Polypropylene composition with improved UV stability and expanding flame retardant

Abstract

The present invention relates to a polypropylene composition comprising a propylene polymer; a halogen-free flame retardant containing nitrogen and phosphorus; a pigment; and an additive, wherein the additive (d) comprises at least one hindered amine light stabilizer (HALS) having at least one ester group, and at least one acid scavenger. The present invention further relates to articles comprising the polypropylene composition, and to improvements in the UV stability of polypropylene compositions comprising a halogen-free flame retardant containing nitrogen and phosphorus.

Description

Technical Field

[0001] The present disclosure relates to a polypropylene composition, an article containing the polypropylene composition, and an improvement in the UV stability of a polypropylene composition containing a halogen-free flame retardant containing nitrogen and phosphorus.

Background Art

[0002] Articles containing polymer materials used outdoors should be durable against weather conditions that can be extreme in certain geographical areas. In particular, UV resistance and mechanical stability under extremely varying temperatures are required. In some cases, long-term thermal stability at high temperatures may be needed. In the case of articles containing polymer materials such as polypropylene (PP), it is usually achieved by adding UV stabilizers, antioxidants and other additives. Furthermore, in many applications, the polymer material needs to meet certain flammability criteria. Therefore, the polymer material may further contain a large amount of at least one flame retardant. However, certain flame retardants are known to interact with UV stabilizers and cause degradation. Therefore, it is necessary to improve the UV stability of polypropylene compositions, especially those containing flame retardants. Patent Document 1 discloses a long glass fiber reinforced polypropylene material containing a flame retardant, a heat stabilizer and a lubricant. This material contains a light stabilizer selected from hindered amine light stabilizers (HALS), salicylate UV absorbers, benzophenone UV absorbers, benzotriazole UV absorbers and triazine UV absorbers.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The UV stability of polypropylene compositions containing halogen-free flame retardants containing nitrogen and phosphorus is improved by a specific combination of UV stabilizers, namely a combination comprising at least (i) a hindered amine light stabilizer (HALS) having at least one ester group and (ii) an acid scavenger. A hindered amine light stabilizer having at least one ester group is also called an ester HALS. This disclosure also provides polypropylene compositions with improved UV stability and articles containing polypropylene compositions. [Modes for carrying out the invention]

[0005] This disclosure relates to a polypropylene composition, the following: (a) 20-75% by mass of propylene polymer; (b) A halogen-free flame retardant containing 20-30% by mass of nitrogen and phosphorus; (c) 0.2 to 2.0% by mass of pigment; and (d) Additives in an amount of 0.2 to 5.0% by mass; This is included in the total amount (100% by mass) of the polypropylene composition, where, The additive (d) is as follows: (d1) 0.1 to 1.0 mass% of at least one hindered amine light stabilizer (HALS) having at least one ester group; and (d2) 0.1 to 1.0% by mass of at least one acid scavenger; This is included in proportion to the total amount (100% by mass) of the polypropylene composition. While we do not wish to be bound by theory, it is thought that at least one acid scavenger would act to protect HALS containing ester groups from the harmful effects of halogen-free flame retardants containing nitrogen and phosphorus. The acidity of such flame retardants is high and therefore readily catalyzes the hydrolysis of ester groups in HALS under wet or slightly wet conditions.

[0006] In one embodiment, the polypropylene composition is as follows: (a) 20-75% by mass of propylene polymer; (b) A halogen-free flame retardant containing 20-30% by mass of nitrogen and phosphorus; (c) 0.2 to 2.0% by mass of pigment; and (d) Additives in an amount of 0.2 to 5.0% by mass; This is included in the total amount (100% by mass) of the polypropylene composition, where, The additive (d) is as follows: (d1) 0.1 to 1.0% by mass of at least one hindered amine light stabilizer having at least one ester group; (d2) 0.1 to 1.0% by mass of at least one acid scavenger; and (d3) 0.1 to 0.8% by mass of at least one UV absorber containing a phenolic hydroxyl group, (d3) optionally 0.1 to 0.5% by mass of at least one antioxidant; and (d4) In some cases, 0.1 to 0.5 mass% of at least one metal deactivator This is included in proportion to the total amount (100% by mass) of the polypropylene composition. Preferably, the polypropylene composition is a glass fiber reinforced polypropylene composition. In this case, the polypropylene composition is as follows: (a) 20-60% by mass of propylene polymer; (aa) 10-50% by mass of glass fiber; (ab) 1-5% by mass of an adhesion promoter; (b) A halogen-free flame retardant containing 20-30% by mass of nitrogen and phosphorus; (c) 0.2 to 2.0% by mass of pigment; and (d) Additives in an amount of 0.2 to 5.0% by mass; This is included in the total amount (100% by mass) of the polypropylene composition, where, The additive (d) is as follows: (d1) 0.1 to 1.0% by mass of at least one hindered amine light stabilizer having at least one ester group; and (d2) 0.1 to 1.0% by mass of at least one acid scavenger; This is included in proportion to the total amount (100% by mass) of the polypropylene composition. When the polypropylene composition is a glass fiber reinforced polypropylene composition, preferably, the melt flow rate MFR2 (230 ° C / 2.16 kg) of the polypropylene polymer is 60 g / 10 min or more, preferably in the range of 60 to 1000 g / 10 min, more preferably in the range of 60 to 500 g / 10 min, even more preferably in the range of 60 to 200 g / 10 min, as measured according to ISO 1133.

[0007] In a further preferred embodiment, the polypropylene composition is a glass fiber reinforced polypropylene composition and comprises the following: (a) 20 to 60% by mass of a polymer of propylene; (aa) 10 to 50% by mass of glass fibers; (ab) 1 to 5% by mass of an adhesion promoter; (b) 20 to 30% by mass of a halogen-free flame retardant containing nitrogen and phosphorus; (c) 0.2 to 2.0% by mass of a pigment; and (d) 0.2 to 5.0% by mass of an additive; wherein the total amount of the polypropylene composition (100% by mass) is included, where the (d) additive is the following: (d1) 0.1 to 1.0% by mass of at least one hindered amine light stabilizer having at least one ester group; (d2) 0.1 to 1.0% by mass of at least one acid scavenger; and (d3) 0.1 to 0.8% by mass of at least one UV absorber containing a phenolic hydroxyl group, in the case of (d3), 0.1 to 0.5% by mass of at least one antioxidant; and (d4) optionally, 0.1 to 0.5% by mass of at least one metal deactivator is included with respect to the total amount of the polypropylene composition (100% by mass).

[0008] Also, the polypropylene composition according to the present invention may be a glass fiber reinforced polypropylene composition and comprises the following: (a) 20 to 60% by mass of a polymer of propylene; (aa) 10 to 50% by mass of glass fiber; (ab) 1 to 5% by mass of an adhesion promoter; (b) 20 to 30% by mass of a halogen-free flame retardant containing nitrogen and phosphorus; (c) 1.5 to 15% by mass, preferably 2.0 to 10% by mass of a pigment masterbatch; and (d) 0.2 to 5.0% by mass of an additive; which is contained with respect to the total amount (100% by mass) of the polypropylene composition, where the (d) additive is as follows: (d1) 0.1 to 1.0% by mass of at least one hindered amine light stabilizer having at least one ester group; (d2) 0.1 to 1.0% by mass of at least one acid scavenger; and (d3) 0.1 to 0.8% by mass of at least one UV absorber containing a phenolic hydroxyl group, in the case of (d3), 0.1 to 0.5% by mass of at least one antioxidant; and (d4) in some cases, 0.1 to 0.5% by mass of at least one metal deactivator which is contained with respect to the total amount (100% by mass) of the polypropylene composition.

[0009] Propylene polymer (a) The polypropylene composition of the present disclosure contains 20 to 75% by mass, preferably 20 to 60% by mass, more preferably 20 to 55% by mass, and most preferably 30 to 50% by mass of polypropylene with respect to the total amount (100% by mass) of the polypropylene composition. Hereinafter, the "polymer of propylene" (a) is also referred to as "polypropylene" (a). In preferred embodiments, the melt flow rate MFR2 (230°C / 2.16 kg) of the propylene polymer (a) in the polypropylene composition of the present invention is characterized as 10 to 200 g / 10 min when measured according to ISO 1133. When glass fibers are not present in the polypropylene composition, preferably the melt flow rate MFR2 (230°C / 2.16 kg) of the propylene polymer is 10 to 60 g / 10 min, preferably 15 to 35 g / 10 min, when measured according to ISO 1133. Alternatively, if the polypropylene composition is a glass fiber reinforced polypropylene composition, the melt flow rate MFR2 (230°C / 2.16kg) of the propylene polymer, when measured according to ISO 1133, may be 60 g / 10 min or more, preferably in the range of 60 to 1000 g / 10 min, more preferably in the range of 60 to 500 g / 10 min, even more preferably in the range of 60 to 200 g / 10 min, particularly in the range of 80 to 150 g / 10 min, for example, in the range of 90 to 120 g / 10 min.

[0010] In a preferred embodiment, polypropylene (a) is a heterophase polyolefin composition comprising a matrix (a1) which is a propylene polymer and an elastomer (a2) which is a copolymer containing units derived from an alpha-olefin having propylene on one side and ethylene and / or 4 to 20, particularly 4 to 10, carbon atoms on the other. In the context of this invention, the term "heterophase" indicates that the elastomer is (finely) dispersed within the matrix. In other words, the elastomer forms inclusions within the matrix. Therefore, the matrix contains (finely) dispersed inclusions that are not part of the matrix, and these inclusions contain elastomers. The term "inclusions" means that the matrix and the inclusions form different phases within the heterophase polypropylene. These inclusions can be observed, for example, by high-resolution microscopy such as electron microscopy or scanning force microscopy. Heterophase polyolefin compositions generally feature a low-temperature xylene-soluble (XCS) fraction and a low-temperature xylene-insoluble (XCI) fraction. In the context of this disclosure, the low-temperature xylene-soluble (XCS) fraction of a heterophase polyolefin composition is essentially identical to the elastomer of the heterophase polyolefin composition. Therefore, when referring to the intrinsic viscosity and ethylene content of the elastomer of a heterophase polyolefin composition, it means the intrinsic viscosity and ethylene content of the low-temperature xylene-soluble (XCS) fraction of the heterophase polyolefin composition. Therefore, the matrix (a1) content, i.e., the low-temperature xylene-insoluble content (XCI) in the polypropylene (a) heterophase polyolefin composition is preferably in the range of 75.0 to 93.0% by mass, more preferably in the range of 77.0 to 91.0% by mass, for example, 78.0 to 89.0% by mass. On the other hand, the content of low-temperature xylene-soluble components (XCS) in the elastomer (a2), i.e., polypropylene (a), which is a heterogeneous polyolefin composition, is preferably in the range of 7.0 to 25.0% by mass, more preferably in the range of 9.0 to 23.0% by mass, for example, in the range of 11.0 to 22.0% by mass.

[0011] The polypropylene suitable for use as matrix (a1) may include any type of isotactic or primarily isotactic polypropylene homopolymer or random copolymer known in the art. Accordingly, the polypropylene may include a propylene homopolymer or propylene and ethylene and / or C4-C8 alpha-olefins, such as 1-butene, 1-hexene, or 1-octene, with a total comonomer content in the range of 0.05 to 10% by mass. Preferably, the melt flow rate of the polypropylene matrix (a1) is quite high. Therefore, in the present invention, when the melt flow rate MFR2 (230°C / 2.16kg) of the low-temperature xylene-insoluble (XCI) fraction of the polypropylene matrix (a1), i.e., polypropylene (a), is measured according to ISO 1133, it is preferably in the range of 100.0 to 1500.0 g / 10 min, more preferably 120.0 to 800.0 g / 10 min, and even more preferably 140.0 to 600.0 g / 10 min, for example, 150.0 to 500.0 g / 10 min.

[0012] Furthermore, the polypropylene matrix (a1) may be multimodal or bimodal in terms of molecular weight. As used throughout this disclosure, the terms “multimodal” or “bimodal” refer to the modality of a polymer, i.e., the form of the molecular weight distribution curve, which is a graph of the molecular weight fraction as a function of its molecular weight, and / or the form of the comonomer content distribution curve, which is a graph of the comonomer content as a function of the molecular weight of the polymer fraction.

[0013] The elastomer (a2) comprises (i) propylene and (ii) ethylene and / or at least other units that can be derived from C4-C20 alphaolefins, such as C4-C10 alphaolefins, and preferably consists of these. The elastomeric copolymer (E1) may further contain units derived from conjugated or unconjugated dienes such as butadiene, but preferably consists of (i) propylene and (ii) units derived solely from ethylene and / or C4-C20 alphaolefins. Suitable non-conjugated dienes, when used, include 1,4-hexadiene, 1,5-hexadiene, 1,6-octadiene, 5-methyl-1,4-hexadiene, 3,7-dimethyl-1,6-octadiene, 3,7-dimethyl-1,7-octadiene, and linear and branched acyclic dienes such as mixed isomers of dihydromyrcene and dihydroocimene, as well as monocyclic alicyclic dienes such as 1,4-cyclohexadiene, 1,5-cyclooctadiene, 1,5-cyclododecadiene, 4-vinylcyclohexene, 1-allyl-4-isopropylidenecyclohexane, 3-allylcyclopentene, 4-cyclohexene, and 1-isopropenyl-4-(4-butenyl)cyclohexane. Polycyclic alicyclic condensed and crosslinked ring dienes containing alkenyls, alkylides, cycloalkenyls and cycloalkylidene norbornene, such as tetrahydroindene, methyltetrahydroindene, dicyclopentadiene, bicyclo(2,2,1)hepta-2,5-diene, 2-methylbicycloheptadiene, and alkenyls, alkylides, cycloalkenyls and cycloalkylidene norbornene, including 5-methylene-2-norbornene, 5-isopropylidenenorbornene, 5-(4-cyclopentenyl)-2-norbornene and 5-cyclohexylidene-2-norbornene, are also suitable. Preferred non-conjugated dienes are 5-ethylidene-2-norbornene, 1,4-hexadiene and dicyclopentadiene. Therefore, elastomer (a2) comprises at least units derivable from propylene and ethylene, and may also comprise other units derivable from further alpha-olefins as defined above. Preferably, elastomer (a2) comprises only units derivable from propylene and ethylene, and optionally from conjugated dienes such as butadiene, or unconjugated dienes as defined above, such as 1,4-hexadiene. Therefore, elastomer (a2) is particularly preferably ethylene-propylene unconjugated diene monomer polymer (EPDM), and most preferably ethylene-propylene rubber (EPR). Similar to the matrix (a1), the elastomer (a2) can be unimodal or multimodal, such as bimodal. See above for the definitions of unimodal and multimodal, such as bimodal.

[0014] The content of units derived from propylene in the elastomer (a2) of this disclosure corresponds to the content of propylene detectable in the low-temperature xylene-soluble component (XCS) fraction. Therefore, the amount of propylene detectable in the low-temperature xylene-soluble (XCS) fraction is in the range of 45.0 to 75.0% by mass, more preferably 40.0 to 70.0% by mass. Accordingly, in certain embodiments, the elastomer (a2), i.e., the low-temperature xylene-soluble component (XCS) fraction, contains 25.0 to 65.0% by mass, more preferably 30.0 to 60.0% by mass of elastomer (a2). Preferably, the elastomer (a2) is an ethylene propylene unconjugated diene monomer polymer (EPDM) or ethylene propylene rubber (EPR), the latter being particularly preferred, with the propylene and / or ethylene content defined above.

[0015] A further preferred requirement of this disclosure is that the intrinsic viscosity (IV) of the low-temperature xylene-soluble (XCS) fraction of the heteromorphic polyolefin composition polypropylene is considerably low. Therefore, it is understood that the intrinsic viscosity of the low-temperature xylene-soluble component (XCS) fraction of the heteromorphic polyolefin composition polypropylene is less than 3.5 dl / g, more preferably 3.4 dl / g or less. Even more preferably, the intrinsic viscosity of the low-temperature xylene-soluble component (XCS) fraction of the heteromorphic polyolefin composition polypropylene is in the range of 1.8 to 3.5 dl / g, more preferably in the range of 1.9 to 3.4 dl / g, for example, 2.0 to 3.4 dl / g. The intrinsic viscosity is measured in decalin at 135°C according to ISO 1628. Preferably, the propylene content of polypropylene (a) is 85.0 to 96.0% by mass, more preferably 88.0 to 94.0% by mass, based on the combined amount of matrix (a1) and elastomer copolymer (a2) relative to the total amount of polypropylene (a), when polypropylene (a) is the heterogeneous polyolefin composition defined above. In one embodiment of the polypropylene composition of this disclosure, the propylene polymer (a) is a heteromorphic copolymer of propylene. The heteromorphic copolymer of propylene may comprise a polypropylene matrix component (a1) and an elastic propylene copolymer component (a2) dispersed in the polypropylene matrix (a1) and comprising (i) propylene and (ii) units derived from ethylene and / or C4-C20 olefins. Preferably, the melt flow rate MFR2 (230°C / 2.16 kg) of the heteromorphic polymer of propylene is in the range of 60-200 g / 10 min when measured according to ISO 1133. Examples of suitable propylene polymers include, but are not limited to, BF970MO and BJ400HP, which are commercially available from Borealis AG (Austria). These commercial products may already contain small amounts (e.g., up to 2.0% by mass, more preferably up to 1.0% by mass) of one or more additives, such as the additive (d) defined below, except for the combination of NOR-HALS (d1) and an acid scavenger (d2) based on the total amount of propylene polymer.

[0016] Glass fiber (aa) The polypropylene composition of the present invention may optionally contain (aa) 10 to 50% by mass of glass fibers relative to the total amount of the polypropylene composition. In one embodiment, the polypropylene composition contains 14 to 40% by mass, preferably 18 to 36% by mass of glass fibers, based on the total amount (100% by mass) of the polypropylene composition. In the presence of glass fibers, the improvement in UV stability of the polypropylene composition due to the presence of acid scavengers is even more pronounced. Although not bound by theory, it is thought that glass fiber-filled polypropylene compositions may have higher water penetration into the material due to the presence of multiple microdefects on the surface. Therefore, ester functional groups in HALS containing at least one ester group are susceptible to hydrolysis due to vigorous contact with water in the glass fiber-filled polypropylene composition. Consequently, the protective effect of at least one acid scavenger becomes higher and easier to track.

[0017] Preferably, the glass fiber (aa) is short glass fiber (SGF), preferably chopped glass fiber or crushed strand and / or long glass fiber (LGF), preferably long glass fiber obtained from glass roving. In one embodiment, the glass fiber (aa) is short glass fiber (SGF) or crushed strand. In particular, the glass fiber is short glass fiber (SGF). The glass short fibers (SGF), particularly crushed glass fibers or crushed strands, used in the polypropylene composition of the present invention may be characterized by having an average fiber diameter of 9.0 to 15.0 μm, preferably 10 to 13 μm, as measured according to ISO 1888:2006(E) Method B. Furthermore, the glass short fibers preferably have an average length (also called "initial average length") measured before melt-blending with the components of the polypropylene composition in the range of 2.0 to 10.0 mm, more preferably 2.3 to 9.0 mm, even more preferably 2.5 to 8.0 mm, for example, in the range of 3.0 to 7.0 mm. The initial average length of the glass short fibers (SGF), particularly crushed glass fibers or crushed strands, is usually provided by the manufacturer. Furthermore, the mass-average fiber length determined according to FASEP after melt-mixing with the components of the polypropylene composition may be in the range of 0.2 to 1.2 mm, more preferably 0.25 to 1.0 mm, and even more preferably 0.3 to 0.8 mm. The mass-average fiber length and fiber length distribution were determined according to the FASEP (Faser (German; fiber) Separation) method for injection-molded specimens prepared according to EN ISO 1873-2. Fibers are separated from the polymer matrix by thermal decomposition in a TGA oven (625°C for glass fibers, 500°C for carbon fibers) or by solution and physical separation. The separated fibers are suspended in deionized water, and the suspension is diluted until the number of fibers and fiber overlap are in equilibrium. The average fiber length is determined by grayscale image processing using FASEP 1.9.44.0 (IDM Systems, Darmstadt, Germany), and the average fiber length and fiber length distribution are statistically investigated by calculation. Accurate results are achieved for images of a small number of fiber clusters and fibers cut in any way. This is achieved by maintaining a certain ratio of fiber to water. This ratio should be less than 30 mg / L for glass fibers and less than 20 mg / L for carbon fibers. The number of clusters relative to free fibers should be less than 20% for short fibers and less than 15% for long fibers.For evaluation, FASEP software (ImageProPlus including the FASEP module) is used to separate fibers from the background, remove dust and other irrelevant features, separate overlapping fibers, and automatically measure the length of each fiber. Preferably, the initial aspect ratio (measured before melt blending with the components of the polypropylene composition) of the glass short fibers (SGF), particularly the crushed glass fibers or crushed strands, is 125 to 650, preferably 150 to 500, and more preferably 200 to 450. The aspect ratio is the relationship between the average length and average diameter of the fibers. The initial average length and initial average aspect ratio of glass short fibers (SGF), particularly crushed glass fibers or crushed strands, refer to the raw material values ​​provided by the manufacturer.

[0018] In one embodiment of the polypropylene composition of the present disclosure, the glass fibers (aa) are cut glass fibers having an average fiber diameter of 9.0 to 15.0 μm and an initial average length of 3.0 to 7.0 mm, as measured before melt-blending with the components of the polypropylene composition, as determined according to ISO 1888:2006(E) Method B. Suitable glass fibers are preferably E-glass with a diameter of 10-13 μm and crushed to 3.5-4.5 mm. Commercially available options include 13 μm crushed E-glass derived from Johns Manville Thermoflow CS EC 13 636 with a cut length of 4.0 mm, or 13 μm crushed E-glass derived from 3B, such as 3B-DS2200-13P, with a cut length of 4.0 mm.

[0019] Adhesion promoter (ab) The polypropylene compositions of this disclosure may optionally contain (ab) 1 to 5% by mass of an adhesion promoter (also known as a glass fiber compatibilizer). The adhesion promoter is preferably present only when the polypropylene composition contains glass fibers. The adhesion promoter (ab) can be any adhesion promoter suitable for polypropylene resins. The adhesion promoter is preferably a polar-modified polypropylene (PM-PP) homopolymer or copolymer. Polarized modified polypropylene (PM-PP) homopolymers or copolymers contain low molecular weight compounds with reactive polar groups. Modified polypropylene homopolymers and copolymers, such as copolymers of propylene and ethylene, or copolymers of other alpha-olefins, such as C4-C10 alpha-olefins, are most preferred because they are highly compatible with the polypropylene resins of the polypropylene compositions of this disclosure. In terms of structure, polar-modified polypropylene (PM-PP) homopolymers or copolymers are preferably selected from graft homopolymers or copolymers. In this regard, polar-modified polypropylene (PM-PP) homopolymers or copolymers containing groups derived from polar compounds, particularly those selected from the group consisting of acid anhydrides, carboxylic acids, carboxylic acid derivatives, primary and secondary amines, hydroxyl compounds, oxazolines and epoxides, and ionic compounds, are preferred. Specific examples of the aforementioned polar compounds include unsaturated cyclic anhydrides and their aliphatic diesters, as well as diacid derivatives. In particular, compounds selected from maleic anhydride, C1-C10 linear and branched dialkyl maleates, C1-C10 linear and branched dialkyl fumarates, itaconic anhydride, C1-C10 linear and branched itaconic acid dialkyl esters, acrylic acid, maleic acid, fumaric acid, itaconic acid, and mixtures thereof may be used. Particularly preferred is a polar-modified polypropylene (PM-PP) homopolymer or copolymer, i.e., a polypropylene homopolymer or copolymer grafted with maleic anhydride or acrylic acid, used as the adhesion promoter (ab). Modified polymers, i.e., adhesion promoters (ab), can be produced by simple methods such as reaction extrusion of a polymer with maleic anhydride or acrylic acid in the presence of a free radical generator (such as an organic peroxide), as disclosed in, for example, U.S. Patent No. 4,506,056, U.S. Patent No. 4,753,997, or European Patent No. 1805238. The preferred amount of groups derived from polar compounds in polar-modified polypropylene (PM-PP) homopolymers or copolymers, i.e., adhesion promoters, is 0.5 to 5.0% by mass. For example, it may be in the range of 0.5% to 4.5% by mass, preferably 0.5% to 4.0% by mass, and more preferably 0.5% to 3.5% by mass. The preferred value for the melt flow rate MFR2 (230°C / 2.16kg) of polar-modified polypropylene (PM-PP) homopolymer or copolymer, i.e., the adhesion promoter, is 20.0 to 400 g / 10 min. The preferred value for the melt flow rate MFR2 (230°C / 2.16kg) of polar-modified polypropylene (PM-PP) homopolymer or copolymer is in the range of 40.0 to 300 g / 10 min, more preferably in the range of 50.0 to 250 g / 10 min. In one embodiment of the present invention, the adhesion promoter (ab) is a homopolymer or copolymer of maleic anhydride-modified polypropylene and / or a homopolymer or copolymer of acrylic acid-modified polypropylene. Preferably, the adhesion promoter is a maleic anhydride-modified polypropylene homopolymer and / or an acrylic acid-modified polypropylene homopolymer, preferably a maleic anhydride-modified polypropylene homopolymer. For example, suitable polarity-modified polypropylene (PM-PP) homopolymers or copolymers include, for example, polypropylene homopolymers grafted with maleic anhydride (PP-g-MAH) and polypropylene homopolymers grafted with acrylic acid (PP-g-AA). The adhesion promoter is preferably present in an amount of 1 to 5% by mass, more preferably 1 to 4% by mass, and most preferably 1 to 3% by mass, relative to the total amount of the polypropylene composition of the present invention.

[0020] Halogen-free flame retardants containing nitrogen and phosphorus (HFFR) (b) The polypropylene composition of the present invention contains 20 to 30% by mass of (b) a halogen-free flame retardant containing nitrogen and phosphorus, based on the total amount (100% by mass) of the polypropylene composition. In preferred embodiments, the polypropylene composition contains 20 to 28% by mass, preferably 21 to 26% by mass, of the halogen-free flame retardant containing nitrogen and phosphorus. With these amounts of the halogen-free flame retardant containing nitrogen and phosphorus, a V0 rating of the polypropylene composition can be easily achieved. Flame retardant (b) is halogen-free. In other words, flame retardant (b) preferably contains no organic or inorganic compounds containing halogen atoms. The term "halogen" as used herein refers to the elements of Group 17 of the periodic table. Furthermore, flame retardant (b) is an N,P-based halogen-free flame retardant. This means that it is a halogen-free flame retardant that preferably contains at least one nitrogen-containing moiety and at least one phosphorus-containing moiety. The at least one nitrogen-containing moiety is preferably selected from the group consisting of ammonium, piperazine, melamine, diamine, amide, derivatives thereof and combinations thereof. The at least one phosphorus-containing moiety is preferably selected from the group consisting of phosphates, e.g., orthophosphate; diphosphate; polyphosphate or pyrophosphate, phosphoric acid, polyphosphate, phosphinic acid, phosphorus pentoxide, derivatives thereof and combinations thereof. It is even more preferable that the flame retardant (b) is an expansive flame retardant. In one embodiment, the halogen-free flame retardant (b) may include at least one nitrogen-containing phosphate, preferably at least one organic nitrogen-containing phosphate. Preferably, the organic nitrogen-containing phosphate is a heterocyclic C3-C6, more preferably C3-C4 alkyl or aryl compound phosphate containing at least one N atom. In one embodiment, the halogen-free flame retardant (b) comprises ammonium polyphosphate or ammonium polyphosphate. Suitable halogen-free flame retardants (b) are commercially available, for example, Budensheim (Brookfield) Budit 699S, and Presafer 100A, 100C, and 100D. Other suitable halogen-free flame retardants (b) include ADK STAB FP-2100JC, ADK STAB FP-2500S, and ADK STAB FP-2600U from ADEKA, and PNA 220 from JLS Chemicals. Most commercially available products have a nitrogen content ranging from 18% to 35% by mass, and a phosphorus content ranging from 16% to 25% by mass. In certain embodiments of the present disclosure, the halogen-free flame retardant (b) comprises a first nitrogen-containing phosphate (P1) and a second nitrogen-containing phosphate (P2) different from the first nitrogen-containing phosphate (P1). In this particular embodiment, the first nitrogen-containing phosphate (P1) and the second nitrogen-containing phosphate (P2) may be organic nitrogen-containing phosphates. It is particularly preferable that the first nitrogen-containing phosphate (P1) and the second nitrogen-containing phosphate (P2) are heterocyclic C3-C6-more preferably C3-C4-alkyl or aryl compound phosphates containing at least one N atom. The first nitrogen-containing phosphate (P1) is preferably an organic nitrogen-containing polyphosphate. More preferably, the first nitrogen-containing phosphate (P1) is a heterocyclic C3-C6-more preferably C3-C4-alkyl or aryl compound phosphate containing at least one N atom. It is particularly preferred that the first nitrogen-containing phosphate (P1) is a melamine polyphosphate. The second nitrogen-containing phosphate (P2) is preferably an organic nitrogen-containing diphosphate. More preferably, the second nitrogen-containing phosphate (P2) is a diphosphate of a heterocyclic C3-C6-more preferably C3-C4-alkyl compound containing at least one N atom, for example, two N atoms. It is particularly preferable that the second nitrogen-containing phosphate (P2) is piperazine pyrophosphate. According to a preferred embodiment of the present invention, the mass ratio of the first nitrogen-containing phosphate (P1) to the second nitrogen-containing phosphate (P2) is in the range of 70:30 to 30:70. A very suitable example of a commercially available halogen-free flame retardant (b) according to the specific embodiment described above is the flame retardant product sold by SULI under the trade name Phlamoon®-1090A. The amount of halogen-free flame retardant (b) refers to the amount of halogen-free flame retardant (b) provided by the manufacturer based on the total mass of the polypropylene composition. Therefore, halogen-free flame retardant (b) may contain small amounts of further components such as additives, flame retardant synergies, and / or carrier media. It should be understood that such further components are calculated relative to the amount of halogen-free flame retardant (b). In one embodiment, the halogen-free flame retardant (b) contains 35-40% by mass of melamine polyphosphate and 50-60% by mass of piperazine pyrophosphate based on the total amount (100% by mass) of the halogen-free flame retardant (b).

[0021] Pigment (c) The polypropylene composition of the present invention contains (c) 0.2 to 2.0% by mass of pigment based on the total amount (100% by mass) of the polypropylene composition. Preferably, the polypropylene composition contains (c) 0.3 to 1.5% by mass, particularly 0.4 to 1.3% by mass of pigment based on the total amount (100% by mass) of the polypropylene composition. To provide the pigment content defined above, the pigment is preferably incorporated into the polypropylene composition as a pigment masterbatch. The pigment masterbatch preferably comprises the pigment and at least one pigment carrier polymer. In one embodiment, the pigment carrier polymer may be a homopolymer or copolymer of propylene. The pigment may be an organic pigment and / or carbon black. If the pigment is an organic pigment, phthalocyanine pigments are preferred. For example, if the pigment is an organic pigment, it may be selected from phthalocyanine green pigment, phthalocyanine blue pigment, and combinations thereof. It is assumed that improving UV performance using acid scavengers is even more pronounced when the polypropylene composition contains organic pigments. Organic pigments are particularly sensitive to acids, and the addition of calcium stearate helps to reduce acidity, preventing the pigments from fading.

[0022] Additives (d) The polypropylene composition of the present invention contains (d) 0.2 to 5.0% by mass of additives based on the total amount (100% by mass) of the polypropylene composition. In some embodiments, the polypropylene composition of the present disclosure contains (d) 0.25 to 2.50% by mass of additives, preferably 0.5 to 2.0% by mass of additives, based on the total amount (100% by mass) of the polypropylene composition. Within the scope of the terms of the present invention, additives are all compounds other than adhesion promoters, pigments and / or pigment carrier polymers, included in a content of 5% by mass or less based on the total amount (100% by mass) of the polypropylene composition.

[0023] Ester-HALS(d1) The polypropylene composition of this disclosure contains (d1) 0.1 to 1.0% by mass of HALS (ester-HALS) having at least one ester group, based on the total amount (100% by mass) of the polypropylene composition. The hindered amine light stabilizer (d1) is present in an amount of 0.1 to 1.0% by mass, for example, 0.2 to 1.0% by mass, for example, 0.3 to 0.8% by mass, or 0.4 to 0.7% by mass, based on the total amount (100% by mass) of the polypropylene composition. Hindered amine light stabilizers (HALS) have at least one ester group (HALS). In one embodiment, the HALS having an ester group is given by the following formula (I):

[0024] [ka] (In the formula, x is 1 to 4, and n is 1 to 10, preferably x is 1 or 2 and n is 4 to 10) There is. In one embodiment, HALS has at least two ester groups. More preferably, HALS(d1) contains at least one 2,2,6,6-substituted piperidine moiety or at least one 2,2-substituted piperazine moiety. In one embodiment, HALS contains at least two 2,2,6,6-substituted piperidine moieties. Preferably, HALS contains more than two 2,2,6,6-substituted piperidine moieties. In one embodiment, HALS(d1) is a polymer hindered amine compound. As used herein, “polymer hindered amine compound” means that the hindered amine compound has more than two piperidine moieties, each containing a repeating unit with substituents at least at the 2,2,6,6 positions. Preferably, the mass-average molecular weight Mw of HALS(d1) is at least 400 g / mol. Particularly preferred HALS(d1) has a mass-average molecular weight Mw of 2,000 g / mol or more, for example, 2,000 to 7,000 g / mol, for example, 2,000 to 5,000 g / mol, or 2,500 to 4,500 g / mol. HALS(d1) having at least one ester group according to this disclosure are commercially available, for example, from BASF, Sigma-Aldrich, Ciba, and Cytec.

[0025] In one embodiment, HALS(d1) comprises at least one HALS having an ester group selected from a combination thereof, comprising a dimethyl 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer succinate having a mass-average molecular weight Mw of 2,000 to 7,000 g / mol, a 2,2,6,6-tetramethylpiperidine-4-yl alkanoate having a chain length of 11 to 18 carbon atoms, and a halogen polymer. More preferably, HALS(d1) is dimethyl 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer succinate (CAS: 65447-77-0) having a mass-average molecular weight Mw of 2,000 to 7,000 g / mol, or a mixture of at least two different 2,2,6,6-tetramethylpiperidine-4-yl alkanoates having a chain length of 11 to 18 carbon atoms (CAS: 86403-32-9 / 167078-06-0).

[0026] Acid scavenger (d2) The polypropylene composition of the present invention contains at least one acid scavenger in an amount of (d2) 0.1 to 1.0% by mass based on the total amount (100% by mass) of the polypropylene composition. Preferred acid scavengers (d2) include hydrotalcite, zinc oxide, and C11-C20 alkyl carboxylates, such as stearate. In one embodiment, the acid scavenger (d2) comprises at least one stearate selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, barium stearate, and zinc stearate. In a particular embodiment, the acid scavenger (d2) is calcium stearate (CAS: 1592-23-0).

[0027] UV absorber containing a phenolic hydroxyl group (d3) The polypropylene composition of the present invention may optionally contain at least one UV absorber containing a (d3) phenolic hydroxyl group in an amount of 0.1 to 0.8% by mass relative to the total amount (100% by mass) of the polypropylene composition. Preferably, the polypropylene composition contains at least one UV absorber containing a phenolic hydroxyl group in an amount of 0.2 to 0.7% by mass relative to the total amount (100% by mass) of the polypropylene composition. In certain embodiments, at least one UV absorber (d3) containing a phenolic hydroxyl group is selected from 2-hydroxy-4-n-octoxybenzophenone (CAS: 1843-05-6), 2-(4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-(octyloxy)-phenol (CAS: 2725-22-6), and hexadecyl-3,5-bis-tert-butyl-4-hydroxybenzoate (CAS: 67845-93-6).

[0028] Antioxidant (d4) The polypropylene composition of the present invention may optionally contain (d4) at least one antioxidant in an amount of 0.1 to 0.5% by mass relative to the total amount (100% by mass) of the polypropylene composition. In one embodiment, the antioxidant (d4) is a di(C8-C30)alkylamine compound, which may have further substituents, for example, a long-chain N,N-dialkylhydroxylamine compound of formula R1R2NOH(I), where R1 and R2 are independently selected from alkyl groups of 8 to 30 carbon atoms. In one embodiment, the antioxidant (d4) is a di((C10-C25)alkyl)hydroxylamine compound, preferably a di((C15-C22)alkyl)hydroxylamine compound. A preferred example of the antioxidant (d4) of the present invention is bis(octadecyl)hydroxylamine (CAS: 143925-92-2). In a more preferred embodiment, at least one antioxidant (d4) is selected from the group consisting of phenolic antioxidants and phosphorus-containing antioxidants. In particular, at least one antioxidant (d4) may be selected from octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (CAS:2082-79-3), 2,6-di-tert-butyl-4-methylphenol (CAS:128-37-0), pentaerythrityl-tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate) (CAS:6683-19-8), bis(2,4-di-tert-butylphenyl)-pentaerythrityl-di-phosphite (CAS:26741-53-7), and tris(2,4-di-t-butylphenyl)phosphite (CAS:31570-04-4). Among these, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (CAS:2082-79-3) and tris(2,4-di-t-butylphenyl)phosphite (CAS:31570-04-4) are particularly preferred antioxidants (d4). The antioxidant (d4) of the present invention is commercially available, for example, from BASF and Sigma-Aldrich.

[0029] Metal deactivator (d5) The polypropylene composition of the present invention may optionally contain (d5) at least one of at least one metal deactivators in an amount of 0.1 to 0.5% by mass relative to the total amount (100% by mass) of the polypropylene composition. The metal deactivator may be an organometallic deactivator. The metal deactivator preferably exerts its effect by deactivating metal ions that may be introduced into the polypropylene composition by talc and / or other additives. Therefore, in its broadest sense, an organometallic deactivator is a complexing agent that can deactivate or reduce the function of metal ions, such as iron or copper ions, in order to initiate or catalyze the decomposition of an additive portion of a polymer or polymer composition (IUPAC, 1996). Accordingly, an organometallic deactivator preferably contains at least one, preferably two, -C(O)-NH- groups. Examples of organometallic deactivators include 2,2'-oxamide-bis-(ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate) (CAS:70331-94-1)N,N'-bis-(3(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionyl)hydrazine (CAS:32687-78-8), oxalyl-bis-(benzylidene hydrazide) (CAS:6629-10-3), and 2,5-bis These are -(2-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionylamide)ethyl-amino)-benzoquinone, tris-(2-tert-butyl-4-thio-(2'-methyl-4'-hydroxy-5'-tert-butyl)phenyl-5-methyl)-phenylphosphite (CAS: 36339-47-6), and decamethylene-dicarboxy-di-salityroyl-hydrazide (CAS: 63245-38-5). Particularly preferred organometallic deactivators are N,N'-bis-(3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionyl)hydrazine (CAS: 32687-78-8) and / or 2,2'-oxamide-bis-(ethyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (CAS: 70331-94-1). In certain embodiments, the metal deactivator (d5) is 2,2'-oxamide-bis-(ethyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate) (CAS:70331-94-1).

[0030] Nucleating agent (d6) The polypropylene composition of this disclosure may further contain 0.1 to 1.2% by mass, preferably 0.25 to 1.0% by mass, of the total amount (100% by mass) of the polypropylene composition (d6). In preferred embodiments, the nucleating agent may be an inorganic nucleating agent, such as a mineral nucleating agent. For example, the nucleating agent may contain or consist of an IUPAC Group 2 metal compound such as calcium carbonate or talc. The term "talc" as used in this invention refers to a talc with a high magnesium silicate content (for example, more than approximately 90% by mass of MgO). + This refers to a wide range of natural minerals (equivalent to SiO2). Most commercially available talc grades are considered suitable for use in this invention, but those with small particle size and a uniform particle size distribution are preferred.

[0031] Goods This disclosure further provides articles comprising the polypropylene composition of this disclosure. In particular, the present disclosure relates to articles comprising at least 60% by mass, more preferably at least 80% by mass, even more preferably at least 90% by mass, for example, at least 95% by mass or at least 99% by mass of the polypropylene composition of the present disclosure. In particularly preferred embodiments, the present invention relates to articles comprising the polypropylene composition of the present disclosure. The articles are preferably automotive articles, such as automotive articles in the field of electronic components, such as electrical cable insulators, housings for electrical devices, and containers and components for power electronics parts of automobiles and household electrical appliances. In one embodiment, the articles of the Disclosure form or constitute a part of a battery housing or a housing for an electrical device, or form or constitute a part of an electrical cable insulator, container, or a power electronics component of a part of an automobile or household appliance.

[0032] use This disclosure also relates to the combined use of (i) ester-containing HALS (ester-HALS) and (ii) an acid scavenger for improving the UV stability of polypropylene compositions containing halogen-free flame retardants containing nitrogen and phosphorus. In one embodiment, the above compound combination is used in a polypropylene composition further comprising an organic pigment, such as a phthalocyanine pigment. When the combination of ester-HALS and an acid scavenger is used for UV stabilization of a glass fiber-reinforced polypropylene composition, i.e., a polypropylene composition further comprising glass fibers and an adhesion promoter, a significant improvement is shown. Similarly, when the combination of ester-HALS and an acid scavenger is used for UV stabilization of a polypropylene composition further comprising at least one UV absorber containing a phenolic hydroxyl group, a good effect is observed.

[0033] In one embodiment, ester-HALS(i) is selected from a mixture of dimethyl succinate 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer (CAS: 65447-77-0) having a molecular weight Mw of 2,000 to 7,000 g / mol and 2,2,6,6-tetramethylpiperidin-4-yl alkanoate (CAS: 86403-32-9 / 167078-06-0) having a chain length of 11 to 18 carbon atoms. In one embodiment, the acid scavenger (ii) is selected from hydrotalcite, zinc oxide, and C11-C20 alkyl carboxylates, such as stearate. In another embodiment, the acid scavenger (ii) comprises at least one stearate selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, barium stearate, and zinc stearate. In yet another embodiment, the acid scavenger (ii) is calcium stearate (CAS: 1592-23-0). In one embodiment, (i) dimethyl succinate 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer (CAS: 65447-77-0) having a molecular weight Mw of 2,000 to 7,000 g / mol is used in combination with (ii) calcium stearate (CAS: 1592-23-0). In another embodiment, (i) a mixture of 2,2,6,6-tetramethylpiperidin-4-yl alkanoate having a chain length of 11 to 18 carbon atoms (CAS: 86403-32-9 / 167078-06-0) and (ii) calcium stearate (CAS: 1592-23-0) are used in combination. [Examples]

[0034] 908 kg / m 3 Density (measured according to ISO 1183), melt flow rate at 100 g / 10 min (230°C, 2.16 kg) (measured according to ISO 1133), flexural modulus of elasticity at 1500 MPa (2 mm / min) (measured according to ISO 178), tensile strength at 28 MPa (50 mm / min) (measured according to ISO 527-2), heat distortion temperature at 95°C (0.45 MPa) (measured according to ISO 75-2), 4 kJ / m 2 The notched Charpy impact strength (23°C) (measured according to ISO 179 / 1eA) and 2 kJ / m² 2 A series of polypropylene compositions were prepared using a low-viscosity polypropylene compound (BJ400HP, Borealis AG) with a notched Charpy impact strength (-20°C) (measured according to ISO 179 / 1eA) as the base polymer. While the amount of ester-HALS (HALS1) was kept constant in all formulations, the calcium stearate concentration (examples vs. comparative examples of the present invention) and the type of UV absorber were varied as shown in Table 1 below. All formulations consist of 30% by mass of glass fiber (SGF, 13 μm cut E glass from Johns-Manville Thermoflow CS EC 13 636, cut length 4.0 mm), 22.5% by mass of an expandable flame retardant (Phlamoon® 1090A), 1.5% by mass of a fixative (maleic anhydride graft PP, SCONA TPPP 8112 GA), 0.1% by mass of E glass fiber (SGF, 13 μm cut E glass, 13 μm cut E glass from Johns Manville Thermoflow CS EC 13 636, cut length 636 mm) AO1, 0.1% by mass of AO2, 0.3% by mass of MD1, 3% by mass of a phthalocyanine-based green pigment masterbatch (manufactured by Audia Liqui Kolor), and the remainder being polypropylene compound BJ400HP until it reaches 100% by mass. As comparative examples, two further polypropylene compositions were prepared using HALS1 without calcium stearate. Comparative Example 4 is a black polypropylene composition without fillers of the BF970MO (Borealis AG) type. Comparative Example 5 is a glass fiber-filled polypropylene composition of the BJ400HP (Borealis AG) type. Both compositions contain 0.7% by mass of carbon black masterbatch CBMB-LD-09 (manufactured by Poly Plast Muller). The types and amounts of further components used in the preparation of the compositions are shown in Table 2.

[0035] Additives used in formulations Antioxidant

[0036] [ka] AO1 (Irganox® 1076) CAS: 2082-79-3, Mw 531 g / mol, Tm 50-55℃

[0037] [ka] AO2 (Irgafos(registered trademark) 168) CAS: 31570-04-4, Mw 647 g / mol, Tm 182-186℃. AO3 (Irganox® 1010), pentaerythrityl-tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate) (CAS: 6683-19-8) metal deactivator

[0038] [ka] MD1 (PALMAROLE MDA.P.10), CAS:32687-78-8, Mw 553g / mol, Tm 224~229℃.

[0039] HALS

[0040] [ka] HALS1 (Tinuivin® 622), CAS: 65447-77-0, Mw > 2.500 g / mol, Tm 55~70℃.

[0041] UV absorber

[0042] [ka] UVa1 (Chimassorb(R) 81) CAS:1843-05-6, Mw 326g / mol, Tm 47~49℃

[0043] [ka] UVa2 (Tinuvin® 1164) CAS: 2725-22-6, Mw 509 g / mol, Tm 88~91℃ Polymer additives PTFE: DYNEON TF 2025 Z PTFE Acid scavengers

[0044] [ka] CaSt CAS:1592-23-0, Mw 607g / mol, Tm 145-160℃.

[0045] Flame retardant

[0046] [ka] The obtained polypropylene compositions were subjected to UV weathering tests under wet (Florida) and dry (Kalahari) UV aging conditions. Color changes under each UV aging condition were measured. Furthermore, the flammability of the polypropylene compositions was tested according to the UL94 standard. The results of these tests are summarized in Table 1. In all cases, UV resistance was improved. Table 2 shows the UV aging performance of glass fiber-filled and unfilled black PP compositions containing an expandable flame retardant, regarding the change in color after UV aging conditions. The results support the hypothesis that the glass fiber-filled polypropylene composition has multiple micro-defects on its surface, resulting in higher water penetration into the material compared to the unfilled polypropylene composition (the dL* value is higher in Comparative Example 5 than in Comparative Example 4). Florida UV aging conditions (PV 3930): 60W / m 2 Irradiance (300-400 nm), black standard temperature 65±2°C, chamber temperature 38±3°C, relative humidity 70%, rain cycle ratio to UV cycle = 18 min / 102 min. PV 3930 is a test method developed by Volkswagen AG that describes an accelerated weathering test method using a xenon arc lamp as the irradiation source to characterize the aging behavior of plastics, elastomers, and foldable top cloths. This standard is based on the guidelines of ASTM G155 and ISO 4892-2. Kalahari UV aging conditions (PV 3929): 75W / m 2 Irradiance (300-400 nm), black standard temperature 90±2°C, chamber temperature 50±2°C, relative humidity 20%, no rainfall cycle. PV 3929 is a test method developed by Volkswagen AG that describes an accelerated weathering test method using a xenon arc lamp as the irradiation source to characterize the aging behavior of plastics, elastomers, and foldable top cloths. This standard is based on the ASTM G155 guidelines. Color changes Color changes are accessed using the CIELAB color space, designated by the International Commission on Illumination in 1994, by: DL*, the difference between lightness and darkness values, where a positive value represents a shift towards lighter colors and a negative value represents a shift towards darker colors; Da*, the difference on the red / green axis, where a positive value represents a shift towards redder colors and a negative value represents a shift towards greener colors; Db*, the difference on the yellow / blue axis, where a positive value represents a shift towards yellower colors and a negative value represents a shift towards bluer colors; and / or DE*, the total color difference value. Color measurements were performed using a DATACOLOR DC 500 colorimeter in accordance with DIN EN ISO 11664-4. UL94 The UL94 vertical combustion test was conducted in accordance with UL94:2016. Generally, UL 94:2016 requires that the formulation be injection molded into a sample measuring 125±5 mm in length, 13.0±0.5 mm in width, and 0.8–3.2 mm in thickness. Under Condition Part 1, the sample must be conditioned for 48 hours at a constant room temperature of 23±2°C and 50±10% humidity. Under Condition Part 2, before testing, the sample must be conditioned for 168 hours at 70±1°C in an air-circulating oven, and then cooled in a desiccator at room temperature for at least 4 hours. The test must be performed within 30 minutes of removing the sample from conditioning. The sample is suspended vertically in the test chamber, and the burning time after each ignition is recorded, including a first ignition for 10 seconds followed by a second ignition for another 10 seconds. The test also records whether there is afterglow igniting the cotton at the bottom of the chamber, combustion dripping, and a flame or glow up to the holding clamp. The classification is V-0, V-1, V-2, or unclassified. It is understood that the classification depends on the thickness of the sample. In the following, the UL94 vertical combustion test was performed only under the conditions described in Part 1 above, i.e., the sample was allowed to set in a constant room temperature of 23±2°C and a humidity of 50±10% for 48 hours. The sample was 1.5 mm thick.

[0047] [Table 1] Table 2

[0048] [Table 2]

Claims

1. A polypropylene composition, wherein the following amounts are relative to the total amount of the polypropylene composition: (a) 20 to 75% by mass of a polymer of propylene; (b) A halogen-free flame retardant containing 20 to 30% by mass of nitrogen and phosphorus; (c) 0.2 to 2.0% by mass of pigment; and (d) 0.2 to 5% by mass of additives The additive (d) is included in the following amounts relative to the total amount of the polypropylene composition: (d1) 0.1 to 1.0% by mass of at least one hindered amine light stabilizer (HALS) having at least one ester group, and (d2) 0.1 to 1.0% by mass of at least one acid scavenger A polypropylene composition containing the following:

2. (a) The polymer of propylene is a heterogeneous copolymer of propylene, or the following: (a1) Polypropylene matrix component, and The polypropylene composition according to claim 1, comprising (a2) a heterophase copolymer of propylene dispersed in the polypropylene matrix (a1), the propylene copolymer comprising (i) propylene and (ii) an elastic propylene copolymer component comprising units derived from ethylene and / or C4-C20 olefins.

3. (a) Melt flow rate MFR of propylene polymer ２ The polypropylene composition according to claim 1, wherein (230°C / 2.16 kg) is measured in accordance with ISO 1133 to be in the range of 10 to 200 g / 10 min or 60 to 200 g / 10 min.

4. Furthermore, the polypropylene composition according to any one of claims 1 to 3, comprising (aa) 10 to 50% by mass of glass fibers or glass short fibers having a nominal fiber diameter of 9 to 15 μm, based on the total amount of the polypropylene composition.

5. Furthermore, the polypropylene composition according to claim 4, comprising (a) 1 to 5% by mass of an adhesion promoter based on the total amount of the polypropylene composition, wherein the adhesion promoter is a homopolymer or copolymer of polypropylene grafted with maleic anhydride.

6. (b) A halogen-free flame retardant containing nitrogen and phosphorus comprises at least one nitrogen-containing portion and at least one phosphorus-containing portion, Here, the at least one nitrogen-containing portion is selected from the group consisting of ammonium, piperazine, melamine, diamine, amide, derivatives thereof and combinations thereof, and / or Here, the at least one phosphorus-containing portion is selected from the group consisting of phosphates, for example, orthophosphates; diphosphates; polyphosphates or pyrophosphates, phosphoric acid, polyphosphates, phosphinic acid, phosphorus pentoxide, derivatives thereof, and combinations thereof. The polypropylene composition according to any one of claims 1 to 5.

7. (b) The polypropylene composition according to any one of claims 1 to 6, wherein the halogen-free flame retardant containing nitrogen and phosphorus comprises 35 to 40% by mass of melamine polyphosphate and 50 to 60% by mass of piperazine pyrophosphate based on the total amount of the halogen-free flame retardant.

8. (c) The polypropylene composition according to any one of claims 1 to 7, wherein the pigment is an organic pigment and / or carbon black, and if it is an organic pigment, it is selected from phthalocyanine green pigment and phthalocyanine blue pigment.

9. (d1) HALS having at least one ester group are as follows: 【Chemistry 1】 (In the formula, x is between 1 and 4, and n is between 1 and 10, or (x is 1 or 2, and n is between 4 and 10) A polypropylene composition according to any one of claims 1 to 8, represented as shown.

10. (d1) The polypropylene composition according to any one of claims 1 to 9, wherein the HALS having at least one ester group is selected from a mixture of dimethyl 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer (CAS: 65447-77-0) having a mass-average molecular weight Mw of 2,000 to 7,000 g / mol and 2,2,6,6-tetramethylpiperidine-4-yl alkanoate (CAS: 86403-32-9 / 167078-06-0) having a chain length of 11 to 18 carbon atoms.

11. (d2) The polypropylene composition according to any one of claims 1 to 10, wherein the acid scavenger is calcium stearate (CAS: 1592-23-0).

12. Furthermore, the polypropylene composition according to any one of claims 1 to 11, comprising (d3) at least one UV absorber containing a phenolic hydroxyl group in an amount of 0.1 to 0.8% by mass relative to the total amount of the polypropylene composition, wherein the UV absorber is selected from 2-hydroxy-4-n-octoxybenzophenone (CAS: 1843-05-6), 2-(4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-(octyloxy)-phenol (CAS: 2725-22-6), and hexadecyl-3,5-bis-tert-butyl-4-hydroxybenzoate (CAS: 67845-93-6).

13. Furthermore, (d4) at least one antioxidant in an amount of 0.1 to 0.5% by mass relative to the total amount of the polypropylene composition, and (d5) at least one metal deactivator in an amount of 0.1 to 0.5% by mass relative to the total amount of the polypropylene composition, wherein (d4) the antioxidant is selected from octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (CAS: 2082-79-3) and tris(2,4-di-t-butylphenyl) phosphite (CAS: 31570-04-4), The polypropylene composition according to any one of claims 1 to 12, wherein the (d5) metal deactivator is 2,2'-oxamide-bis-(ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate) (CAS:70331-94-1).

14. An article comprising the polypropylene composition according to any one of claims 1 to 13, which forms or constitutes a part of a battery housing or a housing for an electrical device, or forms or constitutes a part of an electrical cable insulator, container, or a component of power electronics for an automobile or household electrical appliance.

15. (i) a combination of an ester group-containing HALS and (ii) an acid scavenger to improve the UV stability of a polypropylene composition containing a halogen-free flame retardant containing nitrogen and phosphorus.

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