Patent US3345352A successfully refreshed from Google Patents.
US3345352A
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Catalytic process for the thermal degradation of polyolefins
Assignee: Honeywell International Inc
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Filing: 1964-02-21
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Granted: 1967-10-03
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Expires: 1984-02-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph J Baron
- 👤 Julius P Rakus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:00
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; Y; Y10; Y10S; Y10S260/00; Y10S260/43; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE POLYOLEFIN THERMAL DEGRADATION PROCESS WHICH COMPRISES MIXING A CRYSTALLINE POLYOLEFIN WITH 0.075% TO 10% BY WEIGHT OF A DEGRADATION CATALYST FROM THE GROUP CONSISTING OF (1) OXIDES AND (2) CARBONATES OF (A) ALKALI METALS, (B) ALKALINE EARTH METALS, AND (C) HEAVY METALS FROM THE GROUP CONSISTING OF ANTIMONY, BISMUTH, CADMINUM, CHROMIUM, COPPER, IRON, LEAD, MERCURY, TANTALUM, TITANIUM, THALLIUM, VANADIUM AND ZINC, AND MIXTURES THEREOF; HEATING THE RESULTING MIXTURE IN AN ATMOSPHERE SUBSTANTIALLY FREE OF OXYGEN TO A TEMPERATURE OF FROM 275* TO 450*C. FOR A MINIMUM TIME PERIOD OF AT LEAST 5 MINUTES WHEN AT THE HIGHEST CATALYST CONCENTRATION, HIGHEST CATALYST DEGRADATION ACTIVITY, AND MOST ACTIVE TEMPERATURE CONDITIONS, SAID MINIMUM TIME INCREASING WITH DECREASING TEMPERATURE, CATALYST CONCENTRATION AND CATALYST DEGRADATION ACTIVITY; AND RECOVERING A POLYOLEFIN HAVING A MOLECULAR WEIGHT REDUCED BY AT LEAST 45% COMPARED TO THE MOLECULAR WEIGHT OF THE STARTING POLYOLEFIN.
Claim 2
Dependent Claim
144 words
THE POLYOLEFIN THERMAL DEGRADATION PROCESS WHICH COMPRISES MIXING A CRYSTALLINE POLYOLEFIN WITH 0.075% TO 10% BY WEIGHT OF A DEGRADATION CATALYST FROM THE GROUP CONSISTING OF (1) OXIDES AND (2) CARBONATES OF (A) ALKALI METALS, (B) ALKALINE EARTH METALS, AND (C) HEAVY METALS FROM THE GROUP CONSISTING OF ANTIMONY, BISMUTH, CADMINUM, CHROMIUM, COPPER, IRON, LEAD, MERCURY, TANTALUM, TITANIUM, THALLIUM, VANADIUM AND ZINC, AND MIXTURES THEREOF; HEATING THE RESULTING MIXTURE IN AN ATMOSPHERE SUBSTANTIALLY FREE OF OXYGEN TO A TEMPERATURE OF FROM 275* TO 450*C. FOR A MINIMUM TIME PERIOD OF AT LEAST 5 MINUTES WHEN AT THE HIGHEST CATALYST CONCENTRATION, HIGHEST CATALYST DEGRADATION ACTIVITY, AND MOST ACTIVE TEMPERATURE CONDITIONS, SAID MINIMUM TIME INCREASING WITH DECREASING TEMPERATURE, CATALYST CONCENTRATION AND CATALYST DEGRADATION ACTIVITY; AND RECOVERING A POLYOLEFIN HAVING A MOLECULAR WEIGHT REDUCED BY AT LEAST 45% COMPARED TO THE MOLECULAR WEIGHT OF THE STARTING POLYOLEFIN.
References Cited (Backward Citations)
US2981727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |