US4434264A
Expired / Lapsed
US
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High clarity propylene polymer compositions of improved impact strength
Assignee: El Paso Products Co
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Filing: 1983-03-22
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Granted: 1984-02-28
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Expires: 2003-03-22
Abstract
Abstract High clarity propylene polymer compositions having improved impact strength are comprised of a blend of a random copolymer of propylene and ethylene, containing from about 1 to about 6 wt % polymerized ethylene, with a linear low density polyethylene in a weight ratio range between about 80:20 and about 95:5. The linear low density polyethylene is a copolymer of ethylene and a C 4 -C 18 alpha-olefin and has a density in the range from about 0.910 to about 0.935 gms/cc.
Inventors
- 👤 Harold K. Ficker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:57
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A propylene polymer composition comprising (a) from about 80 to about 95 wt % of a random copolymer of propylene and ethylene containing from about 1 to about 6 wt % polymerized ethylene, and (b) from about 5 to about 20 wt % of a linear low density polyethylene copolymer of ethylene and at least one C 4 -C 18 alpha olefin comonomer, said copolymer having a density in the range from about 0.910 to about 0.935 gm/cc.
Claim 2
Dependent Claim
78 words
A propylene polymer composition comprising (a) from about 80 to about 95 wt % of a random copolymer of propylene and ethylene containing from about 1 to about 6 wt % polymerized ethylene, and (b) from about 5 to about 20 wt % of a linear low density polyethylene copolymer of ethylene and at least one C 4 -C 18 alpha olefin comonomer, said copolymer having a density in the range from about 0.910 to about 0.935 gm/cc.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein component (a) has a polymerized ethylene content of from about 1.5 to about 4 wt %.
Claim 4
Dependent Claim
26 words
The composition of claim 1 wherein component (a) has a melt flow in the range between about 1.0 and about 10 gm/10 min at 230° C.
Claim 5
Dependent Claim
19 words
The composition of claim 1 wherein the comonomer of component (b) is a C 4 -C 8 alpha olefin.
Claim 6
Dependent Claim
10 words
The composition of claim 4 wherein the comonomer is butene-1.
Claim 7
Dependent Claim
26 words
The composition of claim 1 wherein component (b) has a melt index in the range from about 0.5 to about 5 gm/10 min at 190° C.
Claim 8
Dependent Claim
30 words
The composition of claim 1 wherein component (b) is present in amounts ranging between about 8 and about 20 wt % based on the total weight of (a) and (b).
Claim 9
Dependent Claim
33 words
The composition of claim 1 containing between about 0.1 and about 2 wt % based on the total weight of (a) and (b) of a third component selected from clarifying or nucleating agents.
Claim 10
Dependent Claim
17 words
The composition of claim 8 wherein the third component is a benzoic acid salt or dibenzylidene sorbitol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |