US3257368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Shell USA Inc
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Filing: 1960-12-28
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Granted: 1966-06-21
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Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 De Loss E Winkler
- 👤 Nozaki Kenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:13
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR POLYMERIZATION OF PROPYLENE TO A HIGHLY CRYSTALLINE REACTION PRODUCT WHICH COMPRISES REACTING ALUMINUM TRIETHYL AND TITANIUM TETRACHLORIDE INA HYDROCARBON MEDIUM IN A MOLE RATION OF FROM 0.33:1 TO LESS THAN 0.4:1, AT ELEVATED TEMPERATURES AT LEAST UNTIL ALL THE ALUMINUM TRIETHYL IS OXIDIZED, ADDING THE RESULTING PRODUCT TO A REACTION MIXTURE CONTAINING PROPYLENE AS SOLE PLYMERIZABLE CONSTITUENT, SAID REACTION MIXTURE BEING MAINTAINED AT A TEMEPRATURE BELOW 100*C., AND SEPARATELY ADDING TO THE RESULTING REACTION MIXTURE SUFFICIENT ALUMINUM DIETHYL CHLORIDE TO PROVIDE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1.
Claim 2
Dependent Claim
95 words
A PROCESS FOR POLYMERIZATION OF PROPYLENE TO A HIGHLY CRYSTALLINE REACTION PRODUCT WHICH COMPRISES REACTING ALUMINUM TRIETHYL AND TITANIUM TETRACHLORIDE INA HYDROCARBON MEDIUM IN A MOLE RATION OF FROM 0.33:1 TO LESS THAN 0.4:1, AT ELEVATED TEMPERATURES AT LEAST UNTIL ALL THE ALUMINUM TRIETHYL IS OXIDIZED, ADDING THE RESULTING PRODUCT TO A REACTION MIXTURE CONTAINING PROPYLENE AS SOLE PLYMERIZABLE CONSTITUENT, SAID REACTION MIXTURE BEING MAINTAINED AT A TEMEPRATURE BELOW 100*C., AND SEPARATELY ADDING TO THE RESULTING REACTION MIXTURE SUFFICIENT ALUMINUM DIETHYL CHLORIDE TO PROVIDE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1.
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |