Patent US2699435A successfully refreshed from Google Patents.
US2699435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurea resins
Assignee: Rohm and Haas Co
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Filing: 1952-07-22
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Granted: 1955-01-11
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Expires: 1972-07-22
Abstract
No abstract record available.
Inventors
- 👤 Robert W Auten
- 👤 Robert S Yost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:19
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR PREPARING POLYHYDROXYPOLYALKYLENEPOLYUREA-FORMALDEHYDE CONDENSATES WHICH COMPRISES REACTING BETWEEN ABOUT 0* AND 100*C. IN THE PRESENCE OF WATER EPICHLOROHYDRIN AND AN ALKYLENE POLYAMINE HAVING TWO TO THE CARBON ATOMS IN THE ALKYLENE PORTION THEREOF IN A MOLE RATIO FROM 1:1 TO 1.4:1 UNTIL AN AQUEOUS SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYAMINE AT A CONCENTRATION OF ABOUT 46% HAS A VISCOSITY FROM J TO Z7 AT 25*C., ON THE GARDNER-HOLDT SCALE, REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE WITH UREA BETWEEN 100* AND 200*C. IN A RATIO FROM 0.5:1 TO 1.8:1 OF UREA PER -NH- GROUP OF SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE UNTIL AN AQUEOUS 45% SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYUREA HAS A VISCOSITY FROM B TO Z3 AT 25*C. ON THE GARDNER-HOLDT SCALE, AND REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYUREA WITH FORMALDEHYDE IN A SOLUTION AT A PH BETWEEN 7 AND 9.5.
Claim 2
Dependent Claim
132 words
A PROCESS FOR PREPARING POLYHYDROXYPOLYALKYLENEPOLYUREA-FORMALDEHYDE CONDENSATES WHICH COMPRISES REACTING BETWEEN ABOUT 0* AND 100*C. IN THE PRESENCE OF WATER EPICHLOROHYDRIN AND AN ALKYLENE POLYAMINE HAVING TWO TO THE CARBON ATOMS IN THE ALKYLENE PORTION THEREOF IN A MOLE RATIO FROM 1:1 TO 1.4:1 UNTIL AN AQUEOUS SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYAMINE AT A CONCENTRATION OF ABOUT 46% HAS A VISCOSITY FROM J TO Z7 AT 25*C., ON THE GARDNER-HOLDT SCALE, REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE WITH UREA BETWEEN 100* AND 200*C. IN A RATIO FROM 0.5:1 TO 1.8:1 OF UREA PER -NH- GROUP OF SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE UNTIL AN AQUEOUS 45% SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYUREA HAS A VISCOSITY FROM B TO Z3 AT 25*C. ON THE GARDNER-HOLDT SCALE, AND REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYUREA WITH FORMALDEHYDE IN A SOLUTION AT A PH BETWEEN 7 AND 9.5.
References Cited (Backward Citations)
US2400016A
Cited
US2554475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |