US3239491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin for wet strength paper
Assignee: Hexion Inc
•
Filing: 1962-01-26
•
Granted: 1966-03-08
•
Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Kwan C Tsou
- 👤 Elizabeth A Blommers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; C08G65/00; C08G65/02; C08G65/26; C08G65/2618; C08G65/2633
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE PROCESS OF MAKING A RESIN WHICH COMPRISES THE STEPS OF: (1) REACTING (A) A WATER DISPERSION OF 1 MOL OF A C2-C10 ALPHA-UNSATURATED POLYCARBOXYLIC ACID, (B) 1-5 MOLS OF AMMONIA AND (C) ABOUT 4.4-1.6 MOLS OF A WATER-SOLUBLE ALKYLENE POLYAMINE HAVING 3-16 CARBON ATOMS AND AT LEAST 1 SECONDARY AND 2 PRIMARY AMINE GROUPS TO THE MOLECULE; (2) CONTINUING THE REACTION UNTIL SALT FORMATION IS SUBSTANTIALLY COMPLETE; (3) EVAPORATING SAID WATER FROM THE REACTION; (4) HEATING SAID REACTION TO TEMPERATURES AT WHICH SAID SALT UNDERGOES PYROLYTIC DECOMPOSITION TO AMIDE; (5) COOLING AND DISSOLVING SAID AMIDE IN WATER; (6) MIXING INTO THE SOLUTION OF DISSOLVED AMIDE, A WATER DISPERSABLE EPIHALOHYDRIN CONTAINING APPROXIMATELY 3 CARBON ATOMS IN PROPORTION OF BETWEEN ABOUT 4-3.5 MOLS, AND; (7) WARMING THE MIXTURE SO MADE UNTIL THE PH OF SAID MIXTURE FALLS BELOW 7.
Claim 2
Dependent Claim
138 words
THE PROCESS OF MAKING A RESIN WHICH COMPRISES THE STEPS OF: (1) REACTING (A) A WATER DISPERSION OF 1 MOL OF A C2-C10 ALPHA-UNSATURATED POLYCARBOXYLIC ACID, (B) 1-5 MOLS OF AMMONIA AND (C) ABOUT 4.4-1.6 MOLS OF A WATER-SOLUBLE ALKYLENE POLYAMINE HAVING 3-16 CARBON ATOMS AND AT LEAST 1 SECONDARY AND 2 PRIMARY AMINE GROUPS TO THE MOLECULE; (2) CONTINUING THE REACTION UNTIL SALT FORMATION IS SUBSTANTIALLY COMPLETE; (3) EVAPORATING SAID WATER FROM THE REACTION; (4) HEATING SAID REACTION TO TEMPERATURES AT WHICH SAID SALT UNDERGOES PYROLYTIC DECOMPOSITION TO AMIDE; (5) COOLING AND DISSOLVING SAID AMIDE IN WATER; (6) MIXING INTO THE SOLUTION OF DISSOLVED AMIDE, A WATER DISPERSABLE EPIHALOHYDRIN CONTAINING APPROXIMATELY 3 CARBON ATOMS IN PROPORTION OF BETWEEN ABOUT 4-3.5 MOLS, AND; (7) WARMING THE MIXTURE SO MADE UNTIL THE PH OF SAID MIXTURE FALLS BELOW 7.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |