US3781238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous chain extension of nco prepolymer with tertiary amino polyol using nonionic surfactant,and aqueous dispersion produced
Assignee: Reichhold Chemicals Inc
•
Filing: 1971-08-04
•
Granted: 1973-12-25
•
Expires: 1991-08-04
Abstract
Abstract THERE IS DISCLOSED A METHOD FOR PREPARING AN AQUEOUS DISPERSION FROM A FREE ISOCYANATE GROUP-CONTAINING POLYURETHANE PREPOLYMER MADE FROM DIISOCYANATE AND POLYOXYPROPYLENE POLYCOL OR POLYOXYBUTYLENE POLYOL. THE PREPOLYMER IS REACTED WITH A DEFINED TERTIARY AMINOPOLYCOL, E.G., METHYL DIETHANOLAMINE, IN THE PRESENCE OF A HYDROXYL-CONTAINING, NONIONIC SURFACE-ACTING AGENT AND WATER. THE RESULTING AQUEOUS DISPERSION OF POLYURETHANE IS PARTICULARLY USEFUL AS A COATING FOR VARIOUS SOLID SUBSTRATES.
Inventors
- 👤 J Helm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |