Production of vinyl chloride polymer of predetermined particle size distribution and apparent density
Abstract
Abstract PRODUCTION OF A VINYL CHLORIDE POLYMER OF PREDETERMINED PARTICLE SIZE DISTRIBUTION AND APPARENT DENSITY BY SUBJECTING VINYL CHLORIDE TO POLYMERIZATION IN SUSPENSION, WHEREIN MONOMERIC VINYL CHLORIDE, PLACED IN A REACTOR, IS POLYMERIZED IN AQUEOUS DISPERSION, WITH AGITATION. MORE PARTICULARLY, THE VINYL CHLORIDE IS PRODUCED BY VARYING AT LEAST ONCE THE INITIAL STIRRING VELOCITY IN THE REACTOR DURING POLYMERIZATION AND CONDITIONAL UPON THE PARTICLE SIZE DISTRIBUTION DETERMINED FROM TIME TO TIME FOR THE POLYMER, THE INITIAL STIRRING VELOCITY BEING EITHER INCREASED WITH THE RESULTANT FORMATION OF A FINAL POLYMER CONTAINING AN INCREASED PROPORTION OF RELATIVELY COARSE PARTICLES, OR REDUCED WITH THE RESULTANT FORMATION OF A FINAL POLYMER CONTAINING AN INCREASED PROPORTION OF FINE PARTICLES, AND BY MAINTAINING THE VARIED STIRRING VELOCITY UNTIL COMPLETION OF THE POLYMERIZATION, IF NECESSARY OR CONVENIENT.
Inventors
- 👤 Arno Czekay
- 👤 Bruno Kramer
- 👤 Karl Kaiser
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |