US3480567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of a vicinal alkylene oxide using a novel organometallic compound-polyol cocatalyst
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1962-05-23
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Granted: 1969-11-25
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Expires: 1982-05-23
Abstract
No abstract record available.
Inventors
- 👤 Yutaka Matsui
- 👤 Norishige Hashimoto
- 👤 Noritoshi Mise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:23
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A CATALYST FOR THE POLYMERIZATION OF VICINAL ALKYLENE OXIDES WHICH IS THE PRODUCT OF THE REACTION IN AN INERT GAS, IN THE PRESENCE OF A SUITABLE SOLVENT, AND, AT A TEMPERATURE WHICH IS MAXIMALLY AMBIENT, OF DI(LOWER) ALKYL ZINC WITH POLYHYDRIC THIALCHOHOL FREE OF INTERFERING FUNCTIONAL GROUPS, THE LATTER BEING PRESENT IN AN AMOUNT OF ABOUT 0.05 TO 2 MOLES PER MOLE OF DIALKYL ZINC.
Claim 2
Dependent Claim
65 words
A CATALYST FOR THE POLYMERIZATION OF VICINAL ALKYLENE OXIDES WHICH IS THE PRODUCT OF THE REACTION IN AN INERT GAS, IN THE PRESENCE OF A SUITABLE SOLVENT, AND, AT A TEMPERATURE WHICH IS MAXIMALLY AMBIENT, OF DI(LOWER) ALKYL ZINC WITH POLYHYDRIC THIALCHOHOL FREE OF INTERFERING FUNCTIONAL GROUPS, THE LATTER BEING PRESENT IN AN AMOUNT OF ABOUT 0.05 TO 2 MOLES PER MOLE OF DIALKYL ZINC.
Claim 3
Independent Claim
55 words
A METHOD FOR POLYMERIZING VICINAL ALKYLENE OXIDES, WHICH COMPRISES CONTACTING UNDER POLYMERIZING CONDITIONS A MONOMERIC VICINAL ALKYLENE OXIDE FREE OF INTERFERING FUNCTIONAL GROUPS WITH ABOUT 0.01 TO 1 PERCENT BY WEIGHT, RELATIVE TO SAID ALKYLENE OXIDE, OF A POLYMERIZATION CATALYST CONSISTING OF THE PRODUCT OF THE REACTION OF A DI(LOWER ALKYL) ZINC HAVE THE FORMULA:
Claim 4
Independent Claim
55 words
A METHOD FOR POLYMERIZING VICINAL ALKYLENE OXIDES, WHICH COMPRISES CONTACTING UNDER POLYMERIZING CONDITIONS A MONOMERIC VICINAL ALKYLENE OXIDE FREE OF INTERFERING FUNCTIONAL GROUPS WITH ABOUT 0.01 TO 1 PERCENT BY WEIGHT, RELATIVE TO SAID ALKYLENE OXIDE, OF A POLYMERIZATION CATALYST CONSISTING OF THE PRODUCT OF THE REACTION OF A DI(LOWER ALKYL) ZINC HAVE THE FORMULA:
References Cited (Backward Citations)
US3398119A
Cited
US3058923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |