50 ppm by weight, based on the total weight of the composition.

[0065] Inorganic flame retardants such as C 1-16 Salts of alkyl sulfonates, such as potassium perfluorobutanesulfonate (Rimar salt), potassium perfluorooctanesulfonate, tetraethylammonium perfluorohexanesulfonate, and potassium diphenylsulfonesulfonate; salts such as Na2CO3, K2CO3, MgCO3, CaCO3 and BaCO3, or fluoride anion complexes such as Li3AlF6, BaSiF6, KBF4, K3AlF6, KAlF4, K2SiF6 or Na3AlF6.

[0066] When present, the flame retardant can be included in the composition in an amount of 0.01 to 10 weight percent. Within this range, the flame retardant can be present in an amount of 0.1 to 10 weight percent, or 1 to 10 weight percent, or 1 to 8 weight percent, or 2 to 6 weight percent, or 3 to 5 weight percent, each based on the gross weight of the composition. In one aspect, when the flame retardant comprises an inorganic flame retardant, the flame retardant can be present in an amount of 0.05 to 1 weight percent.

[0067] The heat stabilizer additive may include an organic phosphite (e.g., triphenyl phosphite, tris-(2,6-dimethylphenyl)phosphite, tris-(mixed mono- and di-nonylphenyl)phosphite, etc.), a phosphonate (e.g., dimethylphenylphosphonate, etc.), a phosphate (e.g., trimethyl phosphate, etc.), or a combination thereof. The heat stabilizer may be tris(2,4-di-tert-butylphenyl)phosphate available as IRGAPHOS168. The heat stabilizer is typically used in an amount of 0.01 to 5 wt % based on the total weight of the polymer in the composition.

[0068] Light stabilizers or ultraviolet (UV) absorbing additives, also known as UV stabilizers, may also be used. Light stabilizer additives include benzotriazoles such as 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-benzotriazole, and 2-hydroxy-4-n-octyloxybenzophenone, or the like, or combinations thereof.

[0069] UV absorbing additives include hydroxybenzophenones; hydroxybenzotriazoles; hydroxybenzotriazines; cyanoacrylates; oxanilides; benzoxazinones; aryl salicylates; monoesters of diphenols, such as resorcinol monobenzoate; 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol (CYASORB 5411); 2-hydroxy-4-n-octyloxybenzophenone (CYASORB 531); 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy)-phenol (CYASORB 1164); 2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one) (CYASORB UV-3638); poly[(6-morpholinyl-s-triazine-2,4-diyl)[2,2,6,6-tetramethyl-4-piperidinyl)imino]-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino], 2-hydroxy-4-octyloxybenzophenone (UVINUL TM 3008), 6-tert-butyl-2-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenyl (UVINUL TM 3026), 2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)-phenol (UVINUL TM3027), 2-(2H-benzotriazol-2-yl)-4,6-di-tert-amylphenol (UVINUL3028), 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol (UVINUL3029), 1,3-bis[(2'cyano-3',3'-diphenylacryloyl)oxy]-2,2-bis-{[(2'-cyano-3',3'-diphenylacryloyl)oxy]methyl}-propane (UVINUL UL3030), 2-(2H-benzotriazole-2-yl)-4-methylphenol (UVINUL3033), 2-(2H-benzotriazole-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (UVINUL3034), ethyl-2-cyano-3,3-diphenylacrylate (UVINUL3035), (2-ethylhexyl)-2-cyano-3,3-diphenylacrylate (UVINUL3039), N,N'-dimethyl Acyl-N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)hexamethylenediamine (UVINUL4050H), bis-(2,2,6,6-tetramethyl-4-piperidinyl)-sebacate (UVINUL4077H), bis-(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate + methyl-(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate (UVINUL4092H), 1,3-bis[(2 -cyano-3,3-diphenylacryloyl)oxy]-2,2-bis[[(2-cyano-3,3-diphenylacryloyl)oxy]methyl]propane (UVINUL3030); 2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one); 1,3-bis[(2-cyano-3,3-diphenylacryloyl)oxy]-2,2-bis[[(2-cyano-3,3-diphenylacryloyl)oxy]methyl]propane; TINUVIN 234; nano-sized inorganic materials such as titanium oxide, cerium oxide and zinc oxide, each having a particle size of less than or equal to 100 nanometers; or others, or a combination thereof. The UV absorber may be used in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the polycarbonate and the impact modifier.UV absorbers that may be particularly suitable for use in the polycarbonate compositions disclosed herein include 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol (e.g., CYASORB 5411, commercially available from Cytec Industries, Inc., Woodland Park, New Jersey) and 2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one) (e.g., CYASORB UV-3638, commercially available from Cytec Industries, Inc., Woodland Park, New Jersey), or combinations thereof. The UV stabilizer may be present in an amount of 0.01 to 1 wt %, preferably 0.1 to 0.5 wt %, and more preferably 0.15 to 0.4 wt %, based on the total weight of the polycarbonate composition.

[0070] Plasticizers, lubricants or mold release agents may also be used. There is considerable overlap in these types of materials, including, for example, phthalates such as dioctyl-4,5-epoxy-hexahydrophthalate; tris-(octyloxycarbonylethyl) isocyanurate; tristearin; di- or polyfunctional aromatic phosphates such as resorcinol tetraphenyl diphosphate (RDP), bis(diphenyl) phosphate of hydroquinone, and bis(diphenyl) phosphate of bisphenol A; poly-α-olefins; epoxidized soybean oil; silicones, including silicone oils; esters, for example, fatty acid esters such as alkyl stearyl esters, for example, methyl stearate, stearyl stearate, pentaerythritol tetrastearate, and the like; methyl stearate in combination with a hydrophilic and hydrophobic nonionic surfactant comprising a polyethylene glycol polymer, a polypropylene glycol polymer, a poly(ethylene glycol-co-propylene glycol) copolymer, or a combination thereof, for example, methyl stearate and a polyethylene glycol-polypropylene glycol copolymer in a suitable solvent; waxes such as beeswax, montan wax, paraffin wax, and the like.

[0071] Anti-drip agents, such as fibril-forming or non-fibril-forming fluoropolymers such as polytetrafluoroethylene (PTFE), may also be used in the composition. The anti-drip agent may be encapsulated by a rigid copolymer such as styrene-acrylonitrile copolymer (SAN). PTFE encapsulated in SAN is referred to as TSAN. TSAN contains 50 wt% PTFE and 50 wt% SAN, based on the total weight of the encapsulated fluoropolymer. SAN may contain, for example, 75 wt% styrene and 25 wt% acrylonitrile, based on the total weight of the copolymer. The anti-drip agent may be used in an amount of 0.1 to 5 weight percent or 0.1 to 2 weight percent, based on the total weight of the composition.

[0072] In one aspect, the polycarbonate can include a colorant composition. Suitable colorants can include, but are not limited to, those known by their color index, such as solvent green 3, solvent green 28, solvent red 52, solvent red 111, solvent red 135, solvent red 169, solvent red 179, solvent red 207, disperse red 22, vat red 41, solvent orange 60, solvent orange 63, solvent violet 13, solvent violet 14, solvent violet 50, amino ketone black, solvent black 7, nigrosine dye, disperse blue 73, solvent blue 97, solvent blue 101, solvent blue 104, solvent blue 138, disperse yellow 160, solvent yellow 84, solvent yellow 93, solvent yellow 98, solvent yellow 163, solvent yellow 160:1, and mixtures comprising at least one of the foregoing colorants.

[0073] Colorants can be used in amounts and combinations sufficient to darken and opacify the molded article, and more specifically to provide the brightness values ​​described below. The specific amount of the colorant used can depend, among other factors, on its solubility and extinction coefficient in the polycarbonate composition, and whether it is used in combination with one or more additional colorants. Suitable amounts and combinations can be easily determined by one of ordinary skill in the art guided by the present disclosure. The amount of a typical colorant can be, for example, 0.1 to 1 weight percent based on the gross weight of the composition, for example, 0.5 to 1 weight percent based on the gross weight of the composition.

[0074] In one aspect, the colorant composition, when present, can provide the polycarbonate composition with a black color.

[0075] The polycarbonate composition may optionally exclude other components not specifically described herein. For example, the polycarbonate composition may exclude thermoplastic polymers other than bisphenol A homopolycarbonate and polycarbonate-siloxane copolymer. For example, the composition may minimize or exclude polyester (e.g., polyester may be present in an amount of 1 weight percent or less, preferably, wherein polyester is excluded from the composition). The composition may optionally minimize or exclude polycarbonates other than bisphenol A homopolycarbonate and polycarbonate-siloxane copolymer such as polyester-carbonate or bisphenol A copolycarbonate different from polycarbonate-siloxane copolymer. The polycarbonate composition may optionally minimize or exclude impact modifiers, such as impact modifiers based on silicone different from poly (carbonate-siloxane) copolymers, methyl methacrylate-butadiene-styrene copolymers, acrylonitrile-butadiene, styrene copolymers, etc., or combinations thereof. The composition can minimize or exclude halogenated flame retardants, such as brominated flame retardants, including brominated polycarbonates (e.g., polycarbonates containing brominated carbonates include units derived from 2,2',6,6'-tetrabromo-4,4'-isopropylidene diphenol (TBBPA) and carbonate units derived from at least one dihydroxy aromatic compound that is not TBBPA), brominated epoxy resins, etc., or combinations thereof. The composition can optionally exclude phosphorus-containing flame retardants.

[0076] The compositions of the present disclosure can advantageously exhibit one or more desired properties. For example, it was unexpectedly found that the composition can exhibit a low melt volume rate (MVR). For example, the polycarbonate composition can have a melt volume rate (MVR) less than or equal to 10 cm2 measured according to ISO 1133 at 300° C. with a residence time of 300 seconds under a load of 2.16 kg. 3 / 10 minutes of melt volume rate. Despite the relatively low MVR, the polycarbonate composition can further exhibit a low melt viscosity (MV), which indicates that the material is well processable. For example, in one aspect, the polycarbonate composition can have a melt volume rate of 5000 s / 10 minutes according to ISO11443. -1 The melt viscosity is less than 200 Pa-s measured at a shear rate of .

[0077] It has also been unexpectedly discovered that good chemical resistance and aesthetic properties can also be achieved using high siloxane content polycarbonate-siloxane copolymers in combination with bisphenol A homopolycarbonate having a specific molecular weight.

[0078] The composition can have good chemical resistance. In one aspect, after exposure to an insect repellent or sunscreen on an ISO tensile bar at 1% stress at a temperature of 23°C for 72 hours, a molded sample of the polycarbonate composition can have a tensile strain at break of at least 50% of the tensile strain at break of an unexposed reference tested at the same temperature.

[0079] The polycarbonate composition can further exhibit good black color. For example, the polycarbonate composition can have an L* value of less than or equal to 10, or less than or equal to 8, or less than or equal to 7, or less than or equal to 6, as measured by the CIE Lab method, using a 10 degree observation angle, a D65 light source, excluding specular components, and in reflection mode, and using a sample having a thickness of 3.2 mm.

[0080] In one aspect, the composition can also show good flame retardancy. In terms of measuring flame retardancy, the UL94 standard uses the grades of V0, V1, V2 or HB, wherein the grade of V0 is better than V1 or V2 and is required for many applications at the actual component thickness. Using this standard, the polycarbonate composition is formed into a molded article with a given thickness. The thinner the article, the more difficult it is to achieve a grade of V0 or V1. In one aspect, the molded sample of the polycarbonate composition can achieve a UL-94 V0 or V1 grade at a thickness of 1.5 millimeters or less, preferably, a UL-94 grade of V0 or V1 at a thickness of less than or equal to 1.2 millimeters.

[0081] The polycarbonate composition according to the present disclosure may include: 80 to 90 weight percent of bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 or greater as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; and 10 to 20 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of 30 to 70 weight percent based on the total weight of the polycarbonate-siloxane copolymer; wherein the composition contains less than 5 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent. The polycarbonate composition may have a relative humidity of less than or equal to 10 cm2 as measured at 300°C with a residence time of 300 seconds under a load of 2.16 kg according to ISO 1133. 3 / 10 minutes melt volume rate. The bisphenol A homopolycarbonate can have a weight average molecular weight of 29,000 to 45,000 g / mole measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards. The bisphenol A homopolycarbonate can include a first linear bisphenol A homopolycarbonate having a weight average molecular weight of 32,000 to 38,000 g / mole, preferably 34,000 to 36,000 g / mole, measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a second linear bisphenol A homopolycarbonate having a weight average molecular weight of 29,000 to 32,000 g / mole, preferably 30,000 to 31,000 g / mole, measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a combination thereof. The polycarbonate composition may optionally further comprise a bisphenol A homopolycarbonate having a molecular weight of 18,000 g / mol to 24,000 g / mol, preferably 20,000 g / mol to 22,000 g / mol, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, provided that the weight ratio of the bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater to the bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol is greater than 1:1, preferably greater than 2:1. The polycarbonate-siloxane copolymer may have a siloxane content of 35 to 65 weight percent based on the total weight of the polycarbonate-siloxane copolymer. The polycarbonate-siloxane copolymer may comprise bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units. The polycarbonate-siloxane copolymer may have a weight average molecular weight of 21,000 to 50,000 g / mol, or 25,000 to 45,000 g / mol, or 30,000 to 45,000 g / mol, or 32,000 to 43,000 g / mol, or 35,000 to 40,000 g / mol, as determined by gel permeation chromatography using a crosslinked styrene-divinylbenzene column at a sample concentration of 1 mg / ml and calibrated with bisphenol A polycarbonate standards, and the composition may be free of a polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent. The polycarbonate composition may further comprise 0.1 to 10 weight percent of an additive composition, based on the total weight of the polycarbonate composition. Molded samples of the composition exhibit one or more of the following: a UL-94 rating of V0 at a thickness of 1.5 mm or less; preferably, a UL-94 rating of V0 at a thickness of less than or equal to 1.2 mm; an L* value of less than or equal to 10 measured by the CIE Lab method, 10 degree observation angle, D65 illuminant, excluding specular components, in reflection mode; and a tensile strain at break after exposure to a sunscreen or insect repellent that is at least 50% of the tensile strain at break of an unexposed reference sample.

[0082] Polycarbonate compositions can be prepared by various methods known in the art. For example, powdered polycarbonate homopolymers, poly (carbonate-siloxane) and other optional components are first blended with any filler in a high-speed mixer or by manual mixing. The blend is then fed to the throat of a twin-screw extruder through a hopper. Alternatively, it can be fed directly to the extruder by a side filler (sidestuffer) at the feed port and / or downstream, or by mixing it into a masterbatch with the desired polymer and feeding it to the extruder, at least one of the components is incorporated into the composition. The extruder is usually operated at a temperature higher than that necessary to cause the composition to flow. The extrudate can be immediately quenched and granulated in a water bath. As required, the pellets so prepared can be a quarter inch long or less. Such pellets can be used for subsequent molding, shaping or forming.

[0083] Also provided are formed, shaped, cast or molded articles comprising the polycarbonate compositions. The polycarbonate compositions can be molded into useful shaped articles by a variety of methods such as injection molding, extrusion, rotational molding, blow molding and thermoforming. The articles can be molded articles, thermoformed articles, extruded films, extruded sheets, honeycomb structures, one or more layers of multilayer articles, substrates for coating articles, and substrates for metallized articles. Exemplary articles can include computer and business machine housings such as housings for monitors, handheld electronic device housings such as housings for mobile phones, electrical connectors, and components of lighting equipment, decorative objects, household appliances, roofs, greenhouses, solariums, swimming pool enclosures, electronic device housings and signs, etc. In addition, the polycarbonate compositions can be used in such applications as automotive panels and decorations.Examples of suitable articles are illustrated by, but are not limited to, aircraft, automobile, truck, military vehicles (including automobiles, aircraft and marine vehicles), scooters and motorcycle exterior and interior components, including panels, instrument panels, rocker panels, trim, fenders, doors, deck-lids, trunk lids, hoods, hoods, roofs, bumpers, instrument panels, grilles, mirror housings, pillar appliques, cladding, body side moldings, wheel covers, visors, door handles, spoilers, window frames, headlight bezels, headlights, taillights, taillight housings, taillight bezels, license plate housings, roof racks and running boards; shells, exteriors for outdoor vehicles and devices Shells, panels, and components; shells for electrical and telecommunications equipment; outdoor furniture; aircraft components; boats and marine equipment, including trim, shells, and housings; outboard motor housings; depth sounder housings; personal watercraft; jet skis; pools; smart parking assist systems (spas); hot tubs; steps; step coverings; architectural and structural applications such as glazing, roofing, windows, floors, decorative window trim or treatments; treated glass covers for pictures, paintings, posters and similar display items; wall panels and doors; countertops; protected graphics; outdoor and indoor signs; shells, housings, panels, and components for automated teller machines (ATMs); computers; desktop computers housings, housings, panels, and components for lawn and garden tractors, mowers, and tools (including lawn and garden tools); window and door trim; sporting equipment and toys; housings, housings, panels, and components for snowmobiles; recreational vehicle panels and assemblies; playground equipment; shoelaces; articles made of plastic-wood combinations; golf course markings; utility pit covers; lamps; lighting fixtures; network interface device housings; transformer housings; air conditioners Modem housings; cladding or seats for public transportation; cladding or seats for trains, subways, or buses; instrument housings; antenna housings; coverings for satellite dishes; coated helmets and personal protective equipment; coated synthetic or natural textiles; coated painted articles; coated dyed articles; coated fluorescent articles; coated foam articles; medical device housings; battery housings, including battery housings for electric vehicles, electric bicycles, and household and industrial electronics; components of charging equipment for electric vehicles, including wall box housings, connectors, etc.; wireless charging equipment components; electronic equipment protective covers; kitchen appliance components; and similar applications.

[0084] The compositions of the present disclosure can be particularly useful for articles for consumer electronic applications. For example, the article can be a component of a consumer electronic device, such as a game console, a game controller, a portable game device, a cellular phone, a television, a personal computer, a tablet computer, a laptop computer, a personal digital assistant, a portable media player, a digital camera, a portable music player, an electrical appliance, a power tool, a robot, a toy, a greeting card, a home entertainment system, a loudspeaker, or a sound bar. In one aspect, the article can be an electronic housing for an adapter, a mobile phone, a smart phone, a GPS device, a laptop computer, a tablet computer, an e-reader, a copier, or a solar device.

[0085] In one aspect, the article can be a laser welded article. For example, the parts or articles described above can be assembled into an article by laser welding. For example, a method of welding a first article comprising the above-described composition to a second thermoplastic article may include physically contacting at least a portion of the surface of the first article with at least a portion of the surface of the second thermoplastic article, applying laser radiation to the first article, wherein the radiation passes through the first article and the radiation is absorbed by the second article and generates sufficient heat to weld the first article to the second article. The second thermoplastic article may include a variety of thermoplastic polymer compositions that are imparted with laser absorption by means known to those skilled in the art, including the use of additives and / or colorants, such as but not limited to carbon black. Exemplary polymer compositions can include, but are not limited to, olefin polymers, including polyethylene and copolymers and terpolymers thereof, polybutylene and copolymers and terpolymers thereof, polypropylene and copolymers and terpolymers thereof; α-olefin polymers, including linear or substantially linear interpolymers of ethylene and at least one α-olefin and atactic poly(α-olefin); rubber block copolymers; polyamides; polyimides; polyesters, such as poly(arylates), poly(ethylene terephthalate), and poly(butylene terephthalate); vinyl polymers such as polyvinyl chloride and polyvinyl esters such as polyvinyl acetate; acrylic homopolymers, copolymers, and terpolymers; epoxy resins; polycarbonates, polyester-polycarbonates; polystyrenes; poly(arylene ethers), including poly(phenylene ethers); polyurethanes; phenoxy resins; polysulfones; polyethers; acetal resins; polyoxyethylenes; and combinations thereof. More specifically, the polymer is selected from the group consisting of polyethylene, ethylene copolymers, polypropylene, propylene copolymers, polyesters, polycarbonates, polyester-polycarbonates, polyamides, poly(arylene ethers), and combinations thereof. In a specific embodiment, the second article comprises an olefinic polymer, a polyamide, a polyimide, a polystyrene, a polyarylene ether, a polyurethane, a phenoxy resin, a polysulfone, a polyether, an acetal resin, a polyester, a vinyl polymer, an acrylic, an epoxy resin, a polycarbonate, a polyester-polycarbonate, a styrene-acrylonitrile copolymer, or a combination thereof. More specifically, the second article may comprise a polycarbonate homopolymer or copolymer, a polyester homopolymer or copolymer, for example, a poly(carbonate-ester) and a combination thereof. Also disclosed is a laser welded article comprising the thermoplastic composition of the present disclosure in a first component, the first component being laser welded to a second component comprising a second thermoplastic composition as described above.

[0086] The present disclosure is further illustrated by the following examples, which are non-limiting.

[0087] Example

[0088] The materials used in the following examples are shown in Table 1.

[0089] Table 1

[0090]

[0091]

[0092] The components of the composition were mixed and extruded. Moulded parts for physical testing were prepared by injection moulding. The test methods are described in Table 2 below.

[0093] Table 2

[0094]

[0095] The flammability test is conducted according to the procedure of Underwriter's Laboratory Bulletin 94 entitled "Tests for Flammability of Plastic Materials for Parts in Devices and Appliances" (ISBN 0-7629-0082-2), Fifth Edition, dated October 29, 1996, incorporating and including the revised edition of December 12, 2003. Several ratings can be applied based on the burning rate, extinguishing time, ability to resist dripping, and whether the dripping is burned. According to the procedure, the material can be classified as UL94HB, V0, V1, V2, 5VA or 5VB. The test samples are aged at 23°C, 50% RH for more than 2 days or at 70°C for 168 hours before testing. Specifically, in the UL 94 20mm vertical burning flame test, a set of five burning rods are tested. For each rod, the flame is applied to the rod, then removed, and the time required for the rod to self-extinguish (first burnout time, t1) is recorded. The flame is then reapplied and removed, and the time required for the stick to automatically extinguish (second burnout time, t2) and the flame afterglow time (afterglow time, t3) are recorded. To achieve a V-0 rating, the burnout times t1 and t2 of each individual specimen must be less than or equal to 10 seconds; and the total burnout time of all five specimens (t1 plus t2 for all five samples) must be less than or equal to 50 seconds; and the second burnout time plus afterglow time (t2+t3) of each individual specimen must be less than or equal to 30 seconds; and no specimen can burn or burn to the holding fixture; and the cotton indicator cannot be ignited by burning particles or drippings. To achieve a V-1 rating, the burnout time t1 and t2 of each individual specimen must be less than or equal to 30 seconds; and the total burnout time of all five specimens (t1 plus t2 of all five specimens) must be less than or equal to 250 seconds; and the second burnout time plus the afterglow time (t2+t3) of each individual specimen must be less than or equal to 60 seconds; and no specimen can burn or burn to the holding fixture; and the cotton indicator cannot be ignited by burning particles or drippings. To achieve a V-2 rating, the burnout time t1 and t2 of each individual specimen must be less than or equal to 30 seconds; and the total burnout time of all five specimens (t1 plus t2 of all five specimens) must be less than or equal to 250 seconds; and the second burnout time plus the afterglow time (t2+t3) of each individual specimen must be less than or equal to 60 seconds; and no specimen can burn or burn to the holding fixture; but the cotton indicator can be ignited by burning particles or drippings.

[0096] Environmental stress crack resistance (ESCR) describes the accelerated failure of polymeric materials due to the combined effects of environment, temperature and stress. Failure depends primarily on material properties, chemical properties, exposure conditions and the magnitude of stress. ISO tensile bars are clamped to a semicircular fixture to impart a constant strain of 1.0%. These bars are then exposed to chemicals at 23°C for a predefined period of time. After cleaning, tensile properties are measured at 50 mm / min on standard ASTM tensile bars at room temperature according to ASTM D638.

[0097] Examples 1-3

[0098] Table 5 shows the composition and properties of the compositions according to Examples 1-3. As can be seen in Table 5, as the molecular weight of the bisphenol A homopolycarbonate component increases, the color (i.e., L*, a*, and b*) values ​​are unexpectedly improved. The amount of each component is expressed in weight percent based on the total weight of the composition.

[0099] Table 5

[0100]

[0101]

[0102]

[0103] *Indicates comparative example

[0104] Table 5 shows that the use of high molecular weight bisphenol A homopolycarbonate can further provide favorable chemical resistance. When PC-3 was used as the main polycarbonate component (Comparative Example 3), multiple failures were observed at 1% stress after the samples were exposed to insect repellent spray for two days. Similarly, exposure of the composition to sunscreen spray also resulted in early failures of 2 of 5 samples at 1% stress after the samples were exposed for five days. In contrast, homopolycarbonates with higher molecular weights provide improved chemical resistance.

[0105] Embodiment 5-8

[0106] Table 7 shows the composition and performance of the composition according to Examples 5-8. As can be seen in Table 6, when a combination of high molecular weight bisphenol A homopolycarbonate is used, as the molecular weight of the bisphenol A homopolycarbonate component increases, the color (i.e., L*, a*, and b*) values ​​are unexpectedly improved. Interestingly, even when a high amount of dye is included, the color of the composition is observed to be improved (e.g., Example 2 is compared with Example 4, which shows improved color due to changes in coloring agents and loads). Significantly, the L* value can be reduced to less than 10, a "deep black" color, which is usually difficult to achieve. As can be seen from Table 6, the use of a polycarbonate component with a molecular weight of, for example, 26,000 g / mol or greater, or 27,000 g / mol or greater, or 28,000 g / mol or greater can provide the desired L* value of the polycarbonate composition. The amount of each component is expressed in weight percent based on the gross weight of the composition.

[0107] Table 6

[0108]

[0109]

[0110] Embodiment 8-9

[0111] Table 7 shows the components and properties of the compositions according to Examples 8 and 9, comparing different types of PC-Si copolymers (e.g., comparing PC-Si-1 with 20% siloxane and PC-Si-2 with 40% siloxane). The amount of each component is expressed as a weight percent based on the total weight of the composition.

[0112] Table 7

[0113]

[0114]

[0115] *Indicates comparative example

[0116] Table 7 shows that a unique balance of MVR and MV can be achieved when PC-Si-2 is used in combination with a homopolycarbonate having a molecular weight of 28,000 g / mol or greater. Surprisingly, despite the significantly lower MVR, the MV of the composition is comparable, indicating that the compositions of the present disclosure will maintain good processability.

[0117] Based on 5000s -1At the MVR and MV of 1.5 MW and 2.5 MW, Comparative Example 8 is considered to be an excellent injection moldable grade polycarbonate. However, as shown in Table 7, it does not provide the chemical resistance required for certain applications. In contrast, in the case of Example 9, the use of a PC-Si copolymer with a higher siloxane content and a higher molecular weight homopolycarbonate can provide a composition that can advantageously meet certain color requirements and chemical resistance requirements. It should be noted that when observing the MVR alone, it is obvious at a glance that the composition according to Example 9 appears to have lower flowability compared to Comparative Example 8. However, during processing, the flow of the material is better demonstrated by the -1 The MV value at a shear rate of 2000 or higher is shown, where it can be seen that the viscosity of Example 9 differs by only about 10% from that of Comparative Example 8, which will be considered by those skilled in the art to be substantially the same.

[0118] Examples 10-13

[0119] Table 8 shows the compositions according to Examples 10-13 and illustrates the effect of polycarbonate-siloxane content on various properties. As can be seen from Table 8, increasing the PC-Si component reduces the MVR, but the MV has no significant effect, which indicates good processability (and at higher shear, at 5000s -1 and 100s -1 The opposite trend is seen at shear rates, indicating enhanced processability). The data also shows that color deteriorates when increasing the amount of PC-Si, but low L* values ​​can still be achieved. For example, adding PC-Si-2 at a level of 10% to 15% may affect chemical resistance testing, however, the results show that increasing amounts of PC-Si can significantly improve chemical resistance.

[0120] Table 8

[0121]

[0122]

[0123] The present disclosure further encompasses the following aspects.

[0124] Aspect 1: A polycarbonate composition comprising: 80 to 90 weight percent of a bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; and 10 to 20 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of 30 to 70 weight percent based on the total weight of the polycarbonate-siloxane copolymer; wherein the composition comprises less than 5 weight percent of the polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent.

[0125] Aspect 2: The polycarbonate composition of aspect 1, wherein the polycarbonate composition has a thermal conductivity less than or equal to 10 cm2 as measured at 300° C. with a residence time of 300 seconds under a load of 2.16 kg according to ISO 1133. 3 / 10 minutes melt volume rate.

[0126] Aspect 3: The polycarbonate composition of aspect 1 or 2, wherein the polycarbonate composition has a thermal conductivity less than or equal to 10 cm2 as measured at 300° C. with a residence time of 300 seconds under a load of 2.16 kg according to ISO 1133. 3 / 10min melt volume rate, and at 5000s -1 Melt viscosity under shear rate measured according to ISO 11443 at 300°C of less than or equal to 200 Pa*s.

[0127] Aspect 4: The polycarbonate composition of any one of Aspects 1 to 3, wherein the bisphenol A homopolycarbonate has a weight average molecular weight of 29,000 to 45,000 g / mole as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards.

[0128] Aspect 5: The polycarbonate composition of any one of Aspects 1 to 4, wherein the bisphenol A homopolycarbonate comprises a first linear bisphenol A homopolycarbonate having a weight average molecular weight of 32,000 to 38,000 g / mole, preferably 34,000 to 36,000 g / mole, as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a second linear bisphenol A homopolycarbonate having a weight average molecular weight of 29,000 to 32,000 g / mole, preferably 30,000 to 31,000 g / mole, as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a combination thereof.

[0129] Aspect 6: The polycarbonate composition of any one of Aspects 1 to 5, further comprising a bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol, preferably 20,000 to 22,000 g / mol, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, provided that the weight ratio of the bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater to the bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol is greater than 1:1, preferably greater than 2:1.

[0130] Aspect 7: The polycarbonate composition of any one of Aspects 1 to 6, wherein the polycarbonate-siloxane copolymer has a siloxane content of 35 to 65 weight percent based on the total weight of the polycarbonate-siloxane copolymer.

[0131] Aspect 8: The polycarbonate composition of any one of Aspects 1 to 7, wherein the polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units.

[0132] Aspect 9: The polycarbonate composition of any one of Aspects 1 to 8, wherein the polycarbonate-siloxane copolymer has a weight average molecular weight of 21,000 to 50,000 g / mol, or 25,000 to 45,000 g / mol, or 30,000 to 45,000 g / mol, or 32,000 to 43,000 g / mol, or 35,000 to 40,000 g / mol as measured by gel permeation chromatography using a cross-linked styrene-divinylbenzene column at a sample concentration of 1 mg / ml and calibrated with bisphenol A polycarbonate standards.

[0133] Aspect 10: The polycarbonate composition of any of Aspects 1 to 9, wherein the composition is free of a polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent.

[0134] Aspect 11: The polycarbonate composition of any one of Aspects 1 to 10, wherein the polycarbonate composition further comprises 0.1 to 10 weight percent of an additive composition based on the total weight of the polycarbonate composition, preferably, wherein the additive composition comprises an anti-drip agent, a flame retardant, a colorant composition, or a combination thereof, more preferably, wherein the additive composition comprises: 0.05 to 1 weight percent of an inorganic flame retardant, preferably comprising C 1-16 Sulfonate salts, more preferably potassium perfluorobutanesulfonate (Rimar salt), potassium perfluorooctanesulfonate, tetraethylammonium perfluorohexanesulfonate, and potassium diphenylsulfonesulfonate, or combinations thereof; and optionally 0.01 to 1 weight percent of an anti-drip additive.

[0135] Aspect 12: The polycarbonate composition of any of Aspects 1 to 11, wherein a molded sample of the composition further comprises a flame retardant and exhibits a UL-94 rating of V0 at a thickness of 1.5 mm or less; preferably, exhibits a UL-94 rating of V0 at a thickness of less than or equal to 1.2 mm.

[0136] Aspect 13: The polycarbonate composition of any of Aspects 1 to 12, wherein a molded sample of the composition exhibits an L* value less than or equal to 10 measured by the CIE Lab method, 10 degree observation angle, D65 illuminant, excluding specular components, in reflection mode; or a tensile strain at break that is at least 50% of the tensile strain at break of an unexposed reference sample after exposure to a sunscreen or insect repellent; or both.

[0137] Aspect 14: A method of preparing the polycarbonate composition of any of Aspects 1 to 12, the method comprising melt mixing the components of the composition, and optionally extruding the composition.

[0138] Aspect 15: An article comprising the polycarbonate composition of any one of Aspects 1 to 13.

[0139] The compositions, methods and articles may alternatively comprise, consist of or consist essentially of any suitable material, step or component disclosed herein. The compositions, methods and articles may additionally or alternatively be formulated so as to be free of or essentially free of any material (or species), step, or component that is otherwise not necessary for achieving the function or purpose of the compositions, methods and articles.

[0140] All ranges disclosed herein include endpoints, and endpoints can be combined independently of each other. "Combination" includes blends, mixtures, alloys, reaction products, etc. The terms "first", "second", etc. do not represent any order, quantity, or importance, but are used to distinguish one element from another. Unless otherwise specified herein or clearly contradictory to the context, the terms "one" and "a kind of" and "the" do not represent the limitation of quantity, but are interpreted as covering the singular and plural. Unless otherwise clearly stated, "or" refers to "and / or". Mentioning "an aspect" throughout the specification means that the specific elements described in conjunction with the aspect are included in at least one aspect described herein, and may or may not be present in other aspects. The term "their combination" as used in this article includes one or more listed elements, and is open, allowing one or more unnamed similar elements to exist. In addition, it should be understood that the described elements can be combined in any suitable manner in various aspects.

[0141] Unless specified to the contrary herein, all test standards are the most current standards in effect as of the filing date of this application, or, if priority is claimed, the filing date of the earliest priority application in which the test standards appear.

[0142] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. All cited patents, patent applications, and other references are incorporated herein by reference in their entirety. However, if a term in this application contradicts or conflicts with a term in a combined reference, the term from this application takes precedence over the conflicting term from the combined reference.

[0143] Compounds are described using standard nomenclature. For example, any position not substituted by any indicator group is understood to have its valency filled by a bond or hydrogen atom as indicated. A dash ("-") not between two letters or symbols is used to indicate the point of attachment of a substituent. For example, -CHO is connected through the carbon of a carbonyl group.

[0144] As used in this article, the term "alkyl", whether used alone or as a prefix, suffix or fragment of another term, refers to a residue containing only carbon and hydrogen. The residue can be aliphatic or aromatic, straight chain, cyclic, bicyclic, branched, saturated or unsaturated. It can also include a combination of aliphatic, aromatic, straight chain, cyclic, bicyclic, branched, saturated and unsaturated hydrocarbon parts. However, when the alkyl residue is described as substituted, it can optionally include heteroatoms on and above the carbon and hydrogen members of the substituent residue. Therefore, when specifically described as substituted, the alkyl residue can also include one or more carbonyls, amino, hydroxyl, etc., or it can include heteroatoms in the main chain of the alkyl residue. The term "alkyl" refers to a branched or straight chain saturated aliphatic hydrocarbon group, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, sec-pentyl and n-hexyl and sec-hexyl. "Alkenyl" refers to a straight or branched monovalent hydrocarbon group having at least one carbon-carbon double bond (e.g., vinyl (-HC=CH2)). "Alkoxy" refers to an alkyl group attached via an oxygen (i.e., alkyl-O-), such as methoxy, ethoxy, and sec-butoxy. "Alkylene" refers to a straight or branched saturated divalent aliphatic hydrocarbon group (e.g., methylene (-CH2-) or propylene (-(CH2)3-). "Cycloalkylene" refers to a divalent cyclic alkylene group, -C n H 2n-x , wherein x is the number of hydrogens replaced by cyclization. "Cycloalkenyl" refers to a monovalent group having one or more rings and one or more carbon-carbon double bonds in the ring, wherein all ring members are carbon (e.g., cyclopentyl and cyclohexyl). "Aryl" refers to an aromatic hydrocarbon group containing a specified number of carbon atoms, such as phenyl, cycloheptatrienone, indanyl, or naphthyl. "Arylene" refers to a divalent aryl group. "Alkylarylene" refers to an arylene group substituted by an alkyl group. "Arylalkylene" refers to an alkylene group substituted by an aryl group (e.g., benzyl). The prefix "halo" refers to a group or compound including one or more of fluorine, chlorine, bromine, or iodine substituents. There may be a combination of different halogen atoms (e.g., bromine and fluorine) or only chlorine atoms. The prefix "hetero" refers to a compound or group including at least one ring member that is a heteroatom (e.g., 1, 2, or 3 heteroatoms), wherein the heteroatoms are each independently N, O, S, Si, or P. "Substituted" means that the compound or group is substituted with at least one (e.g., 1, 2, 3, or 4) substituents, each of which is independently C 1-9 Alkoxy, C1-9 Haloalkoxy, nitro (-NO2), cyano (-CN), C 1-6 Alkylsulfonyl (-S(=O)2-alkyl), C 6-12 Arylsulfonyl (-S(=O)2-aryl), thiol (-SH), thiocyanate (-SCN), tosyl (CH3C6H4SO2-), C 3-12 Cycloalkyl, C 2-12 Alkenyl, C 5-12 Cycloalkenyl, C 6-12 Aryl, C 7-13 Arylalkylene, C 4-12 Heterocycloalkyl and C 3-12 Heteroaryl, provided that the normal valence of the substituted atom is not exceeded. The number of carbon atoms indicated in the group does not include any substituents. For example, -CH2CH2CN is a C2 alkyl group substituted with a nitrile.

[0145] Although specific embodiments have been described, the applicant or other persons skilled in the art may conceive of alternatives, modifications, variations, improvements, and substantial equivalents that are not currently foreseeable or may not be foreseeable. Therefore, the appended claims as filed and as they may be amended are intended to cover all such alternatives, modifications, variations, improvements, and substantial equivalents.

Claims

1. A polycarbonate composition comprising: 80 to 90 weight percent of a bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; and 10 to 20 weight percent of a polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer having a siloxane content of 30 to 70 weight percent based on the total weight of the polycarbonate-siloxane copolymer; in, The composition comprises less than 5 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of less than 30 weight percent.

2. The polycarbonate composition according to claim 1, wherein The polycarbonate composition has a thermal conductivity of less than or equal to 10 cm2 as measured at 300° C. with a residence time of 300 seconds under a load of 2.16 kg according to ISO 1133. 3 / 10 minutes melt volume rate.

3. The polycarbonate composition according to claim 1 or 2, wherein The polycarbonate composition has a thermal conductivity of less than or equal to 10 cm2 as measured at 300° C. with a residence time of 300 seconds under a load of 2.16 kg according to ISO 1133. 3 / 10min melt volume rate, and at 5000s -1 Melt viscosity under shear rate measured according to ISO 11443 at 300°C of less than or equal to 200 Pa*s.

4. The polycarbonate composition according to any one of claims 1 to 3, wherein The bisphenol A homopolycarbonate has a weight average molecular weight of 29,000 to 45,000 g / mole as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards.

5. The polycarbonate composition according to any one of claims 1 to 4, wherein The bisphenol A homopolycarbonate comprises: a first linear bisphenol A homopolycarbonate having a weight average molecular weight of 32,000 to 38,000 g / mole, preferably 34,000 to 36,000 g / mole, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; or a second linear bisphenol A homopolycarbonate having a weight average molecular weight of 29,000 to 32,000 g / mole, preferably 30,000 to 31,000 g / mole, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; or A combination of them.

6. The polycarbonate composition of any one of claims 1 to 5, further comprising a bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol, preferably 20,000 to 22,000 g / mol, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, provided that the weight ratio of the bisphenol A homopolycarbonate having a weight average molecular weight of 28,000 g / mol or greater to the bisphenol A homopolycarbonate having a molecular weight of 18,000 to 24,000 g / mol is greater than 1:1, preferably greater than 2:

1.

7. The polycarbonate composition according to any one of claims 1 to 6, wherein The polycarbonate-siloxane copolymer has a siloxane content of 35 to 65 weight percent based on the total weight of the polycarbonate-siloxane copolymer.

8. The polycarbonate composition according to any one of claims 1 to 7, wherein The polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units.

9. The polycarbonate composition according to any one of claims 1 to 8, wherein The polycarbonate-siloxane copolymer has a weight average molecular weight of 21,000 to 50,000 g / mol, or 25,000 to 45,000 g / mol, or 30,000 to 45,000 g / mol, or 32,000 to 43,000 g / mol, or 35,000 to 40,000 g / mol, as determined by gel permeation chromatography using a cross-linked styrene-divinylbenzene column at a sample concentration of 1 mg / ml and calibrated with bisphenol A polycarbonate standards.

10. The polycarbonate composition according to any one of claims 1 to 9, wherein The composition is free of polycarbonate-siloxane copolymers having a siloxane content of less than 30 weight percent.

11. The polycarbonate composition according to any one of claims 1 to 10, wherein The polycarbonate composition further comprises 0.1 to 10 weight percent of an additive composition based on the total weight of the polycarbonate composition, Preferably, wherein the additive composition comprises an anti-drip agent, a flame retardant, a colorant composition or a combination thereof, More preferably, the additive composition comprises: 0.05 to 1 weight percent of an inorganic flame retardant, preferably comprising C 1-16 Sulfonates, more preferably potassium perfluorobutanesulfonate (Rimar salt), potassium perfluorooctanesulfonate, tetraethylammonium perfluorohexanesulfonate, and potassium diphenylsulfonesulfonate, or combinations thereof; and Optionally 0.01 to 1 weight percent of an anti-drip additive.

12. The polycarbonate composition according to any one of claims 1 to 11, wherein The polycarbonate composition further comprises a flame retardant and a molded sample of the composition exhibits a UL-94 rating of V0 at a thickness of 1.5 mm or less; preferably, exhibits a UL-94 rating of V0 at a thickness of less than or equal to 1.2 mm.

13. The polycarbonate composition according to any one of claims 1 to 12, wherein a molded sample of the composition exhibits an L* value less than or equal to 10 as measured by the CIE Lab method, 10 degree observation angle, D65 illuminant, excluding specular components, in reflective mode; or a tensile strain at break that is at least 50% of the tensile strain at break of an unexposed reference sample after exposure to the sunscreen or insect repellent; Or both.

14. A method of preparing the polycarbonate composition of any one of claims 1 to 12, the method comprising melt mixing the components of the composition, and optionally extruding the composition.

15. An article comprising the polycarbonate composition of any one of claims 1 to 13.

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