Patent US3900534A successfully refreshed from Google Patents.
US3900534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic films based on blends of polypropylene and polybutene
Assignee: Mobil Oil AS
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Filing: 1973-05-07
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Granted: 1975-08-19
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Expires: 1993-05-07
Abstract
Abstract A biaxially oriented thermoplastic film structure formed from a resinous blend comprising polypropylene and polybutene, polybutene being present in an amount of more than 10% but less than 20% by weight, based upon the total weight of the blend.
Inventors
- 👤 Malcolm P Schard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:40
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/18; C08L23/20; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A HEAT SHRINKABLE BIXIALLY ORINTED THEROMPLASTIC FILM COMPRISING A RESINOUS MIXTURE CONTAINING: A. FROM ABOUT 82% TO ABOUT 88% BY WEIGHT OF A HIGH ISOTACTIC CONTENT POLYPROPYLENE RESIN, AND B. FROM ABOUT 12% TO ABOUT 18% BY WEIGHT OF A HIGH ISOTACTIC CONTENT POLYBUTENE RESIN, SAID FILM HAVING A THICKNESS OF FROM ABOUT 0.10 MIL UP TO ABOUT 10 MILS, SAID THEROMPLASTIC FILM BEING FURTHER CHARACTERIZED IN THAT IT HAS IMPROVED OPTICAL PROPERTIES IN COMPARISON TO FILM CONTAINING 20% BY WEIGHT OF SAID POLYBUTENE RESIN IN SAID MIXTURE AND IMPROVED HEAT SEAL STRENGTH CHARACTERISTICS IN COMPARSION TO FILMS CONTAINING 10% BY WEIGHT OF SAID POLYBUTENE IN SAID MIXTURE.
Claim 2
Dependent Claim
108 words
A HEAT SHRINKABLE BIXIALLY ORINTED THEROMPLASTIC FILM COMPRISING A RESINOUS MIXTURE CONTAINING: A. FROM ABOUT 82% TO ABOUT 88% BY WEIGHT OF A HIGH ISOTACTIC CONTENT POLYPROPYLENE RESIN, AND B. FROM ABOUT 12% TO ABOUT 18% BY WEIGHT OF A HIGH ISOTACTIC CONTENT POLYBUTENE RESIN, SAID FILM HAVING A THICKNESS OF FROM ABOUT 0.10 MIL UP TO ABOUT 10 MILS, SAID THEROMPLASTIC FILM BEING FURTHER CHARACTERIZED IN THAT IT HAS IMPROVED OPTICAL PROPERTIES IN COMPARISON TO FILM CONTAINING 20% BY WEIGHT OF SAID POLYBUTENE RESIN IN SAID MIXTURE AND IMPROVED HEAT SEAL STRENGTH CHARACTERISTICS IN COMPARSION TO FILMS CONTAINING 10% BY WEIGHT OF SAID POLYBUTENE IN SAID MIXTURE.
Claim 3
Dependent Claim
14 words
A film as defined in claim 1 which comprises a biaxially oriented film tube.
Claim 4
Dependent Claim
24 words
A film as defined in claim 1 which comprises about 85% by weight of said polypropylene and about 15% by weight of said polybutene.
References Cited (Backward Citations)
US3356765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |