US3190852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefins stabilized with a combination of dialkyl thiodipropionates and polyphenols
Assignee: Shell USA Inc
•
Filing: 1962-07-31
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Granted: 1965-06-22
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Expires: 1982-07-31
Abstract
No abstract record available.
Inventors
- 👤 Marshall E Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/36; C08K5/37; C08K5/372
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
STABILIZED POLYPROPYLENE COMPOSITION COMPRISING (I) SOLID POLYMER CONSISTING SUBSTANTIALLY OF PROPYLENE PRODUCED BY A LOW-PRESSURE POLYMERIZATION PROCESS AND CONTAINING RESIDE OF A GROUP IV METAL COMPOUND, COMBINED WITH (II) UP TO 1 PERCENT BY WEIGHT OF AN INHIBITOR AGAINST THERMAL DEGRADATION THEREOF, CONSISTING OF A SYNERGISTIC COMBINATION OF (1) AT LEAST 0.05 PERCENT BY WEIGHT OF A DIALKYL BETA-THIODIPROPIONATE WHEREIN THE ALKYL GROUP CONTAINS FROM 12 TO 18 CARBON ATOMS, AND (2) AT LEAST 0.05 PERCENT BY WEIGHT OF 1,3,5-TRIMETHYL-2,4,6-TRI-(3,5-DI-TERT - BUTYL, - 4 - HYDROXYBENZYL) BENZENE, SAID COMPOUNDS (1) AND (2) BEING PRESENT IN A RATIO IN THE RANGE FROM 1:1 5:1, AND SAID PERCENTAGES BEING BASED ON THE WEIGHT OF POLYPROPYLENE.
Claim 2
Dependent Claim
113 words
STABILIZED POLYPROPYLENE COMPOSITION COMPRISING (I) SOLID POLYMER CONSISTING SUBSTANTIALLY OF PROPYLENE PRODUCED BY A LOW-PRESSURE POLYMERIZATION PROCESS AND CONTAINING RESIDE OF A GROUP IV METAL COMPOUND, COMBINED WITH (II) UP TO 1 PERCENT BY WEIGHT OF AN INHIBITOR AGAINST THERMAL DEGRADATION THEREOF, CONSISTING OF A SYNERGISTIC COMBINATION OF (1) AT LEAST 0.05 PERCENT BY WEIGHT OF A DIALKYL BETA-THIODIPROPIONATE WHEREIN THE ALKYL GROUP CONTAINS FROM 12 TO 18 CARBON ATOMS, AND (2) AT LEAST 0.05 PERCENT BY WEIGHT OF 1,3,5-TRIMETHYL-2,4,6-TRI-(3,5-DI-TERT - BUTYL, - 4 - HYDROXYBENZYL) BENZENE, SAID COMPOUNDS (1) AND (2) BEING PRESENT IN A RATIO IN THE RANGE FROM 1:1 5:1, AND SAID PERCENTAGES BEING BASED ON THE WEIGHT OF POLYPROPYLENE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |