US3043817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of product control in aqueous suspension polymerizations of alkenyl aromatic compounds
Assignee: Dow Chemical Co
•
Filing: 1958-09-19
•
Granted: 1962-07-10
•
Expires: 1978-09-19
Abstract
No abstract record available.
Inventors
- 👤 Alex K Jahn
- 👤 Ernest J Gillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:25
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD OF CONTROLLING THE PARTICLE SIZE OF A POLYMERIC PRODUCT PRODUCED BY THE SUSPENSION POLYMERIZATION OF AN ALKENYL AROMATIC COMPOUND WHICH NORMALLY PASSES DURING POLYMERIZATION FROM A LIQUID TO A STICKY AGGLOMERATIVE STATE AND THENCE TO A NON-STICKY GRANULAR CONDITION, WHICH METHOD COMPRISES MAINTAINING A POLYMERIZATION TEMPERATURE BETWEEN 70* AND 120*C. IN A CONSTANTLY AGITATED AQUEOUS SUSPENSION COMPRISING A POLYMERIZABLE MONOMERIC ALKENYL AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOALKENYL AROMATIC COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
78 words
A METHOD OF CONTROLLING THE PARTICLE SIZE OF A POLYMERIC PRODUCT PRODUCED BY THE SUSPENSION POLYMERIZATION OF AN ALKENYL AROMATIC COMPOUND WHICH NORMALLY PASSES DURING POLYMERIZATION FROM A LIQUID TO A STICKY AGGLOMERATIVE STATE AND THENCE TO A NON-STICKY GRANULAR CONDITION, WHICH METHOD COMPRISES MAINTAINING A POLYMERIZATION TEMPERATURE BETWEEN 70* AND 120*C. IN A CONSTANTLY AGITATED AQUEOUS SUSPENSION COMPRISING A POLYMERIZABLE MONOMERIC ALKENYL AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOALKENYL AROMATIC COMPOUNDS HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-09 | 1966-01-08 | 1966-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-09 | 1970-01-08 | 1970-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-09 | 1974-01-08 | 1974-07-10 | $7700.00 | Window Closed / Lapsed |