US3041310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polystyrene-styrene copolymer molding compositions
Assignee: Shell USA Inc
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Filing: 1959-07-14
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Granted: 1962-06-26
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Expires: 1979-07-14
Abstract
No abstract record available.
Inventors
- 👤 Murray A Luftglass
- 👤 Peldon Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L25/08; C08L25/10; C08L53/00; C08L53/02; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A HIGH IMPART POLYSTYRENE MOLDING COMPOSITION COMPRISING AN INTIMATE MIXTURE OF (1) FROM ABOUT 50 TO ABOUT 95 PARTS BY WEIGHT OF POLYSTYRENE AND (2) FROM ABOUT 5 TO ABOUT 50 PARTS BY WEIGHT OF A COPOLYMER OF STYRENE AND AN ALIPHATE CONJUGATED DIENE SELECTED FROM THE GROUP CONSISTING OF BUTADIENE, ISOPRENE AND CHLOROPRENE IN A WEIGHT RATIO FROM ABOUT 1:2 TO 2:1 PARTS OF STYRENE TO THE SAID DIENE, THE SAID COPOLYMER BEING THE EMULSIFICATION COPOLYMERIZATION REACTION PRODUCT PREPARED BY POLYMERIZING THE CONJUGATED DIENE WHILE ADDING STYRENE IN A PLURALITY OF INVREMENTS DURING THE COPOLYMERIZATION REACTION, THE COPOLYMER BEING CROSSLINKED BY REACTING WITH DIVINYL BENZENE AFTER AT LEAST 30% BY WEIGHT OF THE TOTAL COMONOMERS ARE CONVERTED, THE CROSSLINKED COPOLYMER HAVING A GEL CONTENT BETWEEN 50 AND 100% MEASURED BY THE HARRIS-CAGE METHOD.
Claim 2
Dependent Claim
134 words
A HIGH IMPART POLYSTYRENE MOLDING COMPOSITION COMPRISING AN INTIMATE MIXTURE OF (1) FROM ABOUT 50 TO ABOUT 95 PARTS BY WEIGHT OF POLYSTYRENE AND (2) FROM ABOUT 5 TO ABOUT 50 PARTS BY WEIGHT OF A COPOLYMER OF STYRENE AND AN ALIPHATE CONJUGATED DIENE SELECTED FROM THE GROUP CONSISTING OF BUTADIENE, ISOPRENE AND CHLOROPRENE IN A WEIGHT RATIO FROM ABOUT 1:2 TO 2:1 PARTS OF STYRENE TO THE SAID DIENE, THE SAID COPOLYMER BEING THE EMULSIFICATION COPOLYMERIZATION REACTION PRODUCT PREPARED BY POLYMERIZING THE CONJUGATED DIENE WHILE ADDING STYRENE IN A PLURALITY OF INVREMENTS DURING THE COPOLYMERIZATION REACTION, THE COPOLYMER BEING CROSSLINKED BY REACTING WITH DIVINYL BENZENE AFTER AT LEAST 30% BY WEIGHT OF THE TOTAL COMONOMERS ARE CONVERTED, THE CROSSLINKED COPOLYMER HAVING A GEL CONTENT BETWEEN 50 AND 100% MEASURED BY THE HARRIS-CAGE METHOD.
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) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |