US2848443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl gallates as short stopping agents for the emulsion polymerization of synthetic rubbers
Assignee: Phillips Petroleum Co
•
Filing: 1953-06-22
•
Granted: 1958-08-19
•
Expires: 1973-06-22
Abstract
No abstract record available.
Inventors
- 👤 Lawrence R Sperberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:29
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN THE PRODUCTION OF A SYNTHETIC RUBBER BY THE POLYMERIZATION IN AQUEOUS EMULSION OF A MONOMERIC MATERIAL COMPRISING A MAJOR PORTION OF BUTADIENE AND A MINOR PORTION OF STYRENE USING A MERCAPTAN AS A POLYMER MODIFIER AND A HYDROPEROXIDE CATALYST AT A TEMPERATURE IN THE RANGE OF -40 TO 70*C., THE IMPROVEMENT WHICH COMPRISES ADDING TO THE AQUEOUS EMULSION, WHEN BETWEEN 50 AND 80 PERCENT OF SAID MONOMERIC MATERIAL IS POLYMERIZED, DODECYL GALLATE IN AN AMOUNT OF 0.1 TO 1.5 PARTS PER 100 PARTS OF MONOMER SO AS TO TERMINATE SAID POLYMERIZATION.
Claim 2
Dependent Claim
92 words
IN THE PRODUCTION OF A SYNTHETIC RUBBER BY THE POLYMERIZATION IN AQUEOUS EMULSION OF A MONOMERIC MATERIAL COMPRISING A MAJOR PORTION OF BUTADIENE AND A MINOR PORTION OF STYRENE USING A MERCAPTAN AS A POLYMER MODIFIER AND A HYDROPEROXIDE CATALYST AT A TEMPERATURE IN THE RANGE OF -40 TO 70*C., THE IMPROVEMENT WHICH COMPRISES ADDING TO THE AQUEOUS EMULSION, WHEN BETWEEN 50 AND 80 PERCENT OF SAID MONOMERIC MATERIAL IS POLYMERIZED, DODECYL GALLATE IN AN AMOUNT OF 0.1 TO 1.5 PARTS PER 100 PARTS OF MONOMER SO AS TO TERMINATE SAID POLYMERIZATION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |