Process for the preparation of vinyl chloride polymers
Abstract
Abstract EMULSION TYPE POLYMERIZATION OF VINYL CHLORIDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF A POLYMERIZATION INITIATOR IS DIVIDED INTO TWSO STEPS; THE FIRST STEP OF POLYMERIZING MONOMERS TO PREPARE POLYMERS SUITABLE AS SEEDS AND THE SECOND STEP OF POLYMERIZING FRESH MONOMERS USING THE ABOVE POLYMERS AS SEEDS TO PRODUCE THE FINAL PRODUCT POLYMERS. AND IN EACH OF THE BOTH STEPS RESPECTIVELY, IS USED A SPECIFIED EMULSIFIER SYSTEM COMPRISING (A) A HIGHER FATTY ACID OF CARBON NUMBER OF 10-18, (B) A HIGH MOLECULAR SURFACE ACTIVE AGENT REPRESENTED BY THE FORMULA HO(CH2CH2O)M(CHCH3CH2O)P(CH2CH2O)NH AND (C) DISODIUM PHOSPHATE OR SODIUM BICARBONATE. THE FINAL PRODUCT POLYMERS REQUIRE NO SALTING-OUT PROCEDURE AND CAN BE READILY DEHYDRATED. AN THE POLYMERS CAN FORM A PLASTISOL WHICH SHOWS A VERY LOW VISCOSITY AND IS EXCELLENT IN AGE STABILITY, HEAT-STABILITY AND TRANSPARENCY. THUS THE PLOLYMERS ARE QUITE SUITABLE FOR PASTE RESINS.
Inventors
- 👤 Susumu Taima
- 👤 Shigeo Nakada
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |