US3219622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification and stabilization of poly-alpha-olefins
Assignee: Montedison SpA
•
Filing: 1962-05-11
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Granted: 1965-11-23
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Expires: 1982-05-11
Abstract
No abstract record available.
Inventors
- 👤 Luciani Luciano
- 👤 Manaresi Piero
- 👤 Bianchi Silvio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:14
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A PROCESS FOR THE PURIFICATION AND STABILIZATION OF HIGH MOLECULAR WEIGHT CRYSTALLINE LINEAR POLYPROPYLENE OBTAINED WITH A CATALYST OF A METALLORGANIC ALUMINUM COMPOUND AND A TITANIUM HALIDE, COMPRISING WASHING THE CRUDE POLYPROPYLENE WITH AN ALCOHOL CONTAINING DISSOLVED THEREIN A SUBSTITUTED ALIPHATIOC POLYHYDRIC ALCOHOL IN WHICH AT LEAST ONE HYDROGEN ATOM OF A HYDROXYL GROUP IS SUBSTITUTED WITH A METAL SELECTED FROM THE GROP CONSISTING OF ALKALI METALS AND ALKALINE EARTH METALS, THE AMOUNT OF SAID SUBSTITUTED ALCOHOL BEING AT LEAST SUFFICIENT TO ASSURE THE NEUTRALIZATION OF FREE ACID DEVELOPED BY DECOMPOSITION OF SAID CATALYST AND TO PROVIDE A RESIDUAL AMOUNT OF SAID SUBSTITUTED ALCOHOL OF FROM ABOUT 0.005 TO 1% BY WEIGHT OF SAYD POLYPROPYLENE, THE PRESENCE OF SAID RESIDUAL AMOUNT OF SAID SUBSTITUTED ALCOHOL SERVING TO STABILIZE SAID POLYPROPYLENE AGAINST COLORATION DUE TO THERMAL AND OXIDATIVE ACTION IN THE PRESENCE OF NORMALLY STAINING STABILIZERS.
Claim 2
Dependent Claim
145 words
A PROCESS FOR THE PURIFICATION AND STABILIZATION OF HIGH MOLECULAR WEIGHT CRYSTALLINE LINEAR POLYPROPYLENE OBTAINED WITH A CATALYST OF A METALLORGANIC ALUMINUM COMPOUND AND A TITANIUM HALIDE, COMPRISING WASHING THE CRUDE POLYPROPYLENE WITH AN ALCOHOL CONTAINING DISSOLVED THEREIN A SUBSTITUTED ALIPHATIOC POLYHYDRIC ALCOHOL IN WHICH AT LEAST ONE HYDROGEN ATOM OF A HYDROXYL GROUP IS SUBSTITUTED WITH A METAL SELECTED FROM THE GROP CONSISTING OF ALKALI METALS AND ALKALINE EARTH METALS, THE AMOUNT OF SAID SUBSTITUTED ALCOHOL BEING AT LEAST SUFFICIENT TO ASSURE THE NEUTRALIZATION OF FREE ACID DEVELOPED BY DECOMPOSITION OF SAID CATALYST AND TO PROVIDE A RESIDUAL AMOUNT OF SAID SUBSTITUTED ALCOHOL OF FROM ABOUT 0.005 TO 1% BY WEIGHT OF SAYD POLYPROPYLENE, THE PRESENCE OF SAID RESIDUAL AMOUNT OF SAID SUBSTITUTED ALCOHOL SERVING TO STABILIZE SAID POLYPROPYLENE AGAINST COLORATION DUE TO THERMAL AND OXIDATIVE ACTION IN THE PRESENCE OF NORMALLY STAINING STABILIZERS.
References Cited (Backward Citations)
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US2900373A
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US2919264A
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US2928815A
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |