Porous graft copolymer particles, method for producing same, and adsorbent material using same

Patent metadata

Field	Value
Publication number	US-9943825-B2
Application number	US-201514692986-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	Oct 30, 2012
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Provided are graft copolymer particles enabling introduction of adsorptive functional groups adsorbing metals and others, a method for producing same, and an adsorbent using same. (1) Porous graft copolymer particles containing graft chains introduced into porous particles (particle surface having an average pore diameter of 0.01-50 μm) including at least one resin selected from olefin resins, water-insoluble modified polyvinyl alcohol resins, amide resins, cellulosic resins, chitosan resins and (meth)acrylate resins. (2) A method for producing porous graft copolymer particles including (I) melt-kneading a polymer A and a polymer B other than the polymer A to obtain a compound material, (II) extracting and removing the polymer B from the compound material to obtain a porous material of the polymer A, (III) granulating the porous material, and (IV) introducing graft chains into the porous particles. (3) An adsorbent of porous graft copolymer particles.

First claim

What is claimed is:

1. A porous graft copolymer particle comprising:
a graft copolymer having a porous particulate shape,
wherein
the graft copolymer comprises at least one resin selected from the group consisting of an olefin resin, a water-insoluble modified polyvinyl alcohol resin, an amide resin, a cellulosic resin, a chitosan resin and a (meth)acrylate resin,
the at least one resin has at least one graft chain introduced thereinto,
the porous graft copolymer particle has an average pore diameter of from 0.01 μm to 50 μm on the surface thereof, and
a graft ratio is from 90 to 900 parts by mass based on 100 parts by mass of the at least one resin.

2. The porous graft copolymer particle as claimed in claim 1 , wherein the water-insoluble modified polyvinyl alcohol resin is an ethylene-vinyl alcohol copolymer.

3. The porous graft copolymer particle as claimed in claim 1 , wherein the graft chain includes a structural unit having a functional group.

4. The porous graft copolymer particle as claimed in claim 1 , wherein graft chain includes a structural unit having at least one functional group selected from the group consisting of an amino group, an amide group, an ether group, a carboxyl group, a thiourea group, an isothiourea group, a phosphoric acid group, a phosphonic acid group, an amidoxime group, a nitrile group, a sulfonyl group, an N-methylglucamine group, an epoxy group and a thiol group.

5. The porous graft copolymer particle as claimed in claim 4 , wherein the graft chain comprises a structural unit having at least one functional group selected from the group consisting of an amino group, an ether group, an isothiourea group and a thiourea group.

6. The porous graft copolymer particle as claimed in claim 3 , wherein the number of moles of the functional group per unit mass of the porous graft polymer particles is 1.0 mmol/g or more.

7. The porous graft copolymer particle as claimed in claim 1 , wherein the particle size is from 10 μm to 2,000 μm.

8. An adsorbent comprising the porous graft copolymer particle of claim 1 .

9. The adsorbent as claimed in claim 8 , wherein the adsorbent is an adsorbent for metal adsorption.

10. The porous graft copolymer particle of claim 1 , wherein the average pore diameter is from 0.2 μm to 10 μm.

11. The porous graft copolymer particle of claim 4 , wherein the number of moles of the functional group per unit mass of the porous graft copolymer particle is 2.0 mmol/g or more.

Assignees

• Kuraray Co

Inventors

• Morikawa Keisuke
• Amano Yusuke
• Iwachido Naoyuki
• Fujiwara Naoki
• Takayama Takumi

Classifications

• C08F220/54

  Amides {, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide} · CPC title

• C08J9/26

  by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out · CPC title

• C08F220/32

  containing epoxy radicals · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title

• C08J2201/046

  Elimination of a polymeric phase · CPC title