US3885069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of crosslinked polyethylenimine and impregnation of cellulosic material with in situ crosslink-polymerized ethylenimine
Assignee: United States Department of Agriculture
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Filing: 1972-08-11
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Granted: 1975-05-20
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Expires: 1992-08-11
Abstract
Abstract Cotton and other fibrous material is impregnated with ethylenimine prepolymer prepared by reacting ethylenimine and certain di- and polyfunctional alkyl or aryl halide to produce an insoluble in situ formed network polymer which is physically bound in the structure of the substrate used. This new material is an excellent scavenger of heavy metals in water. This material can be prepared to be simultaneously low in ion-exchange capacity while being high in capacity for complexing with heavy metals.
Inventors
- 👤 Earl J Roberts
- 👤 Stanley P Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/487; B; B01; B01J; B01J20/00; B01J20/22; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; D06M15/00; D06M15/19; D06M15/37; D06M15/61
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A METHOD FOR PRODUCING IN SITU FORMED CROSSLINKED POLYETHYLAMINE IN A FIBROUS MATERIAL, THE METHOD COMPRISING A. MIXING ETHYLENIMINE WITH AN ALKYL HALIDE SELECTED FROM THE GROUP CONSISTING OF 1,2-DICHLOROETHANE, TRIS(2CHLOROETHYL)PHOSPHORAMIDE, BIS(2-CHLOROETHYLINYL)PHOSPHONATE, TRIS(2,3-DIBROMOPROPYL)PHOSPHATE TRIS(1,3-DICHLOROSPHORAMIDE)PHOSPHATE, B,B''-DICHLOROETHYL ETHER AND DICHLOROMETHANE IN A MOLAR RATIO OF ABOUT FROM 44:1 TO 27:1; B. ALLOWING THE MIXTURE TO STAND AT 10* TO 50*C FOR FROM 2 TO 16 HOURS, THEREBY FORMING A PREPOLYMER C. DILUTING THE MIXTURE IN WATER OR ETHANOL TO OBTAIN A 5 TO 50 PERCENT ONCENTRATION OF THE PREPOLYMER; D. IMPREGNATING THE FIBROUS MATERIAL WITH THE PREPOLYMER OF STEP (C9 TO OBTAIN A WET PICKUP OF ABOUT FROM 50 TO 150 PERCENT )T; AND E. ALLOWING THE IMPREGNATED MATERIAL TO DRY AT ABOUT 25*C UNTIL THE PREPOLYMER IS CROSSLINKED AND POLYMERIZED.
Claim 2
Independent Claim
129 words
A METHOD FOR PRODUCING IN SITU FORMED CROSSLINKED POLYETHYLAMINE IN A FIBROUS MATERIAL, THE METHOD COMPRISING A. MIXING ETHYLENIMINE WITH AN ALKYL HALIDE SELECTED FROM THE GROUP CONSISTING OF 1,2-DICHLOROETHANE, TRIS(2CHLOROETHYL)PHOSPHORAMIDE, BIS(2-CHLOROETHYLINYL)PHOSPHONATE, TRIS(2,3-DIBROMOPROPYL)PHOSPHATE TRIS(1,3-DICHLOROSPHORAMIDE)PHOSPHATE, B,B''-DICHLOROETHYL ETHER AND DICHLOROMETHANE IN A MOLAR RATIO OF ABOUT FROM 44:1 TO 27:1; B. ALLOWING THE MIXTURE TO STAND AT 10* TO 50*C FOR FROM 2 TO 16 HOURS, THEREBY FORMING A PREPOLYMER C. DILUTING THE MIXTURE IN WATER OR ETHANOL TO OBTAIN A 5 TO 50 PERCENT ONCENTRATION OF THE PREPOLYMER; D. IMPREGNATING THE FIBROUS MATERIAL WITH THE PREPOLYMER OF STEP (C9 TO OBTAIN A WET PICKUP OF ABOUT FROM 50 TO 150 PERCENT )T; AND E. ALLOWING THE IMPREGNATED MATERIAL TO DRY AT ABOUT 25*C UNTIL THE PREPOLYMER IS CROSSLINKED AND POLYMERIZED.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the fibrous material is celluslosic.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the alkyl halide is selected from the group consisting of bis(2-chloroethylvinyl)phosphonate, tris (2,3-dibromopropyl)-phosphate and tris(1,3-dichloroisopropyl)phosphate.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the alkyl halide is selected from the group consisting of 1,2-dichloroethane, dichloromethane and B,B''-dichloroethyl ether.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the alkyl halide is tris(2-chloroethyl)phosphoramide.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |