US4028284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic chelate resin
Assignee: Unitika Ltd
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Filing: 1975-09-11
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Granted: 1977-06-07
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Expires: 1995-09-11
Abstract
Abstract A high adsorption capacity phenolic chelate resin consisting of a heavy metal-adsorbing phenolic chelate resin, containing iminodiacetic acid groups in the phenol nuclei, and having an adsorbability to a heavy metal in the proportion of at least 1.2 m equivalent per g of dried terminal Na type resin, said phenolic chelate resin being prepared from phenols, aldehydes and iminodiacetic acid.
Inventors
- 👤 Masahide Hirai
- 👤 Mikio Fujimura
- 👤 Masahiro Kazigase
- 👤 Minoru Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:27
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/16; B; B01; B01J; B01J45/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A high adsorption capacity phenolic chelate resin consisting of a heavy metal-adsorbing phenolic chelate resin having an adsorbability to a heavy metal in the proportion of at least 1.2 milliequivalents per g. of dried terminal Na type resin, said phenolic chelate resin being prepared from at least one phenol, at least one aldehyde and iminodiacetic acid, said iminodiacetic acid being used in the ratio of more than 0.2 based on the total phenol.
Claim 2
Dependent Claim
73 words
A high adsorption capacity phenolic chelate resin consisting of a heavy metal-adsorbing phenolic chelate resin having an adsorbability to a heavy metal in the proportion of at least 1.2 milliequivalents per g. of dried terminal Na type resin, said phenolic chelate resin being prepared from at least one phenol, at least one aldehyde and iminodiacetic acid, said iminodiacetic acid being used in the ratio of more than 0.2 based on the total phenol.
Claim 3
Dependent Claim
28 words
The resin as claimed in claim 1, wherein said adsorbability to a heavy metal is at least 1.4 m equivalent per g. of dried terminal Na type resin..
Claim 4
Dependent Claim
21 words
The resin as claimed in claim 1, wherein said resin is a bead having a diameter of at least 2 mm.
Claim 5
Dependent Claim
90 words
A process for producing the bead-like resin as claimed in claim 3 which comprises the steps, in combination, (a) heating an acid mixture of phenols, aldehydes and iminodiacetic acid at a temperature of 20° to 90° C to introduce the iminodiacetic acid into the phenols, and (b) adding phenols and/or aldehydes thereto, conducting the polycondensation thereof in the presence of an acid catalyst, dispersing the reaction solution into a medium while said reaction solution is maintained in a fluidity, and then completing the polycondensation reaction thereof in a supension form.
Claim 6
Dependent Claim
26 words
The resin as claimed in claim 1, wherein said phenol is phenol, an alkyl-substituted phenol, a polyhydric phenol or a compound containing a phenolic hydroxyl group.
Claim 7
Dependent Claim
30 words
The resin as claimed in Claim 5, wherein said phenol is phenol, o-ethylphenol, m-ethylphenol, p-ethylphenol, p-phenylphenol, bisphenol A, o-cresol, m-cresol, p-cresol, 2,3-xylenol, 2,5-xylenol, 3,4-xylenol, 3,5-xylenol, resorcinol, catechal, or α -naphtol.
Claim 8
Dependent Claim
19 words
The resin as claimed in claim 1, wherein said aldehyde is formaldehyde, para-formaldehyde, hexamethylenetetramine, acetaldehyde, propionaldehyde, benzaldehyde or furfural.
References Cited (Backward Citations)
US3936399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |