Polymers from essentially water-insoluble unsaturated liquid monomers and process for preparing same
Abstract
Abstract AN IMPROVEMENT IN THE PROCESS FOR PREPARING POLYMERS FROM SUBSTANTIALLY WATER-INSOLUBLE POLYMERICABLE ETHYLENICALLY UNSATURATED LIQUID MONOMER N AQUEOUS SUSPENSION WHEREIN SUCH MONOMERS FORM POLYMERS WHICH ARE INSOLUBLE IN THEIR MONOMER AND WHERE THE POLYMERIZATION IS FIRST CARRIED OUT BY FORMING AN INITIAL CONTINUOUS MONOMER PHASE WHICH IS THEN POLYMERIZED TO A MAXIMUM CONVERSION OF ABOUT 20 PERCENT AND THE POLYMERIZATION COMPLETED FOLLOWING THE ADDITION OF WATER IN AMOUNT SUFFICIENT TO FORM A MONOMER-IN-WATER PHASE; WHEREIN THE IMPROVEMENT CONSISTS OF CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF CERTAIN, NON-IONIC, MONOMER SOLUBLE SURFACE ACTIVE AGENTS WHICH PROVIDE FOR THE FORMATION OF POLYMERS COMPOSED OF INDIVIDUAL, UNIFORM, SUBSTANTIALLY SPHERICAL POROUS PARTICLES WHICH ARE DEVOID OF EXTERIOR PERICELLULAR LAYER.
Inventors
- 👤 Alfred R Nelson
- 👤 Vernon D Floria
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |