US2953556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer recovery process
Assignee: Goodrich Gulf Chemicals Inc
•
Filing: 1957-07-18
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Granted: 1960-09-20
•
Expires: 1977-07-18
Abstract
No abstract record available.
Inventors
- 👤 John S B Wolfe
- 👤 Floyd F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A METHOD OF RECOVERING A SOLID, RUBBERY, NORMALLYTACKY POLYMER OF A CONJUGATED DIENE HYDROCARBON, IN THE FORM A CRUMBS 1/64 TO 3/8 OF AN INCH IN DIAMETER, FROM A SOLUTION THEREOF IN A HYDROCARBON SOLVENT FORMING AN AZEOTROPIC BOILING MIXTURE WITH WATER COMPRISING THE STEPS, IN THE FOLLOWING ORDER, OF (1) MIXING THE SAID SOLUTION WITH WATER AND BETWEEN ABOUT 2 AND ABOUT 8% BY WEIGHT ON THE POLYMER IN SAID SOLUTION OF A WATER SOLUBLE FATTY ACID SOAP, (2) DISTILLING AWAY SAID SOLVENT AT A TEMPERATURE ABOVE ABOUT 45*C. AS AN AZEOTROPE WHILE AGITATING THE RESULTING MIXTURE, THE DISTILLATION IN WATER STEP BEING CARRIED OUT WITHOUT COOLING SAID MIXTURE BELOW ABOUT 45*C. AND THE AGITATION IN THE LATTER STEP BEING OF A MILD NATURE TO AVOID THE PRODUCTION OF A COLLOIDAL DISPERSION OF SAID SOLUTION IN SAID WATER, THEREBY TO PRODUCE MACRO-SIZED PARTICLES OF SOLVENT-FREE SOLID POLYMER 1/64 TO 3/8 INCH IN DIAMETER CARRIED IN A SOAPY AQUEOUS PHASE, AND (3) SEPARATING THE SAID PARTICLES FROM SAID AQUEOUS PHASE AT A TEMPERATURE ABOVE 45*C.
Claim 2
Independent Claim
175 words
A METHOD OF RECOVERING A SOLID, RUBBERY, NORMALLYTACKY POLYMER OF A CONJUGATED DIENE HYDROCARBON, IN THE FORM A CRUMBS 1/64 TO 3/8 OF AN INCH IN DIAMETER, FROM A SOLUTION THEREOF IN A HYDROCARBON SOLVENT FORMING AN AZEOTROPIC BOILING MIXTURE WITH WATER COMPRISING THE STEPS, IN THE FOLLOWING ORDER, OF (1) MIXING THE SAID SOLUTION WITH WATER AND BETWEEN ABOUT 2 AND ABOUT 8% BY WEIGHT ON THE POLYMER IN SAID SOLUTION OF A WATER SOLUBLE FATTY ACID SOAP, (2) DISTILLING AWAY SAID SOLVENT AT A TEMPERATURE ABOVE ABOUT 45*C. AS AN AZEOTROPE WHILE AGITATING THE RESULTING MIXTURE, THE DISTILLATION IN WATER STEP BEING CARRIED OUT WITHOUT COOLING SAID MIXTURE BELOW ABOUT 45*C. AND THE AGITATION IN THE LATTER STEP BEING OF A MILD NATURE TO AVOID THE PRODUCTION OF A COLLOIDAL DISPERSION OF SAID SOLUTION IN SAID WATER, THEREBY TO PRODUCE MACRO-SIZED PARTICLES OF SOLVENT-FREE SOLID POLYMER 1/64 TO 3/8 INCH IN DIAMETER CARRIED IN A SOAPY AQUEOUS PHASE, AND (3) SEPARATING THE SAID PARTICLES FROM SAID AQUEOUS PHASE AT A TEMPERATURE ABOVE 45*C.
References Cited (Backward Citations)
US2440498A
Cited
US2484614A
Cited
US2538273A
Cited
US2762790A
Cited
US2799662A
Cited
US2905659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |