Living hinge of alpha-nucleated propylene copolymer

Abstract

The living hinge consists of a polypropylene composition comprising a propylene copolymer having a comonomer content in the range of 2.0 to 6.5 mol-% and an alpha-nucleating agent as a main component.

Description

Technical Field

[0001] The present invention relates to a movable hinge composed of a polypropylene composition comprising at least 95.0% by weight of a propylene copolymer and 0.1 to 1.0% by weight of an α-nucleating agent; and an injection-molded article comprising two rigid members connected by at least one movable hinge. Background Technology

[0002] A movable hinge is a thin, flexible hinge that connects two relatively rigid components. Typically, it is made of the same material as the rigid component. Particularly preferred is that the movable hinge and the rigid component are a single piece, i.e., produced in a single process, typically by injection molding. Movable hinges can be used to engage the rigid components of containers, allowing them to bend along the hinge line. Polypropylene has a particularly good reputation as a movable hinge, its combination of stiffness and flexibility allowing for hundreds of cycles without breakage. Therefore, movable hinges are an indispensable part of modern packaging systems, such as in closures for sports drinks or cosmetics, and in long-life products such as home or hiking gear. For such packaging systems, a balance needs to be struck between hinge performance (especially flexibility) and stiffness, transparency, and soluble content. Therefore, there remains a need for next-generation materials with an improved performance balance. Summary of the Invention

[0003] The present invention provides a movable hinge composed of a polypropylene composition comprising a propylene copolymer (at least 95.0% by weight of the polypropylene composition) as a major component and 0.01 to 1.0% by weight of an α-nucleating agent, wherein the propylene copolymer is produced in the presence of a metallocene catalyst, and thus has a permeability in the range of >0.35 to 0.85 mol%. 13 The 2,1 erythroline region defect was measured by C NMR, and the comonomer of the propylene copolymer was a higher α-olefin, namely 1-butene, 1-hexene, or 1-octene.

[0004] Therefore, the present invention relates to a movable hinge composed of a polypropylene composition, the polypropylene composition comprising...

[0005] (a) Based on the total weight of the polypropylene composition, at least 95.0% by weight, preferably at least 97.0% by weight, of a propylene copolymer having a comonomer selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer, and

[0006] (b) Based on the total weight of the polypropylene composition, 0.01 to 1.0% by weight, preferably 0.05 to 0.5% by weight, of an α-nucleating agent.

[0007] The polypropylene composition further has

[0008] (ii) Passing within the range of 2.0 to 6.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0009] (iii) Passing within the range of >0.35 to 0.85 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0010] (iv) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min.

[0011] In some embodiments, the polypropylene composition has a molecular weight distribution (MWD) in the range of 2.2 to 3.5 as determined by gel permeation chromatography (GPC).

[0012] In some embodiments, the polypropylene composition is monophase and optionally has a xylene cold soluble (XCS) fraction determined at 25°C according to ISO 16152 in the range of 0.1 to 1.0% by weight.

[0013] In some embodiments, the polypropylene composition

[0014] (a) The highest melting peak temperature T, measured by DSC at a scan rate of 10 °C / min during the second heating step, is in the range of 140 to 152 °C. p,m ,as well as

[0015] (b) Conforms to Equation 1

[0016] (1)

[0017] in

[0018] “T p,m "T" represents the highest melting peak temperature T of the polypropylene composition measured by DSC at a scan rate of 10 °C / min during the second heating step. p,m , expressed in °C, and

[0019] “T p,c "T" represents the highest crystallization peak temperature T of the polypropylene composition, measured by DSC at a scan rate of 10 °C / min during the cooling step. p,c , expressed in °C.

[0020] In some embodiments, the propylene copolymer has

[0021] (a) Passing within the range of 2.0 to 6.5 mol%. 13 The content of comonomers measured by C-NMR, and

[0022] (b) Passing within the range of >0.35 to 0.85 mol%. 13 2,1 Erythrotype region defects measured by C NMR.

[0023] In some embodiments, the propylene copolymer includes

[0024] (a) First propylene copolymer fraction (F1), having a permeability in the range of 2.0 to 6.5 mol%. 13 The content of comonomers measured by C-NMR, and

[0025] (b) Second propylene copolymer fraction (F2),

[0026] in

[0027] - The comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are the same, but the amounts of comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are different;

[0028] - The weight ratio [(F1) / (F2)] between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 60 / 40 to 40 / 60, and

[0029] - Based on the propylene copolymer, the total amount of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) together is at least 98% by weight.

[0030] In some embodiments, the propylene copolymer is composed of a first propylene copolymer fraction (F1) and a second propylene copolymer fraction (F2).

[0031] In some embodiments, the propylene copolymer conforms to Equation 2

[0032] (2)

[0033] in

[0034] “C(PPC)” is the propylene copolymer through 13 The comonomer content measured by C NMR is expressed as mol%;

[0035] “C(F1)” is the first propylene copolymer fraction (F1) through 13The comonomer content measured by C NMR is expressed as mol%;

[0036] "(F1) / (PPC)" is the amount of the first propylene copolymer fraction (F1) in the propylene copolymer divided by the amount of the propylene copolymer, and optionally...

[0037] The difference in comonomer content between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 1.0 to 2.5 mol%.

[0038] In some embodiments, the polypropylene composition further includes one or more propylene homopolymers, wherein the total amount of the one or more propylene homopolymers is in the range of 0.5 to 3.0% by weight, based on the total amount of the polypropylene composition.

[0039] In some embodiments, the one or more propylene homopolymers have a melt flow rate MFR2 in the range of 1.0 to 25.0 g / 10 min, measured according to ISO 1133 at 230 °C and a load of 2.16 kg, and optionally have a maximum melting peak temperature T measured by DSC at a scan rate of 10 °C / min during the second heating step, in the range of 162 to 169 °C. p,m .

[0040] In some embodiments, the α-nucleating agent is selected from the group consisting of polymer nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or phenyltriamide-based nucleating agents.

[0041] In some embodiments, the movable hinge is obtained by injection molding the polypropylene composition, and the movable hinge has a thickness in the range of 0.05 to 0.50 mm.

[0042] The present invention also relates to an injection-molded article, preferably a thin-walled injection-molded article having a wall thickness of at most 2.00 mm, comprising two rigid members connected by at least one movable hinge, wherein...

[0043] The injection-molded article comprises a polypropylene composition as defined in any of the foregoing embodiments, and

[0044] Injection-molded products are made into individual parts.

[0045] The present invention also relates to an injection-molded article as defined in the preceding paragraph, wherein two rigid members are connected by at least one movable hinge, and preferably the injection-molded article is a storage box.

[0046] The present invention also relates to an injection-molded article comprising two rigid members connected by at least one movable hinge, wherein the injection-molded article is composed of a polypropylene composition as defined in any of the foregoing embodiments, and

[0047] Injection-molded products are made into individual parts.

[0048] Furthermore,

[0049] The injection-molded product is a hinged cover, with one rigid component being the cover and the other rigid component being the mount (or support frame or bracket).

[0050] Finally, the present invention relates to the use of a polypropylene composition as defined in any of the foregoing embodiments for manufacturing a movable hinge or an injection-molded article comprising at least one movable hinge, wherein preferably, the injection-molded article is a thin-walled injection-molded article having a wall thickness of up to 2.00 mm, preferably having a wall thickness in the range of 0.05 to 2.00 mm. Preferably, the movable hinge is an injection-molded movable hinge, i.e., obtained by injection molding a polypropylene composition as defined in any of the foregoing embodiments. Preferably, the polypropylene composition as defined in any of the foregoing embodiments is used to manufacture an injection-molded article comprising at least one movable hinge, wherein the injection-molded article is a single piece. Attached Figure Description

[0051] Figure 1 shows the external dimensions of 160.9 × 130.0 × 69.1 mm produced by injection molding. 3 It is a lunchbox with two movable hinges. Detailed Implementation

[0052] The invention is defined in more detail below.

[0053] movable hinges / injection molded products

[0054] Those skilled in the art will understand that the movable hinge according to the invention is typically a thin, flexible hinge that connects two relatively rigid components. The movable hinge according to the invention is preferably manufactured by injection molding. More preferably, the thickness of the movable hinge is much thinner than the rigid components typically connected by the movable hinge. Therefore, the movable hinge has a thickness preferably in the range of 0.05 to 0.50 mm, more preferably in the range of 0.08 to 0.40 mm, such as in the range of 0.10 to 0.35 mm.

[0055] Furthermore, the movable hinge according to the invention comprises a polypropylene composition as defined in more detail below. That is, the movable hinge is made of a polypropylene composition as defined in more detail below. In a preferred embodiment, the movable hinge is made of the polypropylene composition as defined in more detail below by injection molding, more preferably by thin-wall injection molding. Injection molding and thin-wall injection molding techniques in the field of polypropylene are known to those skilled in the art. For example, refer to NelloPasquini's "Polypropylene Handbook," 2nd edition (pages 422-442).

[0056] More preferably, the present invention relates to an injection-molded article comprising two rigid members connected by at least one movable hinge, wherein

[0057] Injection-molded articles are composed of polypropylene compositions as defined in more detail below, and

[0058] Injection-molded products are made into individual parts.

[0059] In other words, an injection-molded article (in which two rigid parts are connected by at least one movable hinge) is made in one process from a polypropylene composition as defined in more detail below, i.e., as a single piece.

[0060] Preferably, the injection molding process is a thin-wall injection molding process, so the wall thickness of the injection-molded article is less than 2.00 mm, preferably in the range of 0.7 to 1.7 mm, and more preferably in the range of 0.9 to 1.6 mm. Therefore, it is preferred that the two rigid members have a wall thickness in the range of 0.60 to 2.00 mm, more preferably in the range of 0.7 to 1.7 mm, and still more preferably in the range of 0.9 to 1.6 mm, and at least one movable hinge has a wall thickness in the range of 0.05 to 0.50 mm.

[0061] Preferably, the injection-molded article made of a polypropylene composition as defined in more detail below, and more preferably a thin-walled injection-molded article, comprises two compartments connected by at least one movable hinge. A particular example of such an injection-molded article is a storage box.

[0062] In another preferred embodiment, the injection-molded article includes two rigid members connected by at least one movable hinge, wherein

[0063] Injection-molded articles are composed of polypropylene compositions as defined in more detail below, and

[0064] Injection-molded products are made into individual parts.

[0065] The injection-molded product is a hinged cover, with one rigid component being the cover and the other rigid component being the mounting bracket.

[0066] In another, still preferred embodiment, the present invention relates to the use of a polypropylene composition as defined below for manufacturing injection-molded articles comprising a movable hinge or including at least one movable hinge, wherein preferably, the injection-molded article is a thin-walled injection-molded article having a wall thickness of up to 2.00 mm, preferably in the range of 0.7 to 1.7 mm, more preferably in the range of 0.9 to 1.6 mm. Preferred embodiments of the invention manufactured using a polypropylene composition are defined above.

[0067] Polypropylene composition

[0068] The movable hinge and the injection-molded article including the movable hinge are made of a polypropylene composition as defined below. First, the individual components of the polypropylene composition are described, followed by the polypropylene composition itself.

[0069] propylene copolymer

[0070] The majority of the polypropylene composition is a propylene copolymer, that is, at least 95.0% by weight, more preferably at least 97.0% by weight, of the polypropylene composition is a propylene copolymer.

[0071] The comonomers of the propylene copolymer are selected from the group consisting of 1-butene, 1-hexene, and 1-octene. More preferably, the propylene copolymer is a 1-butene-propylene copolymer. Preferably, the propylene copolymer has a content in the range of 2.0 to 6.5 mol%, preferably in the range of 3.0 to 5.5 mol%. 13 The comonomer content is measured by C-NMR. Therefore, it is particularly preferred that the propylene copolymer is a 1-butene-propylene copolymer having a content in the range of 2.0 to 6.5 mol%, preferably in the range of 3.0 to 5.5 mol%. 13 1-Butene content measured by C-NMR.

[0072] Furthermore, the propylene copolymers according to the invention must be produced using a metallocene catalyst, which is reflected by the presence of 2,1-erythroid defects in the polymer chain. More information regarding polymerization conditions will be provided in detail below. Therefore, it is preferred that the propylene copolymers according to the invention have a polymerization rate in the range of >0.35 to 0.85 mol%, more preferably in the range of 0.4 to 0.75 mol%. 13 2,1 Erythrotype region defects measured by C NMR.

[0073] Due to the use of metallocene catalysts in their production, another characteristic of propylene copolymers is their relatively low amount of xylene cold-soluble matter. Therefore, it is preferred that the propylene copolymers have a xylene cold-soluble matter (XCS) fraction determined according to ISO 16152 at 25°C in the range of 0.1 to 1.0 wt%, more preferably in the range of 0.2 to 0.6 wt%. The low soluble matter content also indicates that the propylene copolymer is not a multiphase system but a monophase system. In other words, the propylene copolymer does not include polymer components that are immiscible with each other, as this is the case with multiphase propylene copolymers. In contrast to monophase systems, multiphase systems comprise a continuous polymer phase, such as polypropylene, in which additional immiscible polymers (such as elastomeric polymers) are dispersed as inclusions. Conversely, a polypropylene system containing a polypropylene matrix and inclusions as a second polymer phase is referred to as multiphase and is not part of this invention. The presence of the second polymer phase, or so-called inclusions, can be observed, for example, by high-resolution microscopy (such as electron microscopy or atomic force microscopy) or by dynamic mechanical thermal analysis (DMTA). In particular, in DMTA, the presence of multiphase structures can be identified by the presence of at least two different glass transition temperatures.

[0074] Further preferably, the propylene copolymer has a molecular weight distribution (MWD) determined by gel permeation chromatography (GPC) in the range of a ratio between weight-average molecular weight (Mw) and number-average molecular weight (Mn), which is defined as 2.0 to 5.0, more preferably 2.1 to 4.5, and still more preferably 2.2 to 3.5.

[0075] Additionally, the molecular weight of the propylene copolymer must be low enough to allow for the production of movable hinges and injection-molded articles, preferably thin-walled injection-molded articles. Therefore, it is preferred that the propylene copolymer has a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133, in the range of 15 to 100 g / 10 min, more preferably in the range of 16 to 90 g / 10 min, and still more preferably in the range of 17 to 80 g / 10 min.

[0076] In a preferred embodiment, the propylene copolymer comprises two propylene copolymer fractions. That is, the propylene copolymer includes...

[0077] (a) The first propylene copolymer fraction (F1), which has the characteristics of passing through 13 C-NMR measurements showed that the concentrations were in the range of 2.0 to 6.5 mol%, preferably in the range of 2.5 to 5.0 mol%. 13 The content of comonomers measured by C-NMR, and

[0078] (b) Second propylene copolymer fraction (F2),

[0079] in

[0080] - The comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are the same, but the amounts of comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are different;

[0081] - The weight ratio [(F1) / (F2)] between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 60 / 40 to 40 / 60, and

[0082] - Based on the propylene copolymer, the total amount of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) together is at least 98% by weight, preferably the propylene copolymer is composed of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2).

[0083] More preferably, the propylene copolymer conforms to Equation 2, and even more preferably, it conforms to Equation 2a.

[0084] (2)

[0085] (2a)

[0086] in

[0087] “C(PPC)” is the propylene copolymer. 13 Comonomer content [mol%] as measured by C NMR;

[0088] “C(F1)” is the first propylene copolymer fraction (F1) through which… 13 Comonomer content [mol%] as measured by C NMR;

[0089] “(F1) / (PPC)” is the amount of the first propylene copolymer fraction (F1) in the propylene copolymer divided by the amount of propylene copolymer.

[0090] Therefore, it is further preferred that the difference in comonomer content between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 1.0 to 2.5 mol%.

[0091] As mentioned above, the propylene copolymers according to the present invention must be produced using metallocene catalysts.

[0092] Preferably, propylene copolymers are produced in a sequential polymerization process using a specific metallocene catalyst. Therefore, the propylene copolymers must be produced using a metallocene catalyst as disclosed in WO 2019 / 179959, which is incorporated herein by reference.

[0093] The metallocene catalyst complex used to manufacture propylene copolymers is specifically defined by formula (I):

[0094]

[0095] In the complex of formula (I), preferably Zr if Mt is Zr or Hf, and each X is a σ ligand. Most preferably, each X is independently a hydrogen atom, a halogen atom, a C1-C6 alkoxy group, or an R' group, wherein R' is a C1-C6 alkyl, phenyl, or benzyl group. Most preferably, X is a chlorine, benzyl, or methyl group. Preferably, the two X groups are identical. The most preferred option is two chlorine groups, two methyl groups, or two benzyl groups, especially two chlorine groups. For further preferred definitions of residues, refer to WO2019 / 179959.

[0096] In particular, the preferred metallocene catalyst complex is:

[0097] Racemic-trans-dimethylsilyl[2-methyl-4,8-bis-(4'-tert-butylphenyl)-1,5,6,7-tetrahydro-s-indarsen-1-yl][2-methyl-4-(3',5'-dimethylphenyl)-5-methoxy-6-tert-butylindene-1-yl]zirconium dichloride (MC-1);

[0098] Racemic-trans-dimethylsilyl[2-methyl-4,8-bis-(3',5'-dimethylphenyl)-1,5,6,7-tetrahydro-s-indarsen-1-yl][2-methyl-4-(3',5'-dimethylphenyl)-5-methoxy-6-tert-butylindene-1-yl]zirconium dichloride (MC-2);

[0099] Racemic-trans-dimethylsilyl[2-methyl-4,8-bis-(3',5'-dimethylphenyl)-1,5,6,7-tetrahydro-s-indarsen-1-yl][2-methyl-4-(3',5'-di-tert-butylphenyl)-5-methoxy-6-tert-butylindene-1-yl]zirconium dichloride (MC-3).

[0100] Dimethylzirconium analogs corresponding to the three catalysts defined above are also possible, but not preferred. The most preferred catalyst is MC-2, which is used in the embodiments of the present invention.

[0101] co-catalyst

[0102] To form an active catalytic material, a cocatalyst well-known in the art is typically required. Here, cocatalyst systems including boron-containing cocatalysts and aluminoxane cocatalysts are used in combination with metallocene catalyst complexes as defined above.

[0103] Typical aluminum oxane cocatalysts are in the prior art. A preferred aluminum oxane is methylaluminoxane (MAO). Since the aluminum oxanes used as cocatalysts according to the present invention are prepared by means of their chemical composition rather than as pure compounds, the molar concentrations of the aluminum oxane solutions mentioned below are based on their aluminum content.

[0104] As mentioned above, aluminum oxane cocatalysts are used in combination with boron-containing cocatalysts.

[0105] Boron-based cocatalysts of interest include those of formula (Z).

[0106] BY3 (Z)

[0107] Wherein Y is the same or different and is a hydrogen atom; an alkyl group having 1 to about 20 carbon atoms; an aryl group having 6 to about 15 carbon atoms; an alkylaryl, aralkyl, haloalkyl, or haloaryl group, each group having 1 to 10 carbon atoms in the alkyl group and 6 to 20 carbon atoms in the aryl group; or fluorine, chlorine, bromine, or iodine. Preferred examples of Y are methyl, propyl, isopropyl, isobutyl, or trifluoromethyl, unsaturated groups (such as aryl or haloaryl groups (e.g., phenyl, tolyl, benzyl, p-fluorophenyl, 3,5-difluorophenyl, pentachlorophenyl, pentafluorophenyl, 3,4,5-trifluorophenyl, and 3,5-di(trifluoromethyl)phenyl)). Preferred options are trifluoroborane, triphenylborane, tri(4-fluorophenyl)borane, tri(3,5-difluorophenyl)borane, tri(4-fluoromethylphenyl)borane, tri(2,4,6-trifluorophenyl)borane, tri(pentafluorophenyl)borane, tri(tolyl)borane, tri(3,5-dimethyl-phenyl)borane, tri(3,5-difluorophenyl)borane, and / or tri(3,4,5-trifluorophenyl)borane. Tri(pentafluorophenyl)borane is particularly preferred.

[0108] Preferred ionic compounds that may be used include: triethylammonium tetra(phenyl)borate, tributylammonium tetra(phenyl)borate, trimethylammonium tetra(tolyl)borate, tributylammonium tetra(tolyl)borate, tributylammonium tetra(pentafluorophenyl)borate, tripropylammonium tetra(dimethylphenyl)borate, tributylammonium tetra(trifluoromethylphenyl)borate, tributylammonium tetra(4-fluorophenyl)borate, N,N-dimethylcyclohexylammonium tetra(pentafluorophenyl)borate, N,N-dimethylbenzylammonium tetra(pentafluorophenyl)borate, N,N-dimethylphenylammonium tetra(phenyl)borate, N,N-diethylphenylammonium tetra(phenyl)borate, N,N-dimethylphenylammonium tetra(pentafluorophenyl)borate, and tetra(pentafluorophenyl)borate. N,N-di(propyl)ammonium, di(cyclohexyl)ammonium tetra(pentafluorophenyl)borate, triphenylphosphonium tetra(phenyl)borate, triethylphosphonium tetra(phenyl)borate, diphenylphosphonium tetra(phenyl)borate, tri(methylphenyl)phosphonium tetra(phenyl)borate, tri(dimethylphenyl)phosphonium tetra(phenyl)borate, triphenylcarbenium tetrakis(pentafluorophenyl)borate, or ferrocenium tetrakis(pentafluorophenyl)borate.

[0109] Preferred are triphenylcarbazide tetra(pentafluorophenyl)borate, N,N-dimethylcyclohexylammonium tetra(pentafluorophenyl)borate, or N,N-dimethylbenzylammonium tetra(pentafluorophenyl)borate. Certain boron cocatalysts are particularly preferred. Preferred borates include triphenylmethyl ions. Therefore, N,N-dimethylammonium tetra(pentafluorophenyl)borate and Ph3CB(PhF5)4 and their analogues are particularly preferred.

[0110] A combination of borate cocatalysts (such as triphenylmethyl tetra(pentafluorophenyl)borate) and methylaluminoxane (MAO) is particularly preferred.

[0111] The appropriate amount of co-catalyst is well known to technicians.

[0112] The molar ratio of boron to metallocene ions can be in the range of 0.5:1 to 10:1 mol / mol, preferably in the range of 1:1 to 10:1 mol / mol, and especially in the range of 1:1 to 5:1 mol / mol.

[0113] The molar ratio of Al in the aluminoxane to the metal ions in the metallocene can be in the range of 1:1 to 2000:1 mol / mol, preferably in the range of 10:1 to 1000:1 mol / mol, and more preferably in the range of 50:1 to 500:1 mol / mol.

[0114] Catalyst manufacturing

[0115] Metallocene catalyst complexes can be combined with suitable co-catalysts as catalysts for propylene polymerization, for example in solvents (such as toluene or aliphatic hydrocarbons) (i.e., for polymerization in solution), as is well known in the art. Preferably, the polymerization of propylene occurs in a condensed phase or a gas phase.

[0116] The catalyst of this invention can be used in supported or unsupported form. The particulate support material used is preferably an organic or inorganic material, such as silica, alumina, or zirconium oxide, or a mixed oxide, such as silica-alumina, particularly silica, alumina, or silica-alumina. Silica support is preferred. Those skilled in the art know the procedures required for supporting metallocene catalysts.

[0117] Particularly preferred is that the support is a porous material so that the complex can be loaded into the pores of the support, for example using methods similar to those described in WO 94 / 14856, WO 95 / 12622 and WO 2006 / 097497. Particle size is not critical, but is preferably in the range of 5 to 200 μm, more preferably in the range of 20 to 80 μm. The use of these supports is conventional in the art.

[0118] Alternatively, no support is used at all. This catalyst can be prepared in solution, for example in an aromatic solvent such as toluene, by contacting a metallocene (as a solid or as a solution) with a co-catalyst (such as methylaluminoxane or borane or a borate pre-dissolved in an aromatic solvent), or by sequentially adding the dissolved catalyst components to a polymerization medium.

[0119] Furthermore, an external support can be omitted, but the catalyst still exists in the form of solid particles. Therefore, no external support material, such as an inert organic or inorganic support, such as silica as described above, is used.

[0120] To provide a catalyst in solid form without using an external support, a liquid / liquid emulsion system is preferred. The full disclosure of the necessary methods can be found in WO 03 / 051934, which is incorporated herein by reference.

[0121] The most preferred catalyst system is defined in the implementation scheme section below (single active site catalyst system 1 (SSCS1)).

[0122] The polymerization conditions in the sequential polymerization of propylene copolymers are not specific and are well known to those skilled in the art. Typically, the first propylene copolymer fraction (F1) is produced in a slurry reactor, while the second propylene copolymer fraction (F2) is produced in a gas-phase reactor in the presence of the first propylene copolymer fraction (F1). For such multi-stage processes, the preferred process is a "loop-gas phase" process, as described in patent documents such as EP 0 887 379, WO 92 / 12182, WO 2004 / 000899, WO 2004 / 111095, WO99 / 24478, WO 99 / 24479, WO 00 / 68315, WO 2015 / 082379, or WO 2015 / 011134.

[0123] As is well known, pre-aggregation can occur before the main aggregation.

[0124] Prepolymerization can be carried out in any type of continuously operating polymerization reactor. Prepolymerization can be carried out in slurry polymerization or gas-phase polymerization reactors, preferably in a loop prepolymerization reactor.

[0125] In a preferred embodiment, prepolymerization is carried out as bulk slurry polymerization in liquid propylene, i.e., the liquid phase mainly contains propylene, with small amounts of other reactants and optional inert components dissolved therein.

[0126] Prepolymerization is carried out in a continuously operating reactor with an average residence time of 5 to 90 minutes. Preferably, the average residence time is in the range of 10 to 60 minutes, more preferably in the range of 15 to 45 minutes.

[0127] The prepolymerization reaction is typically carried out at a temperature of 0 to 50°C, preferably 10 to 45°C, and more preferably 15 to 35°C.

[0128] The pressure in the prepolymerization reactor is not critical, but it must be high enough to keep the reaction mixture in the liquid phase, and is typically chosen such that the pressure is higher than or equal to the pressure in the subsequent polymerization. Therefore, the pressure can be from 20 to 100 bar, for example, from 30 to 70 bar.

[0129] If a prepolymerization step is performed, all the catalyst mixture is introduced into the prepolymerization step.

[0130] Precise control of prepolymerization conditions and reaction parameters is within the scope of the art.

[0131] As mentioned above, the first propylene copolymer fraction (F1) is preferably produced in a slurry-phase polymerization step, i.e., in the liquid phase.

[0132] The temperature during slurry polymerization is typically 50 to 110°C, preferably 60 to 100°C, and particularly 65 to 95°C. The pressure is 1 to 150 bar, preferably 10 to 100 bar.

[0133] Slurry polymerization can be carried out in any known reactor used for slurry polymerization. Such reactors include continuous stirred tank reactors and loop reactors. Loop reactors are generally known in the art and examples are given, for example, in US-A-4582816, US-A-3405109, US-A-3324093, EP-A-479186, and US-A-5391654.

[0134] Residence time can vary within the reactor regions defined above. In one embodiment, residence time in a slurry reactor (e.g., a loop reactor) is in the range of 0.5 to 5 hours, such as 0.5 to 2 hours, while residence time in a gas-phase reactor is typically in the range of 1 to 8 hours, such as 1.5 to 4 hours.

[0135] As is known in the art, other components can also be introduced into the slurry polymerization stage. Therefore, hydrogen is added to control the molecular weight of the polymer.

[0136] The slurry polymerization stage is followed by a gas-phase polymerization stage, in which a second propylene copolymer fraction (F2) is produced. Preferably, the slurry is directly introduced into the gas-phase polymerization zone without a flash evaporation step between stages. This direct feed is described in EP-A-887379, EP-A-887380, EP-A-887381 and EP-A-991684.

[0137] That is, the reaction product of slurry-phase polymerization (i.e., the first propylene copolymer fraction (F1)) preferably carried out in a loop reactor is then transferred to a subsequent gas-phase reactor, in which a second propylene copolymer fraction (F2) is produced.

[0138] Gas-phase polymerization can be carried out in a fluidized bed reactor, a fast fluidized bed reactor, a clarified bed reactor, or any combination of these reactors. When a combination of reactors is used, the polymer is then transferred from one polymerization reactor to another. However, it is preferred that the second propylene copolymer fraction (F2) is produced in a gas-phase reactor.

[0139] Typically, the gas-phase reactor operates at a temperature in the range of 50 to 100°C, preferably in the range of 65 to 95°C. The pressure is suitably 10 to 40 bar, preferably 15 to 30 bar.

[0140] According to the present invention, a first propylene copolymer fraction (F1) is produced in a first step, i.e., in a first reactor (e.g., a loop reactor), while a second propylene copolymer fraction (F2) is produced in a subsequent step, i.e., in a second reactor (e.g., a gas-phase reactor). If the polymerization method of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) also includes a prepolymerization step, then, according to the present invention, the first propylene copolymer fraction (F1) is the polymer produced in the prepolymerization and the polymer produced in the subsequent first step (in the first reactor (e.g., a loop reactor)), while the second propylene copolymer fraction (F2) is the product of the second reactor (e.g., a gas-phase reactor). The amount of polymer produced in the prepolymerization step is relatively small compared to the amount produced in the first reactor, and therefore has no significant impact on the properties of the polypropylene from the first reactor.

[0141] The preferred properties of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) have been mentioned above.

[0142] α-nucleating agent

[0143] Another important component of the polypropylene composition is an α-nucleating agent, which is present in the range of 0.01 to 1.0% by weight, more preferably in the range of 0.03 to 0.8% by weight, and even more preferably in the range of 0.05 to 0.5% by weight, based on the total weight of the composition.

[0144] Preferred examples of α-nucleating agents are disclosed in the 6th edition of Hans Zweifel's "Plastics Additives Handbook", pages 967-990.

[0145] Among all α-nucleating agents, bis[2,4,8,10-tetrakis(1,1-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxa-phoshocin-6-oxidato] (also known as bis[2,4,8,10-tetrakis(1,1-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxa-phoshocin-6-oxidato) nucleating agents (such as ADK NA-21, NA-21 E, NA-21 F, etc.), sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate (ADK) NA-11), bis[2,2'-methylene-bis(4,6-di-tert-butylphenyl)-phosphate]hydroxyaluminum, sorbitol nucleating agents (i.e., di(alkylbenzyl)sorbitol, such as 1,3:2,4-25-dibenzyl sorbitol, 1,3:2,4-di(4-methylbenzyl)sorbitol, 1,3:2,4-di(4-ethylbenzyl)sorbitol and 1,3:2,4-bis(3,4-dimethylbenzyl)sorbitol), and nonitol derivatives (such as 1,2,3-trideoxy-4,6;5,7-bis-O-[(4-propylphenyl)methylene]nonitol), and phenyltriamides (such as... 1,3,5-benzenetriamides, such as N,N',N”-tritert-butyl-1,3,5-benzenetricarboxamide, N,N',N”-tricyclohexyl-1,3,5-benzenetricarboxamide and N-[3,5-bis-(2,2-dimethyl-propionylamino)-phenyl]-2,2-dimethyl-propionamide), wherein 1,3:2,4-bis(4-methylbenzylene)sorbitol and N-[3,5-bis-(2,2-dimethyl-propionylamino)-phenyl]-2,2-dimethyl-propionamide, and polymer nucleating agents selected from the group consisting of vinylcycloalkane polymers and vinylalkane polymers are particularly preferred.

[0146] Preferably, the polypropylene composition contains at least one α-nucleating agent selected from the group consisting of polymer nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and phenyltriamamide-based nucleating agents. More preferably, the α-nucleating agent is selected from the group consisting of 1,2,3-trideoxy-4,6;5,7-bis-O-[(4-propylphenyl)methylene]nonitol, bis-(3,4-dimethylbenzylene)-sorbitol (DMDBS), and polyvinylcyclohexane (p-VCH). Even more preferably, the α-nucleating agent present in the polypropylene composition is selected from the group consisting of 1,2,3-trideoxy-4,6;5,7-bis-O-[(4-propylphenyl)methylene]nonitol, bis-(3,4-dimethylbenzylene)-sorbitol (DMDBS), and polyvinylcyclohexane (p-VCH).

[0147] Therefore, it is particularly preferred that the α-nucleating agent present in the polypropylene composition is selected from the group consisting of polyvinylcyclohexane (p-VCH), 1,2,3-trideoxy-4,6;5,7-bis-O-[(4-propylphenyl)methylene]nonitol and bis-(3,4-dimethylbenzyl)-sorbitol (DMDBS), wherein further, based on the total amount of the polypropylene composition, the total amount of the α-nucleating agent is in the range of 0.05 to 0.5% by weight.

[0148] Other components

[0149] As described above, the polypropylene composition must include a propylene copolymer and an α-nucleating agent, with the propylene copolymer as the major component. Additionally, the polypropylene composition may include typical additives other than the α-nucleating agent, such as antioxidants, antistatic agents, and antifogging agents, as well as other polypropylenes different from the propylene copolymer.

[0150] Typically, based on polypropylene compositions, the total amount of additives other than α-nucleating agents should not exceed 1.0% by weight, preferably in the range of 0.05 to 1.0% by weight.

[0151] α-nucleating agents and additives can be added to polypropylene compositions along with small amounts of polyolefins that are different from propylene copolymers. In this context, the term "different from" means that the polyolefin differs from the propylene copolymer in at least one typical characterizing feature in the polymer field, such as molecular weight, for example in melt flow rate MFR2 (230°C; 2.16 kg), melting point, and / or misalignment, for example in 2,1 erythroide region defects, and the absence of the comonomers required for the propylene copolymer. Therefore, the polyolefin used for this purpose is preferably a propylene homopolymer rather than a propylene copolymer. Thus, this polypropylene, more preferably this propylene homopolymer, has a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min. Even more preferably, this polypropylene, and still more preferably, this propylene homopolymer, has been produced using a fourth or fifth generation Ziegler-Natta catalyst (see Nello Pasquini's "Polypropylene Handbook," 2nd edition, pp. 17 / 18), and therefore has a maximum melting peak temperature T measured by DSC (scan rate 10 °C / min; second heating step) in the range of 162 to 169 °C. p,m Another typical characteristic of this polypropylene, and more preferably this propylene homopolymer, produced using a fourth- or fifth-generation Ziegler-Natta catalyst, is that it does not exhibit 2,1-erythian zone defects, i.e., no detectable 2,1-erythian zone defects when analyzed according to the invention. Therefore, it is preferred that the polypropylene composition comprises one or more propylene homopolymers having a melt flow rate MFR2 (230°C; 2.16 kg) as measured according to ISO 1133, preferably in the range of 1.0 to 25.0 g / 10 min. More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) as measured according to ISO 1133, in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m Even more preferably, one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 132,1-erythroxene region defects as measured by C NMR. The total amount of polyolefin, as defined in this paragraph, is in the range of 0.5 to 4.0% by weight, based on the amount of the polypropylene composition. Therefore, it is particularly preferred that the polyolefin is one or more propylene homopolymers, wherein the total amount of said one or more propylene homopolymers is further in the range of 0.5 to 4.0% by weight, based on the amount of the polypropylene composition.

[0152] Therefore, the polypropylene composition according to the present invention comprises, and preferably consists of, the following components:

[0153] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0154] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent.

[0155] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0156] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 13 2,1 Erythrotype region defects measured by C NMR.

[0157] Properties of Polypropylene Compositions

[0158] As mentioned above, the main component of the polypropylene composition is the propylene copolymer. Therefore, the specific characteristics of the propylene copolymer can also be identified in the final polypropylene composition. Or in other words, the important characteristics of the polypropylene composition are the same as or at least very similar to those of the propylene copolymer. In particular, the following properties can be mentioned: the amount of comonomer, the type of comonomer, 2,1-erythroid defects, molecular weight distribution, and melt flow rate.

[0159] Therefore, the polypropylene composition has a permeability in the range of 2.0 to 6.5 mol%, preferably in the range of 3.0 to 5.5 mol%. 13 The comonomer content is measured by C-NMR. The comonomer of the polypropylene composition is selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably 1-butene. For the avoidance of doubt, the main monomer of the polypropylene composition is propylene, and the comonomer can only be selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably 1-butene. Therefore, in a very preferred embodiment, the sole comonomer of the polypropylene composition is 1-butene, which is obtained by… 13 The amount measured by C-NMR is from 2.0 to 6.5 mol%, preferably in the range of 3.0 to 5.5 mol%.

[0160] Furthermore, the polypropylene composition has a permeability in the range of >0.35 to 0.85 mol%, more preferably in the range of 3.0 to 5.5 mol%. 13 2,1-C NMR measurements of erythroximation defects, and melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, more preferably in the range of 15 to 80 g / 10 min.

[0161] Another advantage of the propylene copolymer of the present invention is its relatively low xylene cold soluble content. Therefore, the polypropylene composition has a xylene cold soluble (XCS) fraction determined according to ISO 16152 at 25°C in the range of 0.1 to 1.0% by weight, more preferably in the range of 0.2 to 0.6% by weight. The low soluble content also indicates that the polypropylene composition is not a multiphase system but a single-phase system, as if the propylene copolymer were the main polymer component in the polypropylene composition.

[0162] Further preferably, the polypropylene composition has a molecular weight distribution (MWD) determined by gel permeation chromatography (GPC) in the range of 2.0 to 5.0, more preferably in the range of 2.1 to 4.5, and still more preferably in the range of 2.2 to 3.5.

[0163] The polypropylene compositions according to the invention can be further defined by their melting and crystallization behavior. A particular characteristic of the polypropylene compositions according to the invention is the relatively small gap between the melting temperature and the crystallization temperature. To define the melting and crystallization temperatures, the highest melting peak temperature T, measured by DSC (scan rate 10 °C / min; second heating step), is always used. p,m and the highest crystallization peak temperature T measured by DSC (scan rate 10 °C / min; cooling step). p,c Therefore, it is particularly preferred that the polypropylene composition has the highest melting peak temperature T. p,m This is quite high for propylene copolymers produced by metallocene.

[0164] Therefore, the preferred polypropylene composition according to the present invention is...

[0165] (a) Having a highest melting peak temperature T measured by DSC (scan rate of 10 °C / min; second heating step) in the range of 140 to 152 °C. p,m ,as well as

[0166] (b) Conforms to Equation 1, preferably Equation 1a

[0167] (1)

[0168] (1a)

[0169] in

[0170] “T p,m "The highest melting peak temperature T was measured by DSC (scan rate of 10 °C / min; second heating step)." p,m [℃], and

[0171] “T p,c "The highest crystallization peak temperature T was measured by DSC (scan rate 10 °C / min; cooling step)." p,c [℃].

[0172] More preferably, the polypropylene composition according to the invention has

[0173] (a) The highest melting peak temperature T measured by DSC (scan rate of 10 °C / min; second heating step) in the range of 140 to 152 °C. p,m ,as well as

[0174] (b) The highest crystallization peak temperature T measured by DSC (scan rate of 10 °C / min; cooling step) in the range of 115 to 125 °C. p,c ,

[0175] Furthermore, the polypropylene composition conforms to Equation 1, preferably Equation 1a.

[0176] (1)

[0177] (1a)

[0178] in

[0179] “T p,m "The highest melting peak temperature T was measured by DSC (scan rate of 10 °C / min; second heating step)." p,m [℃], and

[0180] “T p,c "The highest crystallization peak temperature T was measured by DSC (scan rate 10 °C / min; cooling step)." p,c [℃].

[0181] Preferred implementation scheme

[0182] Some particularly preferred embodiments of the invention are set forth below.

[0183] A movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm, includes two rigid members connected by at least one movable hinge, wherein

[0184] Injection-molded products are made into individual parts.

[0185] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition, said polypropylene composition comprising...

[0186] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0187] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0188] Furthermore, the composition has

[0189] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%.13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0190] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0191] (iii) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, and more preferably in the range of 17 to 80 g / 10 min.

[0192] More preferably, the present invention relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm, includes two rigid members connected by at least one movable hinge, wherein

[0193] Injection-molded products are made into individual parts.

[0194] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0195] The polypropylene composition includes

[0196] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0197] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0198] Furthermore, the propylene copolymer has

[0199] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR, and the comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0200] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR

[0201] Furthermore, the composition has

[0202] (iii) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0203] (iv) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0204] (v) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, more preferably in the range of 17 to 80 g / 10 min.

[0205] More preferably, the present invention relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm, includes two rigid members connected by at least one movable hinge, wherein

[0206] Injection-molded products are made into individual parts.

[0207] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0208] The polypropylene composition comprises the following components:

[0209] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0210] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0211] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0212] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 13 2,1 erythroxene region defects measured by C NMR

[0213] Furthermore, the composition has

[0214] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0215] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0216] (iii) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, and more preferably in the range of 17 to 80 g / 10 min.

[0217] In another preferred embodiment, the present invention relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm and includes two rigid members connected by at least one movable hinge.

[0218] Injection-molded products are made into individual parts.

[0219] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0220] The polypropylene composition comprises the following components:

[0221] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0222] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent.

[0223] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0224] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 13 2,1 erythroxene region defects measured by C NMR

[0225] Furthermore, the propylene copolymer has

[0226] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR, and the comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0227] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR

[0228] Furthermore, the composition has

[0229] (iii) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0230] (iv) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0231] (v) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, more preferably in the range of 17 to 80 g / 10 min.

[0232] In another, still preferred, embodiment of the invention, the invention relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm and includes two rigid members connected by at least one movable hinge.

[0233] Injection-molded products are made into individual parts.

[0234] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0235] The polypropylene composition comprises the following components:

[0236] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0237] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0238] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0239] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 13 2,1 erythroxene region defects measured by C NMR

[0240] Furthermore, the composition has

[0241] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0242] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%.13 2,1 erythroxene region defects measured by C NMR, and

[0243] (iii) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, and more preferably in the range of 17 to 80 g / 10 min.

[0244] (iv) The highest melting peak temperature T measured by DSC (scan rate of 10 °C / min; second heating step) in the range of 140 to 152 °C. p,m ,as well as

[0245] Furthermore, the composition

[0246] (v) Conforms to Equation 1, preferably Equation 1a.

[0247] (1)

[0248] (1a)

[0249] in

[0250] “T p,m "The highest melting peak temperature T was measured by DSC (scan rate of 10 °C / min; second heating step)." p,m [℃], and

[0251] “T p,c "The highest crystallization peak temperature T was measured by DSC (scan rate 10 °C / min; cooling step)." p,c [℃].

[0252] In yet another, still preferred, embodiment of the invention, the invention relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm and includes two rigid members connected by at least one movable hinge.

[0253] Injection-molded products are made into individual parts.

[0254] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0255] The polypropylene composition comprises the following components:

[0256] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0257] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0258] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0259] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage 13 2,1 erythroxene region defects measured by C NMR

[0260] Furthermore, the propylene copolymer has

[0261] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR, and the comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0262] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR

[0263] Furthermore, the composition has

[0264] (iii) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 Comonomer content measured by C-NMR

[0265] (iv) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0266] (v) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, and more preferably in the range of 17 to 80 g / 10 min.

[0267] (vi) The highest melting peak temperature T measured by DSC (scan rate of 10 °C / min; second heating step) in the range of 140 to 152 °C. p,m ,as well as

[0268] Furthermore, the composition

[0269] (vii) Conforms to Equation 1, preferably Equation 1a.

[0270] (1)

[0271] (1a)

[0272] in

[0273] “T p,m "The highest melting peak temperature T was measured by DSC (scan rate of 10 °C / min; second heating step)." p,m [℃], and

[0274] “T p,c "The highest crystallization peak temperature T was measured by DSC (scan rate 10 °C / min; cooling step)." p,c [℃].

[0275] The present invention also relates to a movable hinge, preferably an injection-molded movable hinge, or an injection-molded article, preferably a thin-walled injection-molded article, wherein the thin-walled injection-molded article has a wall thickness of up to 2.00 mm, includes two rigid members connected by at least one movable hinge, wherein...

[0276] Injection-molded products are made into individual parts.

[0277] Furthermore, the movable hinge and the injection-molded article are composed of a polypropylene composition.

[0278] The polypropylene composition comprises the following components:

[0279] (a) Based on the total weight of the composition, at least 95.0% by weight, more preferably at least 97.0% by weight, of a propylene copolymer having comonomers selected from the group consisting of 1-butene, 1-hexene, and 1-octene, preferably the propylene copolymer being a 1-butene-propylene copolymer.

[0280] (b) Based on the total weight of the composition, 0.01 to 1.0% by weight, more preferably 0.05 to 0.5% by weight, of an α-nucleating agent, preferably selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or tricrimamide-based nucleating agents.

[0281] (c) Based on the total weight of the composition, 0.05 to 1.0% by weight of an additive, which is not an α-nucleating agent, and

[0282] (d) Optionally, based on the total weight of the composition, 0.5 to 4.0 wt% of one or more propylene homopolymers, preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, more preferably, wherein said one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m More preferably, the one or more propylene homopolymers have a melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 1.0 to 25.0 g / 10 min, and a maximum melting peak temperature T measured by DSC (scan rate of 10°C / min; second heating step) in the range of 162 to 169°C. p,m And no detectable passage13 2,1 erythroxene region defects measured by C NMR

[0283] Furthermore, the propylene copolymer has

[0284] (i) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The content of comonomers measured by C-NMR, and

[0285] (ii) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR

[0286] Furthermore, the composition has

[0287] (iii) Passing within the range of 2.0 to 6.5 mol%, preferably within the range of 3.0 to 5.5 mol%. 13 The comonomer content was measured by C-NMR. The comonomers were selected from the group consisting of 1-butene, 1-hexene, and 1-octene, with 1-butene being the preferred comonomer.

[0288] (iv) Passing within the range of >0.35 to 0.85 mol%, preferably within the range of 0.4 to 0.75 mol%. 13 2,1 erythroxene region defects measured by C NMR, and

[0289] (v) Melt flow rate MFR2 (230°C; 2.16 kg) measured according to ISO 1133 in the range of 15 to 100 g / 10 min, preferably in the range of 16 to 90 g / 10 min, and more preferably in the range of 17 to 80 g / 10 min.

[0290] (vi) Xylene cold solubles (XCS) fraction, determined at 25°C according to ISO 16152, in the range of 0.1 to 1.0 wt%, preferably in the range of 0.2 to 0.6 wt%.

[0291] (vii) Molecular weight distribution (MWD) determined by gel permeation chromatography (GPC) in the range of 2.0 to 5.0, more preferably in the range of 2.1 to 4.5, and still more preferably in the range of 2.2 to 3.5.

[0292] (viii) The highest melting peak temperature T measured by DSC (scan rate of 10 °C / min; second heating step) in the range of 140 to 152 °C. p,m ,as well as

[0293] Furthermore, the composition

[0294] (ix) conforms to equation 1, preferably equation 1a.

[0295] (1)

[0296] (1a)

[0297] in

[0298] “T p,m "The highest melting peak temperature T was measured by DSC (scan rate of 10 °C / min; second heating step)." p,m [℃], and

[0299] “T p,c "The highest crystallization peak temperature T was measured by DSC (scan rate 10 °C / min; cooling step)." p,c [℃].

[0300] The invention will be described below by way of example.

[0301] A. Measurement Method

[0302] Unless otherwise defined, the following definitions of terms and methods of measurement apply to the above general description of the invention, including the claims, and the following embodiments.

[0303] Quantitative analysis of microstructure using NMR spectroscopy

[0304] Quantitative nuclear magnetic resonance (NMR) spectroscopy is used to quantify the comonomer content of the polymer. (This is for...) 1 H and 13 A Bruker Avance III 500 NMR spectrometer, operating at 500.13 and 125.76 MHz respectively, recorded quantitative data in the molten state. 13 C{ 1 ¹H NMR spectroscopy. Nitrogen gas was used for all pneumatic devices at 180°C. 13 All spectra were recorded using a C-optimized 7 mm magic angle rotating (MAS) probe. Approximately 200 mg of material was loaded into a 7 mm outer diameter zirconia MAS rotor and rotated at 4 kHz. This setup was chosen primarily for the high sensitivity required for rapid identification and accurate quantification. Standard single-pulse excitation was employed, utilizing a NOE and RS-HEPT decoupling scheme with a short cyclic delay. A total of 1024 (1 k) transient signals were acquired for each spectrum using a 3 s cyclic delay.

[0305] Quantitative 13 C{ 1The ¹H NMR spectra were processed, integrated, and the quantitative properties were determined from the integration. All chemical shifts were internally referenced at 21.85 ppm for the methyl isotactic pentamematic group (mmmm).

[0306] Basic comonomer content method for spectroscopic analysis:

[0307] Characteristic signals corresponding to the incorporation of 1-butene were observed, and the content of comonomers was quantified as follows.

[0308] Using α at 43.6 ppm B2 The amount of 1-butene incorporated into isolated PPBPP sequences is quantified by integrating the sites and considering the number of reporter sites for each comonomer:

[0309] B = I α / 2

[0310] Using αα at 40.5 ppm B2B2 The amount of 1-butene incorporated into the PPBBPP bicontinuous sequence is quantified by integrating the sites and considering the number of reporter sites for each comonomer:

[0311] BB = 2 * I αα

[0312] When bicontinuous doping was observed, due to the signal α at 43.9 ppm... B2 and α B2B2 The overlap needs to be compensated for by the amount of 1-butene incorporated into the isolated PPBPP sequence:

[0313] B = (I α – 2 * I αα ) / 2

[0314] The total 1-butene content is calculated based on the sum of isolated and continuously incorporated 1-butene:

[0315] B 总 = B + BB

[0316] The amount of propylene was quantified based on the major Sαα-methylene site at 46.7 ppm and the relative amounts of αB2 and αB2B2-methylene units of propylene that were not considered (note that B and BB calculate the number of butene monomers per sequence, not the sequence number):

[0317] P 总 = I Sαα + B + BB / 2

[0318] The total mole fraction of 1-butene in the polymer is then calculated as follows:

[0319] f B = B 总 / (B 总 + P 总 )

[0320] The complete integral equation for the mole fraction of 1-butene in the polymer is:

[0321] f B = (((I α – 2 * I αα ) / 2) + (2 * I αα )) / (I Sαα + ((I α – 2 * I αα ) / 2) +((2 * I αα ) / 2)) + ((I α – 2 * I αα ) / 2) + (2 * I αα ))

[0322] This simplifies to:

[0323] f B = (I α / 2 + I αα ) / (I Sαα + I α + I αα )

[0324] The total amount of 1-butene incorporated, expressed as a mole percentage, is calculated from the mole fraction in the usual manner:

[0325] B [moles %] = 100 * f B

[0326] The total amount of 1-butene incorporated, expressed as a weight percentage, is calculated from mole fraction in a standard manner:

[0327] B [weight%] = 100 * (f B * 56.11) / ((f B * 56.11) + ((1 - f B ) * 42.08))

[0328] Details of these procedures can be found in Katja Klimke, Matthew Parkinson, Christian Piel, Walter Kaminsky, Hans Wolfgang Spiess, Manfred Wilhelm, Macromol. Chem. Phys. 2006, 207, 382; 2128;Patrice Castignolles, RobertGraf, Matthew Parkinson, Manfred Wilhelm, Marianne Gaborieau:, Polymer 2009,50, 2373;M. Pollard, K. Klimke, R. Graf, HW Spiess, M. Wilhelm, O.Sperber, C. Piel, W. Kaminsky, Macromolecules 2004, 37, 813;Xenia Filip, Carmen Tripon, Claudiu Found in Filip, J. Magn. Reson. 2005, 176, 239; John M. Griffin, Carmen Tripon, Ago Samoson, Claudiu Filip, Steven P. Brown, Mag. Res. inChem. 2007, 45(S1), S198 and J. Randall Rev. Macromol. Chem. Phys. 1989, C29, 201.

[0329] melt flow rate

[0330] Melt flow rate (MFR) is determined according to ISO 1133 and expressed in g / 10 min. MFR indicates the flowability of a polymer and therefore its processability. A higher melt flow rate generally corresponds to a lower polymer viscosity. The MFR2 for polypropylene was determined at 230°C and a load of 2.16 kg.

[0331] Calculate the melt flow rate MFR2 (230°C) of the second polypropylene (PP2):

[0332]

[0333] in

[0334] w(PP1) is the weight fraction of the first polypropylene (PP1) [in weight %].

[0335] w(PP2) is the weight fraction of the second polypropylene (PP2) [in weight %].

[0336] MFR(PP1) is the melt flow rate of the first polypropylene (PP1) MFR2 (230℃) [in g / 10min].

[0337] MFR(PP) is the melt flow rate of polypropylene (PP) reactor powder, MFR2 (230°C) [in g / 10min].

[0338] MFR(PP2) is the calculated melt flow rate of the second polypropylene (PP2) MFR2 (230°C) [in g / 10min].

[0339] molecular weight

[0340] The average molecular weight (Mz, Mw, and Mn) and molecular weight distribution (MWD) (i.e., Mw / Mn) were determined by gel permeation chromatography (GPC) according to ISO 16014-4:2003 and ASTM D 6474-99 using the following formulas:

[0341]

[0342]

[0343]

[0344] Where Ai and Mi are the chromatographic peak slice area and the molecular weight (MW) of the polyolefin.

[0345] The PolymerChar GPC instrument, equipped with an infrared (IR) detector, was used with 3 × Olexis and 1 × Olexis guard columns from Polymer Laboratories and 1,2,4-trichlorobenzene (TCB, stabilized with 250 mg / L of 2,6-di-tert-butyl-4-methylphenol) as solvent at 160 °C and a constant flow rate of 1 mL / min. 200 μL of sample solution was injected for each analysis. The column assembly was calibrated using universal calibration (according to ISO 16014-2:2003) using at least 15 narrow MWD polystyrene (PS) standards ranging from 0.5 kg / mol to 11500 kg / mol. The Mark Houwink constants for PS, PE, and PP used were as described according to ASTM D 6474-99. All samples were prepared by dissolving 5.0 to 9.0 mg of the polymer in 8 ml of stable TCB (same as the mobile phase) at 160 °C in the autosampler of the GPC instrument and gently agitating at 160 °C for 2.5 hours (for PP) or 3 hours (for PE).

[0346] Xylene soluble fraction at room temperature (XCS, wt%):

[0347] The amount of xylene-soluble polymers was determined at 25°C according to ISO 16152; 5th edition; 2005-07-01.

[0348] DSC analysis, melting peak temperature (T) p,m ) and heat of fusion (H f ), crystallization peak temperature (T) p,c ) and heat of crystallization (H c ): Samples of 5 to 7 mg were measured using a TAInstrument Q200 Differential Scanning Calorimeter (DSC). The DSC was operated according to ISO 11357 / Part 3 / Method C2 with heating / cooling / heating cycles at a scan rate of 10 °C / min over a temperature range of -30 to +225 °C. The highest crystallization peak temperature (T...) p,c ) and heat of crystallization (H c The temperature of the highest melting peak (T) is determined by the cooling step. p,m ) and heat of fusion (H f The result is determined by the second heating step.

[0349] Flexural modulus

[0350] The flexural modulus was determined according to ISO 178 Method A (3-point bending test) on an 80 × 10 × 4 mm specimen. According to this standard, a test speed of 2 mm / min and a span length of 16 times the thickness were used. The test temperature was 23 ± 2 °C. Injection molding was performed according to ISO 19069-2, using a melt temperature of 200 °C for all materials, regardless of the melt flow rate.

[0351] Haze

[0352] The haze is determined according to ASTM D1003-00, using a melt temperature of 230℃, and is injection molded according to EN ISO 1873-2 for 60 × 60 × 1 mm diameter pieces. 3 Measured on the plate.

[0353] Notched impact strength (NIS) of a simply supported beam

[0354] Notched impact strength (NIS) of simply supported beams is measured at +23°C using 80 × 10 × 4 mm injection-molded bar test specimens prepared in accordance with EN ISO 1873-2, according to ISO 179 1eA.

[0355] B. Preparation of polypropylene compositions

[0356] Catalyst used in embodiments of the present invention

[0357] Catalyst complex

[0358] The following metallocene complexes have been used as described in WO 2019 / 179959:

[0359]

[0360] Preparation of MAO-silica support

[0361] The steel reactor, equipped with a mechanical stirrer and filter, was flushed with nitrogen, and the reactor temperature was set to 20°C. Next, 5.0 kg of pre-calcined AGC Si-Tech grade DM-L-303 silica (calculated at 600°C) was added to the feed tank, followed by careful pressurization and depressurization with nitrogen using a manual valve. Then, 22 kg of toluene was added. The mixture was stirred for 15 min. Next, a 30% by weight solution (9.0 kg) of MAO from Lanxess in toluene was added through the feed line at the top of the reactor over 70 min. The reaction mixture was then heated to 90°C and stirred at 90°C for another two hours. The slurry was allowed to settle, and the mother liquor was filtered off. The catalyst was washed twice with toluene (22 kg) at 90°C, followed by settling and filtration. The reactor was cooled to 60°C, and the solids were washed with heptane (22.2 kg). Finally, the MAO-treated SiO2 was dried at 60°C under a nitrogen atmosphere for 2 hours, and then dried under vacuum (-0.5 bar, gauge pressure) with stirring for 5 hours. The MAO-treated support was collected as a free-flowing white powder, which was found to contain 12.2% Al by weight.

[0362] Preparation of Single Active Site Catalyst System 1 (SSCS1)

[0363] At 20°C, 30% by weight of MAO (0.7 kg) in toluene was added via burette into a nitrogen-covered steel reactor. Then, toluene (5.4 kg) was added with stirring. The metallocene complex (93 g) as described above was added from a metal cylinder, followed by rinsing with 1 kg of toluene. The mixture was stirred at 20°C for 60 minutes. Then, triphenylmethyl tetratetra(pentafluorophenyl)borate (91 g) was added from a metal cylinder, followed by rinsing with 1 kg of toluene. The mixture was stirred at room temperature for 1 hour. The resulting solution was added over 1 hour to a cake of MAO-silica supported material prepared as described above. The cake was left to stand for 12 hours, then dried at 60°C under a nitrogen stream for 2 hours, and further dried under vacuum (-0.5 bar, gauge pressure) with stirring for an additional 5 hours.

[0364] The dried catalyst was sampled as a pink, free-flowing powder containing 13.9% Al and 0.11% Zr.

[0365] Table 1: Aggregation Conditions

[0366]

[0367] Table 2: Polypropylene Compositions

[0368]

[0369] “FM” stands for flexural modulus;

[0370] “Poly2” refers to Borealis AG’s commercially available α-nucleated polypropylene homopolymer “HF955MO”.

[0371] "Poly3" refers to Borealis AG's commercially available polypropylene homopolymer "HF420FB".

[0372] “Poly4” refers to Borealis AG’s commercially available α-nucleating propylene-ethylene copolymer “BorePure RG466MO”.

[0373] "AO1" refers to BASF's sterically hindered pentaerythritol tetra(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate "Irganox 1010".

[0374] "AO2" refers to BASF's phosphorus-based antioxidant tris(2,4-di-tert-butylphenyl) phosphite "Irgafos168".

[0375] "CS" stands for calcium stearate.

[0376] “AN1” is Milliken’s commercially available α-nucleating agent Millad 3988, which contains bis-(3,4-dimethylbenzyl)-sorbitol (DMDBS).

[0377] C. Preparation of lunch boxes

[0378] The external dimensions, as shown in Figure 1, are 160.9 × 130.0 × 69.1 mm, produced by injection molding, with rounded corners and edges. 3 A lunchbox. According to Figure 1, the lunchbox consists of a lower half with a height of 35.3 mm and an upper half with a height of 33.8 mm, connected to a first movable hinge at position A', and equipped with a closure including a second movable hinge at position A. The lunchbox has a wall thickness of 1.54 mm, and the first and second movable hinges have a thickness of 0.30 mm. The mold is equipped with a single-point gate, and the box is produced in the open position, allowing testing of the first movable hinge connecting the two halves in an undeformed state. Production was carried out using an Engel ES 1350 / 350 HL injection molding machine, with a melt temperature of 260°C, a molding temperature of 25°C, and a 119 cm⁻¹ diameter. 3 The filling rate was set at approximately 1 second. This allowed for a filling time of about 1 second, followed by a holding time of 5 seconds, a holding pressure of 493 bar, and a cooling time of 12 seconds before ejection. Prior to testing, the lunchboxes were stored at 23°C in the open position for at least 96 hours.

[0379] Top load test

[0380] To conduct this test, five lunchboxes of each material were closed and secured with closures. Each box was subjected to a compression test according to DIN 55526-1991 at a speed of 10 mm / min, with a maximum deformation of 20 mm. The maximum compressive force and maximum deformation were recorded, and the average of the five results was calculated.

[0381] Hinge strength test

[0382] To conduct this test, specimens suitable for tensile testing were cut from the first movable hinge side of five lunchboxes of each material. The specimens were first cut with a band saw into 11 mm wide sections parallel to the A-A' cross-sectional plane in the central portion of the hinge, leaving 10 mm long, full-wall-thickness flat sections on both sides for clamping. To avoid edge interference, the specimens were then trimmed to a width of 10 mm by cutting and milling. The resulting specimens were subjected to normal tensile testing on a Zwick Z100-725333 machine according to ISO 527-1, using a strain rate of 1 mm / min, and tested until the specimen fractured. The stress and elongation or strain at fracture were recorded, and the average of five results was calculated.

[0383] Table 3: Lunchbox Performance

[0384]

[0385] Experience shows that the fracture stress and strain of a movable hinge in a tensile test are proportional to the long-term stability of the hinge (i.e., the number of times the hinge can bend without damage or breakage). Therefore, the data in Table 3 shows that the performance balance between top load and hinge stability is improved in the embodiments of the present invention compared to all comparative examples. As can be seen from the data in Table 2, this good performance is combined with low haze and extremely low xylene-soluble content.

Claims

1. A movable hinge, said movable hinge being composed of a polypropylene composition, said polypropylene composition comprising... (a) Based on the total weight of the polypropylene composition, at least 95.0% by weight of a propylene copolymer, said propylene copolymer having a comonomer selected from the group consisting of 1-butene, 1-hexene and 1-octene, and (b) Based on the total weight of the polypropylene composition, 0.01 to 1.0% by weight of an α-nucleating agent. The polypropylene composition further comprises (i) Passing within the range of 2.0 to 6.5 mol%. 13 The content of comonomers measured by C-NMR, wherein the comonomers are selected from the group consisting of 1-butene, 1-hexene, and 1-octene. (ii) Passing within the range of >0.35 to 0.85 mol%. 13 2,1 erythroxene region defects measured by C NMR, and (iii) Melt flow rate MFR2, measured according to ISO 1133 at 230°C and 2.16 kg load, in the range of 15 to 100 g / 10 min.

2. The movable hinge according to claim 1, wherein the propylene copolymer is a 1-butene-propylene copolymer.

3. The movable hinge according to claim 1 or 2, wherein the polypropylene composition has a molecular weight distribution (MWD) in the range of 2.2 to 3.5 as determined by gel permeation chromatography (GPC).

4. The movable hinge according to claim 1 or 2, wherein the polypropylene composition is monophase and optionally has a xylene cold soluble (XCS) fraction determined according to ISO 16152 at 25°C in the range of 0.1 to 1.0% by weight.

5. The movable hinge according to claim 1 or 2, wherein the polypropylene composition (a) The highest melting peak temperature T, measured by DSC at a scan rate of 10 °C / min during the second heating step, is in the range of 140 to 152 °C. p,m ,as well as (b) Conforms to Equation 1 （1） in T p,m "T" represents the highest melting peak temperature T of the polypropylene composition, measured by DSC at a scan rate of 10°C / min during the second heating step. p,m , expressed in °C, and T p,c "T" represents the highest crystallization peak temperature T of the polypropylene composition, measured by DSC at a scan rate of 10 °C / min during the cooling step. p,c , expressed in °C.

6. The movable hinge according to claim 1 or 2, wherein the propylene copolymer has (a) Passing within the range of 2.0 to 6.5 mol%. 13 The content of comonomers measured by C-NMR, and (b) Passing within the range of >0.35 to 0.85 mol%. 13 2,1 Erythrotype region defects measured by C NMR.

7. The movable hinge according to claim 1 or 2, wherein the propylene copolymer comprises (a) First propylene copolymer fraction (F1), having a permeability in the range of 2.0 to 6.5 mol%. 13 The content of comonomers measured by C-NMR, and (b) Second propylene copolymer fraction (F2), in - The comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are the same, but the amounts of comonomers in the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) are different; - The weight ratio [(F1) / (F2)] between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 60 / 40 to 40 / 60, and - Based on the propylene copolymer, the total amount of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) together is at least 98% by weight.

8. The movable hinge according to claim 7, wherein the propylene copolymer is composed of the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2).

9. The movable hinge according to claim 7, wherein the propylene copolymer conforms to Equation 2. （2） in "C(PPC)" represents the propylene copolymer through... 13 The comonomer content measured by C NMR is expressed as mol%; "C(F1)" refers to the first propylene copolymer fraction (F1) obtained through... 13 The comonomer content measured by C NMR is expressed as mol%; "(F1) / (PPC)" is the amount of the first propylene copolymer fraction (F1) in the propylene copolymer divided by the amount of the propylene copolymer, and optionally... The difference in comonomer content between the first propylene copolymer fraction (F1) and the second propylene copolymer fraction (F2) is in the range of 1.0 to 2.5 mol%.

10. The movable hinge according to claim 1 or 2, wherein the polypropylene composition further comprises one or more propylene homopolymers, wherein the total amount of the one or more propylene homopolymers is in the range of 0.5 to 3.0% by weight, based on the total amount of the polypropylene composition.

11. The movable hinge according to claim 10, wherein the one or more propylene homopolymers have a melt flow rate MFR2 measured according to ISO 1133 at 230°C and a load of 2.16 kg in the range of 1.0 to 25.0 g / 10 min, and optionally have a maximum melting peak temperature T measured by DSC at a scan rate of 10°C / min in the second heating step in the range of 162 to 169°C. p,m .

12. The movable hinge according to claim 1 or 2, wherein the α-nucleating agent is selected from the group consisting of polymeric nucleating agents, sorbitol-based nucleating agents, nonitol-based nucleating agents, and / or phenyltriamide-based nucleating agents.

13. The movable hinge according to claim 1 or 2, wherein the movable hinge is obtained by injection molding the polypropylene composition, and the movable hinge has a thickness in the range of 0.05 to 0.50 mm.

14. An injection-molded article comprising two rigid members connected by one or more movable hinges, wherein The injection-molded article is composed of a polypropylene composition as defined in any one of claims 1 to 12, and The injection-molded product is made into a single piece.

15. The injection-molded article of claim 14, wherein the one or more movable hinges have a wall thickness in the range of 0.05 to 0.50 mm.

16. The injection-molded article according to claim 14 or 15, wherein the thin-walled injection-molded article has a wall thickness in the range of 0.05 to 2.00 mm.

17. The injection-molded article according to claim 14 or 15, wherein the two rigid members are compartments connected by one or more movable hinges.

18. The injection-molded article according to claim 17, wherein the injection-molded article is a storage box.

19. The injection-molded article of claim 17, wherein the two compartments have a wall thickness in the range of 0.06 to 2.00 mm, and the one or more movable hinges have a wall thickness in the range of 0.05 to 0.50 mm.

20. The injection-molded article according to claim 14 or 15, wherein it is a hinged cover, wherein one rigid member is a cover and the other rigid member is a mounting bracket.

21. Use of the polypropylene composition as defined in any one of claims 1 to 13 for manufacturing a movable hinge or an injection-molded article comprising one or more movable hinges.

22. The use according to claim 21, wherein the injection-molded article is a thin-walled injection-molded article having a wall thickness in the range of 0.05 to 2.00 mm.

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