Patent US3168506A successfully refreshed from Google Patents.
US3168506A
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US
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Process for polymerizing propylene wherein the titanium halide particle size is at least 150 microns
Assignee: WR Grace and Co
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Filing: 1961-07-06
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Granted: 1965-02-02
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Expires: 1981-07-06
Abstract
No abstract record available.
Inventors
- 👤 Donald F Hoeg
- 👤 Jr Abner Bartlett Stryker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:27
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; Y; Y10; Y10S; Y10S526/00; Y10S526/908; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE PROCESS WHICH COMPRISES POLYMERIZING LIQUID PROPYLENE TO A NORMALLY SOLID POLYMER IN A POLYMERIZATION ZONE AT A TEMPERATURE IN THE RANGE 20 TO 90*C., AND A PRESSURE IN THE RANGE 150 TO 690 P.S.I.A., IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF A TICL3 COMPOSITION AND DIETHYL ALUMINUM CHLORIDE, SAID TICL3 COMPOSITION HAVING THE FORMULA 3TICL3.ALCL3, THE IMPROVEMENT IN WHICH THE SAID TICL3 COMPOSITION HAS A PARTICLE SIZE OF AT LEAST ABOUT 150 MICRONS WITH EXCLUSION OF PARTICLES OF A SIZE LESS THAN 150 MICRONS, WHEREBY LARGE DISCRETE PLATELETS OF POLYMER ARE PRODUCED AND FOULING IN SAID ZONE IS SUBSTANTIALLY ELIMINATED.
Claim 2
Dependent Claim
104 words
IN THE PROCESS WHICH COMPRISES POLYMERIZING LIQUID PROPYLENE TO A NORMALLY SOLID POLYMER IN A POLYMERIZATION ZONE AT A TEMPERATURE IN THE RANGE 20 TO 90*C., AND A PRESSURE IN THE RANGE 150 TO 690 P.S.I.A., IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF A TICL3 COMPOSITION AND DIETHYL ALUMINUM CHLORIDE, SAID TICL3 COMPOSITION HAVING THE FORMULA 3TICL3.ALCL3, THE IMPROVEMENT IN WHICH THE SAID TICL3 COMPOSITION HAS A PARTICLE SIZE OF AT LEAST ABOUT 150 MICRONS WITH EXCLUSION OF PARTICLES OF A SIZE LESS THAN 150 MICRONS, WHEREBY LARGE DISCRETE PLATELETS OF POLYMER ARE PRODUCED AND FOULING IN SAID ZONE IS SUBSTANTIALLY ELIMINATED.
References Cited (Backward Citations)
US3010952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |