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US4424330A Expired / Lapsed US ⏱️ 0.0 years remaining

Ethylene-propylene copolymers

Assignee: Orkem SA
•
Filing: 1981-05-27
•
Granted: 1984-01-03
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Expires: 2001-05-27
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Abstract

Abstract A copolymer based on ethylene and propylene, having a density of between 0.933 and 0.946 g/cm 3 and a melt index of between 2 and 10 dg/min, wherein the copolymer has from 3 to 27 alkyl groups per 1000 carbon atoms in the molecule and wherein its density ρ and its proportion m of alkyl groups in the molecule satisfy the relationship 0.948≦ρ+0.71 m≦0.9525. The copolymer is produced by feeding a flux comprising from 80 to 95% by weight of ethylene and from 5 to 20% by weight of propylene into at least one reactor in stationary operation, the reactor having at least one reaction zone; and copolymerizing the ethylene and propylene in the reactor at a pressure of from 300 to 2500 bar and a temperature of from 180° to 320° C. in the presence of a Ziegler type catalyst system.

Inventors

  • 👤 Florent Raviola

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 21:17
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; Y; Y10; Y10S; Y10S526/00; Y10S526/916

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 60 words
An ethylene-propylene copolymer, having a density of between 0.933 and 0.946 g/cm 3 and a melt index of between 2 and 10 dg/min, wherein said copolymer has from 3 to 27 alkyl groups per 1000 carbon atoms in the molecule and wherein its density ρ and its proportion m of alkyl groups in the molecule satisfy the relationship: 0.948≦ρ+0.71 m≦0.9525.
Claim 2
Dependent Claim 60 words
An ethylene-propylene copolymer, having a density of between 0.933 and 0.946 g/cm 3 and a melt index of between 2 and 10 dg/min, wherein said copolymer has from 3 to 27 alkyl groups per 1000 carbon atoms in the molecule and wherein its density ρ and its proportion m of alkyl groups in the molecule satisfy the relationship: 0.948≦ρ+0.71 m≦0.9525.
Claim 3
Dependent Claim 19 words
A copolymer according to claim 1, wherein said copolymer further comprises units derived from α-olefinic monomers copolymerizable with ethylene.
Claim 4
Dependent Claim 21 words
A copolymer according to claim 1 or 2, wherein the molecular weight Mn of said copolymer is between 10,000 and 28,000.
Claim 5
Dependent Claim 18 words
A copolymer according to claim 1, wherein the polydisperse index of said copolymer is between 4 and 8.
Claim 6
Dependent Claim 26 words
A copolymer according to claim 1, wherein the break elongation of said copolymer, measured according to ISO Standard R 527, is at least equal to 1000%.
Claim 7
Dependent Claim 27 words
A copolymer according to claim 1, wherein the break resistance of said copolymer, measured according to ASTM Standard D 882-67, is higher than 200 kgf/cm 2 .
Claim 8
Dependent Claim 25 words
A copolymer according to claim 1, wherein the crack resistance of said copolymer, measured according to ASTM Standard D 1693-70, is higher than 15 hours.

References Cited (Backward Citations)

US3422055A Cited
GB1355245A Cited
US3981849A Cited
US4128607A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-01-02 1987-07-04 1988-01-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-01-02 1991-07-04 1992-01-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-01-02 1995-07-04 1996-01-03 $7700.00 Window Closed / Lapsed

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