US5286564A
Expired / Lapsed
US
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Elastoplastic polyolefin compositions
Assignee: Himont Inc
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Filing: 1991-07-23
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Granted: 1994-02-15
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Expires: 2011-07-23
Abstract
Abstract Elastoplastic polyolefin compositions endowed with high flexibility, comprising: A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, another α-olefin, or combinations thereof, which copolymer contains over 85% by weight of propylene; B) 5-20 parts by weight of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature; C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another α-olefin, or combinations thereof, and, optionally, minor portions of a diene, said fraction containing less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being of from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4.
Inventors
- 👤 Giuliano Cecchin
- 👤 Floriano Guglielmi
- 👤 Anteo Pelliconi
- 👤 Emanuele Burgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:40
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08L; C08L2207/00; C08L2207/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
263 words
A polyolefin composition prepared by sequential polymerization in at least two stages comprising: (A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, a CH 2 ═CHR α-olefin where R is a 2-8 carbon alkyl radical or combinations thereof, which copolymer contains over 85% by weight of propylene and having an isotactic index greater than 80; (B) 5-20 parts by weight of a copolymer fraction of ethylene and propylene or another CH 2 ═CHR α-olefin, where R is a 2-8 carbon alkyl radical, or combinations thereof, containing greater than about 51% by weight ethylene, insoluble in xylene at ambient temperature; (C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another CH 2 ═CHR α-olefin, where R is a 2-8 carbon alkyl radical, or combinations thereof, and optionally, minor portions of a diene, said fraction containing from 20 to less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; wherein the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4, and said composition having a flexural modulus of less than 150 MPa, a tensile stress at break of from 10 to 20 Mpa, an elongation at break of higher than 400%, a tension set at 75% of from 20% to 50% and a haze of less than 40%.
Claim 2
Dependent Claim
263 words
A polyolefin composition prepared by sequential polymerization in at least two stages comprising: (A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, a CH 2 ═CHR α-olefin where R is a 2-8 carbon alkyl radical or combinations thereof, which copolymer contains over 85% by weight of propylene and having an isotactic index greater than 80; (B) 5-20 parts by weight of a copolymer fraction of ethylene and propylene or another CH 2 ═CHR α-olefin, where R is a 2-8 carbon alkyl radical, or combinations thereof, containing greater than about 51% by weight ethylene, insoluble in xylene at ambient temperature; (C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another CH 2 ═CHR α-olefin, where R is a 2-8 carbon alkyl radical, or combinations thereof, and optionally, minor portions of a diene, said fraction containing from 20 to less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; wherein the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4, and said composition having a flexural modulus of less than 150 MPa, a tensile stress at break of from 10 to 20 Mpa, an elongation at break of higher than 400%, a tension set at 75% of from 20% to 50% and a haze of less than 40%.
Claim 3
Dependent Claim
23 words
The polyolefin composition of claim 1, wherein the composition is in spheroidal particle form having an average diameter from 0.5 to 7 mm.
Claim 4
Dependent Claim
20 words
The polyolefin composition of claim 1, wherein the total content of copolymerized ethylene is from 15% to 35% by weight.
Claim 5
Dependent Claim
32 words
The polyolefin composition of claim 1, wherein the flexural modulus is less than 20 to 100 MPa, tension set at 75% is from 20% to 40%, and haze is less than 40%.
Claim 6
Dependent Claim
11 words
An injection molded article comprising the polyolefin composition of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |