US3574786A
Expired / Lapsed
US
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Polyacetal compositions stabilized with a polymer from a dicarboxylic acid dihydrazide,diamine and urea
Assignee: Asahi Kasei Corp
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Filing: 1968-12-20
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Granted: 1971-04-13
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Expires: 1988-12-20
Abstract
Abstract POLYOXYMETHYLENE COMPOSITIONS MAY BE STABILIZED BY IN ADDITION OF 0.1 TO 10% OF A POLYMERIC CONDENSATE PREPARED BY REACTING OF DICARBOXYLIC ACID DIBYDRAZIDE, A DIAMINE, AND A UREA, THIOUREA OR DERIVATIVES THEREOF. THE PROPORTIONS OF THE RECTANTS ARE 1:0.15:0.1-10 RESPECTIVELY. THE CONDENSATE IS PREPARED BY HEATING THE REACTANTS AT 50*C.-300*C. FROM 1 TO 20 HOURS IN AIR OR INERT GAS. A POLYACETAL COMPOSITION CONTAINING AS A THERMAL STABILIZER A NITROGEN-CONTAINING TERNARY CONDENSATION POLYMER COMPRISING (A) DICARBOXYLIC ACID DIBHDRZAZIDE, (B) DIAMINE OR POLAMINE AND (C) UREA, UREA DERIVATIVES, THIORUREA OR THIOUREA DERIVATIVES.
Inventors
- 👤 Shinichi Ishida
- 👤 Noboru Ohshima
- 👤 Hiromichi Fukuda Takeshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:33
CPC Classifications
C; C08; C08G; C08G73/00; C08L; C08L59/00; C08L59/02; C08L79/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |