US3144436A
Expired / Lapsed
US
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Process for degrading stereoregular polymers
Assignee: EIDP Inc
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Filing: 1961-01-04
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Granted: 1964-08-11
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Expires: 1981-01-04
Abstract
No abstract record available.
Inventors
- 👤 Greene Robert Eugene
- 👤 Pieski Edwin Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; C08K; C08K5/00; C08K5/04; C08K5/14; C08F2810/00; C08F2810/10; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR IMPROVING THE PROCESSIBILITY OF HIGH MOLECULAR WEIGHT STEREOREGULAR HYDROCARBON POLYMERS WHICH COMPRISES TREATING THE SAID POLYMER MELT IN THE ESSENTIAL ABSENCE OF OXYBEN IN A SCREW EXTRUDER, AT THE TEMPERATURE OF FROM THE MELTING POINT TO 100*C. ABOVE ITS MELTING POINT, WITH 0.005-0.5 WEIGHT, PERCENT OF A FREE RADICAL INITIATOR UNTIL THE MELT INDEX OF THE RESULTING STEREOREGULAR PRODUCT IS INCREASED FROM THE RANGE "NO-FLOW"-10 TO 0.1-100, UNDER THE CONDITIONS OF THE A.S.T.M. TEST NO D-1238-57T CONDITION E, WITH THE AMOUNT OF OXYGEN INTRODUCED INTO THE POLYMER DURING THE PROCESS BEING LESS THAN 0.2% OF ITS TOTAL WEIGHT.
Claim 2
Dependent Claim
101 words
A PROCESS FOR IMPROVING THE PROCESSIBILITY OF HIGH MOLECULAR WEIGHT STEREOREGULAR HYDROCARBON POLYMERS WHICH COMPRISES TREATING THE SAID POLYMER MELT IN THE ESSENTIAL ABSENCE OF OXYBEN IN A SCREW EXTRUDER, AT THE TEMPERATURE OF FROM THE MELTING POINT TO 100*C. ABOVE ITS MELTING POINT, WITH 0.005-0.5 WEIGHT, PERCENT OF A FREE RADICAL INITIATOR UNTIL THE MELT INDEX OF THE RESULTING STEREOREGULAR PRODUCT IS INCREASED FROM THE RANGE "NO-FLOW"-10 TO 0.1-100, UNDER THE CONDITIONS OF THE A.S.T.M. TEST NO D-1238-57T CONDITION E, WITH THE AMOUNT OF OXYGEN INTRODUCED INTO THE POLYMER DURING THE PROCESS BEING LESS THAN 0.2% OF ITS TOTAL WEIGHT.
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |