Filter and Metal Ion Removal Device
Assignee3M Innovative Properties Company
InventorsMitsuaki Kobayashi, Hideyuki Okada, Yukihisa Okada, Takaaki Shirai
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Abstract
To provide a filter capable of efficiently removing metal ions in a treatment liquid, and capable of easily obtaining a solution having an extremely low metal ion content. A depth filter includes a porous molded article. The porous molded article is a sintered material of mixed powder or a swollen material of the sintered material. The mixed powder contains dried gel powder and thermoplastic resin powder. The dried gel powder contains an ion exchange resin including a sulfonic acid group, and a nitrogen-containing chelating resin.
Claims12
A depth filter comprising
- a porous molded article being a sintered material of mixed powder or a swollen material of the sintered material, the mixed powder containing dried gel powder and thermoplastic resin powder, wherein
- the dried gel powder contains an ion exchange resin including a sulfonic acid group, and a nitrogen-containing chelating resin.
A depth filter comprising
- a porous molded article being a sintered material of mixed powder or a swollen material of the sintered material, the mixed powder containing dried gel powder including an ion exchange resin, and thermoplastic resin powder, wherein
- a number of particles of powder P1 contained on a surface per unit area is smaller than a number of particles of powder P2 contained on a cross-sectional surface per unit area, the surface being a surface of the porous molded article, the cross-sectional surface being a surface dividing the porous molded article into two in a thickness direction,
- where, among particles of the dried gel powder, P1 denotes a particle of powder having a projected area 10 or more times as large as an average projected area of a particle of the thermoplastic resin powder, the projected area of the particle of the powder P1 being an area on the surface, and P2 denotes a particle of powder having a projected area 10 or more times as large as an average projected area of a particle of the thermoplastic resin powder, the projected area of the particle of the powder P2 being an area on the cross-sectional surface.
A depth filter comprising
- a porous molded article being a sintered material of mixed powder or a swollen material of the sintered material, the mixed powder containing dried gel powder including an ion exchange resin, and thermoplastic resin powder, wherein
- an average particle diameter of the dried gel powder is two or more times as large as an average particle diameter of the thermoplastic resin powder, and
- when each of a surface of the porous molded article and a cross-sectional surface dividing the porous molded article into two in a thickness direction is observed with a scanning electron microscope in a range of a field of view of 950 μm×950 μm and subsequently an average projected area of five particles having large projected areas of the dried gel powder is calculated in each field of view,
- the average projected area on the surface is smaller than the average projected area on the cross-sectional surface.
Dependencies are inferred from the claim text.