Patent US3222338A successfully refreshed from Google Patents.
US3222338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing polyvinyl formate of high crystallinity
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-08-23
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Granted: 1965-12-07
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Expires: 1981-08-23
Abstract
No abstract record available.
Inventors
- 👤 Fujii Kiyoshi
- 👤 Imoto Saburo
- 👤 Ukida Junji
- 👤 Matsumoto Masakazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:11
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF PREPARING HIGHLY CRYSTALLINE POLYVINYL FORMATE WHICH COMPRISES, PREPARING A POLYMERIZATION SYSTEM CONTAINING VINYL FORMATE MONOMER AND A FREE RADICAL POLYMERIZATION CATALYST AND A NORMALLY-LIQUID ALIPHATIC ALDEHYDE SOLVENT, SAID ALDEHYDE SOLVENT BEING PRESENT IN SAID POLYMERIZATION SYSTEM IN AN AMOUNT OF AT LEAST 50 MOL PERCENT BASED ON THE WEIGHT OF SAID VINYL FORMATE MONOMER, SAID NORMALLY-LIQUID ALIPHATIC ALDEHYDE SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF ACETALDEHYDE, BUTYRALDEHYDE, AND A MIXTURE OF ACETALDEHYDE AND BUTYRALDEHYDE; POLYMERIZING SAID VINYL FORMATE MONOMER IN SAID POLYMERIZATION SYSTEM; AND RECOVERING HIGHLY CRYSTALLINE POLYVINYL FORMATE FROM SAID SYSTEM.
Claim 2
Independent Claim
96 words
A METHOD OF PREPARING HIGHLY CRYSTALLINE POLYVINYL FORMATE WHICH COMPRISES, PREPARING A POLYMERIZATION SYSTEM CONTAINING VINYL FORMATE MONOMER AND A FREE RADICAL POLYMERIZATION CATALYST AND A NORMALLY-LIQUID ALIPHATIC ALDEHYDE SOLVENT, SAID ALDEHYDE SOLVENT BEING PRESENT IN SAID POLYMERIZATION SYSTEM IN AN AMOUNT OF AT LEAST 50 MOL PERCENT BASED ON THE WEIGHT OF SAID VINYL FORMATE MONOMER, SAID NORMALLY-LIQUID ALIPHATIC ALDEHYDE SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF ACETALDEHYDE, BUTYRALDEHYDE, AND A MIXTURE OF ACETALDEHYDE AND BUTYRALDEHYDE; POLYMERIZING SAID VINYL FORMATE MONOMER IN SAID POLYMERIZATION SYSTEM; AND RECOVERING HIGHLY CRYSTALLINE POLYVINYL FORMATE FROM SAID SYSTEM.
References Cited (Backward Citations)
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Cited
US2122805A
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US2326048A
Cited
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Cited
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Cited
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Cited
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GB819254A
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |