US3957904A
Expired / Lapsed
US
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Polymeric flocculant composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1974-05-09
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Granted: 1976-05-18
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Expires: 1994-05-09
Abstract
Abstract A polymeric flocculant composition having an excellent flocculation effect, which comprises (a) an acrylamide polymer containing 50 or more molar % of an acrylamide unit and (b) at least one amino resin precondensate selected from the group consisting of urea-formaldehyde, melamine-formaldehyde, guanidine-formaldehyde and dicyandiamide-formaldehyde, wherein the acrylamide polymer and the amino resin precondensate are admixed in a ratio of 90 : 10 to 99 : 1 by weight. The polymeric flocculant composition disclosed herein is useful for cleaning waste water.
Inventors
- 👤 Shin-ichi Isaoka
- 👤 Tutomu Shintani
- 👤 Mamoru Suzuki
- 👤 Wataru Tohma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08L; C08L33/00; C08L33/24; C08L33/26; C08L61/00; C08L61/20; Y; Y10; Y10S; Y10S525/00; Y10S525/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A polymeric flocculant composition comprising (a) an anionic copolymer of acrylamide with a sodium, potassium or ammonium salt of acrylic acid in a molar ratio of 85 : 15 to 80 : 20 and (b) a melamine-formaldehyde precondensate, the anionic acrylamide copolymer and the melamine-formaldehyde precondensate being admixed in a ratio of 95 : 5 to 99 : 1 by weight.
Claim 2
Dependent Claim
61 words
A polymeric flocculant composition comprising (a) an anionic copolymer of acrylamide with a sodium, potassium or ammonium salt of acrylic acid in a molar ratio of 85 : 15 to 80 : 20 and (b) a melamine-formaldehyde precondensate, the anionic acrylamide copolymer and the melamine-formaldehyde precondensate being admixed in a ratio of 95 : 5 to 99 : 1 by weight.
Claim 3
Dependent Claim
25 words
The polymeric flocculant composition according to claim 1, wherein said anionic acrylamide copolymer has an intrinsic viscosity in 1N NaNO 3 of 10 or more.
Claim 4
Dependent Claim
25 words
The polymeric flocculant composition according to claim 1, wherein the composition is an aqueous solution having a concentration of about 0.1 to 1.0% by weight.
Claim 5
Dependent Claim
15 words
The polymeric flocculant composition according to claim 1, wherein the composition is in powder form.
Claim 6
Dependent Claim
22 words
The polymeric flocculant composition according to claim 1, wherein said melamine-formaldehyde precondensate has a molecular weight of about 100 to about 1000.
Claim 7
Dependent Claim
27 words
The polymeric flocculant composition according to claim 1, wherein said anionic acrylamide copolymer has an intrinsic viscosity in 1N NaNO 3 of about 10 to about 30.
References Cited (Backward Citations)
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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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |