JPWO2022090105A5 - - Google Patents

Description

The present disclosure relates to polyolefin compositions, and in particular to polypropylene compositions containing recycled polypropylene that can be used in injection molded articles. The polyolefin compositions of the present disclosure can be used in the automotive field and in household items such as suitcases and containers.

In WO 2006/067023, the polyolefin compositions used for this purpose, particularly suitcases, are
a crystalline propylene polymer less than 50%-77%, preferably less than 50%-70%, having an amount of isotactic pentads ⁽ mmmm) of 97.5 mol % or more and a polydispersity index in the range of 4-10, preferably 5-10, more preferably 5.5-10, as measured by 13C-NMR for the fraction insoluble in xylene at 25°C;
an elastomeric copolymer of 13% to 28%, preferably 15% to 28%, or more, of ethylene and propylene having a repeat unit content of 30% to 70%, preferably 35% to 60%, derived from ethylene and being partially soluble in xylene at ambient temperature, the intrinsic viscosity value of the polymer fraction soluble in xylene at ambient temperature being in the range of 2 to 4 dl/g;
10% to 22%, preferably 10% to 20%, of polyethylene having an intrinsic viscosity value in the range of 1 to 3 dl/g, optionally containing less than 10% of repeat units derived from propylene;
It is described as being formed from

The composition has good rigidity, impact resistance, and stress resistance,

In general, polyolefin compositions are valued for their performance, but they have raised concerns from a sustainability perspective, particularly the fact that they are produced from non-renewable resources.

It is therefore common to attempt to alleviate this problem by using variable amounts of recycled polyolefins, such as polypropylene or polyethylene, in multicomponent polyolefin compositions.

Recycled polyolefins are obtained from material streams derived from post-consumer waste (PCW) that undergo various steps to separate them from other polymers (e.g. PVC, PET or PS).

One of the key issues in polyolefins recovery, especially when dealing with material streams derived from post-consumer waste (PCW), is the difficulty in quantitatively separating polypropylene (PP) and polyethylene (PE) and vice versa, so that despite being called recycled PE (rPE) or recycled PP (rPP), commercial products derived from PCW are found to be mixtures of PP and PE with secondary components amounting to up to <50 wt%.

This fact, coupled with the presence of additives and secondary components in recycled materials that may not be fully suitable for assuming these uses, means that such recycled PP/PE blends may exhibit mechanical, optical and aesthetic degradation during re-injection and have poor compatibility between the main polymer phases. As a result, products utilizing r-PP or r-PE are perceived as less reliable due to the poor performance of compositions made from them.

This has led to strong opposition to the use of recycled materials in applications that require high performance, limiting them to low-cost, less demanding applications.

It was unexpectedly found that certain formulations based on recycled polypropylene can be used to prepare high-flow injection-molded parts with an excellent combination of mechanical and aesthetic properties.

Therefore, an object of the present disclosure is to provide a polypropylene composition,
(a) 52 % to 80 % by weight , preferably 55 % to 75 % by weight , more preferably 58 % to 70% by weight , of recycled polypropylene (r-PP);
(b) 8 to 30% by weight of recycled polyethylene;
(c) 4 % to 20 % by weight , preferably 5 % to 18% by weight , more preferably 6 % to 15% by weight , of a polyolefin elastomer (POE);
(d) i) 20 % to 90% by weight of a crystalline polypropylene component comprising a fraction A1 having a melt flow rate MFR ^I of 0.5 to 10 g/10 min and a fraction A2 having a melt flow rate MFR ^II of 75 % to 25 % by weight with MFR ^II / MFR ^I of 30 to 2000, said fractions A1 and A2 being independently selected from the group consisting of propylene homopolymers , propylene random copolymers containing up to 8% by weight of ethylene, and propylene random copolymers containing up to 8% by weight of at least one C4 _- C10 _α -olefin, and
ii) a copolymer component of 10% to 80% by weight of ethylene and at least one C ₃ -C ₁₀ α-olefin, said copolymer comprising 10% to 70% by weight of ethylene and optionally a small amount of a diene, soluble in xylene at 25° C., and having an intrinsic viscosity [η] of 4 to 9 dl/g;
3% to 12 % by weight , preferably 4 % to 10 % by weight, more preferably 5 % to 8 % by weight of a composition comprising
A polypropylene composition comprising:
The entire composition has a melt flow rate (ISO 1133 230°C/2.16 kg) value of 8.0 g/10' to 30.0 g/10', preferably 10.0 g/10' to 25.0 g/10', more preferably 12 to 20.0 g/10', the percentages of (a), (b), (c) and (d) being based on the total weight of the polypropylene composition.

For purposes of this specification, the term "copolymer" refers to polymers with two different repeat units in the chain and polymers with more than two different repeat units, such as terpolymers. "Ambient temperature" and "room temperature" refer to a temperature of 25°C.

As used herein, the term " crystalline polypropylene" refers to a propylene polymer having an amount of isotactic pentads ( mmmm) greater than 70 mole %, as measured by C-NMR relative to the fraction insoluble in xylene at ²⁵ ° C., and an " elastomeric " polymer refers to a polymer having a solubility of more than 50% by weight in xylene at ambient temperature.

The characteristics of the components forming the polypropylene composition are not closely related to one another, meaning that a preference level of a particular level of one of these characteristics does not necessarily correspond to the same preference level of the remaining characteristics of the same or different components, whereas in the present disclosure, any of the components (a)-(d) and any preferred range of characteristics of components (a)-(d) is intended to be combined with one or more of the characteristics of any of the preferred ranges of components (a)-(d) and any possible additional components and their characteristics described in the present disclosure.

The r-PP component (a) comprises plastic waste of post-industrial or post-consumer origin. Preferably, it is from post-consumer waste (PCW) PP packaging waste, such as detergent and shampoo bottles, dairy cans, meat dishes, etc. The PP raw material waste can be pre-sorted by waste management organizations. Suitable PP sources are, for example, waste collected according to the DSD324 (05-2012) and DSD324-1 standards (02-2016). Optical sorting can also remove unwanted polymers, but some contamination with polystyrene or polyethylene (PE) may occur, thus preventing their use as the sole polymer component of the composition.

PP is available in three product series: PP homopolymer (PPh), PP random copolymer (PPr) and PP impact copolymer (or polyphase PP copolymer PPc).

The waste is characterized as originating, for example, from (a) extrusion seed and film materials that contain primarily PP homopolymer (PPh) and PP random copolymer (PPr) and no actual rubber (e.g., biaxially oriented polypropylene (BOPP)) and (b) injection materials that are a mixture of PP homopolymer (PPh), PP random copolymer (PPr) and impact copolymer (PPc) and contain approximately 15% by weight of rubber.

The recycled PP component (a) is comprised of approximately half packaging material (BOPP) and half rubber-containing injection material, which may include, for example, C2-C3 rubber, thermoplastic elastomer (TPE), ethylene propylene diene monomer (EPDM) or ethylene propylene rubber (EPR).

The recycled PP itself used as component (a) in the polymer composition gives a mixture with a rubber content (rubber from the rubber-containing injection material, the weight percentages being based on the total amount of the recycled PP mixture) of, for example, 1.5-12% by weight. The recycled PP (a) of the polypropylene composition preferably consists of 25-75% by weight of BOPP and 25-75% by weight of the rubber-containing injection material, the weight percentages being based on the total amount of recycled PP.

The recycled PP is preferably present in the polymer composition at 55 % to 75% by weight , more preferably 58 % to 70% by weight , the weight percentages being based on the total weight of the polypropylene composition.

Although the melt flow rate (ISO 1133 230°C/2.16 kg) of the recycled PP is not critical, it generally ranges from 5 to 150 g/10', preferably from 8 to 120 g/10', and more preferably from 40 to 100 g/10'.

The polymer component (b) comprises recycled PE (rPE), which includes PE waste collected by various means, such as PE bottles, clean PE containers having a volume of 5 liters or more and collected in accordance with environmental standards, or PE extruded pipes. The recycled PE preferably comprises at least 90% by weight, more preferably at least 92% by weight, and most preferably at least 95% by weight of recycled high density polyethylene (HDPE).

The recycled PE contains multiple contaminants, which are removed by multiple steps including cleaning, washing and sorting. The PE reclaimed material may contain 0-6 wt%, more preferably 1-5 wt%, most preferably 3-4.5 wt% polypropylene and up to 1 wt% polystyrene contaminants, where the wt% are based on the total amount of recycled PE.

The recycled PE preferably has a density in the range of about 0.94 to 0.97 g/ ^cm3 .

The MFR (2.16 kg, 190°C) of the recycled PE is preferably within the range of 0.1 to 5 g/10', more preferably within the range of 0.1 to 0.5 g/10' , making it suitable for blow molding materials . In a specific embodiment, the recycled PE can have a MFR 2.16 kg, 230°C (g/10 min) of preferably 0.4 to 0.9, more preferably 0.45 to 0.85.

The recycled PE is preferably present in the polymer composition at 10-25 wt%, more preferably 15-23 wt%, wherein the wt% is based on the total weight of the polypropylene composition.

Component (c) includes a polyolefin elastomer (POE) which is an ethylene-α-olefin copolymer. Examples of POE include _C2 - _C4 copolymers, _C2 - _C6 copolymers, and _C2 - _C8 copolymers.

Preferably, the POE comprises a _C2 - _C6 or _C2 - _C8 copolymer containing 70-80 wt.%, more preferably 73-78 wt.%, and most preferably 74-77 wt.%, of ethylene, wherein the weight percent ethylene is relative to the POE.

The POE of the present disclosure preferably comprises an ethylene (C2) octene (C8) elastomer obtained by a one-center transition metal compound based catalyst.

The POE preferably has a density between 0.85 and 0.89 g/ ^cm3 , more preferably between 0.855 and 0.885 g/ ^cm3 , and most preferably between 0.86 and 0.875 g/ ^cm3 .

The MFR of the POE is preferably between 0.3 and 1, more preferably between 0.4 and 0.7, and most preferably between 0.45 and 0.6 MFR (190°C, 2.16 kg).

POE is commercially available; examples of POE include Infuse 9107, Infuse 9077, and Engage XLT8677, all manufactured by Dow Chemical Company.

The POE is preferably present in an amount of from 4 % to 20 % , preferably from 5 % to 18 % , more preferably from 5 % to 8 % by weight of the polypropylene composition.

Component (d) of the composition comprises at least two components : a crystalline polypropylene component and a copolymer component , where the crystalline polypropylene component (i) is present in an amount of 20 % to 90% by weight, preferably 30 % to 80 % by weight , and most preferably 50 % to 80 % by weight of the total weight of the masterbatch composition, and the copolymer component (ii) is present in an amount of 80 % to 10 % by weight , preferably 70 % to 20 % by weight, and most preferably 50 % to 20 % by weight of the total weight of the masterbatch composition, wherein the sum of the percentages of each component is equal to 100% by weight .

Fractions A1 and A2 forming the crystalline polypropylene component (i) are each propylene homopolymers, containing up to 8%, preferably 0.2% to 5%, of propylene random copolymers of ethylene or up to 8%, preferably 1% to 8%, of propylene random copolymers of at least one _C4 - _C10 α-olefin of the formula _CH2 =CHR, where R is a linear or branched C1-C8 alkyl or aryl radical, such as phenyl. Exemplary C4-C10 α-olefins are 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, of which 1-butene is particularly preferred.

Fractions A1 and A2 differ from each other in their average molecular weight, as described above for the melt flow rate, with fraction A1 having a relatively high molecular weight (low melt flow rate MFRI 0.5-10 g/10 min) and fraction A2 having a relatively low molecular weight (high melt flow rate), defined by the ratio MFR ^II /MFR ^I , which is in the range 30-2000, preferably 40-2000, more preferably 50-1000, even more preferably 60-500.

Generally, for fractions A1 and A2, the content of polymers insoluble in xylene at room temperature is at least 80% by weight, more preferably at least 85% by weight, most preferably at least 90% by weight. For propylene homopolymers, the content of polymers insoluble in xylene at room temperature, based on the weight of the single fraction , is at least 90% by weight, more preferably at least 95% by weight, most preferably at least 97% by weight.

Component (ii) comprises a copolymer component of 10-70% by weight ethylene, at least one C3- _C10 α-olefin of formula _CH2 =CHR, where R is a straight or branched C1-C8 alkyl or aryl radical such as phenyl, and optionally a minor amount of a diene. The ethylene content of the copolymer component is preferably 15-60% by weight, most preferably 15-50% by weight.

Exemplary C3-C10 α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, of which propylene and 1-butene are particularly preferred. Suitable dienes include butadiene, 1,4-hexadiene, 1,5-hexadiene, ethylidene-norbornene-1. When present, the amount of diene is generally 0.5 to 10 weight percent, based on the weight of copolymer component (ii).

The copolymer component (ii) is soluble in xylene at room temperature and has an intrinsic viscosity [η] in tetrahydronaphthalene at 135° C. of 4 to 9, more preferably 5 to 8, and most preferably 5.5 to 7 dl/g.

The melt flow rate of component (d) as a whole is in the range of 0.1 to 40 g/10 min, more preferably 0.3 to 15 g/10 min, and even more preferably 0.5 to 10 g/10'.

Component (d) may be prepared by mechanically mixing components (i) and (ii) or may be obtained by sequential polymerization steps as described, for example, in US Pat. No. 6,586,531 B2, the relevant parts of which are incorporated by reference.

Optionally , inorganic fillers are present as another component (e), suitable inorganic fillers can be selected from the group consisting of talc, glass fiber, _CaCO3 , clay, carbon black, mica, among which talc is preferred, which can be, for example, unmodified and preferably uncoated or surface-treated. Talc can increase the character and strength of the polymer composition and the produced product, and preferably the size of the particles of talc is very small, with an average size of less than 5 μm.

The filler may be derived, in whole or in part, from filler present in the recycled component of the composition and/or may be added as fresh filler in the preparation of the polypropylene composition.

Generally, component (e) is preferably present in an amount ranging from 2 to 4 weight percent, based on the total weight of the polypropylene composition.

As an optional component (f), SEBS rubber can be used.

SEBS rubbers are (partially) hydrogenated styrene-butadiene-styrene block copolymers, these SEBS rubbers are in the styrene block copolymer (SBC) family, these polymers are triblock copolymers, with styrene at both ends of the polymer chain with internal polybutadiene, polyisoprene or hydrogenated polybutadiene or polyisoprene blocks.

SEBS copolymers are commercially available under the trade names Kraton and Tuftec, for example Kraton SEBS G1657MS.

When required, SEBS is present at 0.1 to 4 wt.%, preferably 0.2 to 3 wt.%, based on the total weight of the polypropylene composition.

The polypropylene composition may further contain 0.05 to 10% by weight, preferably 0.1 to 8% by weight, of additives.

Additives can include polyethylene (e.g., virgin HDPE or recycled HDPE), maleic anhydride grafted PE (PEMA), maleic anhydride grafted PP (PPMA), stabilizers, peroxides, calcium oxide (CaO) or colorants, and release agents.

Examples of PE include high density PE (HDPE), low density PE (LDPE), and linear low density PE (LLDPE).

PP-compatible acids with polar groups such as PPMA can be added.

PEMA, PE or PPMA can be added to the polymer composition at, for example, 0.1-2 wt%, preferably 0.2-1 wt%, more preferably 0.4-0.8 wt%.

Stabilizers can be added, such as the masterbatch Tosaf ME 833848, which is a mixture of about 70% by weight LDPE with a phenolic stabilizer (Irganox B225) and Irgafos; typically, such masterbatches are added in amounts between 0.2 and 1.5% by weight, preferably between 0.3 and 1.2% by weight.

Peroxides in the form of organic compounds or masterbatches can be added to improve the flow of the material and achieve the desired melt flow.

The peroxide can be selected from, for example, Zebraflow T028, Zebraflow T0214, or Zebraflow T0318, which are masterbatches of peroxide and polyolefin. The specific amount of peroxide can be determined by one skilled in the art considering the melt flow rates of the single components, the amounts of each, and the final desired melt flow rate. For example, the peroxide can comprise 2-10% by weight of the total additive package .

To suppress the release of HCl, CaO can be added, for example as a masterbatch with LDPE. CaO can be added in the range of 0-2 wt.%.

The black colorant may be added to the polymer composition, for example in the form of a masterbatch mixture, at 0.1-5 wt%, preferably 1-2 wt%.

Stripping agents are compounds used to remove volatiles during processing of the composition; BYK 4200 is one commercially available product.

The amount of the total additive package ranges from 0.5 to 7% by weight, preferably from 1 to 6% by weight , based on the total weight of the polypropylene composition.

In a preferred embodiment of the present disclosure,

(a) 52 % to 80 % by weight, preferably 55 % to 75 % by weight , more preferably 58 % to 70% by weight , of recycled polypropylene (r-PP);

(b) 8 to 30% by weight of recycled polyethylene;

(c) 4 % to 20 % by weight , preferably 5 % to 18% by weight , more preferably 6 % to 15% by weight , of a polyolefin elastomer (POE);

(d)

i) 20% to 90% by weight of a crystalline polypropylene component comprising a fraction A1 having a melt flow rate MFR ^I of 25 % to 75 % by weight of 0.5 to 10 g/10 min and a fraction A2 having a melt flow rate MFR ^II of 75 % to 25 % by weight of MFR II with MFR ^II /MFR ^I of 30 to 2000, said fractions A1 and A2 being independently selected from the group consisting of propylene homopolymers , propylene random copolymers containing up to 8% by weight of ethylene and propylene random copolymers containing up to 8% by weight of at least one C4 _- C10 _α -olefin, and

ii) a copolymer component of 10% to 80% by weight of ethylene and at least one C3 _- C10 _α -olefin, said copolymer comprising 10% to 70% by weight of ethylene and optionally a small amount of a diene, soluble in xylene at room temperature and having an intrinsic viscosity [η] of 4 to 9 dl/g;
3% to 12 % by weight , preferably 4 % to 10 % by weight, more preferably 5 % to 8 % by weight of a composition comprising
- 0.05 to 10% by weight, preferably 0.1 to 8% by weight of additives;

A polypropylene composition comprising:

The entire composition has a melt flow rate (ISO 1133 230°C/2.16 kg) value of 8.0 g/10' to 30.0 g/10', preferably 10 to 25.0 g/10', more preferably 12 to 20 g/10', the percentages of (a), (b), (c) and (d) being based on the total weight of the polypropylene composition.

According to the present disclosure, the range of curvature of the polypropylene composition is preferably 800-1400 MPa, preferably 810-1300 MPa.

The polypropylene composition preferably has a Charpy impact strength at 23° C. of 30 to 100 kJ/m ² , more preferably 40 to 80 kJ/m ² . The Charpy impact strength at -20° C. is in the range of 5 to 20 kJ/m ² , more preferably 6 to 15 kJ/m ² .

The composition of the present disclosure can exhibit a yield tensile strength of 15 MPa or more, a yield elongation of 10% or more, and a breaking tensile strength of 10 MPa or more.

The compositions of the present disclosure can be obtained by mechanically mixing components (a)-(d), and any other components and additives, according to conventional techniques.

The process for preparing the polymer composition may utilize a co-rotating twin screw tandem extruder to add component (ad) and any optional additives.

Additives can be added to the recovery extruder (first extruder) and the compound extruder (second extruder) of the tandem extruder.

The polypropylene polymer composition may be present in particulate or flake form to make the product.

The polypropylene polymer composition of the present disclosure, recycled PP, is suitable for making products for long-term use, such as boxes, trays, suitcases or everyday items.

Products made from the polymer composition are preferably made by injection molding or blow molding.

The following examples are provided for illustrative purposes and are not intended to limit the present disclosure.

Characteristic
Xylene soluble (XS) fraction at 25°C
2.5g polymer and 250ml xylene are introduced into a glass flask equipped with a chilled room and a magnetic stirrer, and after raising the temperature to the boiling point of the solvent within 30 minutes, the obtained clear solution is stirred under reflux for 30 minutes, and the sealed flask is kept in an ice water bath for 30 minutes, and then in a constant temperature water bath at 25°C for 30 minutes, the obtained solid is filtered through a quick filtering paper, 100ml of the filtered liquid is poured into a pre-weighed aluminum container, it is heated on a heating plate under nitrogen gas flow to remove the solvent by evaporation, and the container is kept in an oven at 80°C under vacuum until a constant weight is obtained, and the weight percentage of the polymer soluble in xylene at room temperature is calculated.

The content of the xylene soluble fraction is expressed as a percentage of the original 2.5 g, and the difference (added up to 100%) gives the xylene insoluble fraction (%).

The XS of components B) and C) can be calculated based on the following formula:

XStot=WaXSA+WbXSB+WcXSC

where Wa, Wb and Wc are the relative amounts of components A, B and C, respectively, and (A+B+C=1).
Melt Flow Rate (MFR)

Measured according to ISO 1133 at 230°C and 2.16 kg load, unless otherwise specified.
Intrinsic Viscosity (IV)

The sample is dissolved in tetrahydronaphthalene at 135°C and then poured into a capillary viscometer. The viscometer tube (Ubbelohde type) is surrounded by a cylindrical glass jacket, and this setup allows for temperature control using a circulating thermostatic liquid, and the downward passage of the meniscus is timed by a photoelectric device.

The passage of the meniscus in front of the upper ramp starts a counter equipped with a quartz crystal. When the meniscus passes the lower ramp, the counter is stopped and the flow time is recorded. This is converted to intrinsic viscosity according to the Huggins equation (Huggins, ML, J. Am. Chem. Soc., 1942, 64, 2716), assuming that the flow time of the pure solvent is known under the same test conditions (same viscometer and same temperature), and [η] is measured using one monopolymer solution.
Polydispersity Index:

The measurements are made at a temperature of 200°C using a parallel plate rheometer of type RMS-800 sold by RHEOMETRICS (USA), which operates at an oscillating frequency increasing from 0.1 rad/sec to 100 rad/sec. Based on the crossover factor, PI is derived by the following formula:
PI=105/Gc
where Gc is the crossover coefficient, defined as the value (expressed in Pa) for which G'=G'', where G' is the storage coefficient and G'' is the loss coefficient.
Ethylene (C2) Content

^13C NMR of propylene/ethylene copolymers.

¹³ C NMR spectra were collected on a cryoprobe-equipped Bruker AV-600 spectrometer operated at 120° C. in Fourier transform mode at a frequency of 160.91 MHz.

The S _ββ carbon (nomenclature "Monomer Sequence Distribution in Ethylene-Propylene Rubber Measured by 13C NMR. 3. Use of Reaction Probability Mode" CJ Carman, RA Harrington and CE Wilkes, Macromolecules 1977, 10, 536) peak at 29.9 ppm was used as an internal reference. Samples were dissolved in 1,1,2,2-tetrachloroethane d2 at a concentration of 8 wt/vol at 120 °C. Each spectrum was acquired with a 90° pulse to remove 1H-13C coupling with a 15 second delay between each pulse and CPD, and 512 transients were stored in 32K data points using a 9000 Hz spectral window.

Kakugo ("Carbon-13 NMR determination of monomer sequence distribution in ethylene-propylene copolymers prepared with δ-titanium trichloride- diethylaluminum chloride") M. Kakugo, Y. Naito, K. Mizunuma and T. Miyatake, "Large Molecules" 1982, 15, 1150) The spectrum is specified by the following formula, and the ternary group distribution and composition are evaluated.
PPP=100T _ββ /S PPE=100T _βδ /S EPE=100T _δδ /S
PEP=100S _ββ /S PEE=100S _βδ /S EEE=100(0.25Sγδ+0.5S _δδ )/S
S=T _ββ +T _βδ +T _δδ +S _ββ +S _βδ +0.25S _γδ +0.5S _δδ

The molar percentage of ethylene content is evaluated using the following formula:

E mole % = 100*[PEP+PEE+EEE]
The following formula is used to evaluate the weight percentage of ethylene content:

where P mole % is the molar percentage of propylene content, and _MWE and MWp are the molecular weights of ethylene and propylene, respectively.

Based on Carman (CJ Carman, RA Harrington and CE Wilkes, Large Molecules, 1977; 10, 536), the product of the reaction ratios r1 and r2 is calculated according to the following formula:

The structuring of the propylene sequences is based on the ratio of PPPmmT _ββ (28.90-29.65 ppm) to the total T _ββ (29.80-28.37 ppm) to calculate the mm content.

The ethylene C2 content of component b2 is obtained by measuring the C2 content in component B) and calculated by the formula C2tot=Xb1C2b1+Xb2C2b2, where Xb1 and Xb2 are the amounts of components b1 and b2 in the composition.
Mechanical test specimens

Samples were obtained in accordance with ISO 1873-2:2007.

Charpy impact test: Determined in accordance with ISO 179-leA and ISO 1873-2.

Yield elongation: Measured in accordance with ISO 527.

Breaking elongation: Measured in accordance with ISO 527.

Breaking stress: Measured in accordance with ISO 527.

Tensile modulus: Conforms to ISO 527-2 .
Melting and crystallization points

Melting points were measured using a DSC instrument according to ISO 11357-3 at a scan rate of 20 C/min under cooling and heating conditions with a sample weight of 5-7 mg in a flow of inert _N2 . The instrument was calibrated using indium.
Example

Production and evaluation of extrusion and injection molded products comply with ISO19069-2:2016, ISO294-1:2017 and ISO294-3:2002.

Material: Recycled PP
Recycled PE

The POE component (c) utilized is Infuse9077.

Component (d) is a composition prepared according to Example 4 of US Pat. No. 6,586,531 B2.

0.75% by weight of TOSAF is used as a stabilizer.

The additive package typically includes a stabilizer mixture (irgafos168/irganox1010), ZebraFlow T028 as a peroxide, and BYK4200 as a stripper.

表2-最終の組成物の性質

Comparative Example 1 utilizes the same composition as Example 1, except that component (d) is not utilized.
Table 1: Polymer composition of recycled PP (weight%)

Table 2 - Properties of the final composition

Based on the above data, the compositions based on the large amount of recycled materials disclosed herein provide an improved impact/stiffness balance over compositions in the prior art.

Claims (15)

(a) 52% to 80% recycled polypropylene (r-PP);
(b) 8 to 30% by weight of recycled polyethylene;
(c) 4% to 20% polyolefin elastomer (POE);
(d) i) 20 % to 90% by weight of a crystalline polypropylene component comprising a fraction A1 having a melt flow rate MFR ^I of 0.5 to 10 g/10 min and 25% to 75% by weight of a fraction A2 having a melt flow rate MFR ^II of 75 % to 25 % by weight with MFR ^II / MFR ^I of 30 to 2000, said fractions A1 and A2 being independently selected from the group consisting of propylene homopolymers, random copolymers of propylene containing up to 8% by weight of ethylene, and random copolymers of propylene containing up to 8% by weight of at least one C4 to C10 α _- olefin _;
ii) a copolymer component of 10% to 80% by weight of ethylene and at least one C3 _- C10 _α -olefin, said copolymer comprising 10% to 70% by weight of ethylene, soluble in xylene at 25°C, and having an intrinsic viscosity [η] of 4 to 9 dl/g;
3 % to 12% by weight of a composition comprising:
A polypropylene composition comprising :
The polypropylene composition as a whole has a melt flow rate (ISO 1133 230°C/2.16 kg) value in the range of 8.0 g/10 min to 30 g/10 min, the percentages of (a), (b), (c) and ( d) being based on the total weight of the polypropylene composition . Component (a) is in the range of 55 to 75% by weight;
Component (b ) is in the range of 10 to 25% by weight;
Component (c ) is in the range of 5 to 18 weight percent;
The polypropylene composition according to claim 1, characterized in that the component (d) is in the range of 4 to 10 wt%. 3. Polypropylene composition according to claim 1 or 2 , characterized in that it has a melt flow rate (ISO 1133 230°C/2.16 kg) in the range of 10 to 25 g/10 min. The polypropylene composition according to any one of claims 1 to 3, characterized in that the recycled polyethylene (r-PE) component ( b ) has a density in the range of 0.94 to 0.97 g/ ^cm3 and is present in an amount of 10 to 25 wt% of the total weight of the polypropylene composition. The polypropylene composition according to any one of claims ₁ to 4, characterized in that component (c) is an ethylene-α-olefin copolymer selected from C2- _C4 copolymers, _C2 - _C6 copolymers, _C2 - _C8 copolymers, the amount of ethylene being in the range of 70-80 wt % . 6. The polypropylene composition according to any one of claims 1 to 5, characterized in that component (c) has a density in the range of 0.85 to 0.89 g/cm3 ^and a melt flow rate (190°C/2.16 kg ISO 1133-1) of 0.3 to 1 g/10 min. 7. Polypropylene composition according to any one of claims 1 to 6, characterized in that component (d) contains 30 % to 80% by weight of component (i) and the MFR of fractions A1 and A2 is such that the MFR ^II /MFR ^I ratio is in the range of 40 to 2000. The polypropylene composition according to any one of claims 1 to 7, characterized in that the component (d) contains 20% by weight to 70% by weight of the component (ii), and the component (ii) has an intrinsic viscosity [ η ] of 5 to 8 dl/g measured in tetrahydronaphthalene at 135°C . The polypropylene composition according to any one of claims 1 to 8, characterized in that said component (ii) has an ethylene content in the range of 15 to 60 wt%. The polypropylene composition according to any one of claims 1 to 9, characterized in that the melt flow rate of the entire component (d) is in the range of 0.3 to 15 g/10 min. The polypropylene composition according to any one of claims 1 to 10, wherein the component (d) is present in an amount ranging from 4 to 10 wt% of the total weight of the polypropylene composition. The polypropylene composition according to any one of claims 1 to 11, further comprising, as component (f), an SEBS rubber in an amount of 0.1 to 4 wt%, based on the total weight of the polypropylene composition. 13. The polypropylene composition according to any one of claims 1 to 12, further comprising an additive package . The polypropylene composition according to any one of claims 1 to 13, characterized in that the polypropylene composition has a Charpy impact strength of 50 to 100 kJ/ ^m2 at 23 °C, a yield tensile strength of 15 MPa or more, a yield elongation of 10% or more, and a breaking tensile strength of 10 MPa or more. 15. An injection molded article made with the composition of any one of claims 1 to 14.