US3663663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin-ethylene/ester copolymer blend compositions
Assignee: Dow Chemical Co
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Filing: 1968-09-13
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Granted: 1972-05-16
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Expires: 1988-09-13
Abstract
Abstract A NEW POLYETHYLENE BLEND HAVING IMPROVED STRESS CRACKING PROPERTIES, SAID BLEND COMPRISING A HIGH MOLECULAR WEIGH POLYETHYLENE AND A COPOLYMER OF ETHYLENE AND AN ESTER COMONOMER, SUCH AS ETHYL ACRYLATED, ISOBUTYL ACRYLATE AND VINYL ACETATE, THE COPOLYMER HAVING A MOLECULAR WEIGHT BELOW 15,000 AND THE ESTER COMONOMER MOIETY IN THE RANGE FROM ABOUT 20 TO ABOUT 65 WEIGHT PERCENT. A METHOD FOR PREPARING SAID BLEND WHEREIN THE COPOLYMER IS INTRODUCED INTO THE POLYETHYLENE IN THE MOLTEN STATE AS IT PASSES FROM THE POLYMERIZATION ZONE.
Inventors
- 👤 Richard Bernie Mcada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0869
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |