Patent US1171021A successfully refreshed from Google Patents.
US2696504A
Expired / Lapsed
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Polyaminopolyureas
Assignee: Rohm and Haas Co
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Filing: 1952-07-12
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Granted: 1954-12-07
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Expires: 1972-07-12
Abstract
No abstract record available.
Inventors
- 👤 Robert S Yost
- 👤 Robert W Auten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854; C07C273/1863
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
A PROCESS OF PREPARING POLYUREAS WHICH COMPRISES REACTING BY HEATING TOGETHER AT 70* TO 150* C. A DIHALOALKANE OF NOT OVER THREE CARBON ATOMS HAVING A CHAIN OF AT LEAST TWO CARBON ATOMS BETWEEN THE HALOGEN ATOMS, SAID HALOGEN BEING A MEMBER OF THE CLASS CONSISTING OF CHLORINE AND BROMINE, AND A POLYETHYLENEPOLYAMINE OF A MOLECULAR WEIGHT OF AT LEAST 146, THE MOLE RATIO OF DIHALOALKANE TO POLYETHYLENEPOLYAMINE BEING AT LEAST 0.7:1 AND NOT EXCEEDING ABOUT 1.6:1 AND YIELD SOLUBLE CONDENSATION PRODUCTS, CONTINUING REACTING SAME UNTIL A 60% TO 65% AQUEOUS SOLUTION OF THE CONDENSATION PRODUCTS HAS A GARDNER-HOLDT VISCOSITY OF G TO Z3 AT 25* C., AND REACTING SAID PRODUCTS BY HEATING WITH UREA BETWEEN 100* AND 200* C. UNTIL A 50% AQUEOUS SOLUTION OF THE RESULTING REACTION PRODUCTS HAS A GARDNER-HOLDT VISCOSITY OF ABOUT B TO M AT 25* C., THE RATIO OF UREA TO -NH- GROUPS OF SAID NITROGENOUS CONDENSATION PRODUCTS BEING BETWEEN 0.2:1 AND 1.5:1.
Claim 2
Dependent Claim
159 words
A PROCESS OF PREPARING POLYUREAS WHICH COMPRISES REACTING BY HEATING TOGETHER AT 70* TO 150* C. A DIHALOALKANE OF NOT OVER THREE CARBON ATOMS HAVING A CHAIN OF AT LEAST TWO CARBON ATOMS BETWEEN THE HALOGEN ATOMS, SAID HALOGEN BEING A MEMBER OF THE CLASS CONSISTING OF CHLORINE AND BROMINE, AND A POLYETHYLENEPOLYAMINE OF A MOLECULAR WEIGHT OF AT LEAST 146, THE MOLE RATIO OF DIHALOALKANE TO POLYETHYLENEPOLYAMINE BEING AT LEAST 0.7:1 AND NOT EXCEEDING ABOUT 1.6:1 AND YIELD SOLUBLE CONDENSATION PRODUCTS, CONTINUING REACTING SAME UNTIL A 60% TO 65% AQUEOUS SOLUTION OF THE CONDENSATION PRODUCTS HAS A GARDNER-HOLDT VISCOSITY OF G TO Z3 AT 25* C., AND REACTING SAID PRODUCTS BY HEATING WITH UREA BETWEEN 100* AND 200* C. UNTIL A 50% AQUEOUS SOLUTION OF THE RESULTING REACTION PRODUCTS HAS A GARDNER-HOLDT VISCOSITY OF ABOUT B TO M AT 25* C., THE RATIO OF UREA TO -NH- GROUPS OF SAID NITROGENOUS CONDENSATION PRODUCTS BEING BETWEEN 0.2:1 AND 1.5:1.
Claim 3
Dependent Claim
9 words
THE PRODUCT OBTAINED BY THE PROCESS OF CLAIM 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |