US2556459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for copolymerizing styrene and alpha methyl styrene
Assignee: Monsanto Chemicals Ltd
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Filing: 1948-04-29
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Granted: 1951-06-12
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Expires: 1968-04-29
Abstract
No abstract record available.
Inventors
- 👤 George L Wesp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:28
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF PREPARING COPOLYMERS OF STYRENE WHICH COMPRISES REACTING FROM 30 TO 45 PERCENT BY WEIGHT OF ALPHA-METHYLSTYRENE AND 55 TO 70 PERCENT OF STYRENE IN AN AQUEOUS EMULSION IN WHICH THE RATIO OF MONOMER WEIGHT TO WATER WEIGHT IS MAINTAINED BETWEEN 0.1 AND 0.5 AND IN THE PRESENCE OF FROM 0.1 TO 5 PERCENT BY WEIGHT OF THE TOTAL MONOMERS OF AN EMULSION STABILIZER, MAINTAINING THE TEMPERATURE BETWEEN 80* C. AND 110* C., THROUGHOUT THE REACTION PERIOD OF FOUR TO 12 HOURS, ADDING FROM 0.02 TO 0.10 GRAM MOLECULAR WEIGHTS OF A WATER SOLUBLE PEROXY COMPOUND PER HOUR FOR EACH 100 POUNDS OF TOTAL MONOMERS, AND RECOVERING THE COPOLYMER.
Claim 2
Independent Claim
111 words
A METHOD OF PREPARING COPOLYMERS OF STYRENE WHICH COMPRISES REACTING FROM 30 TO 45 PERCENT BY WEIGHT OF ALPHA-METHYLSTYRENE AND 55 TO 70 PERCENT OF STYRENE IN AN AQUEOUS EMULSION IN WHICH THE RATIO OF MONOMER WEIGHT TO WATER WEIGHT IS MAINTAINED BETWEEN 0.1 AND 0.5 AND IN THE PRESENCE OF FROM 0.1 TO 5 PERCENT BY WEIGHT OF THE TOTAL MONOMERS OF AN EMULSION STABILIZER, MAINTAINING THE TEMPERATURE BETWEEN 80* C. AND 110* C., THROUGHOUT THE REACTION PERIOD OF FOUR TO 12 HOURS, ADDING FROM 0.02 TO 0.10 GRAM MOLECULAR WEIGHTS OF A WATER SOLUBLE PEROXY COMPOUND PER HOUR FOR EACH 100 POUNDS OF TOTAL MONOMERS, AND RECOVERING THE COPOLYMER.
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) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |