US2956982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polyethylene
Assignee: Eastman Kodak Co
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Filing: 1957-01-24
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Granted: 1960-10-18
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Expires: 1977-01-24
Abstract
No abstract record available.
Inventors
- 👤 Marvin A Mccall
- 👤 Jr Harry W Coover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:55
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/38; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PREPARING SOLID, HIGHLY POLYMERIC, STABILIZED POLYETHYLENE COMPRISING HEATING IN A REACTION VESSEL AT FROM 40* TO 350*C. UNDER FROM 50 TO 3,000 ATMOSPHERES OF PRESSURE THE FOLLOWING MATERIALS WHICH CONSTITUTE SUBSTANTIALLY THE ENTIRE INITIAL CONTENTS OF SAID REACTION VESSEL (1) ETHYLENE, (2) AS A STABILIZER FROM 0.01 TO 2% BASED ON THE WEIGHT OF THE POLYETHYLENE TO BE PRODUCED OF AT LEAST ONE ALKYL DIESTER OF 3,3''-THIODIPROPIONIC ACID WHEREIN EACH ALKYL RADICAL CONTAINS FROM 12 TO 18 CARBON ATOMS, AND (3) AN AMOUNT LESS THAN THE AMOUNT OF SAID STABILIZER OF A PEROXY CATALYST.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PREPARING SOLID, HIGHLY POLYMERIC, STABILIZED POLYETHYLENE COMPRISING HEATING IN A REACTION VESSEL AT FROM 40* TO 350*C. UNDER FROM 50 TO 3,000 ATMOSPHERES OF PRESSURE THE FOLLOWING MATERIALS WHICH CONSTITUTE SUBSTANTIALLY THE ENTIRE INITIAL CONTENTS OF SAID REACTION VESSEL (1) ETHYLENE, (2) AS A STABILIZER FROM 0.01 TO 2% BASED ON THE WEIGHT OF THE POLYETHYLENE TO BE PRODUCED OF AT LEAST ONE ALKYL DIESTER OF 3,3''-THIODIPROPIONIC ACID WHEREIN EACH ALKYL RADICAL CONTAINS FROM 12 TO 18 CARBON ATOMS, AND (3) AN AMOUNT LESS THAN THE AMOUNT OF SAID STABILIZER OF A PEROXY CATALYST.
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |