US3704229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin curing agent
Assignee: Toka Shikiso Chemical Industry Co Ltd
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Filing: 1969-12-17
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Granted: 1972-11-28
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Expires: 1989-12-17
Abstract
Abstract A NOVEL EPOXY RESIN CURING AGENT CURABLE EVEN IN A WET STATE AND HAVING AN IMPROVED COMPATIBILITY WITH TAR IS PREPARED BY ADDING ACRYLIC ACID ESTER AS COMPONENT A, TO A MIXTURE OF AT LEAST ONE OF SLIGHTLY-WATER-SOLUBLE OR UNSOLUBLE ALIPHATIC AMINES HAVING PRIMARY AMINES, AS COMPONENT B, AND XYLENE DIAMINE, AS COMPONENT C IN THE FIRST STAGE REACTION AND AMIDIZING ONE MOLE OF TERMINAL ESTER GROUPS OF SAID ADDITION PRODUCTS WITH COMPONENT C IN THE SECOND STAGE REACTION. THE PRESENT CURING AGENT IS LESS TOXIC AND A CLEAR LIQUID LOW VISCOSITY AND A DESIRED EPOXY CURED PRODUCT CAN BE OBTAINED BY MIXING IT WITH AN EPOXY RESIN BY FREELY CHANGING THE MIXING RATIO.
Inventors
- 👤 Hiroji Tashiro
- 👤 Tutomu Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/56; C08G59/58; C08G59/44; C08G59/5033; C08L; C08L63/00
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |