US3127385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing substantially
Assignee: —
•
Filing: 1958-01-03
•
Granted: 1964-03-31
•
Expires: 1978-01-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:50
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/30; C08; C08F; C08F6/00; C08F6/02; C07C2531/00; C07C2531/02; C07C2531/12; C07C2531/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
THE METHOD FOR SUBSTANTIALLY FREEING FROM RESIDUAL CATALYST A POLYPROPYLENE CONSISITNG PREDOMINANTLY OF ISOTACTIC POLYPROPYLENE AND OBTAINED BY POLYMERIZING PROPYLENE UNDER A LOW PRESSURE IN AN INERT HYDROCARBON DISPERSING AGENT FOR THE POLYMER AND IN CONATCT WITH CATALYSTS PREPARED BY (1) STARTING WITH A SOLID CRYSTALLAINE LOW VALENCY CHLORIDE OF A TRANSITION MEATALA BELONGING TO GROUPS IV TO VI INCLUSIVE OF THE MENDELEEF PERIODIC TABLE AND (2) MIXING THE TRANSITION METAL CHLORIDE WITH AN ALKYL COMPOUND OF A METAL BELONGING TO GROUPS II TO III INCLUSIVE OF SAID TABLE, AND HAVING A RESIDUAL CATALYST CONTENT NOT HIGHER THAN 1%, WHICH METHOD CONSISTS ESSENTIALLY OF THE STEPS OF FILTERING THE POLYPROPYLENE FROM THE DISPERSING AGENT, SUBJECTING THE FILTERED POLYMER TO STEAM DISTILLATION TO REMOVE COMPLETELY THE DISPERSING AGENT ADHERING TO IT AND HYDROLZYE THE CATALYST WITH CONVERSION OF THE CATALYST-FORMING COMPONENTS TO HYDROXIDES AND THE FORMATION OF HYDROCHLORIC ACID, LEACHING THE STEAM-TREATED POLYMER WITH A DILUTE AQUEOUS SOLUTION OF AMMONIA TO REMOVE THE ACID, AND HEATING THE LEACHED POLYMER UNDER VACUUM TO DRY THE SAME.
Claim 2
Independent Claim
174 words
THE METHOD FOR SUBSTANTIALLY FREEING FROM RESIDUAL CATALYST A POLYPROPYLENE CONSISITNG PREDOMINANTLY OF ISOTACTIC POLYPROPYLENE AND OBTAINED BY POLYMERIZING PROPYLENE UNDER A LOW PRESSURE IN AN INERT HYDROCARBON DISPERSING AGENT FOR THE POLYMER AND IN CONATCT WITH CATALYSTS PREPARED BY (1) STARTING WITH A SOLID CRYSTALLAINE LOW VALENCY CHLORIDE OF A TRANSITION MEATALA BELONGING TO GROUPS IV TO VI INCLUSIVE OF THE MENDELEEF PERIODIC TABLE AND (2) MIXING THE TRANSITION METAL CHLORIDE WITH AN ALKYL COMPOUND OF A METAL BELONGING TO GROUPS II TO III INCLUSIVE OF SAID TABLE, AND HAVING A RESIDUAL CATALYST CONTENT NOT HIGHER THAN 1%, WHICH METHOD CONSISTS ESSENTIALLY OF THE STEPS OF FILTERING THE POLYPROPYLENE FROM THE DISPERSING AGENT, SUBJECTING THE FILTERED POLYMER TO STEAM DISTILLATION TO REMOVE COMPLETELY THE DISPERSING AGENT ADHERING TO IT AND HYDROLZYE THE CATALYST WITH CONVERSION OF THE CATALYST-FORMING COMPONENTS TO HYDROXIDES AND THE FORMATION OF HYDROCHLORIC ACID, LEACHING THE STEAM-TREATED POLYMER WITH A DILUTE AQUEOUS SOLUTION OF AMMONIA TO REMOVE THE ACID, AND HEATING THE LEACHED POLYMER UNDER VACUUM TO DRY THE SAME.
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) | 1967-03-31 | 1967-09-30 | 1968-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-31 | 1971-09-30 | 1972-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-31 | 1975-09-30 | 1976-03-31 | $7700.00 | Window Closed / Lapsed |