US4239865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl (dialkylthiocarbamoylthio)acetate resin, method for producing same and heavy metals-removing agent comprising same
Assignee: JNC Corp
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Filing: 1977-11-09
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Granted: 1980-12-16
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Expires: 1997-11-09
Abstract
Abstract A new polyvinyl(dialkylthiocarbamoylthio)acetate resin expressed by the formula ##STR1## (wherein R 1 and R 2 each represent hydrogen atom or an alkyl group of C 1 -C 5 ) is provided. Said resin has a superior heavy metals-removing performance and is insoluble in organic solvents and hence very useful as an agent for removing heavy metals. Said resin is prepared by reacting a tetraalkylthiuramdisulfide expressed by a formula ##STR2## (wherein R 3 , R 4 , R 5 and R 6 each represent hydrogen atom or an alkyl group of C 1 -C 5 ) with a vinyl acetate polymer on heating in a solvent. Said resin is used as an agent for removing heavy metals, alone or in admixture with an auxiliary agent such as active carbon.
Inventors
- 👤 Ryohkichi Tarao
- 👤 Kanji Kaku
- 👤 Masaki Hayashi
- 👤 Takao Nakamura
- 👤 Shigeo Ohishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:58
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/285; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; C02F1/283; C08; C08F; C08F8/00; C08F8/34; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
An agent for removing heavy metals selected from the group consisting of Hg, Cu and Cr, which agent comprises a polyvinyl(dialkylthiocarbamoylthio)acetate resin which is a polymer having a unit expressed by the formula ##STR7## wherein R 1 and R 2 each represent hydrogen atom or an alkyl group of C 1 -C 5 and is a reaction product of a vinyl acetate polymer with a tetraalkylthiuramdisulfide, said agent being insoluble in benzene and having the ability to remove metals selected from the group consisting of Hg, Cu and Cr from solutions containing the same.
Claim 2
Dependent Claim
94 words
An agent for removing heavy metals selected from the group consisting of Hg, Cu and Cr, which agent comprises a polyvinyl(dialkylthiocarbamoylthio)acetate resin which is a polymer having a unit expressed by the formula ##STR7## wherein R 1 and R 2 each represent hydrogen atom or an alkyl group of C 1 -C 5 and is a reaction product of a vinyl acetate polymer with a tetraalkylthiuramdisulfide, said agent being insoluble in benzene and having the ability to remove metals selected from the group consisting of Hg, Cu and Cr from solutions containing the same.
Claim 3
Dependent Claim
11 words
An agent according to claim 1 wherein said tetraalkylthiuramdisulfide is tetraethylthiramdsulfide.
Claim 4
Dependent Claim
24 words
An agent for removing heavy metals according to claim 1 which contains as an auxiliary agent active carbon, bone charcoal or finely divided coal.
Claim 5
Dependent Claim
18 words
An agent for removing heavy metals according to claim 3 wherein said auxiliary agent is powdered active carbon.
Claim 6
Dependent Claim
20 words
An agent according to claim 1 wherein the mixing ratio of said auxiliary agent is in the range of 10:1-1:10.
Claim 7
Dependent Claim
20 words
An agent according to claim 2 wherein the mixing ratio of said auxiliary agent is in the range of 10:1-1:10.
Claim 8
Dependent Claim
22 words
An agent according to claim 3 wherein the mixing raio of said auxiliary agent is in the range of 10:1 to 1:10.
Claim 9
Dependent Claim
26 words
An agent according to claim 1 wherein said resin is prepared from a vinyl acetate polymer in the form of an emulsion or a methanol solution.
Claim 10
Dependent Claim
16 words
An agent according to claim 1 wherein said polymer is polyvinyl(dimethylthiocarbamoylthio)acetate and said tetraalkylthiuramdisulfide is tetramethylthiouramdisulfide.
Claim 11
Dependent Claim
11 words
An agent according to claim 1 wherein said polymer is polyvinyl(diethylthiocarbamoylthio)acetate.
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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |