Patent US2993028A successfully refreshed from Google Patents.
US2993028A
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Isotactic polypropylene-polyisobutene blend and method for making same
Assignee: Montedison SpA
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Filing: 1958-05-26
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Granted: 1961-07-18
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Expires: 1978-05-26
Abstract
No abstract record available.
Inventors
- 👤 Ranalli Franco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:19
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; H; H01; H01J; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A THERMOPLASTIC COMPOSITION CONSISTING ESSENTIALLY OF A HOMOGENEOUS BLEND OF A SOLID POLYPROPYLENE MADE UP FOR AT LEAST 60% OF ISOTACTIC MACROMOLECULES, AND FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF SOLID POLYISOBUTENE, SAID COMPOSITION BEING CHARACTERIZED IN THAT THE TEMPERATURE AT WHICH IT BECOMES BRITTLE IS LOWER THAN THE TEMPERATURE AT WHICH THE POLYPROPYLENE NORMALLY EXHIBITS BRITTLENESS, AND IN HAVING GOOD IMPACT STRENGTH AT TEMPERATURES DOWN TO -32*C.
Claim 2
Dependent Claim
70 words
A THERMOPLASTIC COMPOSITION CONSISTING ESSENTIALLY OF A HOMOGENEOUS BLEND OF A SOLID POLYPROPYLENE MADE UP FOR AT LEAST 60% OF ISOTACTIC MACROMOLECULES, AND FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF SOLID POLYISOBUTENE, SAID COMPOSITION BEING CHARACTERIZED IN THAT THE TEMPERATURE AT WHICH IT BECOMES BRITTLE IS LOWER THAN THE TEMPERATURE AT WHICH THE POLYPROPYLENE NORMALLY EXHIBITS BRITTLENESS, AND IN HAVING GOOD IMPACT STRENGTH AT TEMPERATURES DOWN TO -32*C.
References Cited (Backward Citations)
US2615857A
Cited
US2791576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |