Patent US3155644A successfully refreshed from Google Patents.
US3155644A
Expired / Lapsed
US
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Production of highly oxidized polyolefins
Assignee: WR Grace and Co
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Filing: 1961-10-26
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Granted: 1964-11-03
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Expires: 1981-10-26
Abstract
No abstract record available.
Inventors
- 👤 Kehr Clifton Leroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:46
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/26; C08L23/30; C08F; C08F8/00; C08F8/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A PROCESS FOR PRODUCING HIGHLY OXIDIZED POLYETHYLENE HAVING IMPROVED ADHESIVE PROPERTIES WHICH COMPRISES TREATING POLYETHYLENE HAVING A MELT INDEX IN THE RANGE OF ABOUT 0.0 TO 25 WITH A FREE OXYGEN-CONTAINING VAPOR AT A TEMPERATURE IN THE RANGE OF 100 TO 200*C. UNTIL THE POLYETHYLENE IS OXIDATIVELY DEGRADED TO A PRODUCT HAVING A HIGHER MELT INDEX IN THE RANGE OF ABOUT 5 TO 1000, QUENCHING THE OXIDATION PROCESS AND TREATING THE RESULTING PRODUCT WITH 0.5 TO 60 WEIGHT PERCENT OF A METALLIC BASE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, ALUMINUM BUTOXIDE, SODIUM METHYLATE AND CALCIUM HYDROXIDE AT A TEMPERATURE IN THE RANGE OF ABOUT 100 TO 180*C. UNTIL THE POLYETHYLENE IS CONVERTED TO A POLYMERIC METALLO-CARBOXYLATE WITH A MELT INDEX IN THE RANGE 0.1 TO 50 BY SALT FORMATION BETWEEN THE METALLIC CATION OF SAID METAL BASE AND THE CARBOXYL GROUPS OF THE OXIDIZED POLYETHYLENE.
Claim 2
Dependent Claim
147 words
A PROCESS FOR PRODUCING HIGHLY OXIDIZED POLYETHYLENE HAVING IMPROVED ADHESIVE PROPERTIES WHICH COMPRISES TREATING POLYETHYLENE HAVING A MELT INDEX IN THE RANGE OF ABOUT 0.0 TO 25 WITH A FREE OXYGEN-CONTAINING VAPOR AT A TEMPERATURE IN THE RANGE OF 100 TO 200*C. UNTIL THE POLYETHYLENE IS OXIDATIVELY DEGRADED TO A PRODUCT HAVING A HIGHER MELT INDEX IN THE RANGE OF ABOUT 5 TO 1000, QUENCHING THE OXIDATION PROCESS AND TREATING THE RESULTING PRODUCT WITH 0.5 TO 60 WEIGHT PERCENT OF A METALLIC BASE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, ALUMINUM BUTOXIDE, SODIUM METHYLATE AND CALCIUM HYDROXIDE AT A TEMPERATURE IN THE RANGE OF ABOUT 100 TO 180*C. UNTIL THE POLYETHYLENE IS CONVERTED TO A POLYMERIC METALLO-CARBOXYLATE WITH A MELT INDEX IN THE RANGE 0.1 TO 50 BY SALT FORMATION BETWEEN THE METALLIC CATION OF SAID METAL BASE AND THE CARBOXYL GROUPS OF THE OXIDIZED POLYETHYLENE.
References Cited (Backward Citations)
CA476476A
Cited
US2985617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |