EP0400333A2
Expired / Lapsed
EP
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Plasto-elastic polypropylene compositions
Assignee: Basell North America Inc
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Filing: 1990-04-27
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Granted: —
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Expires: 2010-04-27
Abstract
Abstract Polypropylene compositions having valued plasto-elastic properties, in the form of spheroidal flowable particles with an average diameter included between 500 and 7000 um having the following composition: A) 10-60 parts by weight of homopolymer polypropylene with isotactic index greater than 90, or of crystalline propylene copolymer with ethylene and/or an alpha olefin such as butene-1, pentene 1 or 4-methyl-1-pentene, containing over 85% by weight of propylene and having an isotactic index greater than 85; B) 10-40 parts by weight of a polymer fraction containing ethylene, insoluble in xylene at room temperature; C) 30-60 parts by weight of an amorphous copolymer ethylene-propylene fraction optionally containing small proportions of a diene, soluble in xylene at room temperature and containing 40-70% by weight of ethylene. y
Inventors
- 👤 Giuliano Cecchin
- 👤 Floriano Guglielmi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 03:07
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08F297/086; C08L23/16; C08L2205/00; C08L2205/03; C08L2207/00; C08L2207/02; C08L2207/10; C08L2207/14; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L2308/00; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
A polypropylene composition comprising: A) 10-60 parts by weight of homopolymer polypropylene with isotactic index greater than 90, or crystalline propylene copolymer with ethylene and/or with a CH₂=CHR olefin where R is a 2-6 carbon alkyl radical, containing over 85% by weight of propylene and having an isotactic index greater than 85; B) 10-40 parts by weight of a crystalline polymer fraction containing ethylene, insoluble in xylene at room temperature; C) 30-60 parts by weight, of an amorphous ethylene-propylene copolymer fraction containing optionally small proportions of a diene, soluble in xylene at room temperature and containing from 40 to 70% by weight of ethylene; said composition having a flex modulus smaller than 700 MPa, tension set at 75% less than 60%, tensile stress greater than 6 MPa and notched IZOD resilience at -20° and -40°C greater than 600 J/m.
Claim 2
Dependent Claim
139 words
A polypropylene composition comprising: A) 10-60 parts by weight of homopolymer polypropylene with isotactic index greater than 90, or crystalline propylene copolymer with ethylene and/or with a CH₂=CHR olefin where R is a 2-6 carbon alkyl radical, containing over 85% by weight of propylene and having an isotactic index greater than 85; B) 10-40 parts by weight of a crystalline polymer fraction containing ethylene, insoluble in xylene at room temperature; C) 30-60 parts by weight, of an amorphous ethylene-propylene copolymer fraction containing optionally small proportions of a diene, soluble in xylene at room temperature and containing from 40 to 70% by weight of ethylene; said composition having a flex modulus smaller than 700 MPa, tension set at 75% less than 60%, tensile stress greater than 6 MPa and notched IZOD resilience at -20° and -40°C greater than 600 J/m.
Claim 3
Dependent Claim
19 words
The composition of claim 1 where the total content of polymerized ethylene is between 20 and 60% by weight.
Claim 4
Dependent Claim
33 words
The composition of claim 1 or 2 where the flex modulus is between 200 and 500 MPa, the tension set between 20 and 50%, and the tensile stress between 8 and 20 MPa.
Claim 5
Dependent Claim
32 words
The composition of claim 1 in the form of spheroidal particles with average diameter between 500 and 7000 µm, flowability less than 30 seconds and tamped bulk density greater than 0.4 g/cc.
Claim 6
Dependent Claim
140 words
A process for the preparation of the composition of claim 1, comprising a polymerization stage of the propylene, or its mixtures with ethylene and/or alpha olefins, to form polymer phase A), and one or more stages of polymerization of ethylene-propylene mixtures containing optionally a diene to form polymer phases B) and C), using catalysts obtained from an Al-trialkyl compound and a solid component comprising an halide or halogen-alcoholate of Ti and an electron-donor compound supported on anhydrous magnesium chloride, said component having a surface area smaller than 100 m²/g, porosity between 0.2 and 0.4 cc/g, pore volume distribution such that over 50% of the pores have a radius greater than 100 Å, and presenting an X-ray spectrum with a halo with maximum intensity between angles 2 ϑ, of 33.5° and 35° and showing no reflections at 2 ϑ of 14.95°.
Claim 7
Dependent Claim
30 words
The process of claim 5, where the propylene polymerization stage is carried out in liquid monomer, and the stage, or stages, of ethylene-propylene copolymerization are carried out in gas phase.
Claim 8
Dependent Claim
10 words
The process of claim 5 carried out in gas phase.
Claim 9
Dependent Claim
10 words
A manufactured article obtained from the composition of claim 1.
References Cited (Backward Citations)
No citation records indexed.
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