WO1996020247A1 - CROSS-LINKED POLYMER COMPOSITION CONTAINING A POLYPROPYLENE-ETHYLENE COPOLYMER AND AN ETHYLENE-α-OLEFIN COPOLYMER - Google Patents

CROSS-LINKED POLYMER COMPOSITION CONTAINING A POLYPROPYLENE-ETHYLENE COPOLYMER AND AN ETHYLENE-α-OLEFIN COPOLYMER Download PDF

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Publication number
WO1996020247A1
WO1996020247A1 PCT/NL1995/000441 NL9500441W WO9620247A1 WO 1996020247 A1 WO1996020247 A1 WO 1996020247A1 NL 9500441 W NL9500441 W NL 9500441W WO 9620247 A1 WO9620247 A1 WO 9620247A1
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Prior art keywords
ethylene
polymer composition
cross
copolymer
propylene
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PCT/NL1995/000441
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French (fr)
Inventor
Johannes Fredericus Repin
Wilhelmus Gerardus Marie Bruls
Ivan CHODÁK
Igor CHORVÁTH
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Dsm N.V.
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Publication of WO1996020247A1 publication Critical patent/WO1996020247A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

Definitions

  • the invention relates to a cross-linked polymer composition containing 40-90 wt.% propylene-ethylene copolymer and 10-60 wt.% ethylene- ⁇ -olefin copolymer.
  • a polymer composition of this type is known from
  • cross-linked polymer composition containing propylene-ethylene copolymer and ethylene- ⁇ - olefin copolymer having a high impact resistance at low temperature and also has good flow properties.
  • a drawback of the polymer composition described above is that the stiffness of these products with a high impact resistance is too low.
  • the aim of the invention is to obtain a polymer composition that does not present the above drawback.
  • the invention is characteriezd in that the propylene-ethylene copolymer contains 8-20 wt.% ethylene, the ethylene- ⁇ -olefin copolymer contains 75-90 wt.% ethylene and has a density of 920-890 kg/m 3 and in that the polymer composition has a notched Izod impact strength
  • JP-A-61/85462 describes a cross-linked polymer composition containing 60-85 wt.% of a propylene-ethylene block copolymer and 15-40 wt.% of an ethylene- ⁇ -olefin random copolymer.
  • This polymer composition has, as the polymer composition according to DE-A-32,30,516, a high impact strength at low temperatures.
  • the cross-linked polymer composition according to JP-A-61/85462 has as a drawback that the stiffness of this product is too low. The stiffness of a polymer composition is reflected by the flexural modulus, determined according to ASTM D790.
  • the impact strength of a polymer composition is reflected by the notched Izod impact strength, determined according to ASTM D256.
  • the polymer composition has a notched Izod impact strength ⁇ 10 kJ/m 2 at -30°, determined according to ASTM D256.
  • propylene-ethylene copolymers are: random copolymers of propylene, ethylene and an ⁇ -olefin containing 4-10 carbon atoms, block copolymers of propylene, ethylene and an ⁇ -olefin containing 4-10 carbon atoms, and reactor mixtures a propylene homopolymer and ethylene homopolymer or ethylene copolymer containing ethylene and one or more ⁇ -olefins with 3-10 carbon atoms.
  • the propylene-ethylene copolymer is a propylene-ethylene block copolymer. Polymer compositions with the highest impact strength are obtained when a propylene-ethylene block copolymer is used in the polymer composition according to the invention.
  • the cross-linked polymer composition according to the invention also contains 10-60 wt.% ethylene- ⁇ - olefin copolymer relative to the total amount of propylene-ethylene copolymer and ethylene- ⁇ -olefin copolymer present.
  • 'Ethylene- ⁇ -olefin copolymer' is in the context of this invention understood to mean random copolymers of ethylene with one or more olefinic comonomers containing 3-10 carbon atoms, containing 75-90 wt.% ethylene with a density of 920-890 kg/m 3 .
  • the density of the ethylene- ⁇ -olefin copolymer is too low when the ethylene content in the ethylene- ⁇ - olefin copolymer is under 75 wt.%. Than also the stiffness of the crosslinked polymer composition decreases.
  • the impact resistance of the polymer composition at low temperatures decreases.
  • 1-butene, 1-hexene and/or 1-octene are used as ⁇ -olefin in the ethylene- ⁇ -olefin copolymer.
  • ethylene- ⁇ -olefin copolymers are low-density polyethylene (LDPE), very-low-density polyethylene (VLDPE) and ultra-low-density polyethylene (ULDPE) and linear-low-density polyethylene (LLDPE).
  • the cross-linked polymer composition according to the invention can be prepared by kneading and melting a mixture of the propylene-ethylene copolymer and the ethylene- ⁇ -olefin copolymer in the required ratio in the presence of a radical-forming agent and a cross-linking agent.
  • the radical-forming agent can be chosen from among peroxides or azo compounds.
  • peroxides are used.
  • peroxides are benzyl peroxide, t-butyl perbenzoate, t-butyl peracetate, t-butyl peroxyisopropylcarbonate, 2,5-dimethyl-2,5- di(benzoylperoxy)hexane, 2,5-dimethy1-2,5- di(benzoylperoxy)hexyn-3, t-butyl diperadipate, t-butyl peroxy-3,5,5-trimethylhexanoate, methylethylketone peroxide, cyclohexanone peroxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy)- hexane, 2,5-dimethyl-2 ,5-di(t-butylperoxy)
  • the amount of radical-forming agent present during the melting and kneading of the propylene-ethylene copolymer and the ethylene- ⁇ -olefin copolymer is usually between 0.01 and 3 wt.%, relative to the amount of propylene-ethylene copolymer plus ethylene- ⁇ -olefin copolymer.
  • the amount of radical-forming agent is 0.05-2 wt.%, relative to the amount of propylene- ethylene copolymer plus ethylene- ⁇ -olefin copolymer.
  • the cross-linking agent can be chosen from the group comprising compounds containing dihydroxy, divinyl, diallyl or triallyl containing compounds, such as 1,2-, 1,3- and 1,4-dihydroxybenzene, divinyl benzene or diallylphthalate.
  • 1,4-dihydroxybenzene is used as the cross-linking agent.
  • An amount of between 0.001 and 3 wt.% cross- linking agent, relative to the amount of propylene- ethylene copolymer plus ethylene- ⁇ -olefin copolymer, is usually present during the melting and kneading of the propylene-ethylene copolymer and the ethylene- ⁇ -olefin copolymer.
  • an amount of between 0.005 and 0.5 wt.% cross-linking agent is present.
  • a peroxide inhibitor is also present during the melting, kneading and mixing of the propylene- ethylene copolymer and the ethylene- ⁇ -olefin in the presence of a peroxide and a cross-linking agent.
  • the peroxide inhibitor ensures that the cross-linking reaction does not take place immediately when the melting and kneading are started. That way a good degree of mixing of the propylene-ethylene copolymer and the ethylene- ⁇ -olefin copolymer can be achieved before the cross-linking of the polymer composition takes place.
  • Various compounds may be used as the peroxide inhibitor, such as 1, -dihydroxybenzene, 2,6-di-t-butyl-p- cresol, t-butylcatechol, 4,4 '-butylidene-bis-(3-methyl-6- t-butylphenol) , 2,2 '-methylene-bis-(4-methyl-6-t- butylphenol) , 4,4 '-thio-bis(6-t-butyl-3-methylphenol) , mercaptobenzothiazole, dibenzothiazoledisulphide, 2,2,4- trimethyl-l,2-dihydroquinone polymers, phenyl- ⁇ - naphthylamine, N,N'-di- ⁇ -naphthyl-p-phenylenediamine and N-nitrosodiophenylamine.
  • the amount of peroxide inhibitor present during the melting and kneading of the polypropylene and the polyethylene is 0-0.5 wt.%, relative to the amount of propylene-ethylene copolymer plus ethylene- ⁇ -olefin copolymer.
  • both the cross-linking agent and the peroxide inhibitor are 1,4-dihydroxybenzene and between 0.005 and 0.5 wt.% 1, -dihydroxybenzene, relative to the amount of propylene-ethylene copolymer plus ethylene- ⁇ - olefin copolymer, is added.
  • the propylene-ethylene copolymer and ethylene- ⁇ - olefin copolymer are kneaded and melted together with the radical-forming agent, the cross-linking agent and optionally the peroxide inhibitor in the usual equipment, such as mixers, kneaders and single- or twin-screw extruders.
  • the temperature during the melting and kneading is 165 to 270°C.
  • the cross-linked polymer composition according to the invention may furthermore contain the usual additives such as fibres, fillers, nucleating agents, plasticizers, flame retardants, flow-promoting agents, lubricants, stabilisers and impact improving agents.
  • additives such as fibres, fillers, nucleating agents, plasticizers, flame retardants, flow-promoting agents, lubricants, stabilisers and impact improving agents.
  • the cross-linked polymer composition according to the invention is suitable for use large injection moulded parts for the automotive industry that are exposed to low temperatures, such as bumpers.
  • the impact strength (Izod) was determined according to ASTM D256.
  • the viscosity (SSV) was determined according to ASTM D3835 using a G ⁇ ttfert 1500 Viscotester at a shear rate of 115 s" 1 and a temperature of 240°C.
  • the diameter of the capillary tube was 1 mm, its length 30 mm and the entry angle was 180°C. The measurement was started after the material had been melted for 6 min.
  • the melt index (MI) was determined according to
  • the flexural modulus was determined according to
  • PE Ethylene- ⁇ -olefin copolymer
  • the polymer compositions were prepared by melting and kneading the various components in a Haake twin-screw extruder at a temperature of 175°C and a throughput of 20 g/min. TABLE 1

Abstract

The invention relates to a cross-linked polymer composition containing 40-90 wt.% propylene-ethylene copolymer with 8-20 wt.% ethylene and 10-60 wt.% ethylene-α-olefin copolymer with 75-90 wt.% ethylene and a density of 920-890 kg/m3, having a notched Izod impact strength » 10kJ/m2 at -20 °C and a flexural modulus higher than 500 MPa. The cross-linked polymer composition is prepared by melting and kneading propylene-ethylene copolymer and ethylene-α-olefin copolymer in the presence of a radical forming agent, a cross-linking agent and, eventually a peroxide inhibitor.

Description

CROSS-LINKED POLYMER COMPOSITION CONTAINING
A POLYPROPYLENE-ETHYLENE COPOLYMER AND
AN ETHYLENE-α-OLEFIN COPOLYMER
The invention relates to a cross-linked polymer composition containing 40-90 wt.% propylene-ethylene copolymer and 10-60 wt.% ethylene-α-olefin copolymer.
A polymer composition of this type is known from
DE-A-32,30,516.
Herein a cross-linked polymer composition is described containing propylene-ethylene copolymer and ethylene-α- olefin copolymer having a high impact resistance at low temperature and also has good flow properties.
A drawback of the polymer composition described above is that the stiffness of these products with a high impact resistance is too low. The aim of the invention is to obtain a polymer composition that does not present the above drawback. The invention is characteriezd in that the propylene-ethylene copolymer contains 8-20 wt.% ethylene, the ethylene-α-olefin copolymer contains 75-90 wt.% ethylene and has a density of 920-890 kg/m3 and in that the polymer composition has a notched Izod impact strength
> 10 kJ/m2 at -20°C and a flexural modulus of more than
500 MPa.
This ensures that the polymer composition is very suitable for use in moulded parts that have to show good impcat strength at low temperatures and also a high stiffness.
JP-A-61/85462 describes a cross-linked polymer composition containing 60-85 wt.% of a propylene-ethylene block copolymer and 15-40 wt.% of an ethylene-α-olefin random copolymer. This polymer composition has, as the polymer composition according to DE-A-32,30,516, a high impact strength at low temperatures. The cross-linked polymer composition according to JP-A-61/85462 has as a drawback that the stiffness of this product is too low. The stiffness of a polymer composition is reflected by the flexural modulus, determined according to ASTM D790.
The impact strength of a polymer composition is reflected by the notched Izod impact strength, determined according to ASTM D256. With particular preference the polymer composition has a notched Izod impact strength ≥ 10 kJ/m2 at -30°, determined according to ASTM D256.
When the polymer composition according to the invention is used in large moulded parts, such as car bumpers, it is also important that the polymer composition has good flow properties. Preferably the polymer composition has a viscosity of more than 550 Pa.s, determined according to ASTM D3835 at a shear rate of 115 s"1. The cross-linked polymer composition according to the invention that has this viscosity can readily be thermoplastically processed.
The cross-linked polymer composition according to the invention contains 40-90 wt.% propylene-ethylene copolymer relative to the total amount of propylene- ethylene copolymer and ethylene-α-olefin cpolymer present. 'Propylene-ethylene copolymer ' is within the context of this invention understood to mean: copolymers that containing 8-20 wt.% ethylene.
The compatibility of the propylene-ethylene copolymer with the ethylene-α-olefin copolymer is bad and the impact strength is low when the ethylene content in the ethylene-propylene copolymer is lower than 8 wt.%.
Examples of propylene-ethylene copolymers are: random copolymers of propylene, ethylene and an α-olefin containing 4-10 carbon atoms, block copolymers of propylene, ethylene and an α-olefin containing 4-10 carbon atoms, and reactor mixtures a propylene homopolymer and ethylene homopolymer or ethylene copolymer containing ethylene and one or more α-olefins with 3-10 carbon atoms. Preferably the propylene-ethylene copolymer is a propylene-ethylene block copolymer. Polymer compositions with the highest impact strength are obtained when a propylene-ethylene block copolymer is used in the polymer composition according to the invention.
The cross-linked polymer composition according to the invention also contains 10-60 wt.% ethylene-α- olefin copolymer relative to the total amount of propylene-ethylene copolymer and ethylene-α-olefin copolymer present. 'Ethylene-α-olefin copolymer' is in the context of this invention understood to mean random copolymers of ethylene with one or more olefinic comonomers containing 3-10 carbon atoms, containing 75-90 wt.% ethylene with a density of 920-890 kg/m3.
The density of the ethylene-α-olefin copolymer is too low when the ethylene content in the ethylene-α- olefin copolymer is under 75 wt.%. Than also the stiffness of the crosslinked polymer composition decreases.
The stiffness of the cross-linked polymer composition decreases till under 500 MPa when the ethylene content of the ethylene-α-olefin copolymer is under 890 kg/m3.
When the polyethylene has a density of more than 920 kg/m3 the impact resistance of the polymer composition at low temperatures decreases.
Preferably 1-butene, 1-hexene and/or 1-octene are used as α-olefin in the ethylene-α-olefin copolymer. Examples of ethylene-α-olefin copolymers are low-density polyethylene (LDPE), very-low-density polyethylene (VLDPE) and ultra-low-density polyethylene (ULDPE) and linear-low-density polyethylene (LLDPE). The cross-linked polymer composition according to the invention can be prepared by kneading and melting a mixture of the propylene-ethylene copolymer and the ethylene-α-olefin copolymer in the required ratio in the presence of a radical-forming agent and a cross-linking agent.
The radical-forming agent can be chosen from among peroxides or azo compounds. Preferably peroxides are used. Examples of peroxides are benzyl peroxide, t-butyl perbenzoate, t-butyl peracetate, t-butyl peroxyisopropylcarbonate, 2,5-dimethyl-2,5- di(benzoylperoxy)hexane, 2,5-dimethy1-2,5- di(benzoylperoxy)hexyn-3, t-butyl diperadipate, t-butyl peroxy-3,5,5-trimethylhexanoate, methylethylketone peroxide, cyclohexanone peroxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy)- hexane, 2,5-dimethyl-2 ,5-di(t-butylperoxy)hexyn-3, 1,3- bis-(t-butylperoxyisopropyl)benzene, t-butylcumyl peroxide, 1,l-bis-(t-butylperoxy)-3,3,5- trimethylcyclohexane, 1,1-bis-(t-butylperoxy)eyelohexane, 2,2-bis-(t-butylperoxy)-butane, p-menthane hydroperoxide, diisopropylbenzene hydroperoxide, cumene hydroperoxide, t- butyl hydroperoxide, p-cumene hydroperoxide, 1,1,3,3- tetramethylbutyl hydroperoxide and 2,5-dimethyl-2,5- di(hydroperoxy)hexane.
The amount of radical-forming agent present during the melting and kneading of the propylene-ethylene copolymer and the ethylene-α-olefin copolymer is usually between 0.01 and 3 wt.%, relative to the amount of propylene-ethylene copolymer plus ethylene-α-olefin copolymer. Preferably the amount of radical-forming agent is 0.05-2 wt.%, relative to the amount of propylene- ethylene copolymer plus ethylene-α-olefin copolymer.
The cross-linking agent can be chosen from the group comprising compounds containing dihydroxy, divinyl, diallyl or triallyl containing compounds, such as 1,2-, 1,3- and 1,4-dihydroxybenzene, divinyl benzene or diallylphthalate.
Preferably 1,4-dihydroxybenzene is used as the cross-linking agent. An amount of between 0.001 and 3 wt.% cross- linking agent, relative to the amount of propylene- ethylene copolymer plus ethylene-α-olefin copolymer, is usually present during the melting and kneading of the propylene-ethylene copolymer and the ethylene-α-olefin copolymer. Preferably an amount of between 0.005 and 0.5 wt.% cross-linking agent is present.
Preferably a peroxide inhibitor is also present during the melting, kneading and mixing of the propylene- ethylene copolymer and the ethylene-α-olefin in the presence of a peroxide and a cross-linking agent. The peroxide inhibitor ensures that the cross-linking reaction does not take place immediately when the melting and kneading are started. That way a good degree of mixing of the propylene-ethylene copolymer and the ethylene-α-olefin copolymer can be achieved before the cross-linking of the polymer composition takes place.
Various compounds may be used as the peroxide inhibitor, such as 1, -dihydroxybenzene, 2,6-di-t-butyl-p- cresol, t-butylcatechol, 4,4 '-butylidene-bis-(3-methyl-6- t-butylphenol) , 2,2 '-methylene-bis-(4-methyl-6-t- butylphenol) , 4,4 '-thio-bis(6-t-butyl-3-methylphenol) , mercaptobenzothiazole, dibenzothiazoledisulphide, 2,2,4- trimethyl-l,2-dihydroquinone polymers, phenyl-β- naphthylamine, N,N'-di-β-naphthyl-p-phenylenediamine and N-nitrosodiophenylamine.
The amount of peroxide inhibitor present during the melting and kneading of the polypropylene and the polyethylene is 0-0.5 wt.%, relative to the amount of propylene-ethylene copolymer plus ethylene-α-olefin copolymer.
Preferably both the cross-linking agent and the peroxide inhibitor are 1,4-dihydroxybenzene and between 0.005 and 0.5 wt.% 1, -dihydroxybenzene, relative to the amount of propylene-ethylene copolymer plus ethylene-α- olefin copolymer, is added.
The propylene-ethylene copolymer and ethylene-α- olefin copolymer are kneaded and melted together with the radical-forming agent, the cross-linking agent and optionally the peroxide inhibitor in the usual equipment, such as mixers, kneaders and single- or twin-screw extruders. The temperature during the melting and kneading is 165 to 270°C.
The cross-linked polymer composition according to the invention may furthermore contain the usual additives such as fibres, fillers, nucleating agents, plasticizers, flame retardants, flow-promoting agents, lubricants, stabilisers and impact improving agents.
The cross-linked polymer composition according to the invention is suitable for use large injection moulded parts for the automotive industry that are exposed to low temperatures, such as bumpers.
The invention will be further elucidated with reference to examples without the invention being limited thereto.
Examples
Measuring methods
The impact strength (Izod) was determined according to ASTM D256.
The viscosity (SSV) was determined according to ASTM D3835 using a Gδttfert 1500 Viscotester at a shear rate of 115 s"1 and a temperature of 240°C. The diameter of the capillary tube was 1 mm, its length 30 mm and the entry angle was 180°C. The measurement was started after the material had been melted for 6 min. The melt index (MI) was determined according to
ASTM D1238, at a temperature of 190°C and a pressure of
21.2 N.
The flexural modulus was determined according to
ASTM D790. The density was determined according to ASTM
D792. The materials used
Propylene-ethylene copolymer (PP):
Al) a propylene-ethylene block copolymer containing
9% ethylene. A2) a propylene-ethylene block copolymer containing
12% ethylene. A3) a propylene homopolymer
Ethylene-α-olefin copolymer (PE): Bl) VLDPE with 84 wt.% ethylene, a density of 911 kg/m3 and an MI of 2.2 g/10 min. B2) VLDPE with 89 wt.% ethylene a density of 919 kg/m3 and an MI of 2 .2 g/10 min. B3) HDPE with 99.5 wt.% ethylene, a density of 952 kg/m2 nd a MI of 10 g/10 min.
B4) ethylene-propylene-diene rubber with 65 wt.% ethylene and a density of 860 kg/m2 B5) ethylene-propylene rubber with 71 wt.% ethylene, a density of 880 kg/m2 and a MI of 0.4 g/10 min.
Radical-forming agent(R): Luperco 802PP40 Cross-linking agent (C): 1,4-dihydroxybenzene Peroxide inhibitor (P): 1,4-dihydroxybenzene
Examples I-X and Comparative Experiments A-D
The polymer compositions were prepared by melting and kneading the various components in a Haake twin-screw extruder at a temperature of 175°C and a throughput of 20 g/min. TABLE 1
Figure imgf000010_0001
NF = no fracture
TABLE 2 Comparative experiments A-H
Figure imgf000011_0001
NF = no fracture
15 ND = not determined

Claims

C L A I M S
1. Cross-linked polymer composition containing 40-90 wt.% propylene-ethylene copolymer and 10-60 wt.% ethylene-α-olefin copolymer, characterised in that the propylene-ethylene copolymer contains 8-20 wt.% ethylene, the ethylene-α-olefin copolymer contains 75-90 wt.% ethylene and has a density of 920-890 kg/m3 and in that the polymer composition has a notched Izod impact strength ≥ 10 kJ/m2 at -20°C and a flexural modulus of more than 500 MPa.
2. Cross-linked polymer composition according to Claim 1, characterized in that the polymer composition has a notched Izod impact strength ≥ 10 kJ/m2 at -30°C.
3. Cross-linked polymer composition according to Claim 1 or Claim 2, characterized in that the polymer composition has a viscosity of more than 550 Pa.s.
4. Cross-linked polymer composition according to any one of Claims 1-3, characte ized in that the propylene- ethylene copolymer is a propylene-ethylene block copolymer.
5. Cross-linked polymer composition according to any one of claims 1-4, characterised in that the α-olefin in the ethylene-α-olefin copolymer is 1-butene, 1-hexene and/or 1-octene.
6. Method for preparing the cross-linked polymer composition according to any one of Claims 1-5 by kneading and melting the propylene-ethylene copolymer and the ethylene-α-olefin copolymer in the presence of 0.05-1 wt.% peroxide and 0.005-0.5 a cross-linking agent.
7. Method according to Claim 6, characterized in that a peroxide inhibitor is also present.
8. Method according to Claim 7, characterized in that the peroxide inhibitor is 1,4-dihydroxybenzene.
9. Method according to any one of claim 6-8, characterized in that the cross-linking agent is 1,4- dihydroxybenzene.
10. Moulded part containing the cross-linked polymer composition according to any one of Claims 1-7.
11. Car bumper containing the cross-linked polymer composition according to any one of Claims 1-7.
PCT/NL1995/000441 1994-12-27 1995-12-21 CROSS-LINKED POLYMER COMPOSITION CONTAINING A POLYPROPYLENE-ETHYLENE COPOLYMER AND AN ETHYLENE-α-OLEFIN COPOLYMER WO1996020247A1 (en)

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BE9401165A BE1009007A3 (en) 1994-12-27 1994-12-27 Cross-linked polymer composition containing polypropylene and polyethene.
BE9401165 1994-12-27

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EP1186618A1 (en) * 2000-09-08 2002-03-13 ATOFINA Research Controlled rheology polypropylene heterophasic copolymers
EP1312617A1 (en) * 2001-11-14 2003-05-21 ATOFINA Research Impact strength polypropylene
US6593005B2 (en) 2000-01-24 2003-07-15 Dow Global Technologies Inc. Composition and films thereof
US6776924B2 (en) 2000-05-04 2004-08-17 Dow Global Technologies Inc. Molecular melt and methods for making and using the molecular melt
US6800669B2 (en) 2000-12-22 2004-10-05 Dow Global Technologies Inc. Propylene copolymer foams
US6939919B2 (en) 2000-05-26 2005-09-06 Dow Global Technologies Inc. Polyethylene rich/polypropylene blends and their uses

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