Patent US4192935A successfully refreshed from Google Patents.
US4192935A
Expired / Lapsed
US
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Ethylene polymers of high melt index
Assignee: DuPont Canada Inc
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Filing: 1979-01-02
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Granted: 1980-03-11
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Expires: 1999-01-02
Abstract
Abstract An ethylene polymer having a density in the range of about 0.940-0.960, a melt index in the range 100-200 and a ratio of weight-average molecular weight to number-average molecular weight of less than 5 is disclosed. The polymer is a copolymer of ethylene and at least one α-olefin having 4-10 carbon atoms e.g. butene-1, hexene-1 or octene-1. The preferred polymer is a copolymer of ethylene and butene-1. The polymers may be used in the injection molding of thin-wall containers e.g. containers having a wall thickness of less than 0.7 mm, especially a thickness of less than 0.5 mm and in particular a thickness of less than 0.4 mm.
Inventors
- 👤 Peter J. Lovell
- 👤 Ian C. B. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:40
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; B; B29; B29C; B29C45/00; B29C45/0001; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
An ethylene polymer having a density in the range of about 0.940-0.960, a melt index in the range 100-200 and a ratio of weight-average molecular weight to number-average molecular weight of less than 5, said polymer being a copolymer of ethylene and at least one α-olefin having 4-10 carbon atoms, the α-olefin being an aliphatic hydrocarbon.
Claim 2
Dependent Claim
56 words
An ethylene polymer having a density in the range of about 0.940-0.960, a melt index in the range 100-200 and a ratio of weight-average molecular weight to number-average molecular weight of less than 5, said polymer being a copolymer of ethylene and at least one α-olefin having 4-10 carbon atoms, the α-olefin being an aliphatic hydrocarbon.
Claim 3
Dependent Claim
15 words
The polymer of claim 1 in which the melt index is in the range 100-150.
Claim 4
Dependent Claim
21 words
The polymer of claim 2 in which the ratio of weight-average molecular weight to number-average molecular weight is less than 3.5.
Claim 5
Dependent Claim
21 words
The polymer of claim 3 in which the polymer is a copolymer of ethylene and an α-olefin having 4-8 carbon atoms.
Claim 6
Dependent Claim
16 words
The polymer of claim 3 in which the polymer is a copolymer of ethylene and butene-1.
References Cited (Backward Citations)
CA856137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |