Method of recovering copolymers
Abstract
Abstract MALEIC ANHYDRIDE AND ALIPHATIC 1-OLEFINS HAVING FROM 8 TO 18 CARBON ATOMS INCLUSIVE ARE COPOLYMERIZED IN THE PRESENCE OF A FREE RADICAL CATALYST AND AN EFFICIENT SOLVENT FOR BOTH THE MONOMERS AND THE RESULTING COPOLYMER, FOR EXAMPLE 1,1- OR 1,2-DICHLOROETHANE. ENOUGH SOLVENT IS EMPLOYED TO SOLUBILIZE NOT ONLY THE REACTANTS BUT ALSO THE COPOLYMER PRODUCTS TO GIVE SOLUTIONS OF MODERATE VISCOSITIES. THE PRODUCTS ARE THEN RECOVERED BY STEAM DISTILLATION UNTIL SOLVENT AND OTHER LIQUID MATERIALS ARE REMOVED, LEAVING MOLTEN COPOLYMER, WHICH IS THEN POURED ON A CHILLED METAL SURFACE ON WHICH THE POLYMER RAPIDLY SOLIDIFIES. THE STEAM STRIPPED COPOLYMERS ARE SUFFICIENTLY NON-TACKY AND BRITTLE SO THAT THEY ARE PARTED FROM THE METAL SURFACE AND BROKEN INTO CHUNKS BY BENDING OR INVERTING THE CHILLED SURFACE AND ALLOWING THE SOLID MATERIAL TO FALL FOR A SUBSTANTIAL DISTANCE INTO A CONTAINER.
Inventors
- 👤 F Galiano
- 👤 N Greenlee
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |