Patent US3138579A successfully refreshed from Google Patents.
US3138579A
Expired / Lapsed
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Method for preparing polyolefins of reduced ash content
Assignee: Texaco Inc
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Filing: 1960-12-22
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Granted: 1964-06-23
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Expires: 1980-12-22
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Cabaness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:45
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A METHOD FOR THE ORGANIC DILUENT POLYMERIZATION OF AN ALPHA OLEFIN IN THE PRESENCE OF A POLYMERIZATION CATALYST COMPRISING AN ALUMINUM ALKYL AND A TITANIUM HALIDE TO PREPARE A NORMALLY SOLID POLYMERIZED ALPHA OLEFIN, WHEREIN A REACTION MIXTURE IS OBTAINED COMPRISING SAID DILUENT, SAID CATALYST AND AN ASH-CONTAIING, NORMALLY SOLID POLYMERIZED ALPHA OLEFIN, THE IMPROVED METHOD FOR RECOVERING SAID NORMALLY SOLID POLYMERIZED ALPHA OLEFIN WHILE REDUCING THE ASH CONTENT THEREOF WHICH COMPRISES THE STEPS OF TREATING SAID REACTION MIXTURE WITH HYDROGEN FOR A PERIOD OF TIME WITHIN THE RANGE OF ABOUT 0.1 TO ABOUT 10 HOURS UNDER TREATING CONDITIONS INCLUDING FROM ABOUT 5 TO ABOUT 50 ATMOSPHERES OF HYDROGEN AND A TEMPERATURE WITHIN THE RANGE OF ABOUT 5* TO ABOUT 20*C. BELOW THE SOFTENING POINT OF SAID POLYMER ADDING A LIQUID ALCOHOL WASH COMPOUND TO SAID THUS-TREATED REACTION MIXTURE AND THEREAFTER RECOVERING SAID POLYMERIZED ALPHA OLEFIN.
Claim 2
Dependent Claim
147 words
IN A METHOD FOR THE ORGANIC DILUENT POLYMERIZATION OF AN ALPHA OLEFIN IN THE PRESENCE OF A POLYMERIZATION CATALYST COMPRISING AN ALUMINUM ALKYL AND A TITANIUM HALIDE TO PREPARE A NORMALLY SOLID POLYMERIZED ALPHA OLEFIN, WHEREIN A REACTION MIXTURE IS OBTAINED COMPRISING SAID DILUENT, SAID CATALYST AND AN ASH-CONTAIING, NORMALLY SOLID POLYMERIZED ALPHA OLEFIN, THE IMPROVED METHOD FOR RECOVERING SAID NORMALLY SOLID POLYMERIZED ALPHA OLEFIN WHILE REDUCING THE ASH CONTENT THEREOF WHICH COMPRISES THE STEPS OF TREATING SAID REACTION MIXTURE WITH HYDROGEN FOR A PERIOD OF TIME WITHIN THE RANGE OF ABOUT 0.1 TO ABOUT 10 HOURS UNDER TREATING CONDITIONS INCLUDING FROM ABOUT 5 TO ABOUT 50 ATMOSPHERES OF HYDROGEN AND A TEMPERATURE WITHIN THE RANGE OF ABOUT 5* TO ABOUT 20*C. BELOW THE SOFTENING POINT OF SAID POLYMER ADDING A LIQUID ALCOHOL WASH COMPOUND TO SAID THUS-TREATED REACTION MIXTURE AND THEREAFTER RECOVERING SAID POLYMERIZED ALPHA OLEFIN.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |