Process for producing substantially ash-free polyolefin polymers
Abstract
Abstract TO PRODUCE A HIGHLY CRYSTALLINE POLYMER SUBSTANTIALLY FREE OF IMPURITIES. PROCESSES FOR POLYMERIZING ALPHA OLEFINIC HYDROCARBONS COMPRISING POLYMERIZING AN ALPHA OLEFIN WITH A SOLID STEREOSPECIFIC CATALYST IN THE PRESENCE OF A DILUENT WHICH IS A SOLVENT FOR THE POLY-ALPHA-OLEFIN AT THE REACTION TEMPERATURE TO PRODUCE A POLYMER SOLUTION CONTAINING CATALYST RESIDUES. THE POLYMER SOLUTION IS FILTERED TO REMOVE CATALYST REDISDUES. THE FILTERED SOLUTION IS CONTACTED WITH ALUMINA AND CONCENTRATED TO FORM A SOLID POLYMER CONCENTRATE CONTAINING RESIDUAL SOLVENT. PELLETS ARE FORMED OF THE POLYMER CONCENTRATE AND THE PELLETS EXTRACTED WITH A SOLVENT FOR AMORPHOUS LOW MOLECULAR WEIGHT POLYMER
Inventors
- 👤 Hugh J Hagemeyer Jr
- 👤 David C Hull
- 👤 Samuel J Park
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |