US3287301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of olefin polymers from solutions thereof
Assignee: Polysar Ltd
•
Filing: 1962-04-23
•
Granted: 1966-11-22
•
Expires: 1982-04-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Fysh
- 👤 Hugh K Coulthart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A METHOD OF RECOVERING SOLID CRUMBS OF AN OLEFIN POLYMER FROM A SLURRY OF SAID CRUMBS IN AN AQUEOUS MEDIUM, THE STEPS OF INTRODUCING INTO A SOLUTION OF SAID POLYMER IN AN INERT ORGANIC SOLVENT A MINOR PROPORTION UP TO ABOUT 1% BY WEIGHT OF THE RESULTANT DRY POLYMER PRODUCT OF A MIXTURE OF ROSIN ACID SELECTED FROM THE GROUP CONSISTING OF PRIMARIC ACID, ABIETIC ACID, ISOMERS OF ABIETIC ACID AND MIXTURES THEREOF AND A FATTY ACID HAVING FROM 18 TO 20 CARBON ATOMS THE SAID PROPORTION OF SAID MIXTURE INTRODUCED BEING SELECTED TO IMPROVE THE RESISTANCE OF SAID POLYMER TO DISCOLORATION ON AGING WHILE MAINTAINING A DESIRED AVERAGE SIZE OF SAID CRUMBS, AND SUBSEQUENTLY RAPIDLY MIXING THE SOLUTION WITH A HOT AQUEOUS MEDIUM TO EFFECT VOLATILISATION OF THE ORGANIC SOLVENT AND FORMATION OF THE SAID SLURRY.
Claim 2
Dependent Claim
138 words
IN A METHOD OF RECOVERING SOLID CRUMBS OF AN OLEFIN POLYMER FROM A SLURRY OF SAID CRUMBS IN AN AQUEOUS MEDIUM, THE STEPS OF INTRODUCING INTO A SOLUTION OF SAID POLYMER IN AN INERT ORGANIC SOLVENT A MINOR PROPORTION UP TO ABOUT 1% BY WEIGHT OF THE RESULTANT DRY POLYMER PRODUCT OF A MIXTURE OF ROSIN ACID SELECTED FROM THE GROUP CONSISTING OF PRIMARIC ACID, ABIETIC ACID, ISOMERS OF ABIETIC ACID AND MIXTURES THEREOF AND A FATTY ACID HAVING FROM 18 TO 20 CARBON ATOMS THE SAID PROPORTION OF SAID MIXTURE INTRODUCED BEING SELECTED TO IMPROVE THE RESISTANCE OF SAID POLYMER TO DISCOLORATION ON AGING WHILE MAINTAINING A DESIRED AVERAGE SIZE OF SAID CRUMBS, AND SUBSEQUENTLY RAPIDLY MIXING THE SOLUTION WITH A HOT AQUEOUS MEDIUM TO EFFECT VOLATILISATION OF THE ORGANIC SOLVENT AND FORMATION OF THE SAID SLURRY.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |