Polypropylene composition for HMS-PP foamed sheets with balanced bending resistance

Abstract

This invention relates to a polypropylene composition comprising: - 10-50 wt% recycled polypropylene (R-PP) and / or linear polypropylene (L-PP); - 40-89.95 wt% high melt strength polypropylene (HMS-PP), wherein F 30 Melt strength greater than 25.0 cN, v 30 Melt elongation greater than 205 mm / s, where F 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005; and -0.05~10wt% nucleating agent (NA). This invention relates to a foamed board made from the polypropylene composition; an article comprising the foamed board; and a method comprising the steps of forming the polypropylene composition. Furthermore, this invention also relates to the use of the polypropylene composition for forming foamed boards.

Description

[0001] This application is a divisional application of the invention patent application filed on June 24, 2021, with application number 202180043779.3 (international application number PCT / EP2021 / 067321) entitled "Polypropylene composition for HMS-PP foamed board with balanced flexural strength". Technical Field

[0002] This invention relates to a polypropylene composition suitable for use in foamed boards, foamed boards made from the composition, and products made from the foamed boards. The invention also relates to a method for preparing the polypropylene composition and its use. Background Technology

[0003] Currently, LDPE-coated paper boxes and expanded polystyrene (PS) foam are the main materials for disposable hot and cold beverage cups. Due to health concerns and the negative environmental impact of PS foam cups, many countries and / or regions have banned or are about to ban polystyrene cups. Therefore, polyethylene-coated paper boxes are becoming increasingly popular and are replacing PS in the hot and cold beverage cup market. However, due to the LDPE coating, paper cups cannot be composted, and recycling is difficult due to the complex and expensive process of separating the pulp and PE coating. Therefore, from a recyclability and environmental friendliness perspective, paper cups are not an ideal solution.

[0004] Therefore, the only feasible methods for disposing of paper cups are either incineration for energy recovery or disposal in landfills. Besides the environmental issues associated with paper cups, another challenge lies in the uneven distribution of properties in the paper sheets used for cup production, particularly the differences in flexural strength in the machine direction and transverse direction. In addition to the aforementioned problems, another challenge is that paper cups need excellent thermal insulation properties, especially for hot beverage cups at high temperatures. Therefore, recent development goals include developing a disposable, recyclable material, particularly suitable for disposable hot and cold beverage cups, to overcome these issues. Summary of the Invention

[0005] Therefore, the present invention provides a polypropylene composition comprising:

[0006] - 10.0~50.0wt% recycled polypropylene (R-PP) and / or linear polypropylene (L-PP).

[0007] - 40.0~89.95wt% high melt strength polypropylene (HMS-PP), its F 30 Melt strength greater than 25.0 cN, v 30 Melt elongation greater than 205 mm / s, where F 30 Melt strength and v 30Melt elongation was determined according to ISO 16790:2005; and

[0008] - 0.05~10.0wt% nucleating agent (NA).

[0009] Surprisingly, the polypropylene composition according to the invention exhibits high flexural strength in both the machine direction and transverse direction when formed into foam. Furthermore, unlike LDPE coated paperboard, its thermal conductivity does not increase with increasing temperature. Therefore, the polypropylene composition according to the invention is particularly suitable for making cups.

[0010] The linear polypropylene according to the present invention does not include side chains. Detailed Implementation

[0011] High melt strength polypropylene (HMS-PP)

[0012] High melt strength polypropylene (HMS-PP) is branched, and therefore differs from linear polypropylene because the backbone of polypropylene includes side chains, while unbranched polypropylene (i.e., linear polypropylene) does not. Side chains have a significant impact on the rheological properties of polypropylene. Therefore, linear polypropylene and high melt strength polypropylene can be clearly distinguished by their flow behavior under pressure.

[0013] Branching can typically be achieved by using a specific catalyst (i.e., a specific unit-point catalyst) or by chemical modification. For the preparation of branched polypropylene using a specific catalyst, please refer to EP 1892264. For the preparation of branched polypropylene by chemical modification, please refer to EP 0879830A1. In this case, the branched polypropylene is also referred to as high melt strength polypropylene. The high melt strength polypropylene (HMS-PP) according to the present invention is obtained by chemically modifying polypropylene (PP), as detailed below. HMS-PP is available from Borealis AG under the trade name Daploy. TM .

[0014] Therefore, high melt strength polypropylene (HMS-PP) has an F value greater than 25.0 cN. 30 Melt strength and v greater than 205 mm / s 30 The melt elongation is preferably greater than 25.0~50.0 cN. 30 Melt strength and v = 205~300 mm / s 30 Melt elongation is used to provide polypropylene compositions with good shear-thinning properties. F 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005.

[0015] In a preferred embodiment, high melt strength polypropylene (HMS-PP) has the following characteristics:

[0016] (a) F 30 The melt strength is greater than 25.0~45.0 cN, preferably greater than 25.0~42.0 cN, and most preferably greater than 25.0~40.0 cN; and

[0017] (b)v 30 The melt elongation is 210~300mm / s, more preferably 215~290mm / s, even more preferably 220~270mm / s, and most preferably 225~260mm / s.

[0018] In a particularly preferred embodiment, the F of high melt strength polypropylene (HMS-PP) 30 Melt strength is greater than 25.0~45.0 cN, v 30 Melt elongation is 210~300 mm / s, such as F 30 The melt strength is greater than 25.0~42.0 cN and v. 30 Melt elongation is 215~290 mm / s, or F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 Melt elongation is 220~270 mm / s, or F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 The melt elongation is 225~260 mm / s.

[0019] Furthermore, preferably, the melt flow rate MFR2 (230°C) of the high melt strength polypropylene (HMS-PP) is determined according to ISO 1133 to be no more than 15.0 g / 10 min, more preferably in the range of 0.5 to 15.0 g / 10 min, but even more preferably in the range of 1.0 to 15.0 g / 10 min, such as 1.5 to 15.0 g / 10 min.

[0020] In a particularly preferred embodiment, the melt flow rate MFR2 (230°C) of the high melt strength polypropylene (HMS-PP) is determined according to ISO 1133 to be no more than 7.0 g / 10 min, preferably 0.5 to 7.0 g / 10 min, more preferably 0.5 to 6.5 g / 10 min, even more preferably 0.5 to 6.0 g / 10 min, but more preferably 1.0 to 6.0 g / 10 min, such as 1.5 to 5.0 g / 10 min.

[0021] Therefore, in one specific embodiment, high melt strength polypropylene (HMS-PP) has the following characteristics:

[0022] (a) The melt flow rate MFR2 (230°C) is not more than 15.0 g / 10 min, more preferably 0.5 to 15.0 g / 10 min, but even more preferably 1.0 to 15.0 g / 10 min, for example 1.5 to 15.0 g / 10 min; and

[0023] (b) F 30 The melt strength is greater than 25.0 cN, preferably greater than 25.0~50.0 cN, more preferably greater than 25.0~45.0 cN, even more preferably greater than 25.0~42.0 cN, and most preferably greater than 25.0~40.0 cN; and

[0024] (c)v 30 The melt elongation is greater than 205 mm / s, preferably 205~300 mm / s, more preferably 210~300 mm / s, even more preferably 215~290 mm / s, even more preferably 220~270 mm / s, and most preferably 225~260 mm / s.

[0025] In a particularly preferred embodiment, high melt strength polypropylene (HMS-PP) has:

[0026] (a) The melt flow rate MFR2 (230°C) is not greater than 7.0 g / 10 min, preferably 0.5 to 7.0 g / 10 min, more preferably 0.5 to 6.5 g / 10 min, and even more preferably 0.5 to 6.0 g / 10 min, but more preferably 1.0 to 6.0 g / 10 min, such as 1.5 to 5.0 g / 10 min; and

[0027] (b) F 30 The melt strength is greater than 25.0 cN, preferably greater than 25.0~50.0 cN, more preferably greater than 25.0~45.0 cN, even more preferably greater than 25.0~42.0 cN, and most preferably greater than 25.0~40.0 cN; and

[0028] (c)v 30 The melt elongation is greater than 205 mm / s, preferably greater than 205~300 mm / s, more preferably 210~300 mm / s, even more preferably 215~290 mm / s, also more preferably 220~270 mm / s, and most preferably 225~260 mm / s.

[0029] Therefore, in a specific implementation, the melt flow rate MFR2 (230°C) of high melt strength polypropylene (HMS-PP) is 0.5~15.0 g / 10 min, F 30 The melt strength is greater than 25.0~45.0 cN and v. 30Melt elongation is 210~300 mm / s, and the melt flow rate MFR2 (230℃) is 1.0~15.0 g / 10 min, F 30 The melt strength is greater than 25.0~42.0 cN and v. 30 Melt elongation is 215~290 mm / s, or melt flow rate MFR2 (230°C) is 1.0~15.0 g / 10 min, F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 Melt elongation is 220~270 mm / s, or melt flow rate MFR2 (230℃) is 1.5~15.0 g / 10 min, F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 The melt elongation is 225~260 mm / s.

[0030] Therefore, in another specific embodiment, the melt flow rate MFR2 (230°C) of high melt strength polypropylene (HMS-PP) is 0.5~7.0 g / 10 min, F 30 Melt strength greater than 25.0~45.0 cN and v 30 Melt elongation is 210~300 mm / s, and the melt flow rate MFR2 (230℃) is 1.0~15.0 g / 10 min, F 30 The melt strength is greater than 25.0~42.0 cN and v. 30 Melt elongation is 215~290 mm / s, or melt flow rate MFR2 (230℃) is 1.0~6.0 g / 10 min, F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 Melt elongation is 220~270 mm / s, or melt flow rate MFR2 (230℃) is 1.5~5.0 g / 10 min, F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 The melt elongation is 225~260 mm / s.

[0031] 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. The crystallization temperature is preferably at least 110°C, more preferably at least 120°C.

[0032] In addition, high melt strength polypropylene (HMS-PP) can be high melt strength random propylene copolymer (R-HMS-PP) or high melt strength propylene homopolymer (H-HMS-PP), with the latter being preferred.

[0033] In this invention, the term "propylene homopolymer" refers to polypropylene that is substantially composed of propylene units, i.e., composed 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 detected in the propylene homopolymer.

[0034] In the case of high melt strength polypropylene (HMS-PP) being a high melt strength random propylene copolymer (R-HMS-PP), it contains monomers that can be copolymerized with propylene, such as comonomers like ethylene and / or C4~C4. 12 α-olefins, especially ethylene and / or C4~C 10 α-Olefins, such as 1-butene and / or 1-hexene. Preferably, the high melt strength random propylene copolymer (R-HMS-PP) comprises monomers copolymerizable with propylene (selected from ethylene, 1-butene, and 1-hexene), particularly composed of monomers copolymerizable with propylene (selected from ethylene, 1-butene, and 1-hexene). More specifically, the high melt strength random propylene copolymer (R-HMS-PP) comprises units derived from ethylene and / or 1-butene (in addition to 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 0.2 to 10.0 mol%, more preferably 0.5 to 7.0 mol%.

[0035] In this regard, it should be mentioned that high melt strength polypropylene (HMS-PP), which is a high melt strength homopolymer of propylene (H-HMS-PP) or a high melt strength random propylene copolymer (R-HMS-PP), may contain additional unsaturated monomers that are different from the comonomers defined for high melt strength random propylene copolymers (R-HMS-PP). In other words, high melt strength propylene homopolymers (H-HMS-PP) or high melt strength random propylene copolymers (R-HMS-PP) may contain unsaturated units, such as bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers as defined in detail below, which are different from propylene, ethylene, and other C4-C polymers. 12 α-Olefins. Therefore, the definition of homopolymers and copolymers of high melt strength polypropylene (HMS-PP) actually refers to unmodified polypropylene, i.e., polypropylene (PP), preferably linear polypropylene (l-PP), which is used to obtain high melt strength polypropylene (HMS-PP) through chemical modification (defined in detail below).

[0036] Therefore, in a preferred embodiment, the high melt strength polypropylene (HMS-PP) comprises:

[0037] (a) Units derived from (i) and (ii) below (if it is a high melt strength propylene homopolymer (H-HMS-PP)):

[0038] (i) Propylene, and

[0039] (ii) Bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers,

[0040] or

[0041] (b) Units derived from (i) and (ii) below (if they are high melt strength random propylene copolymers (R-HMS-PP)):

[0042] (i) Propylene

[0043] (ii) Ethylene and / or C4-C 12 α-olefins, such as 1-butene and / or 1-hexene, preferably ethylene, and

[0044] (iii) Bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers.

[0045] The terms "bifunctionally unsaturated" or "multifunctionally unsaturated" as used above refer to the preferred presence of two or more non-aromatic double bonds, such as in divinylbenzene, cyclopentadiene, or polybutadiene. Only with such bifunctional or multifunctional unsaturated compounds can polymerization preferably be carried out with the assistance of free radicals (see below). The unsaturated sites in bifunctional or multifunctional unsaturated compounds are not actually "unsaturated" in their chemical bonding state because each double bond is used as a covalent bond in the polymer chain of unmodified polypropylene (i.e., polypropylene (PP), preferably linear polypropylene (l-PP)).

[0046] The reaction of one and / or more unsaturated monomers with unmodified polypropylene (i.e., polypropylene (PP), preferably linear polypropylene (l-PP)) to synthesize bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers (preferably having a number average molecular weight (Mn) ≤ 10000 g / mol) is carried out in the presence of a thermal free radical forming agent (e.g., a decomposition free radical forming agent, such as a thermally decomposable peroxide).

[0047] Bifunctional unsaturated monomers can be:

[0048] - Divinyl compounds, such as divinylaniline, m-divinylbenzene, p-divinylbenzene, divinylpentane, and divinylpropane;

[0049] - Allyl compounds, such as allyl acrylate, allyl methacrylate, allyl methyl maleate and allyl vinyl ether;

[0050] - Dienes, such as 1,3-butadiene, chlorobutene, cyclohexadiene, cyclopentadiene, 2,3-dimethylbutadiene, heptaadiene, hexadiene, isoprene and 1,4-pentadiene;

[0051] - A mixture of aromatic and / or aliphatic bis(maleimide) bis(limonimide) and these unsaturated monomers.

[0052] The particularly preferred bifunctional unsaturated monomers are 1,3-butadiene, isoprene, dimethylbutadiene, and divinylbenzene.

[0053] Multifunctional unsaturated low molecular weight polymers (preferably having a number average molecular weight (Mn) ≤ 10000 g / mol) can be synthesized from one or more unsaturated monomers.

[0054] An example of such a low molecular weight polymer is:

[0055] - Polybutadiene, especially polybutadiene in which different microstructures on the polymer chain (such as 1,4-cis, 1,4-trans and 1,2-(vinyl)) are mainly 1,2-(vinyl) configuration;

[0056] - A copolymer of butadiene and styrene, with 1,2-(vinyl) on its polymer chain.

[0057] The preferred low molecular weight polymer is polybutadiene, especially polybutadiene with a 1,2-(vinyl) configuration containing more than 50.0 wt%.

[0058] High melt strength polypropylene (HMS-PP) may contain more than one bifunctional unsaturated monomer and / or multifunctional unsaturated low molecular weight polymer. Even more preferably, in high melt strength polypropylene (HMS-PP), the total content of bifunctional unsaturated monomer and multifunctional unsaturated low molecular weight polymer is 0.01 to 10.0 wt%.

[0059] In a preferred embodiment, the high melt strength polypropylene (HMS-PP) is free of additive (A). Therefore, in the case where the polypropylene composition of the present invention contains additive (A), these additives (A) are not introduced into the polypropylene composition during the manufacture of the high melt strength polypropylene (HMS-PP).

[0060] Further preferred high melt strength polypropylene (HMS-PP) has a low gel content, typically less than 1.00 wt%, preferably less than 0.80 wt%, and more preferably less than 0.50 wt%.

[0061] As described above, high melt strength polypropylene (HMS-PP) can be obtained by treating polypropylene (PP) (preferably linear polypropylene (l-PP)) with a thermally decomposable radical forming agent. However, in this case, there is a high risk that the polypropylene (PP) (preferably linear polypropylene (l-PP)) will degrade, which is harmful. Therefore, it is preferable to chemically modify the polypropylene (PP) by additionally using bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers as chemically bonded bridging units. A suitable method for obtaining high melt strength polypropylene (HMS-PP) has been disclosed, for example, by EP 0787750, EP 0879830A1 and EP 0890612A2. All documents are incorporated herein by reference. Therefore, the amount of thermally decomposable radical forming agent (preferably peroxide) is preferably in the range of 0.05 to 3.00 wt%, based on the amount of polypropylene (PP). Typically, the thermally decomposable radical forming agent and the bifunctional unsaturated monomer and / or multifunctional unsaturated low molecular weight polymer are added together to the polypropylene (PP) (preferably linear polypropylene (l-PP)). However, it is also possible, though not preferred, to first add bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers to polypropylene (PP) (preferably linear polypropylene (l-PP)) and then add a thermal decomposition radical forming agent to the polypropylene (PP), or conversely, to first add a thermal decomposition radical forming agent to polypropylene (PP) (preferably linear polypropylene (l-PP)) and then add bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers.

[0062] For information on bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers used in the manufacture of high melt strength polypropylene (HMS-PP), please refer to the sections above.

[0063] As described above, it is preferable to use bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers in the presence of thermally decomposable free radical forming agents.

[0064] Peroxides are preferred thermally decomposable free radical forming agents. More preferred thermally decomposable free radical forming agents are selected from combinations of acyl peroxides, alkyl peroxides, hydrogen peroxide, peresters, and peroxycarbonates.

[0065] The following peroxides are particularly preferred:

[0066] Acyl peroxides: benzoyl peroxide, 4-chlorobenzoyl peroxide, 3-methoxybenzoyl peroxide and / or methylbenzoyl peroxide.

[0067] Alkyl peroxides: allyl tert-butyl peroxide, 2,2-bis(tert-butylperoxide butane), 1,1-bis(tert-butylperoxide)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxide)valerate, diisopropylaminomethyltert-pentyl peroxide, dimethylaminomethyltert-pentyl peroxide, diethylaminomethyltert-butyl peroxide, dimethylaminomethyltert-butyl peroxide, 1,1-di-(tert-pentylperoxide)cyclohexane, tert-pentyl peroxide, tert-butylcumyl peroxide, tert-butyl peroxide and / or 1-hydroxybutyl-n-butyl peroxide.

[0068] Peresters and peroxycarbonates: Butyl peracetate, Cucurbityl peracetate, Cucurbityl perpropionate, Cyclohexyl peracetate, Di-tert-butyl perhexanoate, Di-tert-butyl pernonanoate, Di-tert-butyl perglutarate, Di-tert-butyl persediate, Di-tert-butyl persediate, Nitrocumyl perpropionate, Phenylacetyl perbenzoate, Nitro-Phenylacetyl perbenzoate, Tert-butylbicyclo-(2,2,l)heptane percarboxylate, Tert-butyl-4-methyl perbutyrate, Tert-butylcyclobutane percarboxylate, Tert-butylcyclohexyl peroxycarboxylate, Tert-butylcyclopentyl percarboxylate, Tert-butylcyclopropyl percarboxylate, Tert-butyl dimethyl percinnamate, 2-(2,2-stilbeneyl)tert-butyl perbenzoate, 4-methoxytert-butyl perbenzoate, etc. tert-butyl benzoate, tert-butylcarboxycyclohexane, tert-butyl pernaphthalate, tert-butyl peroxyisopropylcarbonate, tert-butyl pertoluate, 1-phenylcyclopropylpercarboxylate, t-butyl-2-propylperpentene-2-oate, 1-methylcyclopropylpercarboxylate, tert-butyl 4-nitrophenylperacetic acid, tert-butyl-N-succinimide percarboxylate, tert-butyl percrotonate, tert-butyl permaleate, tert-butyl permethacrylate, tert-butyl peroctanoate, tert-butyl perisopropylcarbonate, tert-butyl perisobutyrate, tert-butyl peracrylate, and / or tert-butyl perpropionate.

[0069] A mixture of these free radical forming agents was further envisioned.

[0070] The suitable HMS-PP is WB140HMS™, commercially available from Borealis AG.

[0071] Polypropylene (PP)

[0072] As previously mentioned, high melt strength polypropylene (HMS-PP) is a modified polypropylene prepared by reacting polypropylene (PP) with a thermally decomposable free radical forming agent, and optionally combining it with bifunctional unsaturated monomers and / or multifunctional unsaturated low molecular weight polymers. The polypropylene (PP) is preferably linear polypropylene (l-PP).

[0073] Preferably, the melt flow rate MFR2 (230°C) of polypropylene (PP) (preferably linear polypropylene (l-PP)) as determined according to ISO 1133 is 0.1~45.0 g / 10 min, such as 0.1~40.0 g / 10 min or 0.1~35.0 g / 10 min, more preferably 0.1~30.0 g / 10 min, even more preferably 0.1~28.0 g / 10 min, and even more preferably 0.1~25.0 g / 10 min.

[0074] High melt strength polypropylene (HMS-PP) differs from the polypropylene (PP) used to manufacture it in that the backbone of HMS-PP includes side chains, while the starting product (i.e., polypropylene (PP), including preferably linear polypropylene (l-PP)) does not contain or nearly does not contain side chains. Side chains have a significant impact on the rheological properties of polypropylene. Therefore, the starting product (i.e., polypropylene (PP)) and the resulting high melt strength polypropylene (HMS-PP) can be clearly distinguished by their flow behavior under stress.

[0075] Furthermore, as mentioned above, the polypropylene (PP) is preferably linear polypropylene (l-PP). The same consideration applies to the polypropylene (PP') discussed in detail below, which in a preferred embodiment is also linear polypropylene (l-PP'). Therefore, in this invention, the term "linear polypropylene" means that the linear polypropylene does not show or approximately does not show a branched structure. Due to the lack of branching, the linear polypropylene, i.e., the linear polypropylene (l-PP) and linear polypropylene (l-PP'), preferably has a low vt 30 Melt elongation and / or low F 30 Characteristics of melt strength.

[0076] Therefore, preferably, linear polypropylene (l-PP) has the following characteristics:

[0077] (a) F 30 The melt strength is less than 30.0 cN, preferably less than 27.0 cN, more preferably 1.0 to less than 30.0 cN, also more preferably 1.5 to less than 30.0 cN, but more preferably 2.0 to less than 27.0 cN, and even more preferably 2.5 to less than 27.0 cN; and

[0078] (b)v30 The melt elongation is less than 220 mm / s, preferably less than 210 mm / s, more preferably 80~200 mm / s, and most preferably 100~200 mm / s.

[0079] In other words, linear polypropylene (l-PP) with an FN of less than 30.0 cN is preferred. 30 Melt strength and v less than 220 mm / s 30 The melt elongation is preferably less than 27.0 cN for F. 30 Melt strength and v less than 210 mm / s 30 Melt elongation, more preferably F 30 Melt strength is 1.0 to less than 30.0 cN and v 30 The melt elongation is 80~200 mm / s, but F is preferred. 30 Melt strength is 1.5 to less than 30.0 cN and v 30 Melt elongation of 100~200 mm / s, and more preferably F 30 Melt strength is 2.0 to less than 27.0 cN and v 30 Melt elongation is 100~200 mm / s, such as F 30 The melt strength is 2.5 to less than 27.0 cN.

[0080] Therefore, in one specific embodiment, linear polypropylene (l-PP) has:

[0081] (a) The melt flow rate MFR2 (230°C) as determined according to ISO 1133 is 0.1~45.0 g / 10 min, such as 0.1~40.0 g / 10 min or 0.1~35.0 g / 10 min, more preferably 0.1~30.0 g / 10 min, even more preferably 0.1~28.0 g / 10 min, but more preferably 0.1~25.0 g / 10 min; and

[0082] (b) F 30 The melt strength is less than 30.0 cN, preferably less than 27.0 cN, more preferably 1.0 to less than 30.0 cN, also more preferably 1.5 to less than 30.0 cN, but more preferably 2.0 to less than 27.0 cN, and even more preferably 2.5 to less than 27.0 cN; and

[0083] (c)v 30 The melt elongation is less than 220 mm / s, preferably less than 210 mm / s, more preferably 80~200 mm / s, and most preferably 100~200 mm / s.

[0084] Therefore, in one specific embodiment, the polypropylene (PP) is linear polypropylene (l-PP) with a melt flow rate MFR2 (230°C) of 0.1~45.0 g / 10 min, F 30 Melt strength less than 30.0 cN and v 30 The melt elongation is less than 220 mm / s, and the preferred melt flow rate MFR2 (230°C) is 0.1~40.0 g / 10 min. 30 Melt strength less than 30.0 cN and v 30 The melt elongation is less than 210 mm / s, and more preferably the melt flow rate MFR2 (230°C) is 0.1~35.0 g / 10 min. 30 Melt strength is 1.0 to less than 30.0 cN and v 30 The melt elongation is 80~200 mm / s, but a more preferred melt flow rate MFR2 (230°C) is 0.1~30.0 g / 10 min. 30 Melt strength is 1.5 to less than 30.0 cN and v 30 The melt elongation is 100~200 mm / s, but a melt flow rate MFR2 (230°C) of 0.1~28.0 g / 10 min is also preferred. 30 Melt strength is 2.0 to less than 27.0 cN and v 30 Melt elongation is 100~200 mm / s, and if the melt flow rate MFR2 (230°C) is 0.1~25.0 g / 10 min, F 30 Melt strength is 2.5 to less than 27.0 cN and v 30 The melt elongation is 100~200 mm / s.

[0085] Preferably, the melting point of polypropylene (PP) (preferably linear polypropylene (l-PP)) is at least 140°C, more preferably at least 150°C, and even more preferably at least 158°C.

[0086] Polypropylene (PP), preferably linear polypropylene (1-PP), can be produced in known ways, for example by using a unit point catalyst or a Ziegler-Natta catalyst. Polypropylene (PP), preferably linear polypropylene (1-PP), can be a propylene homopolymer (H-PP), preferably a linear propylene homopolymer (1-H-PP), or a propylene copolymer (R-PP), preferably a linear propylene copolymer (1-R-PP). The content and type of comonomers are referenced above for the information provided regarding high melt strength random propylene copolymers (R-HMS-PP). Preferably, the polypropylene (PP) is linear polypropylene (1-PP). More preferably, the polypropylene (PP) is a linear propylene homopolymer (1-H-PP). Therefore, respectively, all information regarding melt flow rate MFR2 (230°C), melting point, and F... 30 Melt strength, v 30 Information on melt elongation, particle size, and particle size distribution is particularly applicable to linear propylene homopolymers (1-H-PP).

[0087] In a preferred embodiment, the polypropylene (PP), preferably linear polypropylene (l-PP), is free of additive (A). Therefore, in the case where the polypropylene composition of the present invention contains additive (A), these additives (A) are not introduced into the polypropylene composition during the manufacture of high melt strength polypropylene (HMS-PP).

[0088] Recycled polypropylene (R-PP) and / or linear polypropylene (L-PP)

[0089] It is understood that the polypropylene composition comprises recycled polypropylene (R-PP) and / or linear polypropylene (L-PP). That is, the polypropylene composition may comprise a mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP). Alternatively, the polypropylene composition comprises either recycled polypropylene (R-PP) or linear polypropylene (L-PP).

[0090] Preferably, the polypropylene composition comprises recycled polypropylene (R-PP) and linear polypropylene (L-PP), i.e., a mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP).

[0091] Recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) preferably have at least one of the following properties:

[0092] a) The MFR, determined according to ISO 1133 at 230°C and with a load of 2.16 kg, is 3~25 g / 10 min;

[0093] b) F measured according to ISO 16790:2005 30 Melt strength is less than 25.0 cN.

[0094] In one embodiment, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) have an F content determined according to ISO 16790:2005 at least. 30 The melt strength is less than 25.0 cN, or the MFR is 3~25 g / 10 min as determined according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg. Alternatively, the MFR of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) is at least 3~25 g / 10 min as determined according to ISO 16790:2005. 30 The melt strength is less than 25.0 cN, or the MFR is 3~25 g / 10 min as determined according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg.

[0095] Preferably, the melt flow rate MFR2 (230°C) of the recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) as determined according to ISO 1133 is 4~20 g / 10 min, more preferably 5~15 g / 10 min.

[0096] Preferably, the recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) have an F content determined according to ISO 16790:2005. 30 The melt strength is preferably less than 20.0 cN, more preferably 1.0 to less than 20.0 cN.

[0097] For example, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) preferably have an FN of less than 20.0 cN as determined according to ISO 16790:2005. 30 Melt strength and melt flow rate MFR2 (230°C) of 4 to 20 g / 10 min as determined according to ISO 1133, more preferably having an IF of 1.0 to less than 20.0 cN as determined according to ISO 16790:2005. 30 Melt strength and melt flow rate MFR2 (230°C) of 5-15 g / 10 min as determined according to ISO 1133.

[0098] For example, recycled polypropylene (R-PP) has at least one of the following properties:

[0099] a) The MFR, determined according to ISO 1133 at 230°C and with a load of 2.16 kg, is 3~25 g / 10 min;

[0100] b) F measured according to ISO 16790:2005 30 Melt strength less than 25.0 cN;

[0101] c) v as determined according to ISO 16790:2005 30 Melt elongation greater than 200 mm / s.

[0102] For example, recycled polypropylene (R-PP) has an FN of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and / or v greater than 200 mm / s as determined according to ISO 16790:2005 30 More preferably, the melt elongation of recycled polypropylene (R-PP) is at least less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and v greater than 200 mm / s as determined according to ISO 16790:2005 30 Melt elongation, and even more preferably, recycled polypropylene (R-PP) has an FN 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 Melt elongation, and 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.

[0103] Preferably, the recycled polypropylene (R-PP) has a v content determined according to ISO 16790:2005. 30 The melt elongation is greater than 205 mm / s, more preferably greater than 205~290 mm / s.

[0104] In one embodiment, the recycled polypropylene (R-PP) has an FN of less than 20.0 cN as determined according to ISO 16790:2005. 30 Melt strength, v = greater than 205 mm / s as determined according to ISO 16790:2005 30 Melt elongation and melt flow rate MFR2 (230°C) of 4~20 g / 10 min as determined according to ISO 1133, more preferably, F as determined according to ISO 16790:2005. 30 Melt strength is 1.0 to less than 20.0 cN, and v is measured according to ISO 16790:2005. 30 The melt elongation is greater than 205~290 mm / s and the melt flow rate MFR2 (230℃) as determined according to ISO 1133 is 5~15 g / 10 min.

[0105] Optionally, linear polypropylene (L-PP) has at least one of the following properties:

[0106] a) The MFR, determined according to ISO 1133 at 230°C and with a load of 2.16 kg, is 3~25 g / 10 min;

[0107] b) The melt strength of F30, as determined by ISO 16790:2005, is less than 25.0 cN.

[0108] c) The melt elongation of v30, as determined by ISO 16790:2005, is less than 200 mm / s.

[0109] In one embodiment, the linear polypropylene (L-PP) has an FN of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and / or v less than 200 mm / s as determined according to ISO 16790:2005 30 More preferably, the melt elongation of linear polypropylene (L-PP) is at least less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and vs less than 200 mm / s as determined according to ISO 16790:2005 30 Melt elongation, and even more preferably, linear polypropylene (L-PP) has an FN of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength, vs less than 200 mm / s as determined according to ISO 16790:2005 30 Melt elongation, and the 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.

[0110] Preferably, linear polypropylene (L-PP) has a v content determined according to ISO 16790:2005. 30 The melt elongation is less than 190 mm / s, more preferably 100 to less than 190 mm / s, and most preferably 120 to 190 mm / s.

[0111] For example, linear polypropylene (L-PP) has an FN of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength, vs less than 190 mm / s as determined according to ISO 16790:2005. 30 Melt elongation, and an MFR of 3–25 g / 10 min as determined according to ISO 1133 at 230°C and a load of 2.16 kg. Preferably, the linear polypropylene (L-PP) has an FFR of at least less than 25.0 cN as determined according to ISO 16790:2005. 30Melt strength, measured according to ISO 16790:2005, 100 to less than 190 mm / s (v0). 30 Melt elongation, and an MFR of 3–25 g / 10 min as determined according to ISO 1133 at 230°C and a load of 2.16 kg. More preferably, the linear polypropylene (L-PP) has an FFR of at least less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength, measured according to ISO 16790:2005, is 120 to less than 190 mm / s. 30 Melt elongation, and 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.

[0112] In one embodiment, the linear polypropylene (L-PP) has an FN of less than 20.0 cN as determined according to ISO 16790:2005. 30 Melt strength, measured according to ISO 16790:2005, 100 to less than 190 mm / s (v0). 30 Melt elongation, and melt flow rate MFR2 (230°C) of 4–20 g / 10 min as determined according to ISO 1133, more preferably, F as determined according to ISO 16790:2005. 30 Melt strength is between 1.0 and less than 20.0 cN, and v is measured according to ISO 16790:2005. 30 The melt elongation is 120 to less than 190 mm / s, and the melt flow rate MFR2 (230°C) as determined according to ISO 1133 is 5 to 15 g / 10 min.

[0113] Optionally, the mixture composed of recycled polypropylene (R-PP) and linear polypropylene (L-PP) preferably has at least one of the following properties:

[0114] a) The MFR, determined according to ISO 1133 at 230°C and with a load of 2.16 kg, is 3~25 g / 10 min;

[0115] b) The melt strength of F30, as determined by ISO 16790:2005, is less than 25.0 cN;

[0116] c) The melt elongation of v30, as determined according to ISO 16790:2005, is greater than 100 mm / s, preferably greater than 100~290 mm / s.

[0117] In one embodiment, the mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an FN of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and / or v greater than 100 mm / s as determined according to ISO 16790:2005 30 More preferably, the melt elongation of the mixture composed of recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength and v greater than 100 mm / s as determined according to ISO 16790:2005 30 The melt elongation, even more preferably, of the mixture composed of recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an F of less than 25.0 cN as determined according to ISO 16790:2005. 30 Melt strength, v greater than 100 mm / s as determined according to ISO 16790:2005 30 Melt elongation, and 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.

[0118] For example, a mixture of recycled polypropylene (R-PP) and linear polypropylene (L-PP) has an FN of less than 20.0 cN as determined according to ISO 16790:2005. 30 Melt strength, v greater than 100 mm / s as determined according to ISO 16790:2005 30 Melt elongation, and melt flow rate MFR2 (230°C) of 4~20 g / 10 min as determined according to ISO 1133, more preferably, F as determined according to ISO 16790:2005. 30 Melt strength of 1.0 to less than 20.0 cN, and v measured according to ISO 16790:2005. 30 The melt elongation is greater than 100~290 mm / s, and the melt flow rate MFR2 (230°C) measured according to ISO 1133 is 5~15 g / 10 min.

[0119] Recycled polypropylene (R-PP) and polypropylene (L-PP) can be recycled polypropylene (Rec-PP), and / or linear polypropylene (L-PP) can be linear polypropylene (Lin-PP).

[0120] Linear polypropylene (Lin-PP) can be produced in known ways, such as by using a single-point catalyst or a 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).

[0121] Linear propylene random copolymers (Lin-Ran-PP) contain monomers that can be copolymerized with propylene, such as comonomers like ethylene and / or C4~C4. 12 α-olefins, especially ethylene and / or C4~C 10 α-Olefins, such as 1-butene and / or 1-hexene. Preferably, the linear propylene random copolymer (Lin-Ran-PP) comprises monomers that can be copolymerized with propylene, particularly composed of monomers that can be copolymerized with propylene, said monomers being selected from ethylene, 1-butene, and 1-hexene. More specifically, the linear propylene random copolymer (Lin-Ran-PP) also comprises units that can be 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 that can be derived from ethylene and propylene.

[0122] The comonomer content in the linear propylene random copolymer (Lin-Ran-PP) is preferably greater than 0.2~10.0 mol%, more preferably greater than 0.5~7.0 mol%.

[0123] Preferably, the recycled polypropylene (R-PP) and / or polypropylene (L-PP) is recycled polypropylene (Rec-PP) containing 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 remainder of the recycled polypropylene (Rec-PP) may come from, for example, the coating layer used in cup production.

[0124] Nucleating agent (NA)

[0125] The polypropylene composition (PC) also contains one or more nucleating agents, preferably one nucleating agent.

[0126] Generally, it is understood that polypropylene compositions (PC) may contain any nucleating agents commonly used in the preparation of products and well known to those skilled in the art.

[0127] For example, suitable nucleating agents include organic α-nucleating agents selected from phosphorus-based nucleating agents, such as monophenyl phosphate, diphenyl phosphate, or tetraphenyl phosphate, or metal salts of phosphate esters, as shown in the following formula:

[0128]

[0129] R1 is oxygen, sulfur, or a hydrocarbon group with 1 to 10 carbon atoms; each of R2 and R3 is hydrogen or a hydrocarbon or hydrocarbon group with 1 to 10 carbon atoms; R2 and R3 can be the same or different from each other, two R2, two R3, or R2 and R3 can be bonded together to form a ring, M is a monovalent to trivalent metal atom; n is an integer from 1 to 3, m is 0 or 1, and n>m.

[0130] Preferred examples of α-nucleating agents represented by the above formula include: sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl) 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-isopropyl-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, and bis[2,2'-thiobis(4-methyl-6-tert-butylphenyl) phosphate. Calcium bis[2,2'-thiobis(4-ethyl-6-tert-butylphenyl)phosphate], calcium bis[2,2'-thiobis(4,6-di-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-tert-octylphenyl)phosphate], sodium 2,2'-butylene-bis(4,6-dimethylphenyl)phosphate, sodium 2,2'-butylene-bis(4,6-di-tert-butylphenyl)phosphate, sodium 2,2'-tert-octylmethylene-bis(4,6-dimethylphenyl)phosphate, sodium 2,2'-tert-octylmethylene-bis(4,6-di-tert-butylphenyl)phosphate, sodium bis[2,2'-thiobis(4,6-di-tert-butylphenyl)phosphate, calcium bis[2,2'-thiobis(4,6-di-tert-butylphenyl)phosphate], calcium bis[2,2'-thiobis(4,6-di-tert-butylphenyl)phosphate], magnesium ... [2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate]calcium, [2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate]magnesium, [2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate]barium, [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]sodium, [(4,4'-dimethyl-6,6'-di-tert-butyl-2,2'-biphenyl)phosphate]calcium, [2,2'-ethyl-bis(4-m-butyl-6-tert-butyl ... Sodium phosphate, sodium 2,2'-methylene-bis(4,6-dimethylphenyl)phosphate, sodium 2,2'-methylene-bis(4,6-di-tert-ethylphenyl)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'-methylene-bis(4,6-di-tert-butylphenyl)phosphate], aluminum hydroxyaluminum bis[2,2'-ethylidene-bis(4,6-di-tert-butylphenyl)phosphate], aluminum tris[2,2'-ethylidene-bis(4,6-di-tert-butylphenyl)phosphate].

[0131] The second group of phosphorus-based nucleating agents includes, for example, bis[2,4,8,10-tetra(l,l-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxophosphorus-6-oxide]hydroxyaluminum, and mixtures thereof with lithium myristate or lithium stearate.

[0132] In addition, sorbitol-based nucleating agents, such as selectively substituted dibenzylidene sorbitol, such as 1,3:2,4-dibenzylidene sorbitol, 1,3:2,4-di(methylbenzylidene)sorbitol, 1,3:2,4-di(ethylbenzylidene)sorbitol, 1,3:2,4-di(3,4-dimethylbenzylidene)sorbitol, or rosin, can be used as nucleating agents.

[0133] Furthermore, suitable α-nucleating agents are polymeric nucleating agents selected from ethylene cycloalkane polymers and vinyl alkane polymers. Nucleation using these polymeric nucleating agents is achieved through specialized reaction techniques, wherein the catalyst is prepolymerized with a monomer (such as ethylene cyclohexane (VCH)), or through blending a propylene polymer with a vinyl (cyclo)alkane polymer. These methods are described in detail in, for example, EP 0316187A2 and WO 99 / 24479, the disclosures of which are incorporated herein by reference.

[0134] The α-nucleating agent suitable for the polyolefin compositions of the present invention is another nucleating agent, as described in the literature (Macromolecules 2005, 38, 3688-3695), the disclosure of which is incorporated herein by reference.

[0135] Nucleating agents such as ADK NA-11 (sodium methylene-bis(4,6-dibutylphenyl)phosphate) and ADK NA-21 (containing bis[2,4,8,10-tetratetra(l,l-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-phosphorus-6-oxide]hydroxyaluminum) are suitable and commercially available from Asahi Denka Kokai Co., Ltd. Millad 3988 (3,4-dimethylbenzylsorbitol), Millad 3905, and Millad 3940, available from Milliken & Company, are other examples of nucleating agents that can be used in this invention.

[0136] Other commercially available α-nucleating agents that can be used in the compositions of this invention include, for example, Irgaclear XT 386 (N-[3,5-bis-(2,2-dimethylpropionamide)-phenyl]-2,2-dimethylpropionamide) from Ciba Specialty Chemicals, and Hyperform HPN-68L and Hyperform HPN-20E from Milliken & Company.

[0137] Nonitol-based nucleating agents, such as 1,2,3-trideoxy-4,6:5,7-bis-O-(4-propylphenyl)methylene nonitol (CAS-no. 882073-43-0, e.g. Millad NX8000, supplier: Milliken), are also applicable.

[0138] Other suitable nucleating agents are chemical foaming agents, which can be purchased from Clariant Chemicals using Hydrocerol (trade name).

[0139] Talc is another suitable nucleating agent.

[0140] Talc is particularly preferred. In one preferred embodiment, talc is the sole nucleating agent in the polypropylene composition (PC).

[0141] The particle size d of nucleating agents (such as talc) 50 The micrometer size is between 1 and 30 μm, preferably 2 to 25 μm, more preferably 5 to 20 μm, and most preferably 5 to 15 μm.

[0142] Additive (A)

[0143] Additive (A) can be any useful additive in the technical field of high melt strength polypropylene (HMS-PP) and its applications. Therefore, additive (A) used in the polypropylene compositions of the present invention, and thus additive (A) used in the form of additive mixtures (AM), includes, but is not limited to, stabilizers such as antioxidants (e.g., sterically hindered phenols, phosphites / phosphonates, sulfur-containing antioxidants, alkyl radical scavengers, aromatic amines, hindered amine stabilizers, or mixtures thereof), metal passivators (e.g., Irganox MD 1024), or UV stabilizers (e.g., hindered amine light stabilizers), etc. Other typical additives are modifiers, such as antistatic agents or antifogging agents (e.g., ethoxyamines and amides or glycerides), acid removers, adhesives (e.g., polyisobutylene), lubricants and resins (ionomer waxes, polyethylene and ethylene copolymer waxes, Fischer-Tropsch wax, Montan-based wax, fluorinated compounds or paraffin), as well as slippers and antiblocking agents (e.g., calcium stearate, erucamide, oleamide, talc, natural silica and synthetic silica or zeolite).

[0144] Preferably, the additive (A) is selected from antioxidants (such as sterically hindered phenols, phosphites / phosphonates, sulfur-containing antioxidants, alkyl radical scavengers, aromatic amines, hindered amine stabilizers, or mixtures thereof), metal passivators (e.g., Irganox MD 1024), UV stabilizers (e.g., hindered amine light stabilizers), antistatic agents or antifogging agents (such as ethoxyamines and amides or glycerides), acid scavengers, adhesives (such as polyisobutylene), lubricants and resins (ionomer waxes, polyethylene and ethylene copolymer waxes, Fischer-Tropsch waxes, montan waxes, fluorinated compounds or paraffin waxes), slippers (such as calcium stearate), antiblocking agents (such as erucamide, oleamide, talc, natural silica and synthetic silica or zeolite), and mixtures thereof.

[0145] Preferred additives are slippers, such as calcium stearate.

[0146] As previously stated, Additive (A) does not contain nucleating agents.

[0147] Typically, based on the total mass of the polypropylene composition, the total amount of additive (A) is 15 wt% or less, more preferably 10 wt% or less, such as 0.1 to 10 wt%, preferably 0.1 to 5 wt%, more preferably 0.2 to 1 wt%.

[0148] Polypropylene composition

[0149] The polypropylene composition comprises:

[0150] -- 10.0~50.0wt%, preferably 15.0~40.0wt%, more preferably 20.0~30.0wt% of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP).

[0151] -- 40.0~89.95wt%, preferably 57.5~84.95wt%, more preferably 69.0~79.9wt% high melt strength polypropylene (HMS-PP), its F 30 Melt strength greater than 25.0 cN, v 30 Melt elongation greater than 205 mm / s, where F 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005; and

[0152] -- 0.05~10.0wt%, preferably 1.0~8.0wt%, more preferably 4.0~6.0wt%, such as 5.0~6.0wt% of nucleating agent (NA).

[0153] It is worth noting that, unless otherwise stated, all contents are based on the total mass of the polypropylene composition.

[0154] The total amount of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) in the polypropylene composition is 10.0 to 50.0 wt%, preferably 15.0 to 40.0 wt%, and more preferably 20.0 to 30.0 wt%.

[0155] The polypropylene composition contains F 30 Melt strength greater than 25.0 cN and v 30 Melt elongation greater than 205 mm / s (F 30 Melt strength and v 30 The total amount of high melt strength polypropylene (HMS-PP) with melt elongation (measured according to ISO 16790:2005) is 40.0~89.95wt%, preferably 57.5~84.95wt%, and more preferably 69.0~79.9wt%.

[0156] The total amount of nucleating agent (NA) in the polypropylene composition is 0.05 to 10.0 wt%, preferably 1.0 to 8.0 wt%, more preferably 4.0 to 6.0 wt%, such as 5.0 to 6.0 wt%.

[0157] In a preferred embodiment, apart from recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) and high melt strength polypropylene (HMS-PP), the total amount of other polymers present in the polypropylene composition is no more than 5 wt%, more preferably no more than 2 wt%, and even more preferably no more than 1 wt%, based on the total mass of the polymer materials in the polypropylene composition.

[0158] As previously mentioned, high melt strength polypropylene (HMS-PP) is the main component of the polypropylene composition of the present invention. Therefore, it is preferable that the final polypropylene composition exhibits rheological behavior similar to that of high melt strength polypropylene (HMS-PP).

[0159] Therefore, the preferred F of this polypropylene composition 30 Melt strength greater than 25.0 cN and v 30 Melt elongation greater than 205 mm / s, preferably F 30 The melt strength is greater than 25.0~50.0 cN and v. 30 Melt elongation greater than 205~300 mm / s is used to provide polypropylene compositions with good shear thinning properties. 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005.

[0160] In a preferred embodiment, the polypropylene composition comprises:

[0161] (a) F 30 The melt strength is greater than 25.0~45.0 cN, preferably greater than 25.0~42.0 cN, and most preferably greater than 25.0~40.0 cN; and

[0162] (b)v 30 The melt elongation is greater than 210~300 mm / s, more preferably 215~290 mm / s, even more preferably 220~270 mm / s, and most preferably 225~260 mm / s.

[0163] In a particularly preferred embodiment, the polypropylene composition has an FN greater than 25.0~45.0 cN. 30 Melt strength and v = 215~290 mm / s 30 Melt elongation, for example, F 30 The melt strength is greater than 25.0~42.0 cN and v. 30 Melt elongation is 215~290 mm / s, or F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 Melt elongation is 220~270 mm / s, or F 30 The melt strength is greater than 25.0~40.0 cN and v. 30 The melt elongation is 225~260 mm / s.

[0164] More preferably, the melt flow rate MFR2 (230°C) of the polypropylene composition, as determined according to ISO 1133, does not exceed 15.0 g / 10 min, more preferably 0.5 to 15.0 g / 10 min, and even more preferably 1.0 to 15.0 g / 10 min, such as 1.5 to 15.0 g / 10 min.

[0165] In a particularly preferred embodiment, the melt flow rate MFR2 (230°C) of the polypropylene composition, as determined according to ISO 1133, does not exceed 7.0 g / 10 min, preferably 0.5 to 7.0 g / 10 min, more preferably 0.5 to 6.5 g / 10 min, even more preferably 0.5 to 6.0 g / 10 min, and even more preferably 1.0 to 6.0 g / 10 min, such as 1.5 to 5.0 g / 10 min.

[0166] Therefore, in one specific embodiment, the polypropylene composition comprises:

[0167] (a) The melt flow rate MFR2 (230°C) is not more than 15.0 g / 10 min, more preferably 0.5 to 15.0 g / 10 min, but more preferably 1.0 to 15.0 g / 10 min, such as 1.5 to 15.0 g / 10 min;

[0168] (b) F 30 The melt strength is greater than 25.0~45.0 cN, preferably greater than 25.0~42.0 cN, and most preferably greater than 25.0~40.0 cN; and

[0169] (c)v 30 The melt elongation is greater than 210~300 mm / s, more preferably 215~290 mm / s, even more preferably 220~270 mm / s, and most preferably 225~260 mm / s.

[0170] In a particularly preferred variant according to this embodiment, the melt flow rate MFR2 (230°C) of the polypropylene composition (as determined according to ISO 1133) is not more than 7.0 g / 10 min, preferably 0.5 to 7.0 g / 10 min, more preferably 0.5 to 6.5 g / 10 min, even more preferably 0.5 to 6.0 g / 10 min, but more preferably 1.0 to 6.0 g / 10 min, such as 1.5 to 5.0 g / 10 min.

[0171] Therefore, in one specific embodiment, the melt flow rate MFR2 (230°C) of the polypropylene composition is 0.5~15.0 g / 10 min, F 30 Melt strength is greater than 25.0~45.0 cN, v 30Melt elongation 215~290 mm / s, if melt flow rate MFR2 (230°C) is 1.0~15.0 g / 10 min, F 30 Melt strength is greater than 25.0~42.0 cN, v 30 Melt elongation is 215~290 mm / s, or melt flow rate MFR2 (230°C) is 1.0~15.0 g / 10 min, F 30 Melt strength is greater than 25.0~40.0 cN, v 30 Melt elongation is 220~270 mm / s, or melt flow rate MFR2 (230°C) is 1.0~15.0 g / 10 min, F 30 Melt strength is greater than 25.0~40.0 cN, v 30 The melt elongation is 225~260 mm / s.

[0172] In a particularly preferred variant according to this embodiment, the melt flow rate MFR2 (230°C) of the polypropylene composition (as determined according to ISO 1133) is not more than 7.0 g / 10 min, preferably 0.5 to 7.0 g / 10 min, more preferably 0.5 to 6.5 g / 10 min, even more preferably 0.5 to 6.0 g / 10 min, but more preferably 1.0 to 6.0 g / 10 min, such as 1.5 to 5.0 g / 10 min, or 1.0 to 5.0 g / 10 min.

[0173] foam board

[0174] The present invention also relates to a foamed board made from the polypropylene composition of the present invention.

[0175] The thickness of the foamed board of the present invention is preferably 0.5~10mm and / or the density is 150~250kg / m³. 3 The optimal value is 175~225 kg / m³. 3 Therefore, in one embodiment, the present invention relates to a material with a thickness of 0.5 to 10 mm and / or a density of 100 to 300 kg / m³. 3 More preferably, it is 150~250 kg / m 3 The optimal value is 175~225 kg / m³. 3 Foamed board.

[0176] Preferably, the thickness is 0.5~7.5mm, more preferably 0.5~5.0mm, and particularly preferably 0.7~2.5mm, such as 0.7~1.1mm.

[0177] The diameter of the foamed board, as measured by an optical microscope, is preferably 100~500mm, more preferably 125~400mm, and most preferably 170~320mm.

[0178] Furthermore, the foamed board is characterized by its surface roughness. Typically, the surface roughness is less than 3.5 μm, preferably less than 2.5 μm, and most preferably less than 1.5 μm.

[0179] Foamed boards are preferably covered by a cover layer (CL).

[0180] The density of the coating layer (CL) is preferably at least 0.85 g / cm³.

[0181] Preferably, the cover layer (CL) comprises polypropylene (CL-PP), and more preferably, the content of polypropylene (CL-PP) is at least 50 wt%, more preferably at least 65 wt%, and most preferably at least 80 wt%.

[0182] When the cover layer (CL) contains polypropylene (CL-PP), the MFR2 of polypropylene (CL-PP) as determined according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg is preferably 10~26 g / 10 min.

[0183] The capping layer may contain up to 50 wt%, preferably no more than 35 wt%, and most preferably no more than 20 wt% of one or more fillers. The term "filler" refers to any mineral or non-mineral filler capable of being uniformly added to the polyolefin composition. One or more fillers are preferably inorganic fillers, such as those selected from glass fiber, talc, carbon fiber, chalk, clay, flint, metal carbonates, mica, kaolin, wollastonite, feldspar, and barite.

[0184] Preferably, the polypropylene (CL-PP) is selected from polypropylene cast film, polypropylene blown film, and biaxially oriented polypropylene (BOPP) film. More preferably, the polypropylene (CL-PP) is biaxially oriented polypropylene (BOPP) film.

[0185] The thickness of the cover layer (CL) is preferably no more than 100 μm, more preferably 5 to 40 μm, and most preferably 10 to 30 μm.

[0186] The covering layer can be directly adjacent to the foamed board of the present invention.

[0187] An adhesive layer (AL) may be present between the foamed board and the cover layer (CL) of the present invention.

[0188] If such an adhesive layer (AL) is present, the adhesive layer (AL) preferably comprises a polyethylene-polypropylene mixture (PE-PP) with 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.

[0189] If present, the thickness of the adhesive layer (AL) is typically greater than that of the cover layer (CL).

[0190] If present, the thickness of the adhesive layer (AL) is preferably no more than 120 μm, more preferably 20 to 80 μm, even more preferably 30 to 70 μm, and most preferably 40 to 60 μm.

[0191] However, it is preferable that the foam board and the cover layer (CL) are directly adjacent. Therefore, there is no adhesive layer (AL) between the foam board and the cover layer (CL) in this invention.

[0192] More preferably, there are no other layers besides the foam board and the cover layer.

[0193] Products

[0194] The present invention also relates to an article comprising a foamed board, preferably comprising a foamed board covered by a cover layer (CL) according to the invention.

[0195] The article can be a container, such as a bottle, cup, jar, tube, bowl or tray; a sleeve, such as for a container; a lid, such as for a container; a film; a blank; a pad; a carrier; a tube; a substrate; a pipe; a vessel; a panel, such as a building panel; a liner, such as a truck liner; tape; a roll or profile.

[0196] The product is preferably a container.

[0197] The container preferably comprises a foamed plate covered by a cover layer (CL) according to the invention, wherein the cover layer (CL) is located on the inside of the container. The inside is the side where the liquid is located.

[0198] For example, the container can be a bottle, cup, jar, tube, bowl, or tray. In a particularly preferred embodiment, the container is a cup, the body of which preferably comprises the foam board of the present invention, more preferably is composed of the foam board of the present invention. Preferably, the body of the cup has a cover layer (CL) on its inner side.

[0199] By using the foam board of the present invention as the cup body, good heat insulation performance can be obtained, for example, in the case of cold and hot drinks. Furthermore, since the covering layer is located on the inside of the cup, the pores of the foam board are tightly isolated from the liquid inside the cup, thus minimizing the amount of liquid entering the cup. Typically, in a cup, the covering layer is located on the outside to ensure sufficient printability. However, the foam board according to the present invention has good printability itself, thereby eliminating the need for a specific layer on its exterior.

[0200] method

[0201] As described above, high melt strength polypropylene (HMS-PP) is produced using polypropylene (PP) (preferably linear polypropylene (l-PP)). The method includes at least one step (a), wherein the polypropylene (PP) is reacted with a thermally decomposable free radical forming agent and optionally with a bifunctional unsaturated monomer and / or a multifunctional unsaturated low molecular weight polymer to obtain high melt strength polypropylene (HMS-PP).

[0202] The present invention also relates to a method comprising the following steps:

[0203] a) Producing a polypropylene composition comprising:

[0204] -- 10.0~50.0wt%, preferably 15.0~40.0wt%, more preferably 20.0~30.0wt% of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP).

[0205] -- 40.0~89.95wt%, preferably 57.5~84.95wt%, more preferably 69.0~79.9wt% high melt strength polypropylene (HMS-PP), its F 30 Melt strength greater than 25.0 cN, v 30 Melt elongation greater than 205 mm / s, where F 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005; and

[0206] -- 0.05~10.0wt%, preferably 1.0~8.0wt%, more preferably 4.0~6.0wt%, such as 5.0~6.0wt% of nucleating agent (NA).

[0207] In this process, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP), high melt strength polypropylene (HMS-PP) and nucleating agent (NA) are combined and mixed simultaneously or sequentially in a mixing unit.

[0208] In step a), the total amount of recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) in the polypropylene composition is 10.0 to 50.0 wt%, preferably 15.0 to 40.0 wt%, more preferably 20.0 to 30.0 wt%.

[0209] The polypropylene composition contains F 30 Melt strength greater than 25.0 cN and v 30 Melt elongation greater than 205 mm / s (F 30 Melt strength and v 30The total amount of high melt strength polypropylene (HMS-PP) with melt elongation (measured according to ISO 16790:2005) is 40.0~89.95wt%, preferably 57.5~84.95wt%, and more preferably 69.0~79.9wt%.

[0210] The total amount of nucleating agent (NA) in the polypropylene composition is 0.05 to 10.0 wt%, preferably 1.0 to 8.0 wt%, more preferably 4.0 to 6.0 wt%, such as 5.0 to 6.0 wt%.

[0211] Further, step a) may optionally include an additive (A) as defined herein.

[0212] The method preferably further includes the following step b) after step a).

[0213] b) Forming a foamed article, including the step of foaming the polypropylene composition obtained in step a), wherein the preferred foamed article is a foamed board.

[0214] More preferably, the method further includes the following step c) after step b).

[0215] c) The foamed product (preferably a foamed board) obtained in step b) is used to make a cup.

[0216] Preferably, the recycled polypropylene (R-PP) or L-PP is recycled polypropylene (Rec-PP), and the method further includes step c) (if present) or step d) following step b):

[0217] d) Use the polymer residue present after step b) to form recycled polypropylene (Rec-PP).

[0218] Preferably, an extruder is used to prepare the propylene composition. More preferably, the extruder includes a feed inlet (FT), a first mixing zone (MZ1), an optional second mixing zone (MZ2), and a die (D) in the direction of operation. Preferably, the extruder is a screw extruder, such as a twin-screw extruder. Thus, high melt strength polypropylene (HMS-PP), a nucleating agent (NA), recycled polypropylene (R-PP), and / or linear polypropylene (L-PP), and an optional additive (A) (if present) different from the nucleating agent (NA), are fed into the extruder through the feed inlet (FT), thus preferably using a feeder, and subsequently downstream through the first mixing zone (MZ1). Preferably, the shear stress in the first mixing zone (MZ1) reaches such a level that the high melt strength polypropylene (HMS-PP) begins to melt and mix with the nucleating agent (NA), recycled polypropylene (R-PP), and / or linear polypropylene (L-PP), and the optional additive (A) (if present) different from the nucleating agent (NA).

[0219] After the first mixing zone (MZ1), if a second mixing zone (MZ2) is present, the obtained product is passed downstream through the second mixing zone (MZ2). Finally, the polypropylene composition is discharged through the mold (D).

[0220] In the presence of a second mixing region, the first mixing region (MZ1) is longer than the second mixing region (MZ2). Preferably, the length ratio (mm(MZ1) / mm(MZ2)) between the first mixing region (MZ1) and the second mixing region (MZ2) is at least 2 / 1, more preferably 3 / 1, but more preferably 2 / 1 to 15 / 1, and even more preferably 3 / 1 to 10 / 1.

[0221] High melt strength polypropylene (HMS-PP) can also be prepared using the same extruder and then used in step a).

[0222] As previously stated, the method preferably further includes the following step b) after step a).

[0223] b) Forming a foamed article, including the step of foaming the polypropylene composition obtained in step a).

[0224] Foaming processes fall within the scope of this art. In such processes, the melt of the polypropylene composition of the present invention, containing a gaseous or liquid foaming agent (such as butane, a mixture of butane and propane, hydrofluorocarbons, or CO2), expands suddenly due to a pressure drop. Liquid foaming agents, such as butane or a mixture of butane and propane, are preferred. Continuous and discontinuous foaming processes can be employed. In a continuous foaming process, the polypropylene composition is melted and filled with gas in an extruder at a pressure typically above 20 bar, and then extruded through a die, where the pressure drop results in foam formation. For example, the mechanism of polypropylene foaming during extrusion is explained in the literature (HE Naguib, CB Park, N. Reichelt, Fundamental foaming mechanisms governing the volume expansion of extruded polypropylene foams, Journal of Applied Polymer Science, 91, 2661-2668 (2004)). The foaming process has been outlined in the literature (STLee, Foam Extrusion, Technomic Publishing (2000)). In a discontinuous foaming process, polypropylene composition (micro)particles are filled with a foaming agent under pressure and heated to below the melting temperature before the pressure is suddenly released in an autoclave. The dissolved foaming agent generates bubbles and forms a foam structure. For example, patent (DE 3539352) describes the discontinuous preparation of foamed beads.

[0225] Based on the total weight of the polymer composition and the foaming agent, the amount of foaming agent used is generally less than 10 wt%, preferably less than 5 wt% (based on the total weight of the polymer composition and the foaming agent).

[0226] Preferred foaming agents are butane and mixtures of butane and propane.

[0227] As described above, it is preferable to manufacture a foamed board. Methods for manufacturing foamed boards are generally known in the art, particularly the method described in patent (TW M 463649), the entire contents of which are incorporated herein by reference. It is preferable to prepare the foamed board according to the invention according to the method and apparatus described in TW M463649.

[0228] The article can be a container, such as a bottle, cup, jar, tube, bowl or tray; a sleeve, such as for a container; a lid, such as for a container; a film; a blank; a pad; a carrier; a tube; a substrate; a pipe; a vessel; a panel, such as a building panel; a liner, such as a truck liner; tape; a roll or profile container, etc., such as those prepared according to the present invention using conventional methods.

[0229] use

[0230] The present invention also relates to the use of the polypropylene composition according to the invention in the production of foamed boards, which satisfy the following relationship (I).

[0231] Bending strength (MD) / Bending strength (CD) ≤ 1.2 (I)

[0232] in,

[0233] Bending strength (MD) is the bending strength measured in the machine direction according to SCAN P29:95, and the unit is mN; and

[0234] Bending strength (CD) is the bending strength measured in the transverse direction according to SCAN P29:95, and the unit is mN.

[0235] The present invention also relates to the use of the polypropylene composition according to the invention in the production of foamed boards, which satisfy the following relationship (II).

[0236] Thermal conductivity at 100℃ / Thermal conductivity at 20℃ ≤ 1.5 (II)

[0237] in,

[0238] The thermal conductivity at 100℃ is the thermal conductivity of the foamed board at 100°C, measured according to ISO 1856:2000, and is expressed in m·K; and

[0239] The thermal conductivity at 20°C refers to the thermal conductivity of the foamed board at 20°C, as measured according to ISO 1856:2000, and is expressed in m·K.

[0240] Preferably, the present invention relates to the use of the polypropylene polymer according to the present invention for producing foamed boards that satisfy the above-described relations (I) and (II).

[0241] The preferred features of the polypropylene compositions, foamed sheets, articles, and methods of the present invention are also preferred features for use according to the present invention.

[0242] Example

[0243] A. Measurement Method

[0244] Unless otherwise specified, the following definitions of terms and measurement methods apply to the general description of the present invention above, and also to the following embodiments.

[0245] MFR

[0246] The MFR of polypropylene was determined according to ISO 1133 at a load of 2.16 kg and a temperature of 230 °C.

[0247] Polymer density

[0248] Density was determined according to ISO 1183-1 - Method A (2004). Samples were prepared by compression molding according to ISO 1872-2:2007.

[0249] Comonomer content in polypropylene

[0250] After basic calibration steps were performed using quantitative 13C nuclear magnetic resonance (NMR) in a manner conventional in the art, the comonomer content was determined by quantitative Fourier transform infrared spectroscopy (FTIR). The film was extruded to a thickness of 250 μm, and the spectra were recorded in transmission mode.

[0251] Specifically, the ethylene content in the polypropylene-co-ethylene copolymer is determined by adjusting the concentration of ethylene in the 720-722 cm⁻¹ column. -1 and 730~733cm -1 The baseline correction peak area of ​​the quantitative band at 767 cm⁻¹ was used to determine the value. The propylene-1-butene copolymer at 767 cm⁻¹... -1 Evaluation was conducted. Quantitative results were obtained based on the reference film thickness.

[0252] Melting temperature (T) m ), heat of fusion (H) f ), crystallization temperature (T) c ) and heat of crystallization (H c )

[0253] According to ISO 11357 / 3, the melting temperature T of a 5–10 mg sample was determined using a TA Instruments Q2000 differential scanning calorimeter (DSC). m and crystallization temperature T c .

[0254] Crystallization and melting temperatures were obtained during heating / cooling / heating cycles at a scan rate of 10°C / min between 30 and 225°C. Melting and crystallization temperatures were obtained from the endothermic and exothermic peak values ​​during the cooling and second heating cycles, respectively.

[0255] MFR2 (230°C) was determined according to ISO 1133 (230°C, 2.16 kg load).

[0256] Melt strength F 30 and melt elongation v 30

[0257] The tests described herein are in accordance with ISO 16790:2005.

[0258] The strain hardening behavior was determined by the method described in the literature (Rheotens-Mastercurves and Drawability of PolymerMelts, MH Wagner, Polymer Engineering and Sience, Vol. 36, pages 925-935). The contents of that literature are included herein by reference. The strain hardening behavior of the polymer was analyzed using a rheometer (Rheotens apparatus, manufactured by Gottfert, Siemensstr. 2, 74711 Buchen, Germany), in which the melt strands were stretched downwards at a given acceleration.

[0259] Rheological tests simulated the industrial spinning and extrusion process. In principle, the melt is extruded or extruded through a circular die, and the resulting strand is pulled out. Stress on the extruded material is recorded as a function of melt properties and measurement parameters (particularly the ratio between output and pull-out speeds, which is essentially a measure of elongation). For the results below, the material was extruded using a laboratory extruder, the HAAKE Polylab system, and a gear pump (L / D = 6.0 / 2.0 mm) with a cylindrical die. The gear pump was pre-adjusted to a strand extrusion rate of 5 mm / s, and the melt temperature was set to 200°C. The length of the spun yarn between the die and the rheological wheel was 80 mm. At the start of the test, the take-up speed of the rheological wheel was adjusted to the speed of the extruded polymer filament (with zero tensile force); then the take-up speed of the rheological wheel was slowly increased until the polymer filament broke, at which point the experiment began. The acceleration of the rheological wheel was very small, thus allowing the tensile force to be measured under quasi-steady-state conditions. The acceleration of pulling the melt strand downwards was 120 mm / s. 2 The rheometer is used in conjunction with the PC program EXTENS. This is a real-time data acquisition program that displays and stores the measured data of tensile force and pull-down speed. The endpoints of the rheological curve (force versus pulley speed) are considered as F. 30 Melt strength and tensile properties.

[0260] gel content

[0261] Weigh approximately 2g of the polymer (m p ), put it into the weighing (m) p+m The polymer was placed in a metal sieve. In a Soxhlet apparatus, the polymer in the sieve was boiled with xylene for 5 hours for extraction. Then, fresh xylene was used instead of the eluent, and the mixture was boiled for another hour. Subsequently, the sieve was dried and weighed again (m). XHU+m According to m XHU+m -m m =m XHU The mass of heat-insoluble xylene obtained by the formula (m)XHU ) and polymer mass (m p The relationship between xylene and heat-insoluble matter (m) is used to obtain the fraction of xylene. XHU / m p .

[0262] Polymer particle size / particle size distribution

[0263] Particle size distribution tests were performed on the polymer samples. Sieve analysis involved a set of sieve columns with wire mesh sieves and the following sieve aperture sizes: > 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 into the top sieve with the largest aperture. Each lower sieve in the column had a smaller aperture than the one above it (see dimensions shown above). The bottom was the receiver. The column was placed in a mechanical oscillator, which shook the column. After the vibration ended, the material on each sieve was weighed. The weight of the sample on each sieve was then divided by the total weight to obtain the percentage retained on each sieve.

[0264] particle size of nucleating agent

[0265] Median particle size d 50 Calculated from particle size distribution (mass percentage), determined by gravity liquid sedimentation using a Sedigraph 5100 (manufacturer: Micromeritics Corporation) according to ISO 13317-3.

[0266] Foam density

[0267] The determination was performed using an analytical and semi-micro precision balance (manufacturer: Switzerland PRECISA Gravimetrics AG, Switzerland) and a specific gravity balance (XS225A); the determination method was based on Archimedes' principle, which automatically calculated the density of the sample.

[0268] Bubble diameter

[0269] The size and diameter of the bubble pores were determined using an optical microscope, specifically a Tawain CBS Stereoscopic microscope.

[0270] The measurement method used is as follows:

[0271] 1. Cut a strip of foam material along the transverse (CD) and machine direction (MD).

[0272] 2. Hold the foam material with flat pliers and shave it precisely with a razor blade.

[0273] 3. Use a 100× focusing microscope and adjust the illumination of the foam material.

[0274] 4. Measure the length and width of each individual bubble in the CD and MD directions and record the values.

[0275] 5. Count the individual bubbles that have been measured and record the values.

[0276] 6. Measure the cell thickness and total length of each individual cell across 3-4 tangents in the CD and MD directions, and record the values.

[0277] 7. Starting from the bottom of the first group of cells to be measured, measure the overall thickness three times, from the middle of the cell group to the top of the cell group.

[0278] 8. Measure the total length from the lowest complete cell to the highest complete cell.

[0279] 9. Move the microscope field of view so that the bottom of the topmost incomplete bubble touches the bottom of the lens.

[0280] 10. Repeat steps 4-9 for each new individual cell until a portion of the material approximately 0.200" to 0.800" has been measured. Ensure that the total length and cell combinations do not overlap. Each subsequent total length measurement is performed from the top of the previous highest complete cell to the top of the current highest complete cell.

[0281] Surface roughness of foam

[0282] The measurements were performed using an SJ-310 portable surface roughness measuring instrument (manufacturer: Mitutoyo, Japan). This surface roughness measuring instrument (also known as a profilometer) is a contact-type surface roughness measuring instrument. Roughness determination is fully automated and operates through built-in software.

[0283] Bending strength

[0284] According to the SCAN P29:95 method published by the Scandinavian Pulp, Paper and Board Testing Committee, the machine and transverse bending strength is determined.

[0285] thermal conductivity

[0286] Thermal conductivity of foamed boards was determined at 20°C and 100°C according to ISO 1856:2000.

[0287] Invention Embodiment 1 (IE1)

[0288] The method for preparing foamed boards is as follows:

[0289] 1. The MFR2 (230°C) of 750 kg of dry-mixed Daploy™ WB 140HMS (Borealis AG (HMS-PP)) was determined to be 2.1 g / 10 min according to ISO 1133; F 30 The melt strength, as determined according to ISO 16790:2005, is 36 cN; v 30 Melt elongation was measured to be 230 mm / s according to ISO 16790:2005; 248 kg of recycled polypropylene (MFR2 (230°C)) was measured to be 5.8 g / 10 min according to ISO 1133; F 30 The melt strength, as determined according to ISO 16790:2005, is 16.9 cN; v 30 The melt elongation was determined to be 270 mm / s according to ISO 16790:2005, and 2 kg of talc powder was used. The recycled polypropylene was obtained by recycling foamed sheets prepared in a previous production method (the same method).

[0290] 2. The mixture obtained in step 1 is fed into the first single-screw extruder (manufactured by Pitac Taiwan) (screw diameter 90mm; L / D ratio 26). The extruder is operated at 200°C (5 heating zones: 150°C; 200°C; 200°C; 200°C; 200°C) to melt the polymer;

[0291] 3. Based on the total weight of the mixture, 3 wt% liquid butane (as a foaming agent) is injected into the last section of the first single-screw extruder to obtain a melt mixture;

[0292] 4. The molten mixture is passed through a second single screw extruder (manufactured by Pitac Taiwan) (screw diameter 120mm; L / D ratio 34), thereby cooling the molten mixture to 160°C at the end of the second single screw extruder;

[0293] 5. The molten mixture obtained in step 4 is passed through an extrusion die placed at the end of the second extruder. Upon exiting the extruder, the molten mixture is exposed to a pressure drop that suddenly becomes atmospheric pressure, causing the foaming agent to expand within the molten mixture, thus completing foaming and producing a foam structure. The foam structure is then cooled in a cooling cylinder at a temperature below 100°C to obtain a density of 200 kg / m³. 3Foamed board with a thickness of 0.8mm.

[0294] 6. Subsequently, the foamed board and the 20μm thick BOPP film are laminated onto the BOPP film through an online extrusion lamination unit (manufacturer: YC Group Taiwan) to obtain a 2-layer board.

[0295] Embodiment 2 of the Invention (IE2)

[0296] The steps of Embodiment 1 of the invention were repeated, except that the thickness of the foam board in step 5 was 1.0 mm.

[0297] Comparative Example 1 (CE1)

[0298] Cupforma Natura TM PE, from Stora Enso (standard LDPE laminated paper cups).

[0299] The results of embodiments IE1 and IE2 and comparative example CE1 of the present invention are listed in Table 1 below.

[0300] Table 1: Results of Embodiments and Comparative Examples of the Invention

[0301]

[0302] As can be seen from the above, the composition of the present invention gives the foamed board a balanced resistance to bending in both the machine direction and the transverse direction, thus simplifying cup production because the blank can be used in every direction. Furthermore, the foamed board has excellent thermal insulation properties, unaffected by temperature.

[0303] The produced sheets are cut using a standard paper cup machine (Eagle 1000S ACE Pack Korea) and used for cup production. The heating element is modified to form the edge of the cup.

Claims

1. A polypropylene composition comprising: - 10~50wt% recycled polypropylene (R-PP) and / or linear polypropylene (L-PP). - 40.0~89.95wt% of a high melt strength polypropylene (HMS-PP) having a F 30 a melt strength of more than 25.0 cN, v 30 a melt extensibility of more than 205 mm / s, wherein F 30 a melt strength and v 30 the melt extensibility is determined according to ISO 16790:2005; and - 0.05~10wt% nucleating agent (NA).

2. The polypropylene composition according to claim 1, characterized in that, The recycled polypropylene (R-PP) and / or linear polypropylene (L-PP) have at least one of the following properties: a) The MFR, determined according to ISO 1133 at 230°C and with a load of 2.16 kg, is 3~25 g / 10 min; b) F as determined according to ISO 16790:2005 30 Melt strength less than 25.0 cN.

3. The polypropylene composition according to any one of the preceding claims, characterized in that, The recycled polypropylene (R-PP) is recycled polypropylene (Rec-PP) containing at least 50 wt% recycled high melt strength polypropylene (HMS-PP).

4. The polypropylene composition according to any one of the preceding claims, characterized in that, The nucleating agent (NA) is talc.

5. A foamed board made from the polypropylene composition of any of the preceding claims.

6. The foamed board according to claim 5, characterized in that, The thickness of the foamed sheet is 0.5 to 10 mm and / or the density is 150 to 250 kg / m 3 .

7. The foamed board according to claim 5 or 6, characterized in that, The foamed board is covered by a cover layer (CL).

8. The foamed board according to claim 7, characterized in that, The foam board and the cover layer (CL) are directly adjacent to each other.

9. An article having the foamed board of any one of claims 5-8.

10. A method comprising the following steps: a) Producing a polypropylene composition, said polypropylene composition comprising: - 10~50wt% recycled polypropylene (R-PP) and / or linear polypropylene (L-PP). - 40~89.95wt% high melt strength polypropylene (HMS-PP), wherein the F of the high melt strength polypropylene (HMS-PP) 30 Melt strength greater than 25.0 cN, v 30 Melt elongation greater than 205 mm / s, where F 30 Melt strength and v 30 Melt elongation was determined according to ISO 16790:2005; and - 0.05~10wt% nucleating agent (NA) In this process, recycled polypropylene (R-PP) and / or linear polypropylene (L-PP), high melt strength polypropylene (HMS-PP) and nucleating agent (NA) are combined and mixed simultaneously or sequentially in a mixing unit.

11. The method according to claim 10, characterized in that, The method further includes the following step b) after step a). b) Forming a foamed article, including the step of foaming the polypropylene composition obtained in step a).

12. The method according to claim 11, characterized in that, The method further includes the following step c) after step b): c) The foamed product obtained in step b) is used to make a cup.

13. The method according to claim 11 or 12, characterized in that, The recycled polypropylene (R-PP) is recycled polypropylene (Rec-PP), and the method further includes step c) (if present) or step d) following step b): d) Use the polymer residue present after step b) to form recycled polypropylene (Rec-PP).

14. Use of the polypropylene composition according to any one of claims 1-4 in the production of foamed boards, characterized in that, The foamed board satisfies the following relationship (I): Bending strength (MD) / Bending strength (CD) ≤ 1.2 (I) in, Bending strength (MD) is the bending strength measured in the machine direction according to SCAN P29:95, and the unit is mN; and Bending strength (CD) is the bending strength measured in the transverse direction according to SCAN P29:95, and the unit is mN.

15. Use of the polypropylene composition according to any one of claims 1-4 in the production of foamed boards, characterized in that, The foamed board satisfies the following relationship (II): Thermal conductivity at 100℃ / Thermal conductivity at 20℃ ≤ 1.5 (II) in, The thermal conductivity at 100℃ is the thermal conductivity of the foamed board at 100°C, measured according to ISO 1856:2000, and is expressed in m·K; and The thermal conductivity at 20°C is the thermal conductivity of the foamed board at 20°C as measured according to ISO 1856:2000, and the unit is m·K.

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