US3159598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polyolefins
Assignee: Polysar Ltd
•
Filing: 1960-09-06
•
Granted: 1964-12-01
•
Expires: 1980-09-06
Abstract
No abstract record available.
Inventors
- 👤 Macfarlane Robert Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C2/04; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD OF STABILIZING RESIDUES OF HEAVY METAL CATALYST COMPOUNDS CONTAINED IN POLYISOPRENE PRODUCED WITH A CATALYST FORMED BY ADMIXING AN ALUMINUM TRIALKYL AND TITANIUM HALIDE WHICH COMPRISES TREATING THE POLYMER CONTAINING SAID CATALYST RESIDUES WITH AN AMOUNT OF A HYDRAZINE SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, METHYL, HYDRAZINE AND ETHYL HYDRAZINE, THE AMOUNT OF THE HYDRAZINE BEING AT LEAST THREE MOLES PER MOLE OF THE CATALYST RESIDUES PRESENT IN THE POLYMER, AND REMOVING THE UNREACTED EXCESS OF THE HYDRAZINE FROM THE POLYMER.
Claim 2
Independent Claim
84 words
THE METHOD OF STABILIZING RESIDUES OF HEAVY METAL CATALYST COMPOUNDS CONTAINED IN POLYISOPRENE PRODUCED WITH A CATALYST FORMED BY ADMIXING AN ALUMINUM TRIALKYL AND TITANIUM HALIDE WHICH COMPRISES TREATING THE POLYMER CONTAINING SAID CATALYST RESIDUES WITH AN AMOUNT OF A HYDRAZINE SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, METHYL, HYDRAZINE AND ETHYL HYDRAZINE, THE AMOUNT OF THE HYDRAZINE BEING AT LEAST THREE MOLES PER MOLE OF THE CATALYST RESIDUES PRESENT IN THE POLYMER, AND REMOVING THE UNREACTED EXCESS OF THE HYDRAZINE FROM THE POLYMER.
References Cited (Backward Citations)
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US1784838A
Cited
US2701241A
Cited
US2837536A
Cited
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Cited
FR1180634A
Cited
US2889310A
Cited
US3086000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |