US2863849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butadiene-styrene copolymer-modified polystyrene molding compositions
Assignee: Monsanto Chemicals Ltd
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Filing: 1958-05-05
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Granted: 1958-12-09
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Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 James W L Fordham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:30
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L51/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A MOLDING COMPOSITION CONTAINING AS THE SOLE RESINOUS COMPONENT AN INTIMATE BINARY BLEND OF (A) 100 PARTS BY WEIGHT OF POLYSTYRENE HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 40,000-100,000, AS DETERMINED BY THE STAUDINGER EQUATION, AND (B) 1-50 PARTS BY WEIGHT OF A COPOLYMER OF ABOUT 30.90% BUTADIENE WITH, CORRESPONDINGLY, ABOUT 70-10% STYRENE, SUCH COPOLYMER HAVING BEEN PREPARED BY AN AQUEOUS EMULSION COPOLYMERIZATION REACTION WHEREIN (1) ALL OF ONE MONOMER IS EMULSIFIED IN WATER, (2) POLYMERIZATION OF SAID FIRST MONOMER IS INITIATED WITH A FREE-RADICAL GENERATING POLYMERIZATION INITIATOR, (3) 10-60% OF THE SECOND MONOMER IS ADDED TO THE POLYMERIZATION SYSTEM BEFORE MORE THAN 10% OF THE FIRST MONOMER IN POLYMERIZED, (4) POLYMERIZATION OF THE FIRST MONOMER IS CONTINUED IN THE CONTINUOUS PRESENCE OF THE SECOND MONOMER UNTIL 40-60% OF THE FIRST MONOMER IS POLYMERIZED, (5) THE BALANCE OF AT LEAST 40% OF THE SECOND MONOMER IS BASED TO THE POLYMERIZATION SYSTEM BEFORE MORE THAN 60% OF THE FIRST MONOMER IS POLYMERIZED AND (6) POLYMERIZATION IS CONTINUED UNTIL SUBSTANTIALLY ALL OF THE MONOMERS ARE POLYMERIZED.
Claim 2
Dependent Claim
174 words
A MOLDING COMPOSITION CONTAINING AS THE SOLE RESINOUS COMPONENT AN INTIMATE BINARY BLEND OF (A) 100 PARTS BY WEIGHT OF POLYSTYRENE HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 40,000-100,000, AS DETERMINED BY THE STAUDINGER EQUATION, AND (B) 1-50 PARTS BY WEIGHT OF A COPOLYMER OF ABOUT 30.90% BUTADIENE WITH, CORRESPONDINGLY, ABOUT 70-10% STYRENE, SUCH COPOLYMER HAVING BEEN PREPARED BY AN AQUEOUS EMULSION COPOLYMERIZATION REACTION WHEREIN (1) ALL OF ONE MONOMER IS EMULSIFIED IN WATER, (2) POLYMERIZATION OF SAID FIRST MONOMER IS INITIATED WITH A FREE-RADICAL GENERATING POLYMERIZATION INITIATOR, (3) 10-60% OF THE SECOND MONOMER IS ADDED TO THE POLYMERIZATION SYSTEM BEFORE MORE THAN 10% OF THE FIRST MONOMER IN POLYMERIZED, (4) POLYMERIZATION OF THE FIRST MONOMER IS CONTINUED IN THE CONTINUOUS PRESENCE OF THE SECOND MONOMER UNTIL 40-60% OF THE FIRST MONOMER IS POLYMERIZED, (5) THE BALANCE OF AT LEAST 40% OF THE SECOND MONOMER IS BASED TO THE POLYMERIZATION SYSTEM BEFORE MORE THAN 60% OF THE FIRST MONOMER IS POLYMERIZED AND (6) POLYMERIZATION IS CONTINUED UNTIL SUBSTANTIALLY ALL OF THE MONOMERS ARE POLYMERIZED.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |