US3304281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of rubbery polymers
Assignee: Phillips Petroleum Co
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Filing: 1962-12-31
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Granted: 1967-02-14
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 John H Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:41
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
METHOD OF BLENDING A SOLUTION POLYMERIZED RUBBER OF CIS-POLYUBUTADIENE HAVING A CIS CONTENT OF AT LEST 75 PERCENT WITH AN EMULSION POLYMERIZED RUBBER, SAID EMULSION RUBBER BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOYLMERS OF CONJUGATTED DIENES CONTAINING 4 TO 8 CARBON ATOMS PER MOLECULE AND COPOLYMERS OF A MAJOR AMOUNT OF SAID CONJUGATED DIENES WITH A MINOR AMOUNT OF STYRENE, WHICH COMPRISES MIXING TOGETHER A POLYMER SOLUTION EFFIUENT STREAM FROM A SOLUTION POLYMERIZATION PROCESS AND A LATEX STREAM FROM AN EMULSION POLYMERIZATION PROCESS, IMMEDIATELY FEEDING THE RESULTING MIXTURE INTO A STRIPPING ZONE WHEREIN SOLVENT IS STRIPPED FROM SAID MIXTURE, MAINTAINING SAID MISTURE IN SAID STRIPPING ZONE UNDER ACIDCONDITIONS, AND RECOVERING A PRECIPITATED RUBBER CRUMB.
Claim 2
Dependent Claim
115 words
METHOD OF BLENDING A SOLUTION POLYMERIZED RUBBER OF CIS-POLYUBUTADIENE HAVING A CIS CONTENT OF AT LEST 75 PERCENT WITH AN EMULSION POLYMERIZED RUBBER, SAID EMULSION RUBBER BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOYLMERS OF CONJUGATTED DIENES CONTAINING 4 TO 8 CARBON ATOMS PER MOLECULE AND COPOLYMERS OF A MAJOR AMOUNT OF SAID CONJUGATED DIENES WITH A MINOR AMOUNT OF STYRENE, WHICH COMPRISES MIXING TOGETHER A POLYMER SOLUTION EFFIUENT STREAM FROM A SOLUTION POLYMERIZATION PROCESS AND A LATEX STREAM FROM AN EMULSION POLYMERIZATION PROCESS, IMMEDIATELY FEEDING THE RESULTING MIXTURE INTO A STRIPPING ZONE WHEREIN SOLVENT IS STRIPPED FROM SAID MIXTURE, MAINTAINING SAID MISTURE IN SAID STRIPPING ZONE UNDER ACIDCONDITIONS, AND RECOVERING A PRECIPITATED RUBBER CRUMB.
References Cited (Backward Citations)
US2953556A
Cited
US2986547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |