US2999856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene waxes and process for preparing them
Assignee: Hoechst AG
•
Filing: 1958-12-09
•
Granted: 1961-09-12
•
Expires: 1978-12-09
Abstract
No abstract record available.
Inventors
- 👤 Bestian Herbert
- 👤 Lange Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR THE MANUFACTURE OF A LOW MOLECULAR, WAXY POLYETHYLENE HAVING A FLOWING/DROPPING POINT IN THE RANGE BETWEEN 100 AND 115*C., A MELT VISCOSITY AT 120*C. IN THE RANGE BETWEEN 100 AND 3000 CENTISTOKES AND A CRYSTALLINE PORTION BETWEEN 55 AND 75%, WHICH COMPRISES POLYMERIZING ETHYLENE WITH AN ADDITION OF 5 TO 30% BY VOLUME OF HYDROGEN (THE PERCENTAGE BEING CALCULATED ON THE MIXTURE OF ETHYLENE AND HYDROGEN) AT A TEMPERATURE IN THE RANGE BETWEEN 120 AND 180*C. AND A PRESSURE IN THE RANGE BETWEEN 300 TO 600 ATMOSPHERES GAUGE IN THE PRESENCE OF DI-TERT-BUTYL PEROXIDE CATALYST AND UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS.
Claim 2
Dependent Claim
103 words
A PROCESS FOR THE MANUFACTURE OF A LOW MOLECULAR, WAXY POLYETHYLENE HAVING A FLOWING/DROPPING POINT IN THE RANGE BETWEEN 100 AND 115*C., A MELT VISCOSITY AT 120*C. IN THE RANGE BETWEEN 100 AND 3000 CENTISTOKES AND A CRYSTALLINE PORTION BETWEEN 55 AND 75%, WHICH COMPRISES POLYMERIZING ETHYLENE WITH AN ADDITION OF 5 TO 30% BY VOLUME OF HYDROGEN (THE PERCENTAGE BEING CALCULATED ON THE MIXTURE OF ETHYLENE AND HYDROGEN) AT A TEMPERATURE IN THE RANGE BETWEEN 120 AND 180*C. AND A PRESSURE IN THE RANGE BETWEEN 300 TO 600 ATMOSPHERES GAUGE IN THE PRESENCE OF DI-TERT-BUTYL PEROXIDE CATALYST AND UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS.
References Cited (Backward Citations)
GB582334A
Cited
US2387755A
Cited
GB645088A
Cited
US2586322A
Cited
US2859190A
Cited
US2865903A
Cited
US2842508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |