Polymerization of vinyl chloride and vinyl acetate to make a resin product
Abstract
Abstract THIS APPLICATION DISCLOSES A METHOD AND APPARATUS FOR THE CONTINUOUS POLYMERIZATION OF VINYL CHLORIDE WITH OTHER MONOMERS IN THE MANUFACTURE OF THERMOPLASTIC RESINS WHEREIN THE MONOMERS ARE COMBINED WITH A SOLVENT AND THE MIXTURE FORCED AT A PREDETERMINED SLOW RATE THROUGH A LONG TUBULAR REACTOR AT CONSTANTLY CONTROLLED PRESSURE AND TEMPERATURE CONDITIONS. THE POLYMER, UPON DISCHARGE FROM THE REACTOR, IS STRIPPED OF THE SOLVENT AND ANY REMAINING MONOMER OR OTHER VOLATILE, WHILE THE POLYMER IS BEING FORMED INTO A HOMOGENOUS SOLID, AS BY EXTRUSION OR DRUM DRYING. GENERALLY IT IS THEN PULVERIZED TO THE FORM IN WHICH IT IS COMMERICALLY SOLD. USUALLY A CATALYST IS ADDED TO THE MONOMER SOLVENT MIXTURE BEFORE THE MIXTURE ENTERS THE REACTOR.
Inventors
- 👤 Carlisle W Gilbert
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |