US4529782A
Expired / Lapsed
US
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High molecular weight water soluble polymers
Assignee: Union Carbide Corp
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Filing: 1983-11-17
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Granted: 1985-07-16
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Expires: 2003-11-17
Abstract
Abstract Described herein are water soluble acrylamide containing polymers having an intrinsic viscosity of at least about 15 dl/g. These polymers are suitable for use in water purification.
Inventors
- 👤 You-Ling Fan
- 👤 Nan S. Chu
- 👤 George L. Brode
- 👤 Meyer R. Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08F220/52; C08F220/54; C08F220/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A water soluble acrylamide containing polymer having an intrinsic viscosity of from about 15 to about 28 dl/g as measured in a one normal aqueous sodium chloride solution at 25° C. and having the following formula: ##STR8## wherein: R, R 1 and R 3 are independently hydrogen or methyl; R 2 + is an alkali metal ion; R 4 is (1) OR 5 wherein R 5 is an alkyl group having up to 5 carbon atoms, (2) ##STR9## wherein R 6 is an alkyl group having up to 8 carbon atoms, (3) ##STR10## wherein R 7 is methyl, ethyl or butyl, (4) phenyl, (5) substituted phenyl or (6) ##STR11## a is from 5 to 90 percent; b is from 5 to about 90 percent; c is from about 0.2 to about 20 percent; and d is an integer of from about 100,000 to about 500,000.
Claim 2
Dependent Claim
145 words
A water soluble acrylamide containing polymer having an intrinsic viscosity of from about 15 to about 28 dl/g as measured in a one normal aqueous sodium chloride solution at 25° C. and having the following formula: ##STR8## wherein: R, R 1 and R 3 are independently hydrogen or methyl; R 2 + is an alkali metal ion; R 4 is (1) OR 5 wherein R 5 is an alkyl group having up to 5 carbon atoms, (2) ##STR9## wherein R 6 is an alkyl group having up to 8 carbon atoms, (3) ##STR10## wherein R 7 is methyl, ethyl or butyl, (4) phenyl, (5) substituted phenyl or (6) ##STR11## a is from 5 to 90 percent; b is from 5 to about 90 percent; c is from about 0.2 to about 20 percent; and d is an integer of from about 100,000 to about 500,000.
Claim 3
Dependent Claim
51 words
A water soluble polymer as defined in claim 1, wherein the polymer has the following formula: ##STR12## wherein R, R 1 , R 2 + , R 3 , R 4 , a, b, c, and d are as previously defined and e is from about 0.1 to about 20 percent.
Claim 4
Dependent Claim
75 words
A water soluble polymer as defined in claim 1, wherein the polymer has the following formula: ##STR13## wherein R 2 + is Na + or K + , R 7 is methyl, ethyl, butyl, and f is from about 5 to about 90, preferably from about 30 to about 60 percent, g is from about 5 to 90, preferably from about 30 to 60 percent and h is from about 0.2 to about 20 percent.
Claim 5
Dependent Claim
12 words
A water-soluble polymer as defined in claim 1 wherein R is hydrogen.
Claim 6
Dependent Claim
21 words
A water-soluble polymer as defined in claim 1 wherein R 1 is hydrogen and R 2 + is Na + .
Claim 7
Dependent Claim
29 words
A water-soluble polymer as defined in claim 1 wherein the monomeric unit defined in (c), is derived from a vinyl ester, alkyl acrylate, alkyl methacrylate, vinyl ether or styrene.
Claim 8
Dependent Claim
22 words
A water-soluble polymer as defined in claim 6 wherein the monomeric unit is derived from an alkyl acrylate or a vinyl acetate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |