Polycarbonate compositions, methods for making same, and articles made therefrom

Abstract

A polycarbonate composition includes specific amounts of a polycarbonate, a polycarbonate-siloxane copolymer, a triazine-containing UV absorber, and a phosphazene flame retardant. The composition can provide a desired combination of properties. The invention also discloses a method for manufacturing the composition and an article comprising the composition.

Description

[0001] Related Applications

[0002] This application claims priority to and the benefit of European Patent Application No. 22188548.6 filed on August 3, 2022, the contents of which are incorporated herein by reference in their entirety. Background Art

[0003] The present disclosure relates to polycarbonate compositions, methods for making the same, and articles comprising the polycarbonate compositions.

[0004] Polycarbonates can be used to make articles and parts for a wide range of applications, from automotive parts to electronic appliances. Due to their widespread use, it is desirable to provide polycarbonates with improved weatherability and flame resistance. Previous efforts to reduce weathering have included coatings with high concentrations of UV absorbing additives. It would be advantageous to provide polycarbonate compositions that are able to resist weathering without the need for a separate coating.

[0005] Therefore, there remains a need in the art for thermoplastic compositions having improved weathering properties and fire resistance. It would be a further advantage if the thermoplastic composition had good low temperature impact resistance. Summary of the invention

[0006] The polycarbonate composition comprises 40 to 88.9 weight percent of polycarbonate; 10 to 30 weight percent of a polycarbonate-siloxane copolymer, wherein the polycarbonate-siloxane copolymer contains 5 to 40 weight percent of siloxane based on the total weight of the polycarbonate-siloxane copolymer; 0.1 to 5 weight percent of a triazine-containing UV absorber; and 1 to 10 weight percent of a phosphazene flame retardant; wherein the weight percent of each component is based on the total weight of the composition.

[0007] A method of making a polycarbonate composition comprises melt mixing the components of the composition, and optionally, extruding the composition.

[0008] Another aspect is an article comprising the composition.

[0009] The above described and other features are exemplified by the following detailed description. DETAILED DESCRIPTION

[0010] The present inventors have found that a desired combination of properties can be obtained using a polycarbonate composition having specific amounts of polycarbonate, polycarbonate-siloxane copolymer, triazine-containing UV absorber, and phosphazene flame retardant. The resulting composition can advantageously exhibit a combination of good UV resistance, flame retardancy, and low temperature impact properties. Therefore, the present disclosure provides significant improvements.

[0011] Therefore, one aspect of the present disclosure is a polycarbonate composition. The polycarbonate composition comprises polycarbonate. As used herein, "polycarbonate" refers to a homopolymer or copolymer having a repeating structural carbonate unit of formula (1):

[0012]

[0013] Among them, R 1 At least 60% of the total number of radicals are aromatic, or each R 1 Contains at least one C 6-30 Preferably, each R 1 It may be derived from a dihydroxy compound, such as an aromatic dihydroxy compound of formula (2) or a bisphenol of formula (3).

[0014]

[0015] In formula (2), each R h is independently a halogen atom (e.g., bromine), such as C 1-10 Alkyl C 1-10 Hydrocarbyl groups, halogen-substituted C 1-10 Alkyl, C 6-10 Aryl or halogen substituted C 6-10 aryl, and n is 0 to 4.

[0016] In formula (3), R a and R b are independently halogen, C 1-12 Alkoxy, or C 1-12 alkyl, and p and q are each independently an integer from 0 to 4, such that when p or q is less than 4, the valence of each carbon of the ring is filled by hydrogen. In one aspect, p and q are each 0, or p and q are each 1, and R a and R b Each is C 1-3 An alkyl group, preferably a methyl group, is disposed meta to the hydroxyl group on each arylene group. a is a bridging group connecting two hydroxy-substituted aromatic groups, wherein the bridging group and the hydroxy substituent of each C6 arylene group are arranged ortho, meta, or para (preferably para) to each other on the C6 arylene group, for example, the bridging group is a single bond, -O-, -S-, -S(O)-, -S(O)2-, -C(O)-, or C 1-18 An organic group, which may be cyclic or acyclic, aromatic or non-aromatic, and may further contain heteroatoms such as halogen, oxygen, nitrogen, sulfur, silicon, or phosphorus. For example, X a Can be substituted or unsubstituted C 3-18 Cycloalkylidene; Formula -C(R c)(R d )-C 1-25 Alkylene, where R c and R d are independently hydrogen, C 1-12 Alkyl, C 1-12 Cycloalkyl, C 7-12 Aralkyl, C 1-12 Heteroalkyl, or cyclic C 7-12 Heteroaralkyl; or -C(=R e )-, wherein R e It is a two-price C 1-12 Hydrocarbon.

[0017] Examples of the bisphenol compound include 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)isobutylene. olefins, 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) bis(4-hydroxyphenyl) ether, 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-dihydroxyphenoxyphenoxathiol, 2,7-dihydroxy-9,10-dimethylphenazine, 3,6-dihydroxydibenzofuran, 3,6-dihydroxydibenzothiophene, and 2,7-dihydroxycarbazole; 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; 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. ;

[0018] Specific dihydroxy compounds include resorcinol, 2,2-bis(4-hydroxyphenyl)propane ("bisphenol A" or "BPA"), 3,3-bis(4-hydroxyphenyl)phthalimide, 2-phenyl-3,3'-bis(4-hydroxyphenyl)phthalimide (also known as N-phenylphenolphthalein bisphenol, "PPPBP", or 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one), 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (isophorone bisphenol).

[0019] In one aspect, the polycarbonate comprises a bisphenol A polycarbonate homopolymer, also referred to as bisphenol A homopolycarbonate. The bisphenol A polycarbonate homopolymer has carbonate units of a repeating structure of formula (4).

[0020]

[0021] 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 may be included during polymerization to provide end groups, for example, monocyclic phenols such as phenol, p-cyanophenol; and C 1-22Alkyl-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 may be used. Branched polycarbonate blocks can be prepared by adding a branching agent during the polymerization process, such as trimellitic acid, trimellitic anhydride, trimellitic trichloride, 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.

[0022] The bisphenol A polycarbonate homopolymer can be a linear bisphenol A polycarbonate homopolymer, optionally end-capped with phenol or p-cumylphenol, and having a weight average molecular weight of 10,000 to 100,000 grams per mole (g / mol), preferably 15,000 to 40,000 g / mol, measured by gel permeation chromatography (GPC) using a crosslinked styrene-divinylbenzene column and calibrated against a bisphenol A polycarbonate reference. The GPC sample is prepared at a concentration of 1 milligram per milliliter (mg / mL) and eluted at a flow rate of 1.5 ml per minute. The bisphenol A polycarbonate homopolymer can include a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 grams per mole, preferably 17,000 to 25,000 grams per mole, as determined by GPC. The bisphenol A polycarbonate homopolymer may include a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of about 26,000 to about 40,000 g / mol, for example about 27,000 to about 35,000 g / mol, the weight average molecular weight being measured by GPC.

[0023] 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 weight average molecular weight of 15,000 to 25,000 g / mol, or 17,000 to 23,000 g / mol, or 18,000 to 22,000 g / mol, and a second bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mol, or 26,000 to 35,000 g / mol, each measured by GPC using a BPA homopolycarbonate standard. The weight ratio of the first bisphenol A polycarbonate homopolymer to the second bisphenol A polycarbonate homopolymer can be 10:1 to 1:10, such as 5:1 to 1:5, or 3:1 to 1:3, or 2:1 to 1:2.

[0024] The polycarbonate can be present in an amount of 40 to 88.9 weight percent, based on the total weight of the polycarbonate composition. Within this range, the polycarbonate can be present in an amount of 45 to 85 weight percent, or 50 to 80 weight percent, or 55 to 85 weight percent, or 50 to 80 weight percent, or 60 to 85 weight percent, or 65 to 82 weight percent.

[0025] In addition to polycarbonate, the composition includes a polycarbonate-siloxane copolymer. Polycarbonate-siloxane copolymers are also called polycarbonate-siloxanes. Polycarbonate-siloxane copolymers include carbonate repeating units and siloxane units. As described above, the carbonate units can be derived from an aromatic dihydroxy compound of formula (2) or a bisphenol of formula (3).

[0026] In one aspect, the carbonate units may be bisphenol carbonate units derived from a bisphenol of formula (3). A preferred bisphenol is BPA.

[0027] The siloxane units (also referred to as polysiloxane blocks) are optionally of formula (5):

[0028]

[0029] 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 Arylalkyleneoxy, C 7-13 Alkyl arylene, or C7-13 Alkyl aryleneoxy. The above groups can be completely 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.

[0030] 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 6-10 In one aspect, R is methyl, trifluoromethyl, or phenyl, preferably methyl.

[0031] The value of E in formula (5) can vary widely, depending on the type and relative amount of each component in the polycarbonate composition, the desired properties of the composition, and the like. 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 40, in 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.

[0032] In one aspect, the siloxane unit is of formula (6):

[0033]

[0034] wherein E is as defined above in the context of formula (5); each R may be the same or different and is as defined above in the context of formula (5); 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 (6) may be derived from C 6-30 A dihydroxyarylene compound, such as a dihydroxy compound of formula (2). 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 a combination thereof.

[0035] Specific examples of the siloxane unit of formula (6) include those of formula (6a) and formula (6b).

[0036]

[0037] In one aspect, the siloxane unit is of formula (7):

[0038]

[0039] wherein R and E are as described above in the context of formula (5), and each R 5 Independently divalent C 1-30 In one aspect, the polydiorganosiloxane block is of formula (8):

[0040]

[0041] wherein R and E are as defined above in the context of formula (5). 6 It is a two-price C 2-8 Each M in formula (8) 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.

[0042] 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 1-3The specific polydiorganosiloxane block is of the formula

[0043]

[0044]

[0045] 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.

[0046] The blocks of formula (8) can be derived 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.

[0047] In one aspect, the poly(carbonate-siloxane) comprises carbonate units derived from bisphenol A, and repeating siloxane units (6a), (6b), (8a), (8b), (8c), or a combination thereof (preferably Formula 8a), 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.

[0048] Based on the gross weight of the polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer can have a siloxane content of 5 to 40 weight percent. Within this range, the polycarbonate-siloxane copolymer can have a siloxane content of 10 to 40 weight percent, or greater than 10 to 40 weight percent, or 15 to 40 weight percent, or 10 to 30 weight percent, or greater than 10 to 30 weight percent, or 15 to 25 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.

[0049] The polycarbonate-siloxane copolymer may have a weight average molecular weight of 18,000 g / mol to 50,000 g / mol, preferably 25,000 g / mol to 40,000 g / mol, more preferably 27,000 g / mol to 32,000 g / mol, as measured by gel permeation chromatography using a cross-linked styrene-divinylbenzene column at a sample concentration of 1 mg per milliliter and calibrated using a bisphenol A polycarbonate standard.

[0050] In one aspect, the composition comprises less than or equal to 5 weight percent, or less than or equal to 1 weight percent, or less than or equal to 0.1 weight percent polycarbonate-siloxane, and the polycarbonate-siloxane has a siloxane content of less than 10 weight percent. Preferably, polycarbonate-siloxanes with a siloxane content of less than 10 weight percent are excluded from the composition. In one aspect, the composition comprises less than or equal to 5 weight percent, or less than or equal to 1 weight percent, or less than or equal to 0.1 weight percent polycarbonate-siloxane, and the polycarbonate-siloxane has a siloxane content greater than 30 weight percent. Preferably, polycarbonate-siloxanes with a siloxane content greater than 30 weight percent are excluded from the composition.

[0051] The polycarbonate-siloxane copolymer can be present in the composition in an amount to provide a total siloxane content of 0.5 to 20 weight percent, or 1 to 10 weight percent, or 1 to 8 weight percent, or 1 to 6 weight percent, or 1.5 to 4 weight percent, each based on the total weight of the polycarbonate composition.

[0052] The polycarbonate-siloxane copolymer can be present in the composition in an amount of 10 to 30 weight percent, based on the total weight of the polycarbonate composition. Within this range, the polycarbonate-siloxane copolymer can be present in an amount of 12 to 28 weight percent, or 15 to 25 weight percent, or 17 to 23 weight percent, or 18 to 22 weight percent.

[0053] In addition to the polycarbonate and the polycarbonate-siloxane copolymer, the polycarbonate composition further comprises a triazine-containing UV absorber. In one aspect, the triazine-containing UV absorber may include a triaryl-1,3,5-triazine UV absorber. The triazine-containing UV absorber has a triazine core.

[0054]

[0055] These include, for example, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol (CAS Reg. No. 147315-50-2, commercially available as CHIGUARD 5577 from Chitec Technology), and 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy)phenol (CAS Reg. No. 2725-22-6, commercially available as CHIGUARD 1064 from Chitec Technology).

[0056] In specific aspects, the triazine-containing UV absorber can include 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-[(hexyl)oxy]-phenol, 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl]-5-(octyloxy)phenol, or a combination thereof, preferably 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-[(hexyl)oxy]-phenol.

[0057] The triazine-containing UV absorber can be present in the composition in an amount of 0.1 to 5 weight percent, based on the total weight of the composition. Within this range, the triazine-containing UV absorber can be present in an amount of 0.1 to 4 weight percent, or 0.1 to 3 weight percent, or 0.1 to 2 weight percent, or 0.5 to 3 weight percent, or 0.5 to 2 weight percent, or 0.5 to 1.5 weight percent.

[0058] The composition may minimize or exclude other UV absorbers. For example, the composition may contain less than 1 weight percent, or less than 0.5 weight percent, or less than 0.1 weight percent, or less than 0.05 weight percent, or less than 0.01 weight percent of UV absorbers other than triazine-containing UV absorbers. In one aspect, the composition may contain less than 1 weight percent, or less than 0.5 weight percent, or less than 0.1 weight percent, or less than 0.05 weight percent, or less than 0.01 weight percent of benzotriazole-containing UV absorbers. As used herein, "benzotriazole-containing UV absorbers" refer to those containing a benzotriazole nucleus.

[0059]

[0060] These include, for example, 2-(2-hydroxy-3,5-di-cumyl)benzotriazole (CAS Reg. No. 70321-86-7, commercially available as TINUVIN 234 from BASF), and 2,2'-methylene-bis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl))phenol (CAS Reg. No. 103597-45-1, commercially available as TINUVIN 360 from BASF or as CHIGUARD 5431 from Chitec Technology).

[0061] The polycarbonate composition further comprises a phosphazene flame retardant. Specifically, phosphazene (9) and cyclophosphazene (10) can be used.

[0062]

[0063] wherein w1 is 3 to 10,000 and w2 is 3 to 25, preferably 3 to 7, and each R wIndependently C 1-12 In the above groups, at least one hydrogen atom in these groups may be substituted by a group having N, S, O, or F atoms, or an amino group. For example, each R w It may be a substituted or unsubstituted phenoxy, amino, or polyoxyalkylene group. w It can also be a crosslink with another phosphazene group. Exemplary crosslinks include bisphenol groups, such as bisphenol A groups. Examples include phenoxycyclotriphosphazenes, octaphenoxycyclotetraphosphazenes, decaphenoxycyclopentaphosphazenes, and the like. Combinations of different phosphazenes can be used. A number of phosphazenes and their synthesis are described in HR Allcook, "Phosphorus-Nitrogen Compounds" Academic Press (1972), and JE Mark et al., "Inorganic Polymers" Prentice-Hall International, Inc. (1992).

[0064] In one aspect, the phosphazene flame retardant may include cyclic phosphazenes. In one aspect, the phosphazene flame retardant includes phenoxy cyclotriphosphazenes, octaphenoxy cyclotetraphosphazenes, decaphenoxy cyclopentaphosphazenes, hexaphenoxy cyclotriphosphazenes, or a combination thereof. In one aspect, the phosphazene may include hexaphenoxy cyclotriphosphazenes.

[0065] The phosphazene flame retardant can be present in an amount of 1 to 10 weight percent, based on the total weight of the composition. Within this range, the phosphazene flame retardant can be present in an amount of 2 to 8 weight percent, or 2 to 6 weight percent, or 2 to 5 weight percent, or 2.5 to 4.5 weight percent, or 3 to 4 weight percent.

[0066] The polycarbonate composition may optionally further include an additive composition containing one or more additives that are usually incorporated into this type of polymer composition, provided that the selection of one or more additives does not significantly adversely affect the desired properties of the polycarbonate composition. The additive may include fillers, reinforcing agents, antioxidants, heat stabilizers, light stabilizers, plasticizers, lubricants, mold release agents, antistatic agents, colorants (such as titanium dioxide, carbon black and organic dyes), surface effect additives, radiation stabilizers, flame retardants and anti-dripping agents. A combination of additives may be used, such as a combination of heat stabilizers, mold release agents and ultraviolet light stabilizers. Typically, additives are used in a known effective amount. For example, based on the gross weight of the polycarbonate composition, the total amount of additives (except any impact modifier, filler or reinforcing agent) may be 0.1 to 10 weight percents. In one aspect, based on the weight of the composition, the polycarbonate composition includes processing aids, heat stabilizers, antioxidants, colorants or combinations thereof that are no more than 5 weight percents.

[0067] The polycarbonate composition may optionally exclude other components not specifically described herein. For example, the polycarbonate composition may exclude thermoplastic polymers other than polycarbonate (e.g., bisphenol A homopolycarbonate), and polycarbonate-siloxane copolymers. For example, the composition may minimize or exclude polyesters (e.g., polyesters may be present in an amount of 1 weight percent or less, preferably, wherein polyesters are excluded from the composition). The composition may optionally exclude polycarbonates other than bisphenol A homopolycarbonate and polycarbonate-siloxane copolymers having a siloxane content of 10 to 30 weight percent based on the total weight of the polycarbonate-siloxane copolymer. For example, polyester-carbonates or bisphenol A copolycarbonates different from polycarbonate-siloxane copolymers may be minimized or excluded from the composition (e.g., may be present in an amount of 1 weight percent or less, preferably excluded from the composition). The polycarbonate composition may optionally exclude an impact modifier, such as a silicone impact modifier other than a poly(carbonate-siloxane) copolymer, a methyl methacrylate-butadiene-styrene copolymer, an acrylonitrile-butadiene, styrene copolymer, etc., or a combination thereof. The composition may exclude a halogenated flame retardant, such as a brominated flame retardant, including a brominated polycarbonate (e.g., a polycarbonate containing a brominated carbonate includes 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), a brominated epoxy resin, etc., or a combination thereof. The composition may optionally exclude an inorganic flame retardant.

[0068] In one aspect, the total amount of polycarbonate (e.g., bisphenol A homopolycarbonate), polycarbonate-siloxane copolymer, triazine-containing UV absorber, and phosphazene flame retardant is at least 80 weight percent, or at least 85 weight percent, or at least 90 weight percent, or at least 93 weight percent, or at least 95 weight percent, or at least 96 weight percent of the total weight of the polycarbonate composition.

[0069] In a specific aspect, the polycarbonate composition can include 65 to 82 weight percent of polycarbonate; 15 to 25 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of 10 to 30 weight percent based on the total weight of the polycarbonate-siloxane copolymer; 0.5 to 2 weight percent of a triazine-containing UV absorber; and 2.5 to 4.5 weight percent of a phosphazene flame retardant. The polycarbonate may be a bisphenol A homopolymer comprising a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mole, preferably 17,000 to 25,000 g / mole, as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, and a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mole, preferably 27,000 to 35,000 g / mole, as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard. The polycarbonate-siloxane copolymer may comprise a bisphenol A carbonate repeating unit and a poly(dimethylsiloxane) repeating unit, and may have a siloxane content of 15 to 25 weight percent based on the total weight of the polycarbonate-siloxane copolymer. The triazine-containing UV absorber may include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol. The phosphazene may be hexaphenoxycyclotriphosphazene.

[0070] The polycarbonate composition can exhibit one or more desired properties. For example, it has been found that by combining polycarbonate, preferably bisphenol A polycarbonate homopolymer, polycarbonate-siloxane copolymer, triazine-containing UV absorber, and phosphazene flame retardant, improved color stability, flame performance, and low temperature impact strength can be unexpectedly obtained. Without wishing to be bound by theory, it is believed that the unexpected combination of color stability, flame retardancy, and impact performance is achieved by carefully selecting the triazine-containing UV absorber and phosphazene flame retardant used in the composition.

[0071] The polycarbonate composition can further have good flame retardant properties. In terms of measuring flame retardancy, the UL94 standard uses a grade 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-94V0 grade at a thickness of less than 1.5 millimeters, preferably, a UL-94V0 grade at a thickness of less than or equal to 1.2 millimeters.

[0072] The polycarbonate composition can further have good impact properties, especially notched Izod impact strength. In one aspect, the composition can have a notched Izod impact energy of at least 600 Joules / meter measured at -30°C on a 3.2 mm thick sample according to ASTM D256-10.

[0073] The polycarbonate composition can further have a color shift (ΔE) value less than or equal to 0.75 after exposure to UVA 340 nm at 0.5 W / m for 7 days as measured according to ASTM G154 and a 2.5 mm thick molded sample of the polycarbonate composition.

[0074] In one aspect, the polycarbonate composition can advantageously exhibit the above UL-94 rating, notched impact strength at a temperature of -30°C, and color shift.

[0075] The polycarbonate composition may include 40 to 88.9 weight percent of polycarbonate; 10 to 30 weight percent of a polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer having a siloxane content of 5 to 40 weight percent based on the total weight of the polycarbonate-siloxane copolymer; 0.1 to 5 weight percent of a triazine-containing UV absorber; and 1 to 10 weight percent of a phosphazene flame retardant; wherein the weight percent of each component is based on the total weight of the composition. The polycarbonate may be a bisphenol A homopolymer, preferably comprising a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 40,000 g / mol as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, preferably, the bisphenol A polycarbonate homopolymer may comprise a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mol, preferably 17,000 to 25,000 g / mol as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; or a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mol, preferably 27,000 to 35,000 g / mol as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; or a combination thereof. The polycarbonate-siloxane copolymer may comprise a bisphenol A carbonate repeating unit and a poly(dimethylsiloxane) repeating unit. Based on the total weight of the polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer may have a siloxane content of 10 to 30 weight percent, or 15 to 25 weight percent. The composition may include: less than 5 weight percent or less than 1 weight percent of a polycarbonate-siloxane copolymer, based on the total weight of the polycarbonate siloxane, the polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent; less than 5 weight percent or less than 1 weight percent of a polycarbonate-siloxane copolymer, based on the total weight of the polycarbonate siloxane, the polycarbonate-siloxane copolymer having a siloxane content greater than 30 weight percent; or both. Preferably, the composition may not include: a polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent, based on the total weight of the polycarbonate siloxane; a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 weight percent, based on the total weight of the polycarbonate siloxane; or both. The triazine-containing UV absorber may include a triaryl-1,3,5-triazine UV absorber, such as 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-[(hexyl)oxy]-phenol or 2-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl-5-(octyloxy)phenol. The phosphazene flame retardant may include phenoxyphosphazene, preferably hexaphenoxycyclotriphosphazene. The polycarbonate composition may further include 0.1 to 10 weight percent of an additive composition based on the total weight of the polycarbonate composition.

[0076] Polycarbonate compositions can be prepared by various methods known in the art. For example, powdered polycarbonate homopolymers, polycarbonate-siloxanes, UV absorbers, and phosphazenes and other optional components are first optionally 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 by a hopper. Alternatively, at least one component can be fed directly to the extruder by a side filler at the throat and / or downstream, or by being mixed with the desired polymer into a masterbatch and fed to the extruder and 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. The particles so prepared can be less than a quarter inch long (as required). Such particles can be used for subsequent molding, shaping, or formation.

[0077] Also provided are molded, formed, cast, or molded articles comprising polycarbonate compositions. The polycarbonate compositions can be molded into useful molded 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 devices (such as housings for mobile phones)), electrical connectors, and parts of light fixtures, ornaments, household appliances, roofs, greenhouses, sunrooms, swimming pool fences, electronic equipment packaging and signs, etc. In addition, the polycarbonate compositions can be used in such applications as automotive panels and decorations.Illustrative but non-limiting examples of suitable articles are: exterior and interior parts for aircraft, automobiles, trucks, military vehicles (including automobiles, aircraft and marine vehicles), scooters and motorcycles, including panels, quarter panels (quarter panels, rear wing panels), rocker panels, trim, fenders, doors, deck-lids, trunk lids, lids, hoods, bonnets, roofs, bumpers, instrument panels, grilles, reflector housings, pillar trim, cladding, body side moldings, wheel covers, hubcaps, door handles, spoilers, window frames, headlight bezels, headlights, taillights, taillight housings, taillight bezels, license plate housings, roof racks and dash panels; enclosures, housings, panels, and parts for outdoor vehicles and devices; enclosures for electrical and telecommunications devices; outdoor furniture; aircraft parts; boats and marine equipment, including trim, enclosures, and housings; outboard motor housings; depth sounder housings; personal watercraft; jet skis; pools; spas; hot tubs; steps; step coverings; architectural and construction applications such as glass, roofing, windows, flooring, decorative window furniture or treatments; treated glass covers for pictures, paintings, posters and similar display items; wall panels and doors; countertops; protected graphics; outdoor and indoor signs; enclosures, casings, Panels and parts; computers; desktop computers; portable computers; laptop computers; handheld computer housings; displays; printers; keyboards; fax machines; copiers; telephones; telephone frames; mobile phones; radio transmitters; radio receivers; enclosures, housings, panels, and parts for lawn and garden tractors, mowers, and tools (including lawn and garden tools); window and door trim; sporting equipment and toys; housings, casings, panels, and parts for snowmobiles; recreational vehicle panels and parts; 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 conditioner housings; coverings or seats for public transportation; coverings 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; and similar applications. In one aspect, the article can be used in telecommunication applications, such as for fifth generation (5G) communication articles (e.g., 5G base stations, 5G base station antenna housings, 5G cell tower components, 5G radomes, etc.).

[0078] The present disclosure is further illustrated by the following non-limiting examples.

[0079] Example

[0080] The materials used in the following examples are described in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] The formulations were mixed on a Toshiba TEM-37BS extruder using an L-3-1B internal screw configuration. The raw materials were mixed and fed to the extruder via a throat feeder. Typical extrusion profiles are shown in Table 2.

[0085] Table 2

[0086] Barrel size mm 1500 Screw design / L-3-1B Die mm 4 Zone 1 Temperature ℃ 50 Zone 2 Temperature ℃ 100 Zone 3 Temperature ℃ 265 Zone 4-8 Temperature ℃ 265 Zone 9 Temperature ℃ 265 Zone 10-11 Temperature ℃ 265 Die temperature ℃ 265 Screw speed rpm 400 Throughput kg / h 40 Vacuum 1 MPa -0.08

[0087] The molded parts were injection molded using typical injection molding conditions shown in Table 3.

[0088] Table 3

[0089]

[0090]

[0091] The sample preparation and test methods are described in Table 4.

[0092] Table 4

[0093]

[0094] Examples 1-7

[0095] Table 5 shows the composition and properties of the compositions according to Examples 1 to 7. Comparative examples are indicated with an asterisk.

[0096] Table 5

[0097]

[0098]

[0099]

[0100] The results in Table 5 show that higher loadings of UV absorbers reduce ΔE due to lower yellowing after UVA, UVB or Xenon light aging. However, flame retardancy performance unexpectedly decreases with increasing UV absorbers. It is noted that triazine-based UV absorbers (TZN-1, TZN-2) provide better color retention performance than benzotriazole-based UV absorbers (BZT-1, BZT-2), which is more evident in compositions with high UV absorber loadings. For example, comparing compositions 3* and 6*, the UVA test results after 35 days yielded ΔEs of 13.77 and 8.08, respectively, indicating improved performance using triazine UV agents.

[0101] To obtain the desired combination of flame performance and UV stability, additional formulations were prepared according to Table 6. As shown in Table 6, the compositions according to Examples 8-11 included a phosphazene flame retardant.

[0102] Table 6

[0103]

[0104]

[0105] As shown in Table 6, the presence of PPZ (e.g., 3 to 4 weight percent) provides robust flame performance, achieving a V0 rating at thicknesses of 1.2 and 1.5 mm. It is also noted that the benzotriazole-type UV agent provides reduced low temperature impact performance, while equivalent loading of the triazine-type UV agent provides improved low temperature impact performance.

[0106] The compositions were further evaluated for low temperature impact performance and UV weathering color retention. The results are shown in Table 7.

[0107] Table 7

[0108]

[0109]

[0110] As shown in Table 7, the presence of PPZ provides more robust flame retardant performance compared to KSS as a flame retardant, and in addition, at 340 nm, 0.5 W / m 2 Better color retention was also observed after 21 days of UV-A exposure (without water spray). Higher PPZ loadings (eg, 7% or more) were observed to reduce low temperature impact properties.

[0111] The present invention further encompasses the following aspects.

[0112] Aspect 1: A polycarbonate composition comprising: 40 to 88.9 weight percent of polycarbonate; 10 to 30 weight percent of a polycarbonate-siloxane copolymer, wherein the polycarbonate-siloxane copolymer has a siloxane content of 5 to 40 weight percent based on the total weight of the polycarbonate-siloxane copolymer; 0.1 to 5 weight percent of a triazine-containing UV absorber; and 1 to 10 weight percent of a phosphazene flame retardant; wherein the weight percent of each component is based on the total weight of the composition.

[0113] Aspect 2: The polycarbonate composition according to aspect 1, wherein the polycarbonate is a bisphenol A homopolymer, preferably comprising a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 40,000 g / mole as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard.

[0114] Aspect 3: A polycarbonate composition according to aspect 1 or 2, wherein the polycarbonate comprises: a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mole, preferably 17,000 to 25,000 g / mole, as measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mole, preferably 27,000 to 35,000 g / mole, as measured by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or a combination thereof.

[0115] Aspect 4: The polycarbonate composition according to any one of aspects 1 to 3, wherein the polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units.

[0116] Aspect 5: The polycarbonate composition according to any one of aspects 1 to 4, wherein the polycarbonate-siloxane copolymer has a siloxane content of 10 to 30 weight percent, or 15 to 25 weight percent, based on the total weight of the polycarbonate-siloxane copolymer.

[0117] Aspect 6: A polycarbonate composition according to any one of Aspects 1 to 5, wherein the composition comprises less than 5 weight percent, or less than 1 weight percent, of a polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent based on the total weight of the polycarbonate siloxane; a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 weight percent based on the total weight of the polycarbonate siloxane; or both, preferably, wherein the composition does not comprise: a polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent based on the total weight of the polycarbonate siloxane; a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 weight percent based on the total weight of the polycarbonate siloxane; or both.

[0118] Aspect 7: The polycarbonate composition according to any one of aspects 1 to 6, wherein the triazine-containing UV absorber comprises a triaryl-1,3,5-triazine UV absorber.

[0119] Aspect 8: The polycarbonate composition according to any one of Aspects 1 to 7, wherein the triazine-containing UV absorber comprises 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-[(hexyl)oxy]-phenol or 2-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl-5-(octyloxy)phenol.

[0120] Aspect 9: The polycarbonate composition according to any one of aspects 1 to 8, wherein the phosphazene flame retardant comprises phenoxyphosphazene, preferably hexaphenoxycyclotriphosphazene.

[0121] Aspect 10: The polycarbonate composition according to any one of aspects 1 to 9, 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.

[0122] Aspect 11: A polycarbonate composition according to any one of Aspects 1 to 10, comprising: 65 to 82 weight percent of a polycarbonate; 15 to 25 weight percent of a polycarbonate-siloxane copolymer having a siloxane content of 10 to 30 weight percent, based on the total weight of the polycarbonate-siloxane copolymer; 0.5 to 2 weight percent of a triazine-containing UV absorber; and 2.5 to 4.5 weight percent of a phosphazene flame retardant.

[0123] Aspect 12: The polycarbonate composition according to aspect 11, wherein the polycarbonate is a bisphenol A homopolymer, the bisphenol A homopolymer comprising: a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mole, preferably 17,000 to 25,000 g / mole, as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard; and a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mole, preferably 27,000 to 40,000 g / mole, as measured by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard. 00 to 35,000 g / mol weight average molecular weight linear bisphenol A polycarbonate homopolymer; polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units, and based on the total weight of the polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer has a siloxane content of 15 to 25 weight percent; the triazine-containing UV absorber includes 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol; and the phosphazene is hexaphenoxycyclotriphosphazene.

[0124] Aspect 13: A polycarbonate composition according to any one of Aspects 1 to 12, wherein a molded sample of the composition exhibits: a ΔE less than or equal to 0.75 after exposure to UVA 340nm at 0.5 W / m for 7 days; 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; and a notched Izod impact strength greater than 600 Joules / meter at a temperature of -30°C as determined according to ASTM D256-10.

[0125] Aspect 14: A method of making a polycarbonate composition according to any of aspects 1 to 13, the method comprising melt mixing components of the composition, and optionally, extruding the composition.

[0126] Aspect 15: An article comprising the polycarbonate composition according to any one of aspects 1 to 13.

[0127] Alternatively, the compositions, methods and articles may 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 lack or be essentially free of any material (or species), step, or component that is otherwise not necessary to achieve the function or purpose of the compositions, methods and articles.

[0128] 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" means "and / or". Throughout the specification, mentioning "an aspect" 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 elements described can be combined in any suitable manner in various aspects.

[0129] 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.

[0130] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one 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 an incorporated reference, the term from this application takes precedence over the conflicting term from the incorporated reference.

[0131] 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.

[0132] 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 that only contains carbon and hydrogen. The residue can be aliphatic or aromatic, linear, cyclic, bicyclic, branched, saturated or unsaturated. It can also contain a combination of aliphatic, aromatic, linear, cyclic, bicyclic, branched, saturated and unsaturated hydrocarbon parts. However, when the alkyl residue is described as substituted, it can optionally contain 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 branched or linear, saturated aliphatic alkyl, 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 linear or branched monovalent hydrocarbon radical having at least one carbon-carbon double bond (e.g., vinyl (-HC=CH2)). "Alkoxy" refers to an alkyl radical attached via an oxygen (i.e., alkyl-O-), such as methoxy, ethoxy, and sec-butoxy. "Alkylene" refers to a linear or branched, saturated divalent aliphatic hydrocarbon radical (e.g., methylene (-CH2-) or propylene (-(CH2)3-)). "Cycloalkylene" refers to a divalent cyclic alkylene radical, -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 specific 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 comprising 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 comprising at least one ring member of 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 may be independently C 1-9 Alkoxy, C 1-9 Haloalkoxy, nitro (-NO2), cyano (-CN), C 1-6 Alkylsulfonyl (-S(=O)2-alkyl), C 6-12Arylsulfonyl (-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 A heteroaryl group replaces a hydrogen (provided that the normal valence of the substituted atom is not exceeded). The number of carbon atoms indicated in a group does not include any substituents. For example, -CH2CH2CN is a C2 alkyl group substituted with a nitrile.

[0133] 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: 40 to 88.9 weight percent polycarbonate; 10 to 30 weight percent of a polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer having a siloxane content of 5 to 40 weight percent based on the total weight of the polycarbonate-siloxane copolymer; 0.1 to 5 weight percent of a triazine-containing UV absorber; and 1 to 10 weight percent of a phosphazene flame retardant; in, The weight percentage of each component is based on the total weight of the composition.

2. The polycarbonate composition according to claim 1, wherein The polycarbonate is a bisphenol A homopolymer, preferably comprising a linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 40,000 g / mole as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard.

3. The polycarbonate composition according to claim 1 or 2, wherein The polycarbonate comprises: Linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mole, preferably 17,000 to 25,000 g / mole, as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or Linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mole, preferably 27,000 to 35,000 g / mole, as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; or A combination of them.

4. The polycarbonate composition according to any one of claims 1 to 3, wherein The polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units.

5. The polycarbonate composition according to any one of claims 1 to 4, wherein The polycarbonate-siloxane copolymer has a siloxane content of 10 to 30 weight percent, or 15 to 25 weight percent, based on the total weight of the polycarbonate-siloxane copolymer.

6. The polycarbonate composition according to any one of claims 1 to 5, wherein The composition comprises less than 5 weight percent, or less than 1 weight percent, of a polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent based on the total weight of the polycarbonate siloxane; a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 weight percent based on the total weight of the polycarbonate siloxane; or both, Preferably, the composition does not include a polycarbonate-siloxane copolymer having a siloxane content of less than 10 weight percent based on the total weight of the polycarbonate siloxane; a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 weight percent based on the total weight of the polycarbonate siloxane; or both.

7. The polycarbonate composition according to any one of claims 1 to 6, wherein The triazine-containing UV absorber comprises a triaryl-1,3,5-triazine UV absorber.

8. The polycarbonate composition according to any one of claims 1 to 7, wherein The triazine-containing UV absorber includes 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol or 2-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl-5-(octyloxy)phenol.

9. The polycarbonate composition according to any one of claims 1 to 8, wherein The phosphazene flame retardant includes phenoxyphosphazene, preferably hexaphenoxycyclotriphosphazene.

10. The polycarbonate composition according to any one of claims 1 to 9, 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.

11. The polycarbonate composition according to any one of claims 1 to 10, comprising: 65 to 82 weight percent polycarbonate; 15 to 25 weight percent of a polycarbonate-siloxane copolymer, the polycarbonate-siloxane copolymer having a siloxane content of 10 to 30 weight percent based on the total weight of the polycarbonate-siloxane copolymer; 0.5 to 2 weight percent of a triazine-containing UV absorber; and 2.5 to 4.5 weight percent of phosphazene flame retardant.

12. The polycarbonate composition according to claim 11, wherein The polycarbonate is a bisphenol A homopolymer, comprising: A linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 15,000 to 25,000 g / mole, preferably 17,000 to 25,000 g / mole, as determined by gel permeation chromatography relative to a linear bisphenol A polycarbonate standard, and Linear bisphenol A polycarbonate homopolymer having a weight average molecular weight of 26,000 to 40,000 g / mole, preferably 27,000 to 35,000 g / mole, as determined by gel permeation chromatography relative to linear bisphenol A polycarbonate standards; The polycarbonate-siloxane copolymer comprises bisphenol A carbonate repeating units and poly(dimethylsiloxane) repeating units and has a siloxane content of 15 to 25 weight percent based on the total weight of the polycarbonate-siloxane copolymer; The triazine-containing UV absorber comprises 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol; and The phosphazene is hexaphenoxycyclotriphosphazene.

13. The polycarbonate composition according to any one of claims 1 to 12, wherein Molded samples of the compositions exhibited: A ΔE of less than or equal to 0.75 after exposure to UVA 340nm at 0.5W / m for 7 days; 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; and Notched Izod impact strength greater than 600 Joules / meter at a temperature of -30°C as measured in accordance with ASTM D256-10.

14. A method of making the polycarbonate composition of any one of claims 1 to 13, 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, optionally wherein, The article is a shaped article, a formed article, a cast article, or a molded article, preferably wherein: The article is a housing for an electronic device, an electrical connector, a lighting component, an automobile component, an aircraft component, or a 5G communication system component.

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