Patent US4621119A successfully refreshed from Google Patents.
US4621119A
Expired / Lapsed
US
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Polypropylene-polyethylene-(ethylene-propylene rubber) compositions and films thereof with improved tear strength
Assignee: Mobil Oil AS
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Filing: 1984-12-27
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Granted: 1986-11-04
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Expires: 2004-12-27
Abstract
Abstract The tear strength of biaxially oriented polypropylene is improved by adding polyethylene, e.g., about 5-40 weight percent, and an ethylene propylene rubber, e.g., about 1-10 weight percent.
Inventors
- 👤 Pang-Chia Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:15
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08J; C08J5/00; C08J5/18; C08L23/12; C08J2323/00; C08J2323/02; C08J2323/10; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A biaxially oriented polypropylene film comprising (a) 51-94 weight percent of polypropylene; (b) 5-40 weight percent of a linear low density polyethylene (LLDPE) comprising a copolymer of ethylene and an aliphatic monoolefin having 4 to 8 carbon atoms; and (c) 1-10 weight percent of an ethylene-propylene rubber; said film having improved tear strength compared to the film absent the (b) and (c) components.
Claim 2
Dependent Claim
63 words
A biaxially oriented polypropylene film comprising (a) 51-94 weight percent of polypropylene; (b) 5-40 weight percent of a linear low density polyethylene (LLDPE) comprising a copolymer of ethylene and an aliphatic monoolefin having 4 to 8 carbon atoms; and (c) 1-10 weight percent of an ethylene-propylene rubber; said film having improved tear strength compared to the film absent the (b) and (c) components.
Claim 3
Dependent Claim
28 words
The film of claim 1 in which the proportions of (a), (b) and (c) are: (a) 65-89 weight percent; (b) 10-25 weight percent; and (c) 1-10 weight percent.
Claim 4
Dependent Claim
13 words
The film of claim 1 in which the monoolefin in (b) is 1-butene.
Claim 5
Dependent Claim
13 words
The film of claim 1 in which the monoolefin in (b) is 1-hexane.
Claim 6
Dependent Claim
13 words
The film of claim 1 in which the monoolefin in (b) is 1-octene.
Claim 7
Dependent Claim
13 words
The film of claim 3 in which the monoolefin in (b) is 1-butene.
Claim 8
Dependent Claim
13 words
The film of claim 3 in which the monoolefin in (b) is 1-hexene.
Claim 9
Dependent Claim
13 words
The film of claim 3 in which the monoolefin in (b) is 1-octene.
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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |