Patent US2496864A successfully refreshed from Google Patents.
US2496864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion polymerization of styrene
Assignee: General Electric Co
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Filing: 1948-04-24
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Granted: 1950-02-07
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Expires: 1968-04-24
Abstract
No abstract record available.
Inventors
- 👤 Edmond F Fielder
- 👤 Glennard R Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:47
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; Y; Y10; Y10S; Y10S260/00; Y10S260/28; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF PRODUCING A CRYSTAL-CLEAR POLYSTYRENE FREE OF DICOLORATION AND HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST 90*C., WHICH METHOD COMPRISES HEATING AN EMULSIFIED MAS COMPRISING (1) STYRENE, (2) WATER, (3) AN ALKALI-METAL HYDROXIDE SUFFICIENT TO NEUTRALIZE AT LEAST 85 PER CENT OF THE FATTY ACID COMPONENT OF (4), (4) A FATTY ACID COMPONENT SELECTED FROM THE CLASS CONSISTING OF (A) MYRISTIC ACID, (B) PALMITIC ACID, (C) STEARIC ACID, AND (D) MIXTURES OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS HAVING AN EVEN NUMBER OF CARBON ATOMS AND CONTAINING FROM 12 TO 18 CARBON ATOMS WHOSE AVERAGE MOLECULAR WEIGHT IS EQUAL TO FROM AT LEAST 210 TO LESS THAN 284, SAID FATTY ACID COMPONENT BEING PRESENT IN AN AMOUNT EQUAL TO FROM 0.3 PER CENT UP TO AND INCLUDING 1 PER CENT, BY WEIGHT, BASED ON THE WEIGHT OF THE STYRENE, AND (5) A POLYMERIZATION CATALYST COMPRISING 1-HYDROXYCYCLOHEXYL HYDROPEROXIDE-1.
Claim 2
Independent Claim
148 words
THE METHOD OF PRODUCING A CRYSTAL-CLEAR POLYSTYRENE FREE OF DICOLORATION AND HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST 90*C., WHICH METHOD COMPRISES HEATING AN EMULSIFIED MAS COMPRISING (1) STYRENE, (2) WATER, (3) AN ALKALI-METAL HYDROXIDE SUFFICIENT TO NEUTRALIZE AT LEAST 85 PER CENT OF THE FATTY ACID COMPONENT OF (4), (4) A FATTY ACID COMPONENT SELECTED FROM THE CLASS CONSISTING OF (A) MYRISTIC ACID, (B) PALMITIC ACID, (C) STEARIC ACID, AND (D) MIXTURES OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS HAVING AN EVEN NUMBER OF CARBON ATOMS AND CONTAINING FROM 12 TO 18 CARBON ATOMS WHOSE AVERAGE MOLECULAR WEIGHT IS EQUAL TO FROM AT LEAST 210 TO LESS THAN 284, SAID FATTY ACID COMPONENT BEING PRESENT IN AN AMOUNT EQUAL TO FROM 0.3 PER CENT UP TO AND INCLUDING 1 PER CENT, BY WEIGHT, BASED ON THE WEIGHT OF THE STYRENE, AND (5) A POLYMERIZATION CATALYST COMPRISING 1-HYDROXYCYCLOHEXYL HYDROPEROXIDE-1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |