US3157628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting gel formation in polyethylene by use of alpha-stage para-tertiaryalkylphenol-formaldehyde resins
Assignee: Union Carbide Corp
•
Filing: 1963-01-04
•
Granted: 1964-11-17
•
Expires: 1983-01-04
Abstract
No abstract record available.
Inventors
- 👤 Russell P Hill
- 👤 William J Tabar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:54
CPC Classifications
C; C08; C08F; C08F283/00; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A PROCESS FOR THE PRODUCTION OF SOLID POLYETHYLENE BY POLYMERIZATION OF ETHLENE WHEREIN A LONGITUDINALLY FLOWING MASS OF ETHYLENE AT ELEVATED TEMPERATURE AND PRESSURE AND IN CONTACT WITH A FREE-RADICAL INITIATOR IS MAINTAINED IN AN ELONGATED REACTION ZONE, EXTENDING FROM A REACTION ZONE INLET TO A REACTION ZONE OUTLET AT WHICH THE POLYMERIZATION REACTION PRODUCT IS WITHDRAWN, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO SAID ELONGATED REACTION ZONE WITHIN A REGION EXTENDING FROM ABOUT THE MID-POINT OF SAID ELONGATED REACTION ZONE TO SAID REACTION ZONE OUTLET A SMALL AMOUNT, SUFFICIENT TO REDUCE GEL FORMATION IN SAID SOLID POLYETHYLENE, OF AN A-STAGE PARATERTIARYALKYLPHENOL-FORMALDEHYDE RESIN WHEREIN THE TERTIARYALKYL GROUP OF THE PARA-TERTIARYALKYLPHENOL CONTAINS FROM 4 TO ABOUT 20 CARBON ATOMS.
Claim 2
Dependent Claim
118 words
IN A PROCESS FOR THE PRODUCTION OF SOLID POLYETHYLENE BY POLYMERIZATION OF ETHLENE WHEREIN A LONGITUDINALLY FLOWING MASS OF ETHYLENE AT ELEVATED TEMPERATURE AND PRESSURE AND IN CONTACT WITH A FREE-RADICAL INITIATOR IS MAINTAINED IN AN ELONGATED REACTION ZONE, EXTENDING FROM A REACTION ZONE INLET TO A REACTION ZONE OUTLET AT WHICH THE POLYMERIZATION REACTION PRODUCT IS WITHDRAWN, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO SAID ELONGATED REACTION ZONE WITHIN A REGION EXTENDING FROM ABOUT THE MID-POINT OF SAID ELONGATED REACTION ZONE TO SAID REACTION ZONE OUTLET A SMALL AMOUNT, SUFFICIENT TO REDUCE GEL FORMATION IN SAID SOLID POLYETHYLENE, OF AN A-STAGE PARATERTIARYALKYLPHENOL-FORMALDEHYDE RESIN WHEREIN THE TERTIARYALKYL GROUP OF THE PARA-TERTIARYALKYLPHENOL CONTAINS FROM 4 TO ABOUT 20 CARBON ATOMS.
References 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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |