US3715336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinyl amine and vinyl alcohol as flocculants
Assignee: Dow Chemical Co
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Filing: 1971-01-07
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Granted: 1973-02-06
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Expires: 1991-01-07
Abstract
Abstract Vinyl amine/vinyl alcohol copolymers prepared by hydrolysis of vinyl carbamate/vinyl acetate copolymers serve as effective flocculants in the clarification of aqueous suspensions of finely divided inorganic solids.
Inventors
- 👤 R Nowak
- 👤 J Woo
- 👤 D Heinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:50
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F8/00; C08F8/44; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
47 words
A copolymer of from about 20 to about 85 mole percent of vinyl alcohol, from about 15 to about 80 mole percent of vinyl amine and from about 10 to about 35 mole percent of alkyl N-vinyl carbamate wherein alkyl has from one to four carbon atoms.
Claim 2
Dependent Claim
47 words
A copolymer of from about 20 to about 85 mole percent of vinyl alcohol, from about 15 to about 80 mole percent of vinyl amine and from about 10 to about 35 mole percent of alkyl N-vinyl carbamate wherein alkyl has from one to four carbon atoms.
Claim 3
Dependent Claim
32 words
The copolymer according to claim 1 containing up to about 35 mole percent of ethylenically unsaturated monomer copolymerizable through the ethylenic bond with at least one of vinyl isocyanate and vinyl acetate.
Claim 4
Dependent Claim
58 words
An interpolymer of from about 40 to 60 mole percent of vinyl alcohol, from about 25 to about 40 mole percent of vinyl amine and from about 10 to about 35 mole percent of alkyl N-vinyl carbamate wherein alkyl has from one to four carbon atoms, said copolymer having a molecular weight from about 12,000 to about 40,000.
Claim 5
Dependent Claim
58 words
An interpolymer of from about 40 to 60 mole percent of vinyl alcohol, from about 25 to about 40 mole percent of vinyl amine and from about 10 to about 35 mole percent of alkyl N-vinyl carbamate wherein alkyl has from one to four carbon atoms, said copolymer having a molecular weight from about 12,000 to about 40,000.
Claim 6
Dependent Claim
31 words
The copolymer according to claim 3 which is an interpolymer of 45 mole percent of vinyl alcohol, 31 mole percent of vinyl amine, and 24 mole percent of methyl N-vinyl carbamate.
Claim 7
Independent Claim
81 words
A method for the preparation of copolymers of vinyl alcohol and vinyl amine comprising the steps of (1) copolymerizing vinyl acetate with vinyl isocyanate, (2) reacting the isocyanate functionality of the resulting copolymer with alkanol having one to four carbon atoms to form the corresponding carbamate functionality and (3) subjecting the copolymer to hydrolyzing conditions sufficient to convert at least a portion of the carbamate functionality to amine functionality and at least a portion of the acetate functionality to alcohol functionality.
Claim 8
Independent Claim
81 words
A method for the preparation of copolymers of vinyl alcohol and vinyl amine comprising the steps of (1) copolymerizing vinyl acetate with vinyl isocyanate, (2) reacting the isocyanate functionality of the resulting copolymer with alkanol having one to four carbon atoms to form the corresponding carbamate functionality and (3) subjecting the copolymer to hydrolyzing conditions sufficient to convert at least a portion of the carbamate functionality to amine functionality and at least a portion of the acetate functionality to alcohol functionality.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |