Patent US2556048A successfully refreshed from Google Patents.
US2556048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinylidene chloride and aliphatic epoxides
Assignee: Dow Chemical Co
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Filing: 1947-05-02
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Granted: 1951-06-05
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Expires: 1967-05-02
Abstract
No abstract record available.
Inventors
- 👤 Stanton George William
- 👤 Lowry Charles Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:12
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD WHICH COMPRISES DISPERSING IN AN AQUEOUS MEDIUM A POLYMERIZABLE MIXTURE CONSISTING OF FROM 25 TO 90 PER CENT OF MONOMERIC VINYLIDENE CHLORIDE, CORRESPONDINGLY FROM 75 TO 10 PERCENT OF THE MONOMER OF AN ALIPHATIC EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE; PROPYLENE OXIDE AND BUTADIENE MONOXIDE; AND A POLYMERIZATION CATALYST; SUBJECTING THE MIXTURE TO A POLYMERIZATION TEMPERATURE OF FROM 35* TO 60* C. WHILE MAINTAINING TH E POLYMERIZING MATERIAL IN DISPERSION UNTIL THE RESULTING COPOLYMER CONTAINS FROM 66 TO 98.5 PER CENT OF VINYLIDENE CHLORIDE AND CORRESPONDINGLY FROM 34 TO 1.5 PER CENT OF THE ALIPHATIC EPOXY COMPOUND COPOLYMERIZED THEREIN; AND SEPARATING FROM THE AQUEOUS MEDIUM THE SAID COPOLYMER WHICH IS CAPABLE OF BEING MOLDED AT A TEMPERATURE OF 135* C.
Claim 2
Independent Claim
126 words
THE METHOD WHICH COMPRISES DISPERSING IN AN AQUEOUS MEDIUM A POLYMERIZABLE MIXTURE CONSISTING OF FROM 25 TO 90 PER CENT OF MONOMERIC VINYLIDENE CHLORIDE, CORRESPONDINGLY FROM 75 TO 10 PERCENT OF THE MONOMER OF AN ALIPHATIC EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE; PROPYLENE OXIDE AND BUTADIENE MONOXIDE; AND A POLYMERIZATION CATALYST; SUBJECTING THE MIXTURE TO A POLYMERIZATION TEMPERATURE OF FROM 35* TO 60* C. WHILE MAINTAINING TH E POLYMERIZING MATERIAL IN DISPERSION UNTIL THE RESULTING COPOLYMER CONTAINS FROM 66 TO 98.5 PER CENT OF VINYLIDENE CHLORIDE AND CORRESPONDINGLY FROM 34 TO 1.5 PER CENT OF THE ALIPHATIC EPOXY COMPOUND COPOLYMERIZED THEREIN; AND SEPARATING FROM THE AQUEOUS MEDIUM THE SAID COPOLYMER WHICH IS CAPABLE OF BEING MOLDED AT A TEMPERATURE OF 135* C.
References Cited (Backward Citations)
US2176091A
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US2160943A
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US2380009A
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US2333634A
Cited
GB572767A
Cited
US2470324A
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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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |