US3055866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolysis of acetal copolymers
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1959-08-21
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Granted: 1962-09-25
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Expires: 1979-08-21
Abstract
No abstract record available.
Inventors
- 👤 Oyanagi Yasuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08F; C08F8/00; C08F8/12; C08G2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE METHOD OF PREPARING A VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS WHICH COMPRISES HYDROLYZING A VINYL ACETATE-ACROLEIN ACETAL COPOLYMER CONTAINING ABOUT 1 TO ABOUT 20 MOL PERCENT ACROLEIN ACETAL FOR ABOUT 1/2 TO AGOUT 5 HOURS AT A TEMPERATURE UP TO ABOUT 40*C. IN AN AQUEOUS C1-C2 ALKANOL SOLUTION CONTAINING FROM ABOUT 20 PERCENT TO ABOUT 40% WATER IN THE PRESENCE OF DILUTE ACID CATLYST SELECTED FROM THE ACID GROUP CONSISTING OF HYDROCHLORIC ACID, SULFURIC AID AND NITRIC ACID TO PRODUCE A VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS, AND RECOVERING SAID PRODUCT VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS.
Claim 2
Independent Claim
98 words
THE METHOD OF PREPARING A VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS WHICH COMPRISES HYDROLYZING A VINYL ACETATE-ACROLEIN ACETAL COPOLYMER CONTAINING ABOUT 1 TO ABOUT 20 MOL PERCENT ACROLEIN ACETAL FOR ABOUT 1/2 TO AGOUT 5 HOURS AT A TEMPERATURE UP TO ABOUT 40*C. IN AN AQUEOUS C1-C2 ALKANOL SOLUTION CONTAINING FROM ABOUT 20 PERCENT TO ABOUT 40% WATER IN THE PRESENCE OF DILUTE ACID CATLYST SELECTED FROM THE ACID GROUP CONSISTING OF HYDROCHLORIC ACID, SULFURIC AID AND NITRIC ACID TO PRODUCE A VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS, AND RECOVERING SAID PRODUCT VINYL ACETATE COPOLYMER CONTAINING ALDEHYDE GROUPS.
References Cited (Backward Citations)
US2467430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |