US3899472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelating resin and process for preparing the same
Assignee: Toray Industries Inc
•
Filing: 1974-11-18
•
Granted: 1975-08-12
•
Expires: 1994-11-18
Abstract
Abstract A novel, easily regeneratable, high-performance chelating resin and process for preparing the same. More in particular, a crosslinked polymer consisting mainly of an aromatic vinyl monomer having a polyalkylene polyamine functional group containing an iminodipropionic acid group or an iminodi- Alpha methylpropionic acid group, and process for preparing the same. Because chelating resins of the present invention have pendant functional groups attached pendantly thereto, at least one iminodipropionic acid group or iminodi- Alpha -methylpropionic acid group and at least two nitrogen atoms, it has a very large capacity for adsorbing heavy metals per unit volume of chelating resin. Moreover, because the stability of the chelate of said iminodipropionic acid group or iminodi- Alpha -methylpropionic acid group with heavy metal ions is relatively low, regeneration from an adsorbent with heavy metals is easy. According to the process a high-performance chelating resin can be prepared, having a very high ability to absorb heavy metals. It is easily regeneratable, which has heretofore been inexpensively unattainable by conventional processes and is produced by a new process which is high in industrial practical value.
Inventors
- 👤 Toshihiko Aya
- 👤 Kazumasa Chiba
- 👤 Zenzi Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A CHELATING RESIN HAVING A CROSSLINKED POLMER STRUCTURE WHOSE MAIN STRUCTURE UNIT IS SELECTED FROM THE GROUP CONSISTING OF THE FOLLOWING (1) AND (11)
Claim 2
Dependent Claim
24 words
A CHELATING RESIN HAVING A CROSSLINKED POLMER STRUCTURE WHOSE MAIN STRUCTURE UNIT IS SELECTED FROM THE GROUP CONSISTING OF THE FOLLOWING (1) AND (11)
Claim 3
Dependent Claim
15 words
A chelating resin having a crosslinked polymer structure, the main structural unit of which is
Claim 4
Dependent Claim
15 words
A chelating resin having a crosslinked polymer structure, the main structural unit of which is
Claim 5
Dependent Claim
13 words
A chelating resin having a crosslinked polymer structure whose main structural unit is
Claim 6
Dependent Claim
13 words
A chelating resin having a crosslinked polymer structure whose main structural unit is
Claim 7
Dependent Claim
158 words
A process for preparing a chelating resin having a crosslinked polymer structure whose main structural unit is selected from the group consisting of (I) and (II), which process comprises reacting a halomethyl group bonded to aromatic nuclei of a crosslinked polymer consisting mainly of an aromatic vinyl monomer with a polyalkylene polyamine derivative (intermediate of a functional group) having in the molecule at least one group selected from the class consisting of iminodipropionitrile, iminodi- Alpha -methylpropionitrile, alkyl iminodipropionate and alkyl iminodi- Alpha -methylpropionate wherein the alkyl groups have 1 - 8 carbon atoms, and at the same time, having at least one primary and/or secondary amino group in the presence of a swelling solvent, thereafter hydrolyzing the reaction product in the presence of an acid or alkali to produce at least one group selected from the class consisting of iminodipropionic acid, iminodi- Alpha -methylpropionic acid, iminodipropionate and iminodi- Alpha -methylpropionate, wherein said structural units (I) and (II) are:
Claim 8
Dependent Claim
158 words
A process for preparing a chelating resin having a crosslinked polymer structure whose main structural unit is selected from the group consisting of (I) and (II), which process comprises reacting a halomethyl group bonded to aromatic nuclei of a crosslinked polymer consisting mainly of an aromatic vinyl monomer with a polyalkylene polyamine derivative (intermediate of a functional group) having in the molecule at least one group selected from the class consisting of iminodipropionitrile, iminodi- Alpha -methylpropionitrile, alkyl iminodipropionate and alkyl iminodi- Alpha -methylpropionate wherein the alkyl groups have 1 - 8 carbon atoms, and at the same time, having at least one primary and/or secondary amino group in the presence of a swelling solvent, thereafter hydrolyzing the reaction product in the presence of an acid or alkali to produce at least one group selected from the class consisting of iminodipropionic acid, iminodi- Alpha -methylpropionic acid, iminodipropionate and iminodi- Alpha -methylpropionate, wherein said structural units (I) and (II) are:
Claim 9
Dependent Claim
158 words
A process for preparing a chelating resin having a crosslinked polymer structure whose main structural unit is hereinafter defined as a structure selected from the group consisting of (I) and (II), which process comprises reacting simultaneously a halomethyl group bonded to aromatic nuclei of a crosslinked polymer consisting mainly of an aromatic vinyl monomer with (A) a polyalkylene polyamine derivative having in the molecule at least one primary amino group and one secondary amino group and (B) at least one unsaturated compound selected from the group consisting of acrylonitrile, methacrylonitrile, alkyl acrylate and alkyl methacrylate wherein the alkyl groups have 1 - 8 carbon atoms in the presence of a swelling solvent, thereafter hydrolyzing the reaction product in the presence of an acid or alkali to produce at least one group selected from the class consisting of iminodipropionic acid, iminodi- Alpha -methylpropionic acid, iminodipropionate and iminodi- Alpha -methylpropionate, said structural units (I) and (II) being defined as follows:
Claim 10
Dependent Claim
158 words
A process for preparing a chelating resin having a crosslinked polymer structure whose main structural unit is hereinafter defined as a structure selected from the group consisting of (I) and (II), which process comprises reacting simultaneously a halomethyl group bonded to aromatic nuclei of a crosslinked polymer consisting mainly of an aromatic vinyl monomer with (A) a polyalkylene polyamine derivative having in the molecule at least one primary amino group and one secondary amino group and (B) at least one unsaturated compound selected from the group consisting of acrylonitrile, methacrylonitrile, alkyl acrylate and alkyl methacrylate wherein the alkyl groups have 1 - 8 carbon atoms in the presence of a swelling solvent, thereafter hydrolyzing the reaction product in the presence of an acid or alkali to produce at least one group selected from the class consisting of iminodipropionic acid, iminodi- Alpha -methylpropionic acid, iminodipropionate and iminodi- Alpha -methylpropionate, said structural units (I) and (II) being defined as follows:
Claim 11
Dependent Claim
14 words
A process according to claim 4, wherein said intermediate of the functional group is
Claim 12
Dependent Claim
46 words
A process according to claim 4, wherein said crosslinked polymer consisting mainly of an aromatic vinyl monomer is substantially a copolymer of styrene and divinyl benzene in technical grade (consisting of approximaTely 40 - 80% of divinyl benzene and approximately 60 - 20% of ethylvinyl benzene).
References Cited (Backward Citations)
US3645997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |