Polypropylene composition for HMS PP foamed sheet having well-balanced flexural resistance

Abstract

The present invention provides - 10 to 50% by weight of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP); - 40 to 89.95 wt. % high melt strength polypropylene (HMS-PP) having a F greater than 25.0 cN 30 Melt strength and v greater than 205mm / s 30 It has melt extensibility and F 30 Melt strength and v 30 High melt strength polypropylene (HMS-PP), the melt extensibility of which is determined in accordance with ISO 16790:2005; and - 0.05-10 wt.% of nucleating agent (NA); the present invention further relates to a polypropylene composition comprising the polypropylene copolymer of formula (I), a foamed sheet formed from the polypropylene composition; an article comprising the foamed sheet; and a method comprising forming the polypropylene composition. Furthermore, the present invention further relates to the use of the polypropylene composition for forming a foamed sheet.

Description

Technical Field

[0001] The present invention relates to a polypropylene composition suitable for a foamed sheet, a foamed sheet produced from the composition, and an article produced from the foamed sheet. The present invention further relates to a method for producing the polypropylene composition and use of the polypropylene composition.

Background Art

[0002] Currently, LDPE coated cartons and foamed PS are mainly used as materials for disposable single-use hot and cold beverage cups. Due to concerns about the health and harmful environmental effects of foamed PS cups, polystyrene cups are prohibited or are being prohibited in many countries and / or cities. Therefore, PE coated cartons are becoming increasingly popular and are replacing PS in hot and cold beverage cups. However, due to the LDPE coating, the paper cups are not compostable, and recycling is difficult because it is difficult and expensive to separate the pulp and the PE coating. Therefore, from the viewpoints of reusability and the environment, paper cups are not an ideal solution.

[0003] Therefore, the only practical way to dispose of paper cups is energy recovery by incineration or disposal of used cups at a landfill site. In addition to the environmental problems of paper cups, an unbalanced property profile, particularly the difference in bending resistance in the machine direction and transverse direction of the paper sheet used in the production of paper cups, is a problem. In addition to the above problems regarding paper cups, there is a problem of providing excellent heat insulation performance at high temperatures, particularly in the case of hot beverage cups.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, a recent development objective has been to develop a disposable, reusable material, particularly suitable for single-use hot and cold beverage cups, which overcomes the above-mentioned problems. [Means for solving the problem]

[0005] Thus, the present invention provides - 10.0 to 50.0% by weight of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP); - 40.0 to 89.95% by weight of high melt strength polypropylene (HMS-PP) having a F of greater than 25.0 cN 30 Melt Strength (F 30 melt strength) and v greater than 205 mm / s 30 Melt extensibility (v 30 melt extensibility) and F 30 Melt strength and v 30 High melt strength polypropylene (HMS-PP), whose melt extensibility is determined in accordance with ISO 16790:2005; and - 0.05-10.0 wt.% nucleating agent (NA); The present invention provides a polypropylene composition having

[0006] Surprisingly, the polypropylene composition of the present invention, when formed into a foam, has high flex resistance in both the machine and cross directions. Furthermore, unlike LDPE-coated cartons, the thermal conductivity does not increase with increasing temperature. Thus, the polypropylene composition of the present invention is particularly suitable for forming cups.

[0007] The linear polypropylene of the present invention does not contain side chains. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] High Melt Strength Polypropylene (HMS-PP) High melt strength polypropylene is branched and thus differs from linear polypropylene in that the polypropylene backbone contains side chains. On the other hand, unbranched polypropylene, i.e., linear polypropylene, does not contain side chains. The side chains greatly affect the rheology of polypropylene. Therefore, linear polypropylene and high melt strength polypropylene can be clearly distinguished by their flow behavior under stress.

[0009] In general, the formation of branches can be carried out by using a specific catalyst, i.e., a specific single-site catalyst, or by chemical modification. For the production of branched polypropylene obtained by using a specific catalyst, reference is made to EP1892264. For branched polypropylene obtained by chemical modification, reference is made to EP0879830A1. In such cases, the branched polypropylene is also called high melt strength polypropylene. The high melt strength polypropylene (HMS-PP) of the present invention is obtained by chemical modification of polypropylene (PP), as described in more detail below. HMS-PP is commercially available under the trade name Daploy from Borealis AG.

[0010] Therefore, high melt strength polypropylene (HMS-PP) has an F greater than 25.0 cN 30 melt strength and a v greater than 205 mm / s 30 melt extensibility, preferably an F greater than 25.0 cN and 50.0 cN or less 30 melt strength and a v greater than 205 mm / s and 300 mm / s or less 30 melt extensibility, so that the resulting polypropylene composition has good shear thinning properties. F 30 melt strength and v 30 The melt strength and v melt extensibility are measured in accordance with ISO 16790:2005.

[0011] In a preferred embodiment, the high melt strength polypropylene (HMS-PP) is (a) F that is greater than 25.0 cN and not more than 45.0 cN, preferably greater than 25.0 cN and not more than 42.0 cN, and most preferably greater than 25.0 cN and not more than 40.0 cN 30 Melt strength; and (b) v that is 210 - 300 mm / s, more preferably 215 - 290 mm / s, still more preferably 220 - 270 mm / s, and most preferably 225 - 260 mm / s 30 Melt extensibility; having.

[0012] In a particularly preferred embodiment, the high melt strength polypropylene (HMS-PP) has an F that is greater than 25.0 cN and not more than 45.0 cN 30 melt strength and a v of 210 - 300 mm / s 30 melt extensibility, for example, an F that is greater than 25.0 cN and not more than 42.0 cN 30 melt strength and a v of 215 - 290 mm / s 30 melt extensibility, or an F that is greater than 25.0 cN and not more than 40.0 cN 30 melt strength and a v of 220 - 270 mm / s 30 melt extensibility, or an F that is greater than 25.0 cN and not more than 40.0 cN 30 melt strength and a v of 225 - 260 mm / s 30 melt extensibility.

[0013] Furthermore, the high melt strength polypropylene (HMS-PP) preferably has a melt flow rate MFR2 (230 °C) that is not more than 15.0 g / 10 min, more preferably in the range of 0.5 - 15.0 g / 10 min, still more preferably in the range of 1.0 - 15.0 g / 10 min, for example in the range of 1.5 - 15.0 g / 10 min, as measured according to ISO 1133.

[0014] In a particularly preferred embodiment, the high melt strength polypropylene (HMS-PP) has a melt flow rate MFR2 (230 °C) of 7.0 g / 10 min or less, preferably in the range of 0.5 to 7.0 g / 10 min, more preferably in the range of 0.5 to 6.5 g / 10 min, still more preferably in the range of 0.5 to 6.0 g / 10 min, even more preferably in the range of 1.0 to 6.0 g / 10 min, for example in the range of 1.5 to 5.0 g / 10 min, as measured according to ISO 1133.

[0015] Thus, in one of the specific embodiments, the high melt strength polypropylene (HMS-PP) (a) has a melt flow rate MFR2 (230 °C) of 15.0 g / 10 min or less, more preferably in the range of 0.5 to 15.0 g / 10 min, still more preferably in the range of 1.0 to 15.0 g / 10 min, for example in the range of 1.5 to 15.0 g / 10 min; and (b) has an F melt strength greater than 25.0 cN, preferably greater than 25.0 cN and 50.0 cN or less, more preferably greater than 25.0 cN and 45.0 cN or less, still more preferably greater than 25.0 cN and 42.0 cN or less, most preferably greater than 25.0 cN and 40.0 cN or less 30 ; and (c) has a v melt extensibility greater than 205 mm / s, preferably greater than 205 mm / s and 300 mm / s or less, more preferably in the range of 210 to 300 mm / s, still more preferably in the range of 215 to 290 mm / s, even more preferably in the range of 220 to 270 mm / s, most preferably in the range of 225 to 260 mm / s 30 . .

[0016] In a particularly preferred embodiment, the high melt strength polypropylene (HMS-PP) (a) An MFR2 (230 °C) of 7.0 g / 10 min or less, preferably in the range of 0.5 to 7.0 g / 10 min, more preferably in the range of 0.5 to 6.5 g / 10 min, still more preferably in the range of 0.5 to 6.0 g / 10 min, even more preferably in the range of 1.0 to 6.0 g / 10 min, for example in the range of 1.5 to 5.0 g / 10 min; and, (b) An F greater than 25.0 cN, preferably greater than 25.0 cN and 50.0 cN or less, more preferably greater than 25.0 cN and 45.0 cN or less, still more preferably greater than 25.0 cN and 42.0 cN or less, most preferably greater than 25.0 cN and 40.0 cN or less 30 Melt strength; and, (c) A v greater than 205 mm / s, preferably greater than 205 mm / s and 300 mm / s or less, more preferably 210 to 300 mm / s, still more preferably 215 to 290 mm / s, even more preferably 220 to 270 mm / s, most preferably 225 to 260 mm / s 30 Melt extensibility; having.

[0017] Thus, in certain embodiments, high melt strength polypropylene (HMS-PP) has an MFR2 (230 °C) in the range of 0.5 to 15.0 g / 10 min, an F greater than 25.0 cN and 45.0 cN or less 30 Melt strength and a v of 210 to 300 mm / s 30 Melt extensibility, for example, an MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and 42.0 cN or less 30 Melt strength and a v of 215 to 290 mm / s 30 Melt extensibility, or an MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and 40.0 cN or less 30 Melt strength and a v of 220 to 270 mm / s 30Melt extensibility, or a melt flow rate MFR2 (230 °C) in the range of 1.5 to 15.0 g / 10 min, an F greater than 25.0 cN and not more than 40.0 cN 30 Melt strength and a v of 225 to 260 mm / s 30 Has melt extensibility.

[0018] Therefore, in another specific embodiment, the high melt strength polypropylene (HMS-PP) has a melt flow rate MFR2 (230 °C) in the range of 0.5 to 7.0 g / 10 min, an F greater than 25.0 cN and not more than 45.0 cN 30 Melt strength and a v of 210 to 300 mm / s 30 Melt extensibility, for example, a melt flow rate MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and not more than 42.0 cN 30 Melt strength and a v of 215 to 290 mm / s 30 Melt extensibility, or a melt flow rate MFR2 (230 °C) in the range of 1.0 to 6.0 g / 10 min, an F greater than 25.0 cN and not more than 40.0 cN 30 Melt strength and a v of 220 to 270 mm / s 30 Melt extensibility, or a melt flow rate MFR2 (230 °C) in the range of 1.5 to 5.0 g / 10 min, an F greater than 25.0 cN and not more than 40.0 cN 30 Melt strength and a v of 225 to 260 mm / s 30 Has melt extensibility.

[0019] Preferably, the high melt strength polypropylene (HMS-PP) has a melting point of at least 130 °C, more preferably at least 135 °C, and most preferably at least 140 °C. Its crystallization temperature is preferably at least 110 °C, more preferably at least 120 °C.

[0020] Furthermore, the high melt strength polypropylene (HMS-PP) can be a high melt strength random propylene copolymer (R-HMS-PP) or a high melt strength propylene homopolymer (H-HMS-PP), with the latter being preferred.

[0021] For the purposes of the present invention, the expression "propylene homopolymer" means a polypropylene consisting essentially of propylene units, i.e., a polypropylene consisting of at least 97 mol.%, preferably at least 98 mol.%, more preferably at least 99 mol.%, and most preferably at least 99.8 mol.% of propylene units. In a preferred embodiment, only propylene units are detectable in the above-mentioned propylene homopolymer.

[0022] When the high melt strength polypropylene (HMS-PP) is a high melt strength random propylene copolymer (R-HMS-PP), it has a comonomer copolymerizable with propylene, for example, ethylene and / or C4~C 12 α-olefins, particularly ethylene and / or C4~C 10 α-olefins, such as comonomers such as 1-butene and / or 1-hexene. Preferably, the high melt strength random propylene copolymer (R-HMS-PP) has a comonomer copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene, and particularly consists of these monomers. More specifically, the high melt strength random propylene copolymer (R-HMS-PP) has units derived from ethylene and / or 1-butene apart from propylene. In a preferred embodiment, the high melt strength random propylene copolymer (R-HMS-PP) consists only of units derived from ethylene and propylene. The comonomer content in the high melt strength random propylene copolymer (R-HMS-PP) is preferably more than 0.2 mol.% and within the range of 10.0 mol.% or less, still more preferably more than 0.5 mol.% and within the range of 7.0 mol.% or less.

[0023] In this regard, it should be noted that the high melt strength polypropylene (HMS-PP), which is a high melt strength propylene homopolymer (H-HMS-PP) or a high melt strength random propylene copolymer (R-HMS-PP), may further have an unsaturated monomer different from the above-mentioned comonomer defined for the high melt strength random propylene copolymer (R-HMS-PP). In other words, the high melt strength propylene homopolymer (H-HMS-PP) or the high melt strength random propylene copolymer (R-HMS-PP) may have unsaturated units, for example, a bifunctionally unsaturated monomer and / or a multifunctionally unsaturated low molecular weight polymer, which will be defined in detail below, and these are different from propylene, ethylene and other C4~C 12 α-olefins. Therefore, the definitions of homopolymer and copolymer, in the case of high melt strength polypropylene (HMS-PP), actually mean unmodified polypropylene, that is, polypropylene (PP), preferably linear polypropylene (l-PP), which is used to obtain melt strength polypropylene (HMS-PP) by chemical modification defined in detail below.

[0024] Therefore, in one of the preferred embodiments, the high melt strength polypropylene (HMS-PP) is (a) when it is a high melt strength propylene homopolymer (H-HMS-PP), (i) propylene; and, (ii) a bifunctionally unsaturated monomer and / or a multifunctionally unsaturated low molecular weight polymer; units derived from; or, (b) when it is a high melt strength random propylene copolymer (R-HMS-PP), (i) propylene; (ii) ethylene and / or C4~C 12α-olefins, such as 1-butene and / or 1-hexene, preferably ethylene; and, (iii) difunctional unsaturated monomers and / or polyfunctional unsaturated low molecular weight polymers; units derived from; having.

[0025] The above "difunctional unsaturated" or "polyfunctional unsaturated" preferably means the presence of 2 or more non-aromatic double bonds, such as in divinylbenzene or cyclopentadiene or polybutadiene. Only such difunctional or polyfunctional unsaturated compounds that are polymerizable (preferably with the aid of free radicals) are used (see below). The unsaturated sites in the above difunctional or polyfunctional unsaturated compounds are not actually "unsaturated" in their chemically bonded state. This is because the above double bonds are each used for covalent bonding to the polymer chains of the unmodified polypropylene, i.e., polypropylene (PP), preferably linear polypropylene (l-PP).

[0026] The reaction of the above difunctional unsaturated monomers and / or polyfunctional unsaturated low molecular weight polymers, preferably having a number average molecular weight (Mn) ≤ 10,000 g / mol and being polyfunctional unsaturated low molecular weight polymers synthesized from 1 and / or 2 or more unsaturated monomers, with the unmodified polypropylene, i.e., polypropylene (PP), preferably linear polypropylene (l-PP), is carried out in the presence of a thermally free radical forming agent, such as a decomposing free radical-forming agent like a thermally decomposable peroxide.

[0027] The above difunctional unsaturated monomers are - divinyl compounds such as divinylaniline, m-divinylbenzene, p-divinylbenzene, divinylpentane, and divinylpropane; - allyl compounds such as allyl acrylate, allyl methacrylate, methyl allyl maleate and allyl vinyl ether; - dienes such as 1,3-butadiene, chloroprene, cyclohexadiene, cyclopentadiene, 2,3-dimethylbutadiene, heptadiene, hexadiene, isoprene and 1,4-pentadiene; - aromatic and / or aliphatic bis(maleimide) bis(citraconimide) and mixtures of these unsaturated monomers; may be.

[0028] Particularly preferred difunctional unsaturated monomers are 1,3-butadiene, isoprene, dimethylbutadiene and divinylbenzene.

[0029] The above polyfunctional unsaturated low molecular weight polymer, preferably a polyfunctional unsaturated low molecular weight polymer having a number average molecular weight (Mn) ≦ 10000 g / mol, may be synthesized from one or more unsaturated monomers.

[0030] Examples of such low molecular weight polymers are - polybutadiene, particularly those having different microstructures in the polymer chain, i.e., 1,4-cis, 1,4-trans and 1,2-(vinyl), mainly in the 1,2-(vinyl) configuration; - a copolymer of butadiene and styrene having 1,2-(vinyl) in the polymer chain; are.

[0031] Preferred low molecular weight polymers are polybutadiene, particularly polybutadiene in which more than 50.0% by weight of butadiene is in the 1,2-(vinyl) configuration.

[0032] High melt strength polypropylene (HMS-PP) may have more than one bifunctional unsaturated monomer and / or a polyfunctional unsaturated low molecular weight polymer. More preferably, the total amount of the bifunctional unsaturated monomer and the polyfunctional unsaturated low molecular weight polymer in the high melt strength polypropylene (HMS-PP) is 0.01 to 10.0% by weight based on the high melt strength polypropylene (HMS-PP).

[0033] In a preferred embodiment, the high melt strength polypropylene (HMS-PP) does not contain the additive (A). Therefore, when the polypropylene composition of the present invention contains the additive (A), these additives (A) are not introduced into the polypropylene composition during the production of the high melt strength polypropylene (HMS-PP).

[0034] Furthermore, the high melt strength polypropylene (HMS-PP) preferably usually has a low gel content of less than 1.00% by weight. Preferably, the gel content is less than 0.80% by weight, more preferably less than 0.50% by weight.

[0035] As described above, high melt strength polypropylene (HMS-PP) may be obtained by treating polypropylene (PP), preferably linear polypropylene (l-PP), with a thermal decomposable radical former. However, in such cases, there is a high risk that polypropylene (PP), preferably linear polypropylene (PP), will decompose, which is disadvantageous. Therefore, chemical modification is preferably carried out by additionally using a difunctional unsaturated monomer and / or a polyfunctional unsaturated low molecular weight polymer as chemically bonded crosslinking units. Suitable methods for obtaining high melt strength polypropylene (HMS-PP) are disclosed, for example, in EP0787750, EP0879830A1 and EP0890612A2. All documents are incorporated herein by reference. Thereby, the amount of the thermal decomposable radical former, preferably peroxide, is preferably in the range of 0.05 to 3.00% by weight based on the amount of polypropylene (PP). Usually, the thermal decomposable radical former is added to polypropylene (PP), preferably linear polypropylene (l-PP), together with a difunctional unsaturated monomer and / or a polyfunctional unsaturated low molecular weight polymer. However, it is also possible to first add the difunctional unsaturated monomer and / or the polyfunctional unsaturated low molecular weight polymer to polypropylene (PP), preferably linear polypropylene (l-PP), and then add the thermal decomposable radical former, or conversely, first add the thermal decomposable radical former to polypropylene (PP), preferably linear polypropylene (l-PP), and then add the difunctional unsaturated monomer and / or the polyfunctional unsaturated low molecular weight polymer, but this is less preferred.

[0036] Regarding the difunctional unsaturated monomer and / or the polyfunctional unsaturated low molecular weight polymer used in the production of high melt strength polypropylene (HMS-PP), the above section is referred to.

[0037] As described above, the difunctional unsaturated monomer and / or the polyfunctional unsaturated low molecular weight polymer are preferably used in the presence of a thermal decomposable free radical former.

[0038] The peroxide is a preferred thermal decomposable free radical forming agent. More preferably, the thermal decomposable free radical forming agent is selected from the group consisting of acyl peroxide, alkyl peroxide, hydroperoxide, perester and peroxycarbonate.

[0039] The following peroxides are particularly preferred:

[0040] Acyl peroxide: benzoyl peroxide, 4-chlorobenzoyl peroxide, 3-methoxybenzoyl peroxide and / or methylbenzoyl peroxide.

[0041] Alkyl peroxide: allyl t-butyl peroxide, 2,2-bis(t-butylperoxybutane), 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(t-butylperoxy)valerate, diisopropylaminomethyl-t-amyl peroxide, dimethylaminomethyl-t-amyl peroxide, diethylaminomethyl-t-butyl peroxide, dimethylaminomethyl-t-butyl peroxide, 1,1-di-(t-amylperoxy)cyclohexane, t-amyl peroxide, t-butyl cumyl peroxide, t-butyl peroxide and / or 1-hydroxybutyl n-butyl peroxide.

[0042] Peresters and peroxicarbonates: butyl peracetate, cumyl peracetate, cumyl perpropionate, cyclohexyl peracetate, di-t-butyl adipate, di-t-butyl azelate, di-t-butyl glutarate, di-t-butyl perthalate, di-t-butyl persebacate, 4-nitrocumyl perpropionate, 1-phenylethyl perbenzoate, phenylethyl nitro-perbenzoate, t-butyl bicyclo-(2,2,1)heptane percarboxylate, t-butyl-4-carbomethoxy perbutyrate, t-butyl cyclobutane percarboxylate, t-butyl cyclohexyl peroxicarbonate, t-butyl cyclopentyl percarboxylate, t-butyl cyclopropane percarboxylate, t-butyl dimethyl persinnamate, t-butyl-2-(2,2-diphenylvinyl) perbenzoate, t-butyl-4-methoxy perbenzoate, t-butyl perbenzoate, t-butyl carboxycyclohexane, t-butyl pernaphthoate, t-butyl peroxoisopropyl carbonate, t-butyl perotate, t-butyl-1-phenylcyclopropyl percarboxylate, t-butyl-2-propyl perpentene-2-oate, t-butyl-1-methylcyclopropyl percarboxylate, t-butyl-4-nitrophenyl peracetate, t-butyl nitrophenyl peroxylcarbamate, t-butyl-N-succinimidopercarboxylate, t-butyl percrotonate, t-butyl permaleic acid, t-butyl permethacrylate, t-butyl peroctoate, t-butyl peroxoisopropyl carbonate, t-butyl perisobutyrate, t-butyl peracrylate and / or t-butyl perpropionate.

[0043] Mixtures of these above free radical formers are also contemplated.

[0044] A suitable HMS-PP is WB140HMS (trademark) commercially available from Borealis AG.

[0045] Polypropylene (PP) As described above, high melt strength polypropylene (HMS-PP) is a modified polypropylene obtained by reacting polypropylene (PP) with a thermal decomposable free radical forming agent and optionally a bifunctional unsaturated monomer and / or a polyfunctional unsaturated low molecular weight polymer. The polypropylene (PP) is preferably linear polypropylene (l-PP).

[0046] The polypropylene (PP), preferably linear polypropylene (l-PP), preferably has a melt flow rate MFR2 (230 °C) in the range of 0.1 to 45.0 g / 10 min, for example 0.1 to 40.0 g / 10 min or 0.1 to 35.0 g / 10 min, more preferably 0.1 to 30.0 g / 10 min, still more preferably 0.1 to 28.0 g / 10 min, even more preferably 0.1 to 25.0 g / 10 min, as measured according to ISO 1133.

[0047] The high melt strength polypropylene (HMS-PP) differs from the polypropylene (PP) used in its production in that the backbone of the high melt strength polypropylene (HMS-PP) contains side chains. In contrast, the starting product, i.e., the polypropylene (PP) having preferably linear polypropylene (l-PP), contains no or almost no side chains. Side chains have a great influence on the rheology of polypropylene. Therefore, the starting product, i.e., the polypropylene (PP), and the resulting high melt strength polypropylene (HMS-PP) can be clearly distinguished by their flow behavior under stress.

[0048] Furthermore, as described above, the polypropylene (PP) is preferably linear polypropylene (l-PP). The same applies to the polypropylene (PP’) described in detail below, which is also preferably linear polypropylene (l-PP’) in a preferred embodiment. Thus, throughout the present invention, the term “linear polypropylene” indicates that the linear polypropylene exhibits no or almost no branched structure. Due to the absence of branching, linear polypropylene, namely linear polypropylene (l-PP) and linear polypropylene (l-PP’), preferably has low 30 melt extensibility and / or low 30 melt strength.

[0049] Therefore, linear polypropylene (l-PP) (a) an F within a range of less than 30.0 cN, preferably less than 27.0 cN, more preferably within a range of 1.0 cN or more and less than 30.0 cN, still more preferably within a range of 1.5 cN or more and less than 30.0 cN, yet still more preferably within a range of 2.0 cN or more and less than 27.0 cN, even still more preferably within a range of 2.5 cN or more and less than 27.0 cN 30 melt strength; and, (b) a v within a range of less than 220 mm / s, preferably less than 210 mm / s, more preferably within a range of 80 - 200 mm / s, most preferably within a range of 100 - 200 mm / s 30 melt extensibility; is preferably to have.

[0050] In other words, linear polypropylene (l-PP) has an F 30 melt strength of less than 30.0 cN and a v 30 melt extensibility of less than 220 mm / s, preferably an F 30 melt strength of less than 27.0 cN and a v 30 melt extensibility of less than 210 mm / s, more preferably an F 30 melt strength within a range of 1.0 cN or more and less than 30.0 cN and a v 30 melt extensibility within a range of 80 - 200 mm / s, still more preferably an F30 Melt strength and v within the range of 100 to 200 mm / s 30 Melt extensibility, and more preferably F within the range of 2.0 cN or more and less than 27.0 cN 30 Melt strength and v within the range of 100 to 200 mm / s 30 Melt extensibility, for example, F within the range of 2.5 cN or more and less than 27.0 cN 30 Preferably has a melt strength.

[0051] Therefore, in one of the specific embodiments, linear polypropylene (l-PP) is (a) Melt flow rate MFR2 (230 °C) within the range of 0.1 to 45.0 g / 10 min, for example 0.1 to 40.0 g / 10 min or 0.1 to 35.0 g / 10 min, more preferably 0.1 to 30.0 g / 10 min, still more preferably 0.1 to 28.0 g / 10 min, still more preferably 0.1 to 25.0 g / 10 min, as measured according to ISO 1133; and (b) F less than 30.0 cN, preferably less than 27.0 cN, more preferably within the range of 1.0 cN or more and less than 30.0 cN, still more preferably within the range of 1.5 cN or more and less than 30.0 cN, still more preferably within the range of 2.0 cN or more and less than 27.0 cN, and even more preferably within the range of 2.5 cN or more and less than 27.0 cN 30 Melt strength; and (c) v less than 220 mm / s, preferably less than 210 mm / s, more preferably within the range of 80 to 200 mm / s, and most preferably within the range of 100 to 200 mm / s 30 Melt extensibility; has.

[0052] Therefore, in one of the specific embodiments, polypropylene (PP) has a melt flow rate MFR2 (230 °C) of 0.1 to 45.0 g / 10 min, F less than 30.0 cN 30 Melt strength and v less than 220 mm / s 30 Melt extensibility, preferably a melt flow rate MFR2 (230 °C) within the range of 0.1 to 40.0 g / 10 min, F less than 30.0 cN30 Melt strength and v less than 210 mm / s 30 Melt extensibility, more preferably, melt flow rate MFR2 (230 °C) within the range of 0.1 to 35.0 g / 10 min, F within the range of 1.0 cN or more and less than 30.0 cN 30 Melt strength and v within the range of 80 to 200 mm / s 30 Melt extensibility, still more preferably, melt flow rate MFR2 (230 °C) within the range of 0.1 to 30.0 g / 10 min, F within the range of 1.5 cN or more and less than 30.0 cN 30 Melt strength and v within the range of 100 to 200 mm / s 30 Melt extensibility, even still more preferably, melt flow rate MFR2 (230 °C) within the range of 0.1 to 28.0 g / 10 min, F within the range of 2.0 cN or more and less than 27.0 cN 30 Melt strength and v within the range of 100 to 200 mm / s 30 Melt extensibility, for example, melt flow rate MFR2 (230 °C) within the range of 0.1 to 25.0 g / 10 min, F within the range of 2.5 cN or more and less than 27.0 cN 30 Melt strength and v within the range of 100 to 200 mm / s 30 It is linear polypropylene (l-PP) having melt extensibility.

[0053] Preferably, polypropylene (PP), preferably linear polypropylene (l-PP), has a melting point of at least 140 °C, more preferably at least 150 °C, still more preferably at least 158 °C.

[0054] Polypropylene (PP), preferably linear polypropylene (l-PP), can be produced by known methods, for example, by using single-site or Ziegler-Natta catalysts. Polypropylene (PP), preferably linear polypropylene (l-PP), can be a propylene homopolymer (H-PP), preferably a linear propylene homopolymer (l-H-PP), or a propylene copolymer (R-PP), preferably a linear propylene copolymer (l-R-PP). Regarding the comonomer content and the type of comonomer, the information described above for high melt strength random propylene copolymers (R-HMS-PP) is referred to. Preferably, polypropylene (PP) is linear polypropylene (l-PP). Even more preferably, polypropylene (PP) is a linear propylene homopolymer (l-H-PP). Therefore, the melt flow rate MFR2 (230 °C), melting point, F 30 Melt strength, v 30 All the information described respectively for melt extensibility and particle size and particle size distribution applies, in particular, to linear propylene homopolymers (l-H-PP).

[0055] In a preferred embodiment, polypropylene (PP), preferably linear polypropylene (l-PP), does not contain additive (A). Therefore, when the polypropylene composition of the present invention contains additive (A), these additives (A) are preferably not introduced into the polypropylene composition during the production of high melt strength polypropylene (HMS-PP).

[0056] Recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) The above polypropylene composition preferably has recycled polypropylene (R-PP) and / or linear polypropylene (L-PP). That is, the above polypropylene composition may have a mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP). Alternatively, the above polypropylene composition has recycled polypropylene (R-PP) or linear polypropylene (L-PP).

[0057] Preferably, the polypropylene composition has recycled polypropylene (R-PP) and linear polypropylene (L-PP), i.e., a mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP).

[0058] Recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) preferably have at least one of the following properties: a) MFR of 3 to 25 g / 10 min determined according to ISO 1133 under a temperature of 230 °C and a load of 2.16 kg; b) F of less than 25.0 cN determined according to ISO 16790:2005 30 Melt strength.

[0059] In one aspect, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) has F of less than 25.0 cN determined according to ISO 16790:2005 30 Melt strength, or has at least MFR of 3 to 25 g / 10 min measured according to ISO 1133 under a temperature of 230 °C and a load of 2.16 kg. Alternatively, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) has F of less than 25.0 cN determined according to ISO 16790:2005 30 Melt strength, and has at least MFR of 3 to 25 g / 10 min measured according to ISO 1133 under a temperature of 230 °C and a load of 2.16 kg.

[0060] Recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) preferably have a melt flow rate MFR2 (230 °C) within the range of 4 to 20 g / 10 min, more preferably within the range of 5 to 15 g / 10 min, measured according to ISO 1133.

[0061] Preferably, the recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) has an F within the range of less than 20.0 cN, more preferably 1.0 cN or more and less than 20.0 cN, as determined according to ISO 16790:2005. 30 Preferably has a melt strength.

[0062] For example, the recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) preferably has an F within the range of less than 20.0 cN, as determined according to ISO 16790:2005. 30 A melt strength, and a melt flow rate MFR2 (230°C) within the range of 4 to 20 g / 10 min, as measured according to ISO 1133, more preferably an F within the range of 1.0 cN or more and less than 20.0 cN, as determined according to ISO 16790:2005. 30 A melt strength, and a melt flow rate MFR2 (230°C) within the range of 5 to 15 g / 10 min.

[0063] For example, the recycled polypropylene (R-PP) has at least one of the following characteristics: a) An MFR of 3 to 25 g / 10 min, as determined according to ISO 1133 under a temperature of 230°C and a load of 2.16 kg; b) An F melt strength of less than 25.0 cN, as determined according to ISO 16790:2005. 30 A melt strength; c) A v melt extensibility of greater than 200 mm / s, as determined according to ISO 16790:2005. 30 A melt extensibility.

[0064] For example, the recycled polypropylene (R-PP) has an F melt strength of less than 25.0 cN, as determined according to ISO 16790:2005. 30 A melt strength, and / or a v melt extensibility of greater than 200 mm / s, as determined according to ISO 16790:2005. 30 Preferably has at least a melt extensibility, more preferably, the recycled polypropylene (R-PP) has an F melt strength of less than 25.0 cN, as determined according to ISO 16790:2005. 30Melt strength and v greater than 200 mm / s as determined according to ISO 16790:2005 30 Has at least melt extensibility, and more preferably, recycled polypropylene (R-PP) has an F of less than 25.0 cN as determined according to ISO 16790:2005 30 Melt strength, v greater than 200 mm / s as determined according to ISO 16790:2005 30 Has at least melt extensibility and an MFR of 3 - 25 g / 10 min as determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg

[0065] Preferably, recycled polypropylene (R-PP) has a v greater than 205 mm / s, more preferably greater than 205 mm / s and less than or equal to 290 mm / s as determined according to ISO 16790:2005 30 Has melt extensibility

[0066] In one aspect, recycled polypropylene (R-PP) has an F of less than 20.0 cN as determined according to ISO 16790:2005 30 Melt strength and v greater than 205 mm / s as determined according to ISO 16790:2005 30 Melt extensibility and a melt flow rate MFR2 (230 °C) in the range of 4 - 20 g / 10 min as measured according to ISO 1133, more preferably an F in the range of 1.0 cN or more and less than 20.0 cN as determined according to ISO 16790:2005 30 Melt strength and v greater than 205 mm / s and less than or equal to 290 mm / s as determined according to ISO 16790:2005 30 Has melt extensibility and a melt flow rate MFR2 (230 °C) in the range of 5 - 15 g / 10 min as measured according to ISO 1133

[0067] Alternatively, linear polypropylene (L-PP) has at least one of the following properties: a) MFR of 3 to 25 g / 10 min, determined in accordance with ISO 1133 at a temperature of 230 °C and a load of 2.16 kg; b) F 30 Melt strength less than 25.0 cN, determined in accordance with ISO 16790:2005; c) v 30 Melt extensibility greater than 200 mm / s, determined in accordance with ISO 16790:2005.

[0068] In one embodiment, the linear polypropylene (L-PP) has at least an F 30 Melt strength less than 25.0 cN, determined in accordance with ISO 16790:2005, and / or a v 30 Melt extensibility less than 200 mm / s, determined in accordance with ISO 16790:2005. More preferably, the linear polypropylene (L-PP) has at least an F 30 Melt strength less than 25.0 cN, determined in accordance with ISO 16790:2005, and a v 30 Melt extensibility less than 200 mm / s, determined in accordance with ISO 16790:2005. Even more preferably, the linear polypropylene (L-PP) has at least an F 30 Melt strength less than 25.0 cN, determined in accordance with ISO 16790:2005, a v 30 Melt extensibility less than 200 mm / s, determined in accordance with ISO 16790:2005, and an MFR of 3 to 25 g / 10 min, determined in accordance with ISO 1133 at a temperature of 230 °C and a load of 2.16 kg.

[0069] Preferably, the linear polypropylene (L-PP) has a v 30 Melt extensibility less than 190 mm / s, more preferably in the range of 100 mm / s or more and less than 190 mm / s, and most preferably in the range of 120 mm / s or more and less than 190 mm / s, determined in accordance with ISO 16790:2005.

[0070] For example, the linear polypropylene (L-PP) has an F30 Melt strength, v less than 190 mm / s determined according to ISO 16790:2005 30 Melt extensibility and has at least an MFR of 3 - 25 g / 10min determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg. Preferably, linear polypropylene (L-PP) has an F of less than 25.0 cN determined according to ISO 16790:2005 30 Melt strength, v within the range of 100 mm / s or more and less than 190 mm / s determined according to ISO 16790:2005 30 Melt extensibility and has at least an MFR of 3 - 25 g / 10min determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg. More preferably, linear polypropylene (L-PP) has an F of less than 25.0 cN determined according to ISO 16790:2005 30 Melt strength, v within the range of 120 mm / s or more and less than 190 mm / s determined according to ISO 16790:2005 30 Melt extensibility and has at least an MFR of 3 - 25 g / 10min determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg.

[0071] In one aspect, linear polypropylene (L-PP) has an F of less than 20.0 cN determined according to ISO 16790:2005 30 Melt strength and v within the range of 100 mm / s or more and less than 190 mm / s determined according to ISO 16790:2005 30 Melt extensibility and a melt flow rate MFR2 (230 °C) within the range of 4 - 20 g / 10min measured according to ISO 1133, more preferably an F within the range of 1.0 cN or more and less than 20.0 cN determined according to ISO 16790:2005 30 Melt strength and v of 120 mm / s or more and less than 190 mm / s determined according to ISO 16790:2005 30 Melt extensibility and has a melt flow rate MFR2 (230 °C) within the range of 5 - 15 g / 10min measured according to ISO 1133.

[0072] Alternatively, the above mixture having recycled polypropylene (R-PP) and linear polypropylene (L-PP) preferably has at least one of the following properties: a) MFR of 3 to 25 g / 10 min, determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg; b) F < 25.0 cN, determined according to ISO 16790:2005 30 Melt strength; c) v > 100 mm / s, preferably > 100, and ≤ 290 mm / s, determined according to ISO 16790:2005 30 Melt extensibility.

[0073] In one aspect, the above mixture having recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F < 25.0 cN 30 Melt strength and / or a v > 100 mm / s, determined according to ISO 16790:2005 30 Melt extensibility, and more preferably, the above mixture having recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F < 25 cN 30 Melt strength and a v > 100 mm / s, determined according to ISO 16790:2005 30 Melt extensibility, and even more preferably, the above mixture having recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F < 25.0 cN 30 Melt strength, a v > 100 mm / s, determined according to ISO 16790:2005 30 Melt extensibility, and at least has an MFR of 3 to 25 g / 10 min, determined according to ISO 1133 at a temperature of 230 °C and a load of 2.16 kg.

[0074] For example, the above mixture having recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F of less than 20.0 cN determined according to ISO 16790:2005 30 melt strength, and a v greater than 100 mm / s determined according to ISO 16790:2005 30 melt extensibility, and a melt flow rate MFR2 (230 °C) in the range of 4 to 20 g / 10 min measured according to ISO 1133, more preferably an F in the range of 1.0 cN or more and less than 20.0 cN determined according to ISO 16790:2005 30 melt strength, and a v greater than 100 mm / s and less than or equal to 290 mm / s determined according to ISO 16790:2005 30 melt extensibility, and a melt flow rate MFR2 (230 °C) in the range of 5 to 15 g / 10 min measured according to ISO 1133.

[0075] Recycled polypropylene (R-PP) polypropylene (L-PP) may be recycled polypropylene (Rec-PP), and / or linear polypropylene (L-PP) may be linear polypropylene (Lin-PP).

[0076] Linear polypropylene (Lin-PP) can be produced by known methods, for example, by using a single-site or Ziegler-Natta catalyst. Linear polypropylene (Lin-PP) can be a linear propylene homopolymer (Lin-H-PP) or a linear propylene random copolymer (Lin-Ran-PP).

[0077] Linear propylene random copolymer (Lin-Ran-PP) is a monomer copolymerizable with propylene, for example, ethylene and / or C4~C 12 α-olefins, especially ethylene and / or C4~C 10It has comonomers such as α-olefins, for example 1-butene and / or 1-hexene. Preferably, the linear propylene random copolymer (Lin-Ran-PP) has monomers copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene, and particularly consists of these monomers. More specifically, the linear propylene random copolymer (Lin-Ran-PP) has units derived from ethylene and / or 1-butene in addition to propylene. In a preferred embodiment, the linear propylene random copolymer (Lin-Ran-PP) consists only of units derived from ethylene and propylene.

[0078] The comonomer content in the linear propylene random copolymer (Lin-Ran-PP) is preferably greater than 0.2 mol.%, within the range of 10.0 mol.% or less, and more preferably greater than 0.5 mol.%, within the range of 7.0 mol.% or less.

[0079] Preferably, the recycled polypropylene (R-PP) and / or polypropylene (L-PP) is recycled polypropylene (Rec-PP) having at least 50 wt% recycled high melt strength polypropylene (HMS-PP), more preferably at least 75 wt% recycled high melt strength polypropylene (HMS-PP), and most preferably at least 85 wt% recycled high melt strength polypropylene (HMS-PP). The balance of the recycled polypropylene (Rec-PP) may be derived from, for example, cover layers used in cup manufacturing and the like.

[0080] Nucleating agent (NA) The polypropylene composition (PC) further has one or more, preferably one, nucleating agent.

[0081] Generally, it is preferred that the polypropylene composition (PC) can have any nucleating agent commonly used in the products to be manufactured and known to those skilled in the art.

[0082] For example, suitable nucleating agents include phosphorus-based nucleating agents, such as mono-, bis- or tetra-phenyl phosphate, or organic alpha-nucleating agents selected from the group of metal salts of phosphate esters represented by the following formula.

[0083]

Chemical formula

[0084] (In the formula, R1 is oxygen, sulfur or a hydrocarbon group having 1 to 10 carbon atoms; each of R2 and R3 is hydrogen, a hydrocarbon or a hydrocarbon group having 1 to 10 carbon atoms; R2 and R3 may be the same as or different from each other, and two R2s, two R3s, or R2 and R3 may combine to form a ring together; M is a monovalent to trivalent metal atom; n is an integer of 1 to 3; m is 0 or 1, provided that n > m.)

[0085] Preferred examples of the alpha nucleating agent represented by the above formula include the following: Sodium-2,2'-methylene-bis(4,6-di-tert.-butyl-phenyl) phosphate, Sodium-2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl)-phosphate, Lithium-2,2'-methylene-bis(4,6-di-tert.-butylphenyl) phosphate, Lithium-2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl) phosphate, Sodium-2,2'-ethylidene-bis(4-i-propyl-6-tert.-butylphenyl) phosphate, Lithium-2,2'-methylene-bis(4-methyl-6-tert.-butylphenyl) phosphate, Lithium-2,2'-methylene-bis(4-ethyl-6-tert.-butylphenyl) phosphate, Calcium-bis[2,2'-thiobis(4-methyl-6-tert.-butyl-phenyl)-phosphate], Calcium - bis[2,2’ - thiobis(4 - ethyl - 6 - tert - butylphenyl) - phosphate], Calcium - bis[2,2’ - thiobis(4,6 - di - tert - butylphenyl)phosphate], Magnesium - bis[2,2’ - thiobis(4,6 - di - tert - butylphenyl)phosphate], Magnesium - bis[2,2’ - thiobis(4 - t - octylphenyl)phosphate], Sodium - 2,2’ - butylidene - bis(4,6 - dimethylphenyl)phosphate, Sodium - 2,2’ - butylidene - bis(4,6 - di - tert - butyl - phenyl) - phosphate, Sodium - 2,2’ - t - octylmethylene - bis(4,6 - dimethyl - phenyl) - phosphate, Sodium - 2,2’ - t - octylmethylene - bis(4,6 - di - tert - butylphenyl)phosphate, Calcium - bis[2,2’ - methylene - bis(4,6 - di - tert - butylphenyl) - phosphate], Magnesium - bis[2,2’ - methylene - bis(4,6 - di - tert - butylphenyl) - phosphate], Barium - bis[2,2’ - methylene - bis(4,6 - di - tert - butylphenyl) - phosphate], Sodium - 2,2’ - methylene - bis(4 - methyl - 6 - tert - butylphenyl) - phosphate, Sodium - 2,2’ - methylene - bis(4 - ethyl - 6 - tert - butylphenyl)phosphate, Sodium(4,4’ - dimethyl - 5,6’ - di - tert - butyl - 2,2’ - biphenyl)phosphate, Calcium - bis - [(4,4’ - dimethyl - 6,6’ - di - tert - butyl - 2,2’ - biphenyl)phosphate], Sodium - 2,2’ - ethylidene - bis(4 - m - butyl - 6 - tert - butyl - phenyl)phosphate, Sodium-2,2'-methylene-bis-(4,6-di-methylphenyl)-phosphate, Sodium-2,2'-methylene-bis(4,6-di-t-ethyl-phenyl)phosphate, Potassium-2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl)-phosphate, Calcium-bis[2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl)-phosphate], Magnesium-bis[2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl)-phosphate], Barium-bis[2,2'-ethylidene-bis-(4,6-di-tert.-butylphenyl)-phosphate], Aluminum-hydroxy-bis[2,2'-methylene-bis(4,6-di-tert.-butyl-phenyl)phosphate], Aluminum-tris[2,2'-ethylidene-bis(4,6-di-tert.-butylphenyl)-phosphate].

[0086] As a second group of phosphorus-based nucleating agents, for example, aluminum-hydroxy-bis[2,4,8,10-tetrakis(1,1-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxaphosphocin-6-oxidato] and its blend with Li-myristate or Li-stearate can be mentioned.

[0087] In addition, sorbitol-based nucleating agents, for example, optionally substituted dibenzylidene sorbitol (e.g., 1,3:2,4-dibenzylidene sorbitol, 1,3:2,4-di(methylbenzylidene) sorbitol, 1,3:2,4-di(ethylbenzylidene) sorbitol, 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol, etc.) or pine rosin can be used as nucleating agents.

[0088] Further suitable alpha-nucleating agents are polymeric nucleating agents selected from the group consisting of vinyl cycloalkane polymers and vinyl alkane polymers. Nucleation by these polymeric nucleating agents is carried out by a special reactor technique of pre-polymerizing a catalyst with a monomer such as vinyl cyclohexane (VCH), etc., or by blending a propylene polymer with a vinyl(cyclo)alkane polymer. These methods are described in great detail, for example, in EP0316187A2 and WO99 / 24479, the disclosures of which are incorporated herein by reference.

[0089] Suitable alpha-nucleating agents for the polyolefin composition of the present invention are, in addition, for example, the nucleating agents described in Macromolecules 2005, 38, 3688 - 3695, the disclosure of which is incorporated herein by reference.

[0090] Nucleating agents such as ADK NA-11 (sodium methylene-bis(4,6-di-t-butylphenyl) phosphate) and ADK NA-21 (aluminum hydroxy-bis[2,4,8,10-tetrakis(1,1-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxaphosphocin-6-oxidate]) are also suitable and are commercially available from Asahi Denka Kokai. Millad 3988 (3,4-dimethylbenzylidene sorbitol), Millad 3905, and Millad 3940 available from Milliken&Company are other examples of nucleating agents that can be used in the present invention.

[0091] Further commercially available alpha-nucleating agents that can be used in the composition of the present invention are, for example, Irgaclear XT 386 (N-[3,5-bis-(2,2-dimethyl-propionylamino)-phenyl]-2,2-dimethylpropionamide) from Ciba Speciality Chemicals, Hyperform HPN-68L and Hyperform HPN-20E from Milliken&Company.

[0092] Nonitol-based nucleating agents, for example, 1,2,3-trideoxy-4,6:5,7-bis-O-((4-propylphenyl)methylene)nonitol (CAS number 882073-43-0, for example, Millad NX8000, supplier Milliken) are also suitable.

[0093] A further suitable nucleating agent is a chemical blowing agent available from Clariant under the trade name "Hydrocerol".

[0094] Talc is a further suitable nucleating agent.

[0095] Talc is particularly preferred. In a preferred embodiment, talc is the only nucleating agent present in the polypropylene composition (PC).

[0096] The particle size d50 of the nucleating agent, for example talc, is in the range of 1 μm to 30 μm, preferably in the range of 2 μm to 25 μm, more preferably in the range of 5 μm to 20 μm, and most preferably in the range of 5 μm to 15 μm.

[0097] Additive (A) Additive (A) can be high melt strength polypropylene (HMS-PP) and any additives useful in the technical field of its application. Thus, in the polypropylene composition of the present invention, i.e., as additive (A) used in the form of an additive mixture (AM), examples of additive (A) include stabilizers such as antioxidants (e.g., sterically hindered phenols, phosphites / phosphonites, sulfur-containing antioxidants, alkyl radical scavengers, aromatic amines, hindered amine stabilizers, or blends thereof), metal deactivators (e.g., Irganox MD1024), or UV stabilizers (e.g., hindered amine light stabilizers), but are not limited thereto. Other typical additives are modifiers such as antistatic agents or anti-fogging agents (e.g., ethoxylated amines and amides, or glycerol esters), acid scavengers, adhesives (e.g., polyisobutene), lubricants and resins (ionomer waxes, PE- and ethylene copolymer waxes, Fischer-Tropsch waxes, montan waxes, fluorinated compounds, or paraffin waxes), and slip and antiblocking agents (e.g., Ca-stearate, erucamide, oleamide, talc, natural and synthetic silica, or zeolite). Preferably, additive (A) is selected from the group consisting of antioxidants (e.g., sterically hindered phenols, phosphites / phosphonites, sulfur-containing antioxidants, alkyl radical scavengers, aromatic amines, hindered amine stabilizers, or blends thereof), metal deactivators (e.g., Irganox MD1024), UV stabilizers (e.g., hindered amine light stabilizers), antistatic agents or anti-fogging agents (e.g., ethoxylated amines and amides, or glycerol esters), acid scavengers, adhesives (e.g., polyisobutene), lubricants and resins (ionomer waxes, PE- and ethylene copolymer waxes, Fischer-Tropsch waxes, montan waxes, fluorinated compounds, or paraffin waxes), slip agents (e.g., Ca-stearate), antiblocking agents (e.g., erucamide, oleamide, talc, natural and synthetic silica, or zeolite), or mixtures thereof.

[0098] Preferred additives are slip agents such as Ca-stearate and the like.

[0099] As outlined above, additive (A) does not contain a nucleating agent.

[0100] Generally, the total amount of additive (A) is 15% by weight or less, more preferably 10% by weight or less, for example, in the range of 0.1 - 10% by weight, preferably 0.1 - 5% by weight, more preferably 0.2 - 1% by weight, based on the total weight of the above polypropylene composition.

[0101] Polypropylene composition The above polypropylene composition is: - 10.0 - 50.0% by weight, preferably 15.0 - 40.0% by weight, more preferably 20.0 - 30.0% by weight of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP); - 40.0 - 89.95% by weight, preferably 57.5 - 84.95% by weight, more preferably 69.0 - 79.9% by weight of high melt strength polypropylene (HMS-PP) having an F greater than 25.0 cN 30 Melt strength and a v greater than 205 mm / s 30 Melt extensibility, and F 30 Melt strength and v 30 Melt extensibility determined according to ISO 16790:2005, high melt strength polypropylene (HMS-PP); and, - 0.05 - 10.0% by weight, preferably 1.0 - 8.0% by weight, more preferably 4.0 - 6.0% by weight, for example 5.0 - 6.0% by weight of a nucleating agent (NA); has.

[0102] Unless otherwise specified, all amounts are preferably based on the total weight of the above polypropylene composition.

[0103] The total amount of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) present in the above polypropylene composition is 10.0 to 50.0% by weight, preferably 15.0 to 40.0% by weight, more preferably 20.0 to 30.0% by weight.

[0104] The high melt strength polypropylene (HMS-PP) present in the above polypropylene composition, with an F greater than 25.0 cN 30 Melt strength and a v greater than 205 mm / s 30 Having melt extensibility, with an F 30 Melt strength and a v 30 The total amount of high melt strength polypropylene (HMS-PP) whose melt strength and melt extensibility are determined according to ISO 16790:2005 is 40.0 to 89.95% by weight, preferably 57.5 to 84.95% by weight, more preferably 69.0 to 79.9% by weight.

[0105] The total amount of nucleating agent (NA) present in the above polypropylene composition is 0.05 to 10.0% by weight, preferably 1.0 to 8.0% by weight, more preferably 4.0 to 6.0% by weight, for example 5.0 to 6.0% by weight.

[0106] In a preferred embodiment, the total amount of polymers other than recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) and high melt strength polypropylene (HMS-PP) does not exceed 5% by weight, more preferably does not exceed 2% by weight, still more preferably does not exceed 1% by weight, based on the total weight of the polymer materials present in the above polypropylene composition.

[0107] As described above, high melt strength polypropylene (HMS-PP) is the main part of the polypropylene composition of the present invention. Therefore, it is preferable that the final polypropylene composition exhibits a rheological behavior similar to that of high melt strength polypropylene (HMS-PP).

[0108] Therefore, the above polypropylene composition has an F greater than 25.0 cN 30 Melt strength and a v greater than 205 mm / s 30It has melt extensibility, preferably greater than 25.0 cN and 50.0 cN or less for F 30 Melt strength and v greater than 205 mm / s and 300 mm / s or less 30 Preferably having melt extensibility imparts good shear thinning characteristics to the resulting polypropylene composition. F 30 Melt strength and v 30 The melt extensibility is measured according to ISO 16790:2005.

[0109] In a preferred embodiment, the polypropylene composition is (a) F greater than 25.0 cN and 45.0 cN or less, preferably greater than 25.0 cN and 42.0 cN or less, most preferably greater than 25.0 cN and 40.0 cN or less 30 Melt strength; And, (b) v greater than 210 mm / s and 300 mm / s or less, more preferably 215 - 290 mm / s, still more preferably 220 - 270 mm / s, most preferably 225 - 260 mm / s 30 Melt extensibility; Has.

[0110] In a particularly preferred embodiment, the polypropylene composition is F greater than 25.0 cN and 45.0 cN or less 30 Melt strength and v of 215 - 290 mm / s 30 Melt extensibility, for example, F greater than 25.0 cN and 42.0 cN or less 30 Melt strength and v of 215 - 290 mm / s 30 Melt extensibility, or F greater than 25.0 cN and 40.0 cN or less 30 Melt strength and v of 220 - 270 mm / s 30 Melt extensibility, or F greater than 25.0 cN and 40.0 cN or less 30 Melt strength and v of 225 - 260 mm / s 30 Has melt extensibility.

[0111] Furthermore, the polypropylene composition preferably has a melt flow rate MFR2 (230°C) of 15.0 g / 10 min or less, more preferably in the range of 0.5 to 15.0 g / 10 min, still more preferably in the range of 1.0 to 15.0 g / 10 min, for example in the range of 1.5 to 15.0 g / 10 min, as measured according to ISO 1133.

[0112] In a particularly preferred embodiment, the polypropylene composition has a melt flow rate MFR2 (230°C) of 7.0 g / 10 min or less, preferably in the range of 0.5 to 7.0 g / 10 min, more preferably in the range of 0.5 to 6.5 g / 10 min, still more preferably in the range of 0.5 to 6.0 g / 10 min, still more preferably in the range of 1.0 to 6.0 g / 10 min, for example in the range of 1.5 to 5.0 g / 10 min, as measured according to ISO 1133.

[0113] Thus, in one of the specific embodiments, the polypropylene composition (a) has a melt flow rate MFR2 (230°C) of 15.0 g / 10 min or less, more preferably in the range of 0.5 to 15.0 g / 10 min, still more preferably in the range of 1.0 to 15.0 g / 10 min, for example in the range of 1.5 to 15.0 g / 10 min; (b) has an F melt strength greater than 25.0 cN and 45.0 cN or less, preferably greater than 25.0 cN and 42.0 cN or less, most preferably greater than 25.0 cN and 40.0 cN or less 30 ; and, (c) has a v melt extensibility greater than 210 mm / s and 300 mm / s or less, more preferably in the range of 215 to 290 mm / s, still more preferably in the range of 220 to 270 mm / s, most preferably in the range of 225 to 260 mm / s 30 . It has.

[0114] In a particularly preferred variant of this embodiment, the polypropylene composition has a melt flow rate MFR2 (230 °C) of 7.0 g / 10 min or less, preferably in the range of 0.5 to 7.0 g / 10 min, more preferably in the range of 0.5 to 6.5 g / 10 min, still more preferably in the range of 0.5 to 6.0 g / 10 min, even more preferably in the range of 1.0 to 6.0 g / 10 min, for example in the range of 1.5 to 5.0 g / 10 min, as measured according to ISO 1133.

[0115] Thus, in certain embodiments, the polypropylene composition has a melt flow rate MFR2 (230 °C) in the range of 0.5 to 15.0 g / 10 min, an F greater than 25.0 cN and 45.0 cN or less 30 Melt strength and a v of 215 to 290 mm / s 30 Melt extensibility, for example, a melt flow rate MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and 42.0 cN or less 30 Melt strength and a v of 215 to 290 mm / s 30 Melt extensibility, or a melt flow rate MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and 40.0 cN or less 30 Melt strength and a v of 220 to 270 mm / s 30 Melt extensibility, or a melt flow rate MFR2 (230 °C) in the range of 1.0 to 15.0 g / 10 min, an F greater than 25.0 cN and 40.0 cN or less 30 Melt strength and a v of 225 to 260 mm / s 30 And has melt extensibility.

[0116] In a particularly preferred variation of this embodiment, the above polypropylene composition has a melt flow rate MFR2 (230 ° C) of 7.0 g / 10 min or less, preferably in the range of 0.5 to 7.0 g / 10 min, more preferably in the range of 0.5 to 6.5 g / 10 min, still more preferably in the range of 0.5 to 6.0 g / 10 min, still more preferably in the range of 1.0 to 6.0 g / 10 min, for example in the range of 1.5 to 5.0 g / 10 min, or, for example, in the range of 1.0 to 5.0 g / 10 min, as measured according to ISO 1133.

[0117] Foamed sheet The present invention further relates to a foamed sheet formed from the polypropylene composition of the present invention.

[0118] The foamed sheet of the present invention preferably has a thickness of 0.5 to 10 mm and / or a density of 150 to 250 kg / m 3 and most preferably 175 to 225 kg / m 3 Accordingly, in one aspect, the present invention relates to a foamed sheet having a thickness of 0.5 to 10 mm and / or a density of 100 to 300 kg / m 3 , more preferably 150 to 250 kg / m 3 , most preferably 175 to 225 kg / m 3 .

[0119] Preferably, the thickness is 0.5 to 7.5 mm, more preferably 0.5 to 5.0 mm, particularly preferably 0.7 to 2.5 mm, for example 0.7 to 1.1 mm.

[0120] The above foamed sheet preferably has a cell size diameter of 100 to 500 μm, more preferably 125 to 400 μm, and most preferably 170 to 320 μm, as determined by an optical microscope.

[0121] The above foamed sheet is further characterized by its surface roughness. Usually, the surface roughness is less than 3.5 μm, preferably less than 2.5 μm, and most preferably less than 1.5 μm.

[0122] The foamed sheet is preferably covered with a cover layer (CL).

[0123] The cover layer (CL) preferably has a density of at least 0.85 g / cm 3 .

[0124] Preferably, the cover layer (CL) preferably has an amount of polypropylene (CL-PP) of at least 50% by weight, more preferably at least 65% by weight, and most preferably at least 80% by weight.

[0125] When the cover layer (CL) has polypropylene (CL-PP), the polypropylene (CL-PP) preferably has an MFR2 of 10 - 26 g / 10 min, determined in accordance with ISO 1133 under a temperature of 230 °C and a load of 2.16 kg.

[0126] The cover layer may have one or more fillers of up to 50% by weight, preferably 35% by weight or less, and most preferably 20% by weight or less. The term filler means any mineral filler or non-mineral filler that can be uniformly incorporated into the polyolefin composition. The one or more fillers are preferably inorganic fillers selected from, for example, glass fibers, talc, carbon fibers, chalk, clay, flint, metal carbonates, mica, kaolin, wollastonite, feldspar, and barytes.

[0127] The polypropylene (CL-PP) is preferably selected from the group consisting of a cast film of polypropylene, an inflation film of polypropylene, and a biaxially oriented polypropylene (BOPP) film. More preferably, the polypropylene (CL-PP) is a biaxially oriented polypropylene (BOPP) film.

[0128] The thickness of the cover layer (CL) is preferably not more than 100 μm, more preferably 5 to 40 μm, and most preferably 10 to 30 μm.

[0129] The cover layer may be directly adjacent to the foamed sheet of the present invention.

[0130] An adhesive layer (AL) may be present between the foamed sheet and the cover layer (CL) of the present invention.

[0131] When such an adhesive layer (AL) is present, the adhesive layer (AL) preferably has a polyethylene - polypropylene blend (PE - PP) having a PE:PP weight ratio of 5:95 to 95:5, preferably 5:95 to 50:50, more preferably 5:95 to 30:70, and most preferably 10:90 to 20:80.

[0132] When the adhesive layer (AL) is present, its thickness is usually greater than that of the cover layer (CL).

[0133] When the adhesive layer (AL) is present, its thickness is preferably not more than 120 μm, more preferably 20 to 80 μm, even more preferably 30 to 70 μm, and most preferably 40 to 60 μm.

[0134] However, preferably, the foamed sheet and the cover layer (CL) are directly adjacent. That is, no adhesive layer (AL) is present between the foamed sheet of the present invention and the cover layer (CL).

[0135] More preferably, there is no additional layer other than the foamed sheet and the cover layer.

[0136] Article The present invention further relates to an article having the above - mentioned foamed sheet, preferably an article having the above - mentioned foamed sheet covered with the cover layer (CL) of the present invention.

[0137] The above article may be a container, such as a bottle, cup, can, cannister, bowl or tray; a sleeve, such as a sleeve for a container; a lid, such as a lid for a container; a film; a blank; a pad; a carrier; a tube; a substrate; a pipe; a vessel; a panel, such as a structural panel; a liner, such as a truck liner; a tape; a roll or a shaped material.

[0138] The above article is preferably a container.

[0139] The above container preferably has a foamed sheet coated with the cover layer (CL) of the present invention, in which case the cover layer (CL) is located inside the above container. The inside is the side where the liquid is put.

[0140] The above container may be, for example, a bottle, cup, can, cannister, bowl or tray.

[0141] In a particularly preferred embodiment, the above container is a cup, preferably the body of the above cup has the foamed sheet of the present invention, more preferably consists of the foamed sheet of the present invention. Preferably, the body of the above cup has a cover layer (CL) inside.

[0142] By using the foamed sheet of the present invention as the cup body, for example, when containing cold beverages or hot beverages, excellent heat insulation can be obtained. Further, since the above cover layer is located inside the cup, the holes of the foamed sheet are sealed against the liquid inside the cup, so the absorption of the liquid into the cup is minimized. Usually, in a cup, in order to ensure sufficient printability, a cover layer is arranged outside the cup. However, since the foamed sheet of the present invention itself has good printability, it is not necessary to provide a special layer for that purpose on the outside.

[0143] Method As outlined above, high melt strength polypropylene (HMS-PP) is produced by using polypropylene (PP), preferably linear polypropylene (l-PP). This method involves at least step (a) of reacting polypropylene (PP) with a thermal decomposable free radical former and optionally a bifunctional unsaturated monomer and / or a polyfunctional unsaturated low molecular weight polymer to obtain high melt strength polypropylene (HMS-PP).

[0144] The present invention further relates to a method having the following steps: a) - 10.0 to 50.0 wt%, preferably 15.0 to 40.0 wt%, more preferably 20.0 to 30.0 wt% of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP); - 40 to 89.95 wt%, preferably 57.5 to 84.95 wt%, more preferably 69.0 to 79.9 wt% of high melt strength polypropylene (HMS-PP) having an F 30 melt strength greater than 25.0 cN and a v 30 melt extensibility, and an F 30 melt strength and a v 30 melt extensibility determined according to ISO 16790:2005; and, - 0.05 to 10 wt%, preferably 1.0 to 8.0 wt%, more preferably 4.0 to 6.0 wt%, for example 5.0 to 6.0 wt% of a nucleating agent (NA); This is a step of producing a polypropylene composition having, a step of simultaneously or sequentially mixing recycled polypropylene (R-PP) and / or linear polypropylene (L-PP), high melt strength polypropylene (HMS-PP) and a nucleating agent (NA) in a mixing device.

[0145] In step a), the total amount of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) present in the above polypropylene composition is 10.0 to 50.0% by weight, preferably 15.0 to 40.0% by weight, more preferably 20.0 to 30.0% by weight.

[0146] In step a), high melt strength polypropylene (HMS-PP) present in the above polypropylene composition, with an F greater than 25.0 cN 30 melt strength and a v greater than 205 mm / s 30 having a melt extensibility, where F 30 melt strength and v 30 melt extensibility are determined according to ISO 16790:2005, the total amount of high melt strength polypropylene (HMS-PP) is 40.0 to 89.95% by weight, preferably 57.5 to 84.95% by weight, more preferably 69.0 to 79.9% by weight.

[0147] In step a), the total amount of nucleating agent (NA) present in the above polypropylene composition is 0.05 to 10.0% by weight, preferably 1.0 to 8.0% by weight, more preferably 4.0 to 6.0% by weight, for example 5.0 to 6.0% by weight.

[0148] Furthermore, additive (A) as defined herein may optionally be present in step a).

[0149] The above method preferably further has the following step b) after step a): b) A step of forming a foamed article having a step of foaming the polypropylene composition obtained in step a), the above foamed article is preferably a foamed sheet.

[0150] More preferably, the above method further has the following step c) after step b): c) A step of forming a cup from the foamed article obtained after step b), preferably a foamed sheet.

[0151] Preferably, the recycled polypropylene (R-PP) polypropylene (L-PP) is recycled polypropylene (Rec-PP), and the above method further comprises the following step d) after step c) (if present) or step b): d) Forming recycled polypropylene (Rec-PP) using the remaining polymer present after step b).

[0152] Preferably, an extruder is used for the production of the above propylene composition, and more preferably, the extruder has, in the operating direction, a feed port (FT), a first mixing zone (MZ1), optionally a second mixing zone (MZ2), and a die (D). Preferably, the extruder is a screw extruder such as a twin-screw extruder. Accordingly, the high melt strength polypropylene (HMS-PP), the nucleating agent (NA), the recycled polypropylene (R-PP) and / or the linear polypropylene (L-PP), and optionally, an additive (A) different from the nucleating agent (NA) (if present) are fed into the extruder through the feed port (FT), preferably using a feeder at that time, and then sent to the downstream first mixing zone (MZ1). Preferably, the shear stress in the first mixing zone (MZ1) is such that the high melt strength polypropylene (HMS-PP) melts and the mixing with the nucleating agent (NA), the recycled polypropylene (R-PP) and / or the linear polypropylene (L-PP), and any optional additive (A) different from the nucleating agent (NA) (if present) is initiated.

[0153] After the first mixing zone (MZ1), the resulting product is sent to the downstream second mixing zone (MZ2) (if present). Finally, the polypropylene composition is discharged through the die (D).

[0154] If the second mixing zone is present, the first mixing zone (MZ1) is longer than the second mixing zone (MZ2). Preferably, the ratio of the length of the first mixing zone (MZ1) to the length of the second mixing zone (MZ2) [mm(MZ1) / mm(MZ2)] is in the range of at least 2 / 1, more preferably 3 / 1, even more preferably 2 / 1 to 15 / 1, and even more preferably 3 / 1 to 10 / 1.

[0155] It is also possible to use the same extruder for the production of high melting strength polypropylene (HMS-PP) and subsequent step a).

[0156] As outlined above, the method preferably further comprises the following step b) after step a): b) A step of forming a foamed article, comprising a step of foaming the polypropylene composition obtained in step a).

[0157] The foaming process is within the knowledge of those skilled in the art. In such a process, the melt of the polypropylene composition of the present invention having a gaseous or liquid foaming agent such as butane, a mixture of butane and propane, HFC or CO2 expands rapidly due to a pressure drop. Preferably, a liquid foaming agent such as butane or a mixture of butane and propane is used. A continuous foaming process as well as a discontinuous process may be applied. In the continuous foaming process, the polypropylene composition is melted in an extruder usually under a pressure exceeding 20 bar, then contains gas and is extruded through a die, where the pressure drop causes the formation of a foam. The mechanism of foaming of polypropylene in foam extrusion is described, for example, in H.E. Naguib, C.B. Park, N. Reichelt, Fundamental foaming mechanisms governing the volume expansion of extruded polypropylene foams, Journal of Applied Polymer Science, 91, 2661-2668 (2004). The process of foaming is outlined in S.T. Lee, Foam Extrusion, Technomic Publishing (2000). In the discontinuous foaming process, the polypropylene composition (micro) pellets are contained with a foaming agent under pressure, heated below the melting temperature, and then the pressure in the autoclave is rapidly relaxed. The dissolved foaming agent forms bubbles and produces a foamed structure. The production of discontinuous foamed beads is described, for example, in DE3539352.

[0158] The amount of the foaming agent is usually less than 10% by weight, preferably less than 5% by weight, based on the total weight of the polymer composition and the foaming agent.

[0159] Preferred foaming agents are butane and a mixture of butane and propane.

[0160] As outlined above, preferably a foamed sheet is formed. Methods for manufacturing foamed sheets are generally known in the art and are described in particular in TW M463649, which is hereby incorporated by reference in its entirety. Preferably, the methods and apparatuses described in TW M463649 are used for the production of the foamed sheets of the present invention.

[0161] Articles according to the present invention, for example containers such as bottles, cups, cans, canisters, bowls or trays; sleeves such as sleeves for containers; lids such as lids for containers; films; blanks; pads; carriers; tubes; substrates; pipes; vessels; panels such as structural panels; liners such as truck liners; taps; rolls or profiled containers, are manufactured using normal procedures in the art.

[0162] Use The present invention further relates to the use of the polypropylene composition of the present invention for the production of a foamed sheet satisfying the following relational expression (I): Flexural resistance (MD) / Flexural resistance (CD) ≤ 1.2 (I) (wherein, Flexural resistance (MD) is the flexural resistance (mN) in the machine direction measured according to SCAN P29:95; Flexural resistance (CD) is the flexural resistance (mN) in the cross direction measured according to SCAN P29:95.).

[0163] The present invention further relates to the use of the polypropylene composition of the present invention for the production of a foamed sheet satisfying the following relational expression (II): Thermal conductivity at 100°C / Thermal conductivity at 20°C ≤ 1.5 (II) (In the formula, the thermal conductivity at 100°C is the thermal conductivity (m·K) of the foamed sheet at 100°C determined according to ISO 1856:2000; the thermal conductivity at 20°C is the thermal conductivity (m·K) of the foamed sheet at 20°C determined according to ISO 1856:2000.).

[0164] Preferably, the present invention relates to the use of the polypropylene composition of the present invention for the production of a foamed sheet that satisfies the relational expressions (I) and (II) outlined above.

[0165] The preferred features of the above polypropylene composition, foamed sheet, article and method of the present invention are also the preferred features of the use of the present invention.

Examples

[0166] A. Measurement method Unless otherwise defined, the following definitions of terms and determination methods apply to the above general description of the present invention and the following examples.

[0167] MFR The MFR of polypropylene was determined according to ISO 1133 at a temperature of 230°C under a load of 2.16 kg.

[0168] Density of polymer The density was measured according to ISO 1183-1-Method A (2004). The sample was produced by compression molding according to ISO 1872-2:2007.

[0169] Comonomer content in polypropylene The comonomer content was determined quantitatively by a method well known in the art 13After basic assignments calibrated by 13C nuclear magnetic resonance (NMR) spectroscopy, it is determined by quantitative Fourier transform infrared spectroscopy (FTIR). The thin film is pressed to a thickness of 250 μm, and the spectrum is recorded in transmission mode.

[0170] Specifically, the ethylene content of the polypropylene-co-ethylene copolymer is determined using the baseline-corrected peak areas of the quantitative bands found at 720 - 722 and 730 - 733 cm -1 . The propylene-1-butene copolymer is evaluated at 767 cm -1 . Quantitative results are obtained based on reference to the film thickness.

[0171] Melting temperature (T m ) and heat of fusion (H f ), crystallization temperature (T c ) and heat of crystallization (H c ): Melting temperature T m and crystallization temperature T c were measured for 5 - 10 mg samples using a TA Instruments Q2000 differential scanning calorimeter (DSC) according to ISO 11357 / 3. The crystallization and melting temperatures were obtained in a heating / cooling / heating cycle at a scanning rate of 10 °C / min between 30 °C and 225 °C. The melting and crystallization temperatures were taken as the peaks of endotherm and exotherm in the cooling cycle and the second heating cycle, respectively.

[0172] MFR2 (230 °C) is measured according to ISO 1133 (230 °C, 2.16 kg load).

[0173] F 30 Melting strength and v 30 melt extensibility The tests described herein are in accordance with ISO 16790:2005. The strain hardening behavior is determined by the method described in the paper "Rheotens-Mastercurves and Drawability of Polymer Melts", M.H. Wagner, Polymer Engineering and Sience, Vol. 36, pages 925 - 935. The content of this document is incorporated by reference. The strain hardening behavior of the polymer is analyzed using a Rheotens apparatus (product of Goettfert, Siemensstr. 2, 74711 Buchen, Germany), i.e., by stretching the melt strand at a predefined acceleration to elongate it.

[0174] The Rheotens experiment mimics industrial spinning and extrusion processes. In principle, the melt is pressed or extruded through a round die, and the resulting strand is pulled. The stress of the extrudate is recorded as a function of the melt properties and measurement parameters (in particular, the ratio of the output to the draw speed, actually the measured value for the elongation rate). The results of extruding the material using an experimental extruder, a HAAKE Polylab system, and a gear pump equipped with a cylindrical die (L / D = 6.0 / 2.0 mm) are described below. The gear pump was pre - adjusted to a strand extrusion speed of 5 mm / s, and the melt temperature was set at 200 °C. The spinline length between the die and the Rheotens wheel was 80 mm. At the start of the experiment, the take - up speed of the Rheotens wheel was adjusted to the speed of the extruded polymer strand (tensile force 0). Then, the experiment was started by slowly increasing the take - up speed of the Rheotens wheel until the polymer filament broke. The acceleration of the wheel was small enough to measure the tensile force under nearly steady - state conditions. The acceleration of the melt strand drawing was 120 mm / sec 2 . Rheotens was operated in combination with the PC program EXTENS. This is a real - time data acquisition program that displays and saves the measured data of the tensile force and the draw speed. The endpoint (force vs. pulley rotation speed) of the Rheotens curve is taken as F 30 as the melt strength and extensibility value.

[0175] Gel content Weigh approximately 2 g of the polymer (m p ) and place it in a wire mesh that has been weighed (m p+m ). Extract the polymer in the wire mesh with boiling xylene in a Soxhlet apparatus for 5 hours. Then, replace the eluate with fresh xylene and continue boiling for another 1 hour. Subsequently, dry the wire mesh and weigh it again (m XHU+m ). Using the formula m XHU+m - m m = m XHU , determine the ratio of the amount of heat-insoluble xylene (m XHU ) obtained to the weight of the polymer (m p ) to obtain the xylene-insoluble content m XHU / m p .

[0176] Particle size / particle size distribution of the polymer A gradation test was performed on the polymer sample. For the gradation test, a column with a nested structure of sieves having wire mesh screens of the following sizes was used: >20 μm, >32 μm, >63 μm, >100 μm, >125 μm, >160 μm, >200 μm, >250 μm, >315 μm, >400 μm, >500 μm, >710 μm, >1 mm, >1.4 mm, >2 mm, >2.8 mm. The sample was poured onto the top sieve with the largest sieve size. Each of the lower sieves in the column has a smaller sieve size than the one above it (see the sizes above). There is a receiver at the bottom. The column was placed in a mechanical shaker. The column was vibrated by the shaker. After the vibration was completed, the substances on each sieve were weighed. Then, the weight of each sieve sample was divided by the total weight to obtain the percentage retained on each sieve.

[0177] Particle size of the nucleating agent Median particle size d 50It is calculated from the particle size distribution [mass percentage] determined by gravitational liquid sedimentation in accordance with ISO 13317-3 using a Sedigraph 5100 (Micromeritics Corporation).

[0178] Density of the foam Measured using an analytical and semi-micro precision balance, specific gravity balance (XS225A) from PRECISA Gravimetrics AG, Switzerland; Test method: Application of Archimedes, automatically calculate the density of the sample.

[0179] Cell size diameter of the foam The cell size diameter of the foam was determined using an optical microscope, CBS Stereoscopic microscope from Taiwan; The test methods used are as follows: 1. Cut strips of the foamed material along the cross direction (CD) and the machine direction (MD). 2. Hold the foamed material with a flat clamp and precisely shave it using a razor blade. 3. Focus the microscope at 100× and adjust the illumination on the foamed material. 4. Measure the length and width of each unique cell in the CD and MD directions and record the values. 5. Count the number of unique cells measured and record the value. 6. Measure the cell wall thickness intersecting 3 to 4 tangents to the total length of each unique cell in the CD and MD directions and record the values. 7. Starting from the lower part of the first measurement cell group, measure the total thickness of the 3 strips up to the middle part of the cell group and up to the upper part of the cell group. 8. Measure the total length from the lowermost complete cell to the uppermost complete cell. 9. Move the microscope field of view so that the lower part of the uppermost incomplete cell touches the lower part of the screen. 10. Repeat steps 4 to 9 for each new unique cell until about 0.200’’ to 0.800’’ of the strip is measured. Confirm that the overall lengths and cell compositions do not overlap. Each overall length measurement after the first measurement takes from the top of the previous top complete cell to the top of the current top complete cell.

[0180] Surface roughness of the foam Measured using a portable surface roughness measuring instrument, model SJ - 310, manufactured by Mitutoyo Corporation (Japan). The surface roughness measuring instrument (also called a surface profilometer) is a contact surface roughness measuring instrument. The measurement of roughness is fully automated and is performed by built - in software.

[0181] Flexural resistance The flexural resistance in the machine and cross directions was determined according to method SCAN P29:95 issued by the Scandinavian pulp, paper and board Testing committee.

[0182] Thermal conductivity The thermal conductivity of the foam sheet at 20 °C and 100 °C was determined according to ISO 1856:2000.

[0183] Inventive Example 1 (IE1) Manufacture of the foam sheet 1. Borealis AG's Daploy (trademark) WB140HMS (MFR2 (230 °C) of 2.1 g / 10 min measured according to ISO 1133; F of 36 cN determined according to ISO 16790:2005 30 Melt strength; v of 230 mm / s determined according to ISO 16790:2005 30 Melt extensibility) (HMS - PP), 750 kg; recycled polypropylene obtained by recycling the foam sheet manufactured in the previous manufacturing process carried out as the process of the present invention (MFR2 (230 °C) of 5.8 g / 10 min measured according to ISO 1133; F of 16.9 cN determined according to ISO 16790:2005 30Melt strength; v of 270 mm / s determined in accordance with ISO 16790:2005 30 Melt extensibility), 248 kg; and dry blend 2 kg of talc;

[0184] 2. Feed the blend obtained in the first step into a first single-screw extruder (screw diameter 90 mm; L / D ratio 26) from Pitac (Taiwan). Operate the extruder at a temperature of 200 °C (five heating zones: 150 °C; 200 °C; 200 °C; 200 °C; 200 °C) to melt the polymer;

[0185] 3. Inject 3 wt% of liquid butane (as a foaming agent) into the final section of the first single-screw extruder with respect to the total weight of the blend to obtain a molten blend;

[0186] 4. Pass the molten blend through a second single-screw extruder (screw diameter 120 mm; L / D ratio 34) from Pitac (Taiwan), and at the end of the second single-screw extruder, cool the molten blend to 160 °C;

[0187] 5. Pass the molten blend from step 4 through an extrusion die placed at the end of the second extruder; when exiting the extruder, the molten blend is exposed to a pressure drop to atmospheric pressure due to a rapid pressure drop, and the foaming agent in the molten blend expands, thereby causing foaming and generating a foamed structure; then, cool the foamed structure on a cooling drum at a temperature below 100 °C to obtain a foamed sheet having a density of 200 kg / m 3 and a thickness of 0.8 mm;

[0188] 6. Then, pass the foamed sheet and a 20-μm thick BOPP film through an in-line extrusion lamination unit from YC Group (Taiwan) to laminate the foamed sheet on the BOPP film to obtain a two-layer sheet.

[0189] Inventive Example 2 (IE2) The procedure of Invention Example 1 was repeated except that the thickness of the foamed sheet in step 5 was 1.0 mm.

[0190] Comparative Example 1 (CE1) Stora Enso's Cupforma Natura (trademark) PE (standard LDPE laminated carton cup).

[0191] The results of Invention Examples IE1 and IE2 and Comparative Example CE1 are shown in Table 1 below.

[0192] [Table 1]

[0193] As can be seen from the above, the composition of the present invention provides a foamed sheet having balanced flexural resistance in the machine direction and the cross direction, and since the blank can be used in all directions, the production of cups can be simplified. Furthermore, the above foamed sheet has excellent heat insulation properties that are not temperature-dependent.

[0194] After cutting, the manufactured sheet was used for cup production using a standard paper cup manufacturing machine (Eagle 1000S ACE Pack (Korea)), and heating element modification was performed to form the edges of the cups.

Claims

1. - 20.0 to 30.0 wt% of recycled polypropylene (R-PP); - 69.0 to 79.9% by weight of high melt strength polypropylene (HMS-PP) having an F greater than 25.0 cN and not more than 40.0 cN ３０ melt strength and a v of 225 to 260 mm / s ３０ and having a melt extensibility, with the F ３０ melt strength and the v ３０ melt extensibility determined according to ISO 16790:2005, high melt strength polypropylene (HMS-PP); and, - 0.05 to 6.0 wt% of a nucleating agent (NA); A polypropylene composition having: The recycled polypropylene (R-PP) has an F within the range of 1.0 cN or more and less than 20.0 cN, determined in accordance with ISO 16790:2005 ３０ melt strength, and a melt flow rate MFR (230 °C) within the range of 5 to 15 g / 10 min, measured in accordance with ISO 1133 ２ having; The nucleating agent (NA) is talc; The polypropylene composition.

2. The polypropylene composition according to claim 1, wherein the recycled polypropylene (R-PP) is recycled polypropylene (Rec-PP) having at least 50 wt% of recycled high melt strength polypropylene (HMS-PP).

3. A foamed sheet formed from the polypropylene composition according to claim 1 or 2.

4. The foamed sheet according to claim 3, having a thickness of 0.5 to 10 mm and / or a density of 150 to 250 kg / m ３ 3.

5. The foamed sheet according to claim 3 or 4, which is covered with a cover layer (CL).

6. The foamed sheet according to claim 5, wherein the foamed sheet and the cover layer (CL) are directly adjacent.

7. An article having the foamed sheet according to any one of claims 3 to 6.

8. A method having the following steps: a) - 20.0 to 30.0 wt% of recycled polypropylene (R-PP); - 69.0 to 79.9% by weight of high melt strength polypropylene (HMS-PP) having an F greater than 25.0 cN and not exceeding 40.0 cN ３０ melt strength and a v of 225 to 260 mm / s ３０ having a melt extensibility, and F ３０ melt strength and v ３０ high melt strength polypropylene (HMS-PP) in which the melt strength and the melt extensibility are determined according to ISO 16790:2005; and, - 0.05 to 6.0 wt% of talc; A polypropylene composition having: A polypropylene composition having a melt strength F within the range of 1.0 cN or more and less than 20.0 cN determined according to ISO 16790:2005 ３０ and a melt flow rate MFR (at 230 °C) within the range of 5 to 15 g / 10 min measured according to ISO 1133 ２ which is a step of producing a polypropylene composition having A step of simultaneously or sequentially mixing recycled polypropylene (R-PP), high melt strength polypropylene (HMS-PP) and talc in a mixing device.

9. The method according to claim 8, further having the following step b) after step a): b) A step of forming a foamed article, which has a step of foaming the polypropylene composition obtained in step a).

10. The method according to claim 9, further having the following step c) after step b): c) A step of forming a cup from the foamed article obtained after step b).

11. The recycled polypropylene (R-PP) is recycled polypropylene (Rec-PP) having at least 50 wt% of recycled high melt strength polypropylene (HMS-PP); after step b), or, if step c) exists, after step c), further having the following step d): The method according to claim 9 or 10: d) A step of forming recycled polypropylene (Rec-PP) using the remaining polymer present after step b).

12. Use of the polypropylene composition according to claim 1 or 2 for the production of a foamed sheet satisfying the following relational expression (I): Flexural resistance (MD) / Flexural resistance (CD) ≤ 1.2 (I) (wherein, The flex resistance (MD) is the flex resistance (mN) in the machine direction measured according to SCAN P29:95; The flex resistance (CD) is the flex resistance (mN) in the cross direction measured according to SCAN P29:

95. **Claim 13** Use of the polypropylene composition according to claim 1 or 2 for the production of a foamed sheet satisfying the following relational expression (II): Thermal conductivity at 100°C / Thermal conductivity at 20°C ≤ 1.5 (II) (wherein, The thermal conductivity at 100°C is the thermal conductivity (m·K) of the foamed sheet at 100°C determined according to ISO 1856:2000; The thermal conductivity at 20°C is the thermal conductivity (m·K) of the foamed sheet at 20°C determined according to ISO 1856:2000).

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