US3645954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic thermosetting resin
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1969-02-06
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Granted: 1972-02-29
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Expires: 1989-02-06
Abstract
Abstract AN AQUEOUS CATIONIC THERMOSETTING RESIN SOLUTION IS PREPARED BY REACTING AN ALIPHATIC DICARBOXYLIC ACID WITH A POLYALKYLENEPOLYAMINE, REACTING THE THUS OBTAINED POLYAMIDE INTERMEDIATE WITH A LACTAM AND FURTHER REACTING AN AQUEOUS SOLUTION OF THE THUS OBTAINED BLOCK COPOLYAMIDE WITH EPICHLOROHYDRIN. THE THUS OBTAINED RESIN SOLUTION IS USEFUL AS AN AGENT FOR IMPROVING A WET STRENGTH OF PAPER, PIGMENT RETENTION AID AND DRAINAGE IMPROVER, WHEN APPLIED TO PAPER MAKING, AND FURTHER USEFUL AS A FLOCCULANT AND SHRINK-PROOF AGENT.
Inventors
- 👤 Yutaka Terada
- 👤 Masanobu Urata
- 👤 Kumeo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022; C08G69/00; C08G69/48; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |