Flame-retardant polymer composition

Abstract

The present invention (A) 2.0 to 15.0 weight% of an ethylene copolymer comprising a unit selected from the group consisting of methyl acrylate, methyl methacrylate, or a mixture thereof; (B) 0 to 4.0 weight% of polypropylene and / or polyethylene containing units derived from maleic anhydride; (C) 0.1 to 3.0 wt% of silicone fluid and / or silicone gum; (D) Magnesium hydroxide 40.0~55.0 wt%; (E) Copolymer of ethylene and alpha-olefin comonomer units having 4 to 10 carbon atoms (having a density of 860 to 910 kg / m³ as determined according to ISO 1183) 2.0 to 15.0 wt%; (F) Copolymer of ethylene and alpha-olefin comonomer units having 4 to 10 carbon atoms (having a density of 920 to 960 kg / m³ determined according to ISO 1183 and a melt flow rate MFR 50.05 to 2.50 g / 10 min determined according to ISO 1133 at a temperature of 190°C and a load of 5.0 kg) 18.0 to 35.0 wt%; and (G) Carbon Black 0~8.0 wt% (Here, all weight percentages are based on the total weight of the flame-retardant polymer composition.) A flame-retardant polymer composition comprising, an article such as a wire or cable comprising said flame-retardant polymer composition; and This relates to the use of the flame-retardant polymer composition for the production of articles such as wires or cables.

Description

Technology Field

[0001] The present invention relates to a flame-retardant polymer composition and an article, in particular to the use of said flame-retardant polymer composition for the manufacture of a wire or cable, such as a jacket layer comprising said flame-retardant polymer composition. Background Technology

[0002] Flame-retardant compounds generally face challenges due to limitations in mechanical properties, such as tensile strength and tear strength, or in flame retardancy (FR) properties. There is increasing demand for flame-retardant products that can satisfy both mechanical and FR requirements. An example of a product in high demand is listed in IEC 60840:2020 "Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) - Test methods and requirements" (Um = maximum allowable voltage). The standard imposes higher mechanical requirements compared to a low-voltage jacket layer, which has a tensile strength of 12.5 MPa and an elongation at break of 300% before and after thermal aging at 110°C for 10 days. Currently, commercial FR products often struggle due to inferior tensile properties and / or limited flame retardancy. Another problem observed with flame-retardant materials is the cracking of the cable sheathing on cable reels during installation, use, or even during a fire. The cracking characteristics of the material can be understood by measuring the tear strength at various temperatures.

[0003] WO 2021 / 111006 A1 discloses a flame-retardant polymer composition having excellent flame retardancy and acceptable mechanical properties for low-voltage cable applications, but not sufficient for the higher mechanical requirements described above as described in IEC 60840:2020.

[0004] Therefore, there is a need in the industry for a flame-retardant polymer composition that exhibits flame retardancy and improved mechanical properties, sufficient in tensile strength, elongation at break, and tear strength, for example, to meet the requirements for cable jackets for medium and high voltage cables described in IEC 60840:2020.

[0005] Summary of the Invention

[0006] The present invention relates to a flame-retardant polymer composition comprising the following.

[0007] (A) 2.0 to 15.0 weight% of an ethylene copolymer comprising a unit selected from the group consisting of methyl acrylate, methyl methacrylate, or a mixture thereof;

[0008] (B) 0 to 4.0 weight% of polypropylene and / or polyethylene containing units derived from maleic anhydride;

[0009] (C) 0.1 to 3.0 wt% of silicone fluid and / or silicone gum;

[0010] (D) Magnesium hydroxide 40.0~55.0 wt%;

[0011] (E) Copolymer of ethylene and alpha-olefin comonomer units having 4 to 10 carbon atoms (density determined according to ISO 1183 860–910 kg / m³ 3 (having) 2.0~15.0 wt%;

[0012] (F) Copolymer of ethylene and alpha-olefin comonomer units having 4 to 10 carbon atoms (density 920–960 kg / m³ determined according to ISO 1183) 3 and 18.0~35.0 wt% having a melt flow rate MFR 50.05~2.50 g / 10 min determined according to ISO 1133 at a temperature of 190℃ and a load of 5.0 kg; and

[0013] (G) Carbon black 0~8.0 wt%.

[0014] (Here, all weight percentages are based on the total weight of the flame-retardant polymer composition.)

[0015] In addition, the present invention relates to an article comprising a flame-retardant polymer composition described above or below.

[0016] In addition, the present invention relates to the use of the flame-retardant polymer composition described above or below for the manufacture of articles.

[0017] definition

[0018] In the spirit of the present invention, polyethylene is a polymer having ethylene monomer units in the molar majority (i.e., at least 50 mol%).

[0019] A copolymer of ethylene is a polymer having a molar majority of ethylene monomer units and at least one unit of another chemical moiety (e.g., selected from alpha-olefins, methyl acrylates, methyl methacrylates, maleic anhydride). Units of the other chemical moiety may be introduced into the polymer by copolymerization (i.e., comonomer units) or by grafting onto the polymer backbone as known in the art.

[0020] In the spirit of the present invention, polypropylene is a polymer having propylene monomer units in the molar majority (i.e., at least 50 mol%).

[0021] A propylene copolymer is a polymer having a molar majority of propylene monomer units and at least one unit of another chemical moiety (e.g., selected from maleic anhydride). The unit of the other chemical moiety may be introduced into the polymer by copolymerization (i.e., comonomer units) or by grafting onto the polymer backbone as is known in the art.

[0022] Throughout this application, the particle sizes of some particulate materials are described by particle size distributions. The d value represents the diameter for x weight percent of particles having a diameter smaller than dx. Thus, d 50The value is the "median particle size" where 50% by weight of all particles is smaller than the indicated particle size.

[0023] According to the present invention, the magnesium hydroxide material used as component (D) may contain impurities such as calcium oxide, silicon oxide, and iron oxide. It is preferable that component D) contain 80 to 98 weight% magnesium hydroxide, preferably more than 85 weight%, more preferably more than 90 weight%, and even more preferably more than 92.5 weight% magnesium hydroxide. The amount and nature of the impurities may vary depending on the source of the starting mineral.

[0024] Where the term “comprising” is used in this specification and claims, it does not exclude other unspecified elements of functionally important or minor functional importance. For the purposes of the invention, the term “comprising” is considered to be a preferred embodiment of the term “comprising” including. Where a group is defined below as comprising at least a specific number of embodiments, it should also be understood to disclose a group preferably composed only of these embodiments. Specific details for implementing the invention

[0025] Ingredient (A)

[0026] The flame-retardant polymer composition comprises, as component (A), an ethylene copolymer containing a unit selected from the group consisting of methyl acrylate, methyl methacrylate, or a mixture thereof, in an amount of 2.0 to 15.0 weight%, preferably 3.0 to 14.0 weight%, more preferably 4.0 to 13.0 weight%, and even more preferably 5.5 to 12.5 weight%, based on the total weight of the flame-retardant polymer composition.

[0027] Component (A) is preferably a copolymer comprising ethylene units and methyl acrylate units and preferably composed thereof.

[0028] The content of a unit selected from the group consisting of methyl acrylate, methyl methacrylate, or a mixture thereof, preferably the content of a methyl acrylate unit, is preferably in the range of 10 to 35 weight%, preferably in the range of 20 to 30 weight%, based on the total weight of component (A).

[0029] Preferably, component (A) is 920 to 960 kg / m³ determined according to ISO 1183. 3 Range, preferably 935 to 950 kg / m² 3 It has a density of the range.

[0030] Component (A) has an MFR2 in the range of 0.1 to 10 g / 10 min, preferably in the range of 0.1 to 5.0 g / 10 min, measured according to ISO 1133 (2.16 kg, 190°C), and more preferably in the range of 0.2 to 0.7 g / 10 min.

[0031] In one preferred embodiment, component (A) comprises a unit having a hydrolyzable silane group, wherein the unit having a hydrolyzable silane group is preferably represented by the chemical formula (I):

[0032] R 1 SiR 2 q Y 3-q (I)

[0033] Here

[0034] R 1 is an ethylene-based unsaturated hydrocarbyl, hydrocarbyloxy, or (meth)acryloxyhydrocarbyl group, and

[0035] Each R 2 is independently an aliphatic saturated hydrocarbyl group, and

[0036] Y, which may be the same or different, is a hydrolyzable organic group, and

[0037] q is 0, 1, or 2.

[0038] The content of the comonomer unit containing a crosslinkable silane group is preferably in the range of 0.2 to 4.0 weight%, more preferably 0.4 to 2.0 weight%, based on the total weight of component (A).

[0039] A suitable ingredient that can be used as ingredient (A) according to the present invention is marketed, for example, by DuPont (USA) under the name Elvaloy® AC 1125.

[0040] Ingredient (B)

[0041] The flame-retardant polymer composition comprises, as component (B), polyethylene and / or polypropylene containing units derived from maleic anhydride in an amount of 0 to 4.0 weight%, preferably 0.5 to 3.5 weight%, more preferably 1.0 to 3.0 weight%, and even more preferably 1.5 to 2.5 weight%, based on the total weight of the flame-retardant polymer composition.

[0042] Component (B) is preferably obtained by copolymerizing and / or grafting polyethylene with maleic anhydride, and thus grafted linear low-density polyethylene is preferred, and more preferably the content of maleic anhydride is in the range of 0.3 to 2.0 weight%.

[0043] Preferably, component (B) has a density of 910 to 950 kg / m³ determined according to ISO 1183. 3 Range, preferably 920 to 940 kg / m² 3 It is a range.

[0044] It is preferable that component (B) be in the range of 0.5 to 5.0 g / 10 min, preferably 1.5 to 2.5 g / 10 min, of MFR2 (2.16 kg for polyethylene, 190°C, and 2.16 kg for polypropylene, 230°C) determined according to ISO 1133.

[0045] Suitable polyethylene and / or polypropylene-containing units derived from maleic anhydride that can be used as component (B) according to the present invention are marketed, for example, by HDC Hyundai EP Co., Ltd. under the trade name Polyglue® GE300C.

[0046] Component (C)

[0047] The flame-retardant polymer composition comprises, as component (C), silicone fluid and / or silicone gum in an amount of 0.1 to 3.0 weight%, preferably 0.3 to 2.8 weight%, more preferably 0.5 to 2.5 weight%, and even more preferably 0.7 to 2.3 weight% based on the total weight of the flame-retardant polymer composition.

[0048] Component (C) is preferably a silicone fluid or silicone rubber selected from the group consisting of polysiloxane, preferably polydimethylsiloxane, and siloxanes containing alkoxy or alkyl functional groups and mixtures thereof, and more preferably, component (C) is an organically modified siloxane.

[0049] It is particularly preferable that component (C) is an organopolysiloxane polymer comprising chemically bonded siloxy units. Preferably, the siloxy units are R3SiO 0.5 , R2SiO, R 1 SiO 1.5 , R 1 R2SiO 0.5 , RR 1 SiO, R 1 2SiO, RSiO 1.5 and selected from the group consisting of SiO2 units and mixtures thereof, wherein each R independently represents a saturated or unsaturated monovalent hydrocarbon substituent, and each R 1 represents a substituent selected from a group consisting of a hydrogen atom, a hydroxyl, alkoxy, aryl, vinyl, or allyl group, or a substituent such as R.

[0050] The component (C) is approximately 600 to 300 x 10⁻⁶ at 25°C. 6 It is preferable that it be an organopolysiloxane polymer having centipoise viscosity.

[0051] Examples of organopolysiloxanes found to be suitable are approximately 20 x 10 at 25°C. 6 It is a polydimethylsiloxane polymer having centipoise viscosity.

[0052] Preferably, component (C) contains up to 50 weight percent of fumed silica filler of the type commonly used to cure silicone rubber.

[0053] Suitable silicone fluids and / or silicone gums that can be used as ingredient (C) are commercially available, for example, as Tegomer® 6264 from Evonik Nutrition & Care GmbH (Germany), as DOW CORNING™ AMB-12235 MASTERBATCH from DuPont, or as FR4897 from Borealis AG (Austria).

[0054] Ingredient (D)

[0055] The flame-retardant polymer composition contains magnesium hydroxide as component (D) in an amount of 40.0 to 55.0 weight%, preferably 42.5 to 53.5 weight%, more preferably 45.0 to 52.5 weight%, and even more preferably 47.5 to 51.0 weight% based on the total weight of the flame-retardant polymer composition.

[0056] Component (D) is preferably ground or precipitated magnesium hydroxide, and more preferably ground magnesium hydroxide.

[0057] Although precipitated magnesium hydroxide is generally more expensive than ground magnesium hydroxide, the precipitated type of magnesium hydroxide remains dominant because it has a smaller particle size and a more homogeneous particle size distribution, which does not significantly degrade the mechanical properties of the polymer matrix. A specific combination of components in the flame-retardant polymer composition of the present invention also allows the use of the ground magnesium type to obtain excellent mechanical properties.

[0058] According to the present invention, "crushed magnesium hydroxide" is a magnesium hydroxide obtained by crushing a magnesium hydroxide-based mineral such as brucite. Brewcite is found in pure form, or more often, in combination with other minerals such as calcite, aragonite, talc, or magnesite, and exists in a layered form (e.g., as serpentine asbestos, chlorite, or schist) among silicate deposits.

[0059] Minerals containing magnesium hydroxide can be ground according to the following technique: advantageously, the mineral obtained from the mine is first crushed, and then, preferably, ground repeatedly, followed by a sieving step after each crushing / grinding step. Grinding can be carried out under wet or dry conditions, for example by ball milling, optionally in the presence of a grinding aid, for example, polyglycol.

[0060] Suitable ground magnesium hydroxide that can be used as ingredient (D) is commercially available, for example, from Europiren BV (Netherlands) under the brand name Ecopiren® 3.5C.

[0061] In a preferred embodiment, component (D) is preferably used in the form of particles treated with at least one saturated or unsaturated fatty acid or its metal salt having a surface containing 8 to 24 carbon atoms: e.g., oleic acid, palmitic acid, stearic acid, isostearic acid, lauric acid; magnesium or zinc stearate or oleate; etc.

[0062] Component (D) may also be used without surface treatment.

[0063] Preferably, component (D) has an intermediate particle size d in the range of 1.0 to 10.0 μm, preferably in the range of 2.0 to 5.0 μm, and more preferably in the range of 3.0 to 4.0 μm. 50 It is a crushed magnesium hydroxide having

[0064] Component (D) is preferably ground magnesium hydroxide surface-treated with stearic acid.

[0065] Accordingly, the stearic acid content is preferably 1.0 to 3.0 weight% based on the weight of the ground magnesium hydroxide, and more preferably 1.5 to 2.5 weight%.

[0066] It is more preferable that component (D) be a ground or precipitated magnesium hydroxide having a BET surface area in the range of 1 to 20 m² / g, preferably in the range of 5 to 12 m² / g.

[0067] Ingredient (E)

[0068] The flame-retardant polymer composition comprises a copolymer of ethylene and an alpha-olefin comonomer unit having 4 to 10 carbon atoms, having a density of 860 to 910 kg / m³ as determined according to ISO 1183. 3And, as (component (E)), based on the total weight of the flame-retardant polymer composition, it is included in an amount of 2.0 to 15.0 weight%, preferably 3.0 to 14.0 weight%, more preferably 4.0 to 13.0 weight%, and even more preferably 5.0 to 12.5 weight%.

[0069] The component (E) is preferably a copolymer of ethylene and one or more alpha-olefin comonomer units selected from 1-butene, 1-hexene and / or 1-octene.

[0070] Preferably, component (E) is selected from a copolymer of ethylene and 1-butene, a copolymer of ethylene and 1-hexene, a copolymer of ethylene and 1-octene, more preferably a copolymer of ethylene and 1-butene and a copolymer of ethylene and 1-octene.

[0071] It is particularly desirable that component (E) is a copolymer of ethylene and 1-octene.

[0072] The component (E) has a density of 860–910 kg / m³ as determined according to ISO 1183. 3 , preferably 870~905 kg / m² 3 , more preferably 880~903 kg / m² 3 am.

[0073] Preferably, the component (E) has a melt flow rate MFR2 in the range of 0.1 to 10.0 g / 10 min when measured according to ISO 1133 (2.16 kg, 190°C), more preferably in the range of 0.5 to 5.0 g / 10 min, and even more preferably in the range of 1.0 to 3.5 g / 10 min.

[0074] Preferably, component (E) is polymerized in the presence of a single-site catalyst. Suitably, component (E) is polymerized by a solution polymerization process known in the art.

[0075] 860 to 910 kg / m³ that can be used as component (E) 3Copolymers of alpha-olefin comonomer units having 4 to 10 carbon atoms and ethylene having a density are commercially available, for example, from Borealis AG (Austria) under the trade names Queo 8201 or Queo 8203.

[0076] Ingredient (F)

[0077] The flame-retardant polymer composition comprises a copolymer of ethylene and an alpha-olefin comonomer unit having 4 to 10 carbon atoms, having a density of 920 to 965 kg / m³ as determined according to ISO 1183. 3 And, the melt flow rate MFR5 measured according to ISO 1133 (5.0 kg, 190°C) is 0.05 to 2.50 g / 10 min, and as component (F), based on the total weight of the flame-retardant polymer composition, it is included in an amount of 18.0 to 35.0 wt%, preferably 20.0 to 32.5 wt%, more preferably 22.0 to 30.0 wt%, and even more preferably 24.0 to 28.0 wt%.

[0078] The component (F) is preferably a copolymer of ethylene and one or more alpha-olefin comonomer units selected from 1-butene, 1-hexene and / or 1-octene.

[0079] Preferably, component (F) is selected from a copolymer of ethylene and 1-butene, a copolymer of ethylene and 1-hexene, a copolymer of ethylene and 1-octene, and more preferably a copolymer of ethylene and 1-butene and a copolymer of ethylene and 1-hexene.

[0080] It is particularly preferable that component (F) is a copolymer of ethylene and 1-hexene.

[0081] The component (F) has a density of 920–965 kg / m³ determined according to ISO 1183. 3 , preferably 930~963 kg / m² 3 , more preferably 940~960 kg / m² 3 am.

[0082] In one embodiment, component (F) is a natural resin copolymer of an alpha-olefin comonomer unit having 4 to 10 carbon atoms and ethylene, i.e., a natural resin without carbon black.

[0083] In the above embodiment, the component (F) preferably has a density determined according to ISO 1183 of 920 to 955 kg / m³ 3 , preferably 930 to 953 kg / m² 3 , more preferably 940 to 950 kg / m² 3 am.

[0084] In another embodiment, component (F) is a black resin of a copolymer of ethylene and an alpha-olefin comonomer unit having 4 to 10 carbon atoms, i.e., a black resin containing carbon black in an amount of up to 5.0 weight%, preferably up to 3.5 weight%.

[0085] In the above embodiment, the component (F) preferably has a density determined according to ISO 1183 of 930 to 965 kg / m³ 3 , preferably 940 to 963 kg / m² 3 , more preferably 950 to 960 kg / m² 3 am.

[0086] Additionally, the component (F) has a melt flow rate MFR5 determined according to ISO 1133 (5.0 kg, 190°C) of 0.05 to 2.50 g / 10 min, preferably 0.10 to 1.50 g / 10 min, more preferably 0.15 to 1.00 g / 10 min, and even more preferably 0.20 to 0.50 g / 10 min.

[0087] Additionally, component (F) is preferably at a melt flow rate MFR determined according to ISO 1133 (5.0 kg, 190°C). 21 The amount is 2.0 to 40.0 g / 10 min, preferably 3.0 to 30.0 g / 10 min, more preferably 4.0 to 20.0 g / 10 min, and even more preferably 5.0 to 5.0 g / 10 min.

[0088] The component (F) is preferably a dimode copolymer of ethylene and an alpha-olefin comonomer unit having 4 to 10 carbon atoms, more preferably a multimode copolymer.

[0089] In this specification, the term “multimode” refers to a multimode in relation to molecular weight distribution, and thus includes bimode polymers. Generally, a polyethylene composition comprising at least two polyethylene fractions produced under different polymerization conditions, resulting in different (weight-average) molecular weights and molecular weight distributions for the fractions, is referred to as “multimode.” The prefix “multimode” relates to the number of different polymer fractions present in the polymer. Thus, for example, a multimode polymer includes a so-called “bimode” polymer composed of two fractions. The shape of the molecular weight distribution curve—that is, the shape of the graph of the polymer weight fractions according to the molecular weight of the multimode polymer—shows two or more maximum values ​​or is generally distinctly wider compared to the curve for the individual fractions. For example, if the polymer is produced in a sequential multi-stage process utilizing reactors connected in series and using different conditions in each reactor, the polymer fractions produced in the different reactors each have a unique molecular weight distribution and weight-average molecular weight. When the molecular weight distribution curves of such polymers are recorded, the individual curves from these fractions typically combine to form an extended molecular weight distribution curve for the entire polymer product.

[0090] Polymerization methods well known to those skilled in the art may be used to prepare component (F). At least a dimode polymer produced by multimode (e.g., mixing each component in-situ during the polymerization process (so-called in-situ process) or, alternatively, mechanically mixing two or more components produced separately in a manner known in the art) is within the scope of the present invention.

[0091] The ethylene copolymer useful in the present invention as component (F) is preferably obtained by in-situ mixing in a multi-stage polymerization process. Accordingly, the polymer is obtained by in-situ mixing of a multi-stage, i.e., two or more stages of polymerization processes, including solution, slurry, and gas phase processes, in any order. Although it is possible to use different polymerization catalysts in each stage of the process, it is preferable that the catalyst used in both stages be the same.

[0092] Therefore, ideally, the polyethylene polymer used in the blend of the present invention is produced by at least two-step polymerization using a single-site catalyst or a Ziegler-Natta catalyst. Thus, for example, two slurry reactors or two gas-phase reactors, or any combination thereof, may be used in any order. However, preferably, the ethylene copolymer is produced using slurry polymerization in a loop reactor followed by gas-phase polymerization in a gas-phase reactor.

[0093] Loop reactor-gas reactor systems are well known as Borealis technology, namely the BORSTAR™ reactor system. Such multi-stage processes are disclosed, for example, in EP517868. The conditions used in such processes are well known. In the case of a slurry reactor, the reaction temperature will generally be in the range of 60 to 110°C, e.g., 85 to 110°C, the reactor pressure will generally be in the range of 5 to 80 bar, e.g., 50 to 65 bar, and the residence time will generally be in the range of 0.3 to 5 hours, e.g., 0.5 to 2 hours. The diluent used is generally an aliphatic hydrocarbon with a boiling point in the range of -70 to +100°C, e.g., propane. In such a reactor, polymerization can be carried out under supercritical conditions if desired. Slurry polymerization may also be carried out in bulk, where the reaction medium is formed from the monomer being polymerized.

[0094] In the case of a gas-phase reactor, the reaction temperature used will generally be in the range of 60 to 115°C, e.g., 70 to 110°C, the reactor pressure will generally be in the range of 10 to 25 bar, and the residence time will generally be 1 to 8 hours. The gas used will generally be a non-reactive gas such as nitrogen or a low-boiling point hydrocarbon such as propane with monomer ethylene. Preferably, the first polymer fraction is produced in a continuous-operation loop reactor in which ethylene is polymerized in the presence of the aforementioned polymerization catalyst and a chain transfer agent such as hydrogen. The diluent is generally an inert aliphatic hydrocarbon, preferably isobutane or propane. The reaction product is then preferably transferred to a continuously operating gas-phase reactor. Subsequently, the second component can be formed in the gas-phase reactor using preferably the same catalyst.

[0095] A copolymer of ethylene and alpha-olefin comonomer units having 4 to 10 carbon atoms, with a density of 920–965 kg / m³ 3 A component (F) with a melt flow rate MFR5 of 0.05 to 2.50 g / 10 min can be used, and this is marketed, for example, by Borealis AG (Austria) under the trade names Borsafe HE3490-LS-H or Borsafe HE3493-LS-H.

[0096] Ingredients (G)

[0097] The flame-retardant polymer composition optionally contains carbon black as a component (G) in an amount of 0 to 8.0 weight%, preferably 0 to 7.5 weight%, more preferably 0 to 6.5 weight%, and even more preferably 0 to 6.0 weight%, based on the total weight of the flame-retardant polymer composition.

[0098] Carbon black is preferably added to the flame-retardant polymer composition as a carbon black masterbatch comprising 30 to 50 weight percent of carbon black in a polyethylene matrix based on the total weight of the carbon black masterbatch. When using a carbon black masterbatch, the amount of carbon black in the flame-retardant polymer composition includes the amount of the polyethylene matrix.

[0099] The carbon black masterbatch preferably has a density determined according to ISO 1183 of 1,100 to 1,200 kg / m³ 3 , preferably 1115 to 1150 kg / m² 3 am.

[0100] In one embodiment, the flame-retardant polymer composition does not contain carbon black. In the above embodiment, the amount of component (G) in the flame-retardant polymer composition is 0 weight%, and component (F) is 920 to 955 kg / m³ determined according to ISO 1183. 3 , preferably 930 ~ 953 kg / m² 3 , more preferably 940 ~ 950 kg / m² 3 It is a natural resin of a copolymer of ethylene and an alpha-olefin comonomer unit having 4-10 carbon atoms with a density.

[0101] In the second embodiment, the flame-retardant polymer composition comprises carbon black in the form of component (G). In the above embodiment, the amount of component (G) in the flame-retardant polymer composition is 0.5 to 8.0 wt%, 1.0 to 7.5 wt%, preferably 1.5 to 6.5 wt%, more preferably 2.0 to 6.0 wt% based on the total weight of the flame-retardant polymer composition, and component (F) is 920 to 955 kg / m² determined according to ISO 1183. 3 , preferably 930 ~ 953 kg / m² 3 , more preferably 940 ~ 950 kg / m² 3It is a natural resin of a copolymer of ethylene and an alpha-olefin comonomer unit having 4-10 carbon atoms with a density.

[0102] In the third embodiment, the flame-retardant polymer composition comprises carbon black in the form of a black resin of an ethylene copolymer as component (F). In the above embodiment, the amount of component (G) in the flame-retardant polymer composition is 0 weight%, and component (F) is 930 to 965 kg / m² determined according to ISO 1183. 3 , preferably 940 ~ 963 kg / m² 3 , more preferably 950 ~ 960 kg / m² 3 It is a natural resin of a copolymer of ethylene and an alpha-olefin comonomer unit having 4-10 carbon atoms with a density.

[0103] A carbon black masterbatch suitable as component (G) in the present invention, which can be used as component (F), is marketed, for example, by Borealis AG (Austria) under the trade name Borlink LE7710.

[0104] additives

[0105] The flame-retardant polymer composition according to the present invention may also include additives.

[0106] According to a preferred embodiment of the present invention, the polymer composition preferably comprises one or more additives selected from the group consisting of slip agents, UV stabilizers, antioxidants, additive carriers, nucleating agents, mica, scorch retardants, and mixtures thereof.

[0107] The additive is present in an amount of, based on the total weight of the flame retardant polymer composition, preferably 0 to 5.0 weight%, preferably 0.05 to 2.5 weight%, more preferably 0.10 to 1.5 weight%, and even more preferably 0.15 to 1.0 weight%.

[0108] The flame-retardant polymer composition preferably comprises an antioxidant comprising a sterically hindered phenol group or an aliphatic sulfur group. Such compounds are disclosed in EP 1 254 923 A1 as antioxidants particularly suitable for stabilizing polyolefins containing hydrolyzable silane groups.

[0109] Other preferred antioxidants are disclosed in WO 2005 / 003199 A1. Preferably, the antioxidant is present in the composition in an amount of 0.01 to 3 weight%, more preferably 0.05 to 2 weight%, and most preferably 0.08 to 1.5 weight% based on the total weight of the flame-retardant polymer composition.

[0110] When the flame-retardant polymer composition of the present invention is cross-linked, it may include a scorch retardant. The scorch retardant may be a silane-containing scorch retardant as described in EP 0 449 939 A1. Where applicable, the scorch retardant may be present in the flame-retardant polymer composition in an amount of 0.3% to 5.0% by weight based on the total weight of the flame-retardant polymer composition.

[0111] Flame-retardant polymer composition

[0112] The flame-retardant polymer composition comprises components (A) to (F), optionally component (G) and additives in the amounts described above.

[0113] Preferably, the flame-retardant polymer composition comprises the following, and more preferably consists of the following:

[0114] Component (A) 3.0 to 14.0 weight%, preferably 4.0 to 13.0 weight%, more preferably 5.5 to 12.5 weight%;

[0115] Component (B) 0.5 to 3.5 weight%, preferably 1.0 to 3.0 weight%, more preferably 1.5 to 2.5 weight%;

[0116] Component (C) 0.3 to 2.8 weight%, preferably 0.5 to 2.5 weight%, more preferably 0.7 to 2.3 weight%;

[0117] Component (D) 42.5 to 53.5 weight%, preferably 45.0 to 52.5 weight%, more preferably 47.5 to 51.0 weight%;

[0118] Component (E) 3.0 to 14.0 weight%, preferably 4.0 to 13.0 weight%, more preferably 5.0 to 12.5 weight%;

[0119] Component (F) 20.0 to 32.5 weight%, preferably 22.0 to 30.0 weight%, more preferably 24.0 to 28.0 weight%;

[0120] Based on the total weight of the carbon black masterbatch, 0 to 7.5 weight%, preferably 0 to 6.5 weight%, more preferably 0 to 6.0 weight% of a carbon black masterbatch comprising 30 to 50 weight% of carbon black in a polyethylene matrix; and

[0121] 0.05 to 2.5 weight% of an additive selected from the group consisting of slip agents, UV stabilizers, antioxidants, additive carriers, nucleating agents, mica, and mixtures thereof, preferably 0.10 to 1.5 weight%, more preferably 0.15 to 1.0 weight%

[0122] (All weight percentages herein are based on the total weight of the flame-retardant polymer composition.)

[0123] According to a preferred embodiment of the present invention, the flame-retardant polymer composition does not contain calcium borate and zinc borate, and it is even more preferable that the flame-retardant polymer composition does not contain any metal borate.

[0124] Another preferred embodiment of the present invention is defined as a flame-retardant polymer composition that is free of inorganic hypophosphite.

[0125] It is preferable that the flame-retardant polymer composition has a tensile strength determined according to ISO 527-1 and ISO 527-2 that is preferably 12.5 MPa to 25.0 MPa, preferably 13.0 to 22.5 MPa, more preferably 13.5 to 21.0 MPa, and even more preferably 14.0 to 20.0 MPa.

[0126] After conditioning the test specimen at 110℃ for 240 hours, the flame-retardant polymer composition preferably has a tensile strength determined according to ISO 527-1 and ISO 527-2 of 12.5 MPa to 25.0 MPa, preferably 3.0 to 22.5 MPa, more preferably 13.5 to 21.0 MPa, and even more preferably 14.0 to 20.0 MPa.

[0127] It is desirable that the flame-retardant polymer composition exhibits a change in tensile strength of -5.0% to +5.0%, preferably -3.5% to +3.5%, as a ratio of tensile strength before conditioning to tensile strength after conditioning.

[0128] It is preferable that the flame-retardant polymer composition has a breaking elongation determined according to ISO 527-1 and ISO 527-2 that is preferably 350% to 550%, preferably 370% to 525%, more preferably 390% to 500%, and even more preferably 400% to 480%.

[0129] After conditioning the test specimen at 110°C for 240 hours, the flame-retardant polymer composition preferably has a breaking elongation determined according to ISO 527-1 and ISO 527-2 of 300% to 500%, preferably 310% to 475%, more preferably 315% to 450%, and even more preferably 320% to 430%.

[0130] It is preferable that the flame-retardant polymer composition exhibits a change in elongation at break such that the ratio of elongation at break before conditioning to elongation at break after conditioning is 0% to 20.0%, preferably 5.0% to 15.0%.

[0131] In addition, the flame-retardant polymer composition preferably has a tear strength determined at a temperature of 23°C according to BS 6469 Section 99.1:1992, HD 605 S2:2008 Section 2.2.2.2 Method 2, which is preferably 8.5 to 25.0 N / mm, more preferably 10.0 to 22.5 N / mm, and even more preferably 11.0 to 20.0 N / mm at 23°C.

[0132] In addition, the flame-retardant polymer composition preferably has a tear strength determined at a temperature of 50°C according to BS 6469 Section 99.1:1992, HD 605 S2:2008 Section 2.2.2.2 Method 2, which is preferably 8.5 to 20.0 N / mm, more preferably 9.0 to 17.5 N / mm, and even more preferably 10.0 to 15.0 N / mm at 50°C.

[0133] The flame-retardant polymer composition preferably has a peak heat release rate (pHRR) determined by a cone calorimeter test according to ISO 5660-1 of 75 to 250 kW / m² 2 , more preferably 75 to 230 kW / m 2 , more preferably 75 to 210 kW / m 2 It is desirable that it is.

[0134] In addition, the flame-retardant polymer composition preferably has a total smoke production (TSP) determined by a cone calorimeter test according to ISO 5660-1 of 0.3 to 7.5 m 2 , preferably 0.5 to 6.5 m 2 , more preferably 0.7 to 5.5m 2 It is desirable that it is.

[0135] Accordingly, the flame-retardant polymer composition according to the present invention exhibits excellent flame-retardant properties along with improved mechanical properties for tensile strength, elongation at break, and tear strength, and preferably meets the requirements of the ST12 jacket described in IEC 60840:2020 "Power cables with extruded insulators and accessories for rated voltages exceeding 30kV (Um = 36kV) up to 150kV (Um = 170kV) - Test methods and requirements" (Um = maximum allowable voltage).

[0136] article

[0137] The present invention also relates to articles comprising the flame-retardant polymer composition described above or below in all aspects and embodiments thereof.

[0138] The article is preferably a wire or cable comprising at least one layer comprising a flame-retardant polymer composition.

[0139] According to a preferred embodiment of the present invention, at least one layer obtained from the polyolefin composition of the present invention can be crosslinked.

[0140] Wires or cables can be produced by co-extruding various layers onto a conductive core. Subsequently, crosslinking is preferably performed by moisture curing when component (A) comprises a comonomer unit containing a crosslinkable silane group, wherein the silane group is hydrolyzed under the influence of water or steam. It is preferable to perform moisture curing in a sauna or water bath at a temperature of 70 to 100°C or under ambient conditions.

[0141] The flame-retardant polymer composition according to the present invention can be extruded around a wire or cable to form an insulating layer or a jacket layer, or can be used as a bedding compound.

[0142] Subsequently, the flame-retardant polymer composition is optionally crosslinked.

[0143] According to a preferred embodiment, the wire or cable preferably comprises a material selected from the group consisting of cross-linked or thermoplastic polyethylene, thermoplastic polypropylene, or flame-retardant polyolefin, or an insulating layer composed thereof. Suitable flame-retardant polyolefins are described in particular in WO 2013 / 159942 A2. Suitable thermoplastic insulators are disclosed, for example, in WO 2007 / 137711 A1 or WO 2013 / 1599442 A2 and are commercially available, for example, from Borealis AG (Austria) under the trade names FR4802, FR4803, FR4807, FR6082, FR6083, and FR4804. Commercially available cross-linked insulating materials are also available from Borealis AG (Austria) under the trade names FR4450 and FR4451.

[0144] The thickness of the insulation layer of a low-voltage power cable may be in the range of 0.4 mm to 3.0 mm depending on the application, preferably less than 2.0 mm. Preferably, the insulation is coated directly onto an electrical conductor.

[0145] In a preferred embodiment, the flame-retardant polymer composition according to the present invention is included in the jacket layer of a wire or cable, preferably in the jacket layer of a medium voltage (MW) or high voltage (HV) cable.

[0146] MW and HV cables generally have a conductor surrounded by an inner semiconducting layer, an insulation layer, an outer semiconducting layer, and a jacket layer which is a protective outer layer. MW and HV cables differ mainly in the thickness of the insulation layer.

[0147] MW cables are generally classified into maximum allowable voltages of 1kV to 36kV.

[0148] HW cables are generally classified into maximum allowable voltages of 36kV to 230kV.

[0149] All preferred aspects and embodiments of the flame-retardant polymer composition described above should also apply to articles according to the present invention.

[0150] use

[0151] In addition, the present invention relates to the use of the flame-retardant polymer composition described above or below for the manufacture of articles such as a flame-retardant layer of a wire or cable.

[0152] All preferred aspects and embodiments of the flame-retardant polymer composition and article as described above shall be maintained for the article according to the present invention.

[0153] Experimental section

[0154] a) measurement method

[0155] Unless otherwise defined, the following definitions of terms and determination methods apply to the above general description of the invention as well as to the following examples.

[0156] Meltflow Rate (MFR)

[0157] MFR was measured according to ISO 1133 (Davenport R-1293 of Daventest Ltd).

[0158] The MFR values ​​for polyethylene at 190°C are 2.16 kg (MFR2), 5.0 kg (MFR5), and 21.6 kg (MFR 21 It was measured at three different loads.

[0159] In the case of polypropylene, the melt flow rate is measured at a temperature of 230°C and the same load.

[0160] density

[0161] Density was measured according to ISO 1183-1 - Method A (2019). Sample preparation was performed via compression molding according to ISO 1872-2:2007.

[0162] Comonomer content of component (A)

[0163] Quantification of microstructure using NMR spectroscopy

[0164] The comonomer content of the polymer was quantified using quantitative nuclear magnetic resonance (NMR) spectroscopy.

[0165] Quantitative 1 H NMR spectra were recorded in the molten state using a Bruker Avance III 500 NMR spectrometer operating at 500.13 MHz. All spectra were recorded at 150°C using nitrogen gas for all pneumatic devices. 13 C was recorded using an optimized 7 mm Magic-Angle Spinning (MAS) probe head. Approximately 200 mg of material was packed into a zirconia MAS rotor with an outer diameter of 7 mm and spun at 4 kHz. This setup was selected primarily for the high sensitivity required for rapid identification and accurate quantification (klimke06, parkinson07, Castignolles09). Standard single-pulse excitation was used with a recirculation delay of 2 seconds {pollard04, klimke06}. A total of 16 transients were acquired per spectrum.

[0166] Quantitative 1 H NMR spectra were processed, integrated, and quantitatively characterized using a customized spectral analysis automation program. All chemical shifts internally referenced a bulk ethylenemethylene signal of 1.33 ppm.

[0167] Assignment for Methyl Acrylate (MA) Incorporation {brandolini01}:

[0168]

[0169] Characteristic signals resulting from the incorporation of methyl acrylate were observed in various possible comonomer sequences. Total methyl acrylate incorporation was quantified using a signal integral of 3.6 ppm assigned to the 1 MA site, which accounts for the number of reported nuclei per comonomer.

[0170] MA = I1MA / 3

[0171] Bulk aliphatic (l) with an ethylene content between 0.00 and 3.00 ppm bulk It was quantified using the integration of the signal. The total ethylene content was calculated based on the bulk integration and compensation for the observed comonomers.

[0172] E = (1 / 4)*[I bulk - 3*MA]

[0173] The total mole fraction of methyl acrylate in the polymer was calculated as follows.

[0174] fMA = MA / (E + MA)

[0175] The total comonomer incorporation (mol%) of methyl acrylate was calculated from the mole fraction using the standard method.

[0176] MA [mol%] = 100 * fMA

[0177] The total comonomer incorporation (weight%) of methyl acrylate was calculated from the mole fraction using the standard method.

[0178] MA [weight%] = 100 * (fMA * 86.09) / ((fMA * 86.09) + ((1-fMA) * 28.05)

[0179]

[0180] Central particle size (d 50 )

[0181] The median particle size of metal hydroxides can be measured by laser diffraction (ISO 13320), dynamic light scattering (ISO 22412), or sieve analysis (ASTM D 1921-06). For the metal hydroxides used in the working examples, the median particle size d 50 The determination was performed by laser diffraction. Any limitation of the claims must refer to values ​​obtained from laser diffraction (ISO 13320).

[0182] BET surface

[0183] The BET surface is determined according to ISO 9277 (2010).

[0184] Manufacture of tapes used for measuring tensile strength and elongation at break

[0185] To measure tensile strength and elongation at break, a tape (1.8 mm) was manufactured in a Collin TeachLine E20T tape extruder using a 4.2:1, 20D compression screw with a diameter of 20 mm. The temperature profile was 150 / 160 / 170℃, and the screw speed was 55 rpm.

[0186] Tensile test

[0187] Tensile tests were performed using an Alwetron TCT 10 tensile testing machine according to ISO 527-1 and ISO 527-2. Ten test specimens were punched from plaques using ISO 527-2 / 5A specimens and placed in a climate room at 23°C with a relative humidity of 50 ± 5% for at least 16 hours prior to testing.

[0188] For conditioning, 10 test specimens were additionally placed in a climate room at a temperature of 110°C for at least 240 hours prior to testing.

[0189] The test specimens were placed vertically between a clamp at a distance of 50 ± 2 mm, an extensometer clamp at a distance of 20 mm, and a 1 kN load cell. Before performing the test, the exact width and thickness of all samples were measured and recorded. Each sample rod was subjected to a tensile test at a constant speed of 50 mm / min until fracture, with at least 6 approved parallels performed. Since there is generally significant variation in results in high-fill systems, a single value for the elongation at break (%) and tensile strength (MPa) was extracted using the median.

[0190] Tear resistance (determined by Elmendorf tear (N):

[0191] Tear resistance was measured according to BS6469, Section 99.1:1992, HD 605 S2:2008 Section 2.2.2.2 Method 2.

[0192] This method describes a method for measuring tear resistance in sheathing materials, 1 mm thick cable samples, or compression-molded nameplates. Using a cut test specimen, the tear force is measured by a tensile machine at a speed of 500 mm / min and a distance of 50 mm between the tensile test clamps. Tear resistance is calculated by dividing the maximum force required to tear the sample by the thickness of the sample.

[0193] compression molding

[0194] Nameplates were prepared for the limited oxygen index and vertical combustion tests using compression molding (Collin R 1358, Edition: 2 / 060510) in accordance with ISO 293. Pellet was compressed between two Mylar film sheets and placed in a specific frame of the correct shape and size (3x100x100 mm). The sample was compressed by applying a pressure of 20 bar for 1 minute at 170°C, followed by a pressure of 200 bar for 5 minutes at the same temperature. The remaining compression was performed at the same high pressure for 9 minutes at a cooling rate of 15°C / min. The amount of pellets used for each nameplate was calculated using the density of the material exceeding 10 wt%.

[0195] flame retardant

[0196] Flame retardancy was measured by peak heat release rate (pHRR) and total smoke release (TSP) in a cone calorimeter test according to ISO 5660-1.

[0197] A cone calorimeter is a device used to study the fire behavior of small samples composed of various materials in the condensed phase. It is widely used in the field of fire safety engineering. It collects data regarding ignition time, mass loss, combustion products, heat release rate, and other parameters related to combustion characteristics. The device typically exposes fuel samples to various heat fluxes on the surface. The principle of measuring the heat release rate is based on the fact that the total heat of combustion of an organic material is directly related to the amount of oxygen required for combustion.

[0198] A 3x100x100mm sample was prepared via compression molding. Then, 35kW / m 2 A cone test was performed using a constant heat flux and a distance of 60 mm between the sample and the cone heater. Peak heat emission is the maximum heat emission during the cone fire test. The generation of black smoke is measured by a laser in the cone duct.

[0199] b) Materials used

[0200] Ingredient (A)

[0201] "EMA" has an MFR2 of 0.4 g / 10 min and a density of 944 kg / m³ 3 It is a copolymer of ethylene and methyl acrylate (weight ratio = 75:25) and is marketed by DuPont (USA) under the name Elvaloy® AC 1125.

[0202] Ingredient (B)

[0203] "LLDPE-MAH" is maleic anhydride (maleic anhydride content = 0.5~1.0 wt%, MFR2 = 2.0 g / 10 min, density = 930 kg / m³) 3 Linear low-density polyethylene grafted with ), which is commercially available from HDC Hyundai EP Co., Ltd. under the trade name Polyglue® GE300C.

[0204] Component (C)

[0205] "OMS-1" is a masterbatch containing 50% by weight of organically modified siloxane in an LDPE matrix, marketed as Tegomer® 6264 by Evonik Nutrition & Care GmbH (Germany).

[0206] "OMS-2" is a pure liquid organic modified siloxane (identical to OMS-1) marketed as Tegomer® V-Si-4042 by Evonik Nutrition & Care GmbH (Germany).

[0207] Ingredient (D)

[0208] "MDH-1" is d 50 It is 3.5 μm, and the specific surface area is 7–10 m² 2 Brucite (ground magnesium hydroxide) (Ecopiren® 3.5C), which is in the range of / g and coated with 2 wt% stearic acid, is produced and marketed by Europiren BV (Netherlands).

[0209] The chemical composition is Mg(OH)2 > 92.8 wt%, CaO < 2.3 wt%, SiO2 < 1.3 wt%, and Fe2O3 < 0.13 wt%.

[0210] Ingredient (E)

[0211] "VLDPE" has a density of 883 kg / m³ 3 It is an ultra-low density copolymer of ethylene and 1-octene with an MFR2 of 1.1 g / 10 min, and is marketed as Queo 8201 by Borealis AG (Austria).

[0212] Ingredient (F)

[0213] "HDPE-1" has a density of 949 kg / m³ 3 It is a natural high-density copolymer of ethylene and 1-hexene with an MFR5 of 0.23 g / 10 min, and is marketed by Borealis AG (Austria) as HE3493-LS-H.

[0214] "HDPE-2" is 944 kg / m² 3It is a natural high-density copolymer of ethylene and 1-butene with a density of 1.7 g / 10 min MFR2 and 5.1 g / 10 min MFR5, and is marketed as HE6068 by Borealis AG (Austria). Since HDPE-2 has a higher MFR5 than claimed, it is considered a component relative to component (F).

[0215] Ingredients (G)

[0216] "CBMB" is a carbon black masterbatch with a density of 1135 kg / m³ 3 It is a thermoplastic black polyethylene compound marketed as Borlink LE7710 by Borealis AG (Austria).

[0217] Additional components

[0218] "AO" is a high molecular weight sterically hindered phenolic antioxidant marketed as lrganox 1010 by BASF SE.

[0219] "UV" is a synergistic mixture of Chimassorb 944 and Tinuvin 622, used as a light stabilizer, and is marketed by BASF SE as Tinuvin 783 FDL.

[0220] c) Preparation of a flame-retardant polymer composition

[0221] The polymer compositions according to the embodiments (IE1 to IE3) and comparative examples (CE1 to CE6) of the present invention were prepared by mixing the components together in a BUSS-co-kneader (46 mm) at a screw speed of 225 rpm and a setting of 180°C in Zone 1 and 160°C in Zone 2. The mixer screw was heated to 120°C. The extruder screw temperature was 160°C, the barrel was heated to 170°C, and the speed was 4 rpm. All components were added to Port 1. The amounts of different components in the polymer composition and the characteristics of the polymer compositions according to the embodiments and comparative examples of the present invention are listed in Table 1 below. The characteristics of the embodiments are also shown in Table 1.

[0222] It can be seen that Comparative Example CE6, which reflects Example IE2 of WO 2021 / 111006 A1, exhibits inferior mechanical properties compared to Examples IE1-IE3 of the present invention.

[0223] Comparative Example CE5, which is not within the scope of the present invention and differs in that it uses a smaller amount of another component (F), exhibits inferior mechanical properties and poor pHRR flame retardancy properties compared to Examples IE1-IE3 of the present invention.

[0224] Comparative examples CE1-CE4, which differ from the embodiments of the present invention in having a smaller amount of component (F), all exhibit lower tear strength after conditioning, particularly at 50°C, compared to embodiments IE1-IE3 of the present invention, and exhibit a higher change in mechanical properties, particularly in elongation at break.

[0225] Table 1: Composition and characteristics of the examples

[0226]

Claims

Claim 1 (A) 2.0 to 15.0 wt% of an ethylene copolymer comprising a unit selected from the group consisting of methyl acrylate, methyl methacrylate, or mixtures thereof; (B) 0 to 4.0 wt% of polypropylene and / or polyethylene containing a unit derived from maleic anhydride; (C) 0.1 to 3.0 wt% of silicone fluid and / or silicone gum; (D) 40.0 to 55.0 wt% of magnesium hydroxide; (E) a copolymer of ethylene and an alpha-olefin comonomer unit having 4 to 10 carbon atoms (density determined according to ISO 1183 860 to 910 kg / m³ 3 (having) 2.0~15.0 wt%; (F) copolymer of ethylene and alpha-olefin comonomer units having 4~10 carbon atoms (density determined according to ISO 1183 920~965 kg / m³ 3 A flame-retardant polymer composition comprising (g) 18.0 to 35.0 wt% (having a melt flow rate MFR 50.05 to 2.50 g / 10 min determined according to ISO 1133 at a temperature of 190°C and a load of 5.0 kg) and carbon black 0 to 8.0 wt% (wherein all weight percentages are based on the total weight of the flame-retardant polymer composition). Claim 2 In paragraph 1, component (A) has a density of 920 to 960 kg / m³ determined according to ISO 1183. 3 A flame-retardant polymer composition having a melt flow rate MFR2 determined according to ISO 1133 at a temperature of 190°C and a load of 2.16 kg in the range of 0.1 to 10 g / 10 min. Claim 3 In claim 1 or 2, the component (A) further comprises a unit having a hydrolyzable silane group, wherein the unit having a hydrolyzable silane group is a flame-retardant polymer composition represented by the chemical formula (I):R 1 SiR 2 q Y 3-q (I) Here R 1 is an ethylene-based unsaturated hydrocarbyl, hydrocarbyloxy, or (meth)acryloxyhydrocarbyl group, and each R 2 is independently an aliphatic saturated hydrocarbyl group, Y is a hydrolyzable organic group which may be the same or different, and q is 0, 1, or 2. Claim 4 In claim 1 or 2, component (B) has a density of 910 to 950 kg / m³ determined according to ISO 1183. 3 A flame-retardant polymer composition having a melt flow rate MFR2 determined according to ISO 1133 in the range of 0.5 to 5.0 g / 10 min at a temperature of 190°C for polyethylene or 230°C for polypropylene and a load of 2.16 kg. Claim 5 A flame-retardant polymer composition according to claim 1 or 2, wherein component (C) is a silicone gum or silicone fluid selected from the group consisting of polysiloxane, siloxane containing an alkoxy or alkyl functional group and mixtures thereof. Claim 6 A flame-retardant polymer composition according to claim 1 or 2, wherein component (D) is ground or precipitated magnesium hydroxide. Claim 7 A flame-retardant polymer composition according to claim 1 or 2, wherein component (E) is a copolymer of ethylene and 1-octene. Claim 8 A flame-retardant polymer composition according to claim 1 or 2, wherein component (F) is a copolymer of ethylene and 1-hexene. Claim 9 A flame-retardant polymer composition according to claim 1 or 2, comprising: 3.0 to 14.0 wt% of component (A); 0.5 to 3.5 wt% of component (B); 0.3 to 2.8 wt% of component (C); 42.5 to 53.5 wt% of component (D); 3.0 to 14.0 wt% of component (E); 20.0 to 32.5 wt% of component (F); 0 to 7.5 wt% of a carbon black masterbatch comprising 30 to 50 wt% carbon black (G) in a polyethylene matrix based on the total weight of the carbon black masterbatch; and 0.05 to 2.5 wt% of an additive selected from the group consisting of slip agents, UV stabilizers, antioxidants, additive carriers, nucleating agents, mica, scorch retardants, and mixtures thereof (wherein all weight percentages are based on the total weight of the flame-retardant polymer composition). Claim 10 A flame-retardant polymer composition having one or more of the following characteristics in claim 1 or 2: Tensile strength of 12.5 MPa to 25.0 MPa as determined according to ISO 527-1 and ISO 527-2; Tensile strength of 12.5 MPa to 25.0 MPa determined after conditioning the specimen at 110°C for 240 hours according to ISO 527-1 and ISO 527-2; A change in tensile strength of -5.0% to +5.0% as the ratio of tensile strength before conditioning to tensile strength after conditioning; Elongation at break of 350% to 550% as determined according to ISO 527-1 and ISO 527-2; Breaking elongation of 300% to 500%, determined after conditioning the specimen at 110°C for 240 hours according to ISO 527-1 and ISO 527-2; A change in fracture elongation of 0% to 20.0% as the ratio of fracture elongation before conditioning to fracture elongation after conditioning; Tear strength at 23°C of 8.5 to 25.0 N / mm, determined at 23°C according to BS 6469 Section 99.1:1992, HD 605 S2:2008 Section 2.2.2.2 Method 2; and / or Tear strength at 50°C of 8.5 to 20.0 N / mm determined at 50°C according to BS 6469 Section 99.1:1992, HD 605 S2:2008 Section 2.2.2.2 Method 2. Claim 11 A flame-retardant polymer composition having one or more of the following characteristics in claim 1 or 2: 75 ~ 250 kW / m² determined by cone calorimetry testing according to ISO 5660-1 2 Peak thermal ejection rate (pHRR); and / or 0.3~7.5m determined by cone calorimetry testing according to ISO 5660-1 2 Total Smoke Production (TSP). Claim 12 Article comprising a flame-retardant polymer composition according to paragraph 1 or 2. Claim 13 An article comprising a flame-retardant polymer composition according to claim 1 or 2, wherein the article is a wire or cable comprising at least one layer comprising the flame-retardant polymer composition according to claim 1 or 2. Claim 14 Article 13, wherein the layer is a jacket layer. Claim 15 delete

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