US4363904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High tear strength polymers
Assignee: Union Carbide Corp
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Filing: 1981-03-23
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Granted: 1982-12-14
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Expires: 2001-03-23
Abstract
Abstract Heterogeneous ethylene based hydrocarbon copolymers having high tear strength properties in film form, formed from ethylene, C 3-4 monomer and C 5-8 monomer with a molar ratio in the polymer of (C 3-4 /C 2 ) of about 0.006 to 0.09, a (C 5-8 /C 2 ) ratio of about 0.003 to 0.07 and having a Chain Branch Factor of about 0.2 to 0.8 and a narrow molecular weight distribution; a gas phase process for making such polymers, and film made from such polymers.
Inventors
- 👤 William A. Fraser
- 👤 Norma J. Maraschin
- 👤 Frederick J. Karol
- 👤 Alexander J. Makai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; Y; Y10; Y10S; Y10S526/00; Y10S526/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
An ethylene based hydrocarbon polymer comprising ethylene, C a monomer and C b monomer, wherein the C a monomer is selected from propylene, butene-1 and mixtures thereof, and the C b monomer is selected from one or more C 5 to C 8 alpha monoolefins which contain no branching closer than the fourth carbon atom the molar ratio in the polymer of (C a /C 2 ) is about 0.006 to 0.09 and the molar ratio of (C b /C 2 ) is about 0.003 to 0.07, and the Branch Chain Factor is about 0.2 to 0.8, and said polymer being heterogeneous and having a density of about 0.91 to 0.94, n-hexane extractables content at 50° C. of less than about 5.5 weight percent, melt index of about 0.5 to 5.0, M w /M n of about 2.7 to 4.3, and melt flow ratio of about 22 to 36.
Claim 2
Dependent Claim
149 words
An ethylene based hydrocarbon polymer comprising ethylene, C a monomer and C b monomer, wherein the C a monomer is selected from propylene, butene-1 and mixtures thereof, and the C b monomer is selected from one or more C 5 to C 8 alpha monoolefins which contain no branching closer than the fourth carbon atom the molar ratio in the polymer of (C a /C 2 ) is about 0.006 to 0.09 and the molar ratio of (C b /C 2 ) is about 0.003 to 0.07, and the Branch Chain Factor is about 0.2 to 0.8, and said polymer being heterogeneous and having a density of about 0.91 to 0.94, n-hexane extractables content at 50° C. of less than about 5.5 weight percent, melt index of about 0.5 to 5.0, M w /M n of about 2.7 to 4.3, and melt flow ratio of about 22 to 36.
Claim 3
Dependent Claim
12 words
A polymer as in claim 1 in which C a is propylene.
Claim 4
Dependent Claim
12 words
A polymer as in claim 1 in which C a is butene-1.
Claim 5
Dependent Claim
14 words
A polymer as in claim 2 or 3 in which C b is hexene-1.
Claim 6
Dependent Claim
28 words
A polymer as in claim 4 having a density of about 0.92 and an Elmendorf tear strength in compression molded film form of about 100 to 800 grams/mil.
Claim 7
Dependent Claim
8 words
Film formed from the polymer of claim 1.
Claim 8
Dependent Claim
8 words
Film formed from the polymer of claim 5.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |