Polyethylenimine coated polymeric beads

Patent metadata

Field	Value
Publication number	US-2021229033-A1
Application number	US-201816972020-A
Country	US
Kind code	A1
Filing date	Jul 4, 2018
Priority date	Jul 4, 2018
Publication date	Jul 29, 2021
Grant date	—

Abstract

Polyethylenimine coated polymeric beads comprising a polymer that comprises, based on the weight of the polymer, from 25% to 75% by weight of structural units of an acetoacetoxy or acetoacetamide functional monomer, and from 25% to 75% by weight of structural units of a polyvinyl monomer; the polyethylenimine having a number average molecular weight of 300 g/mol or more; the polyethylenimine coated polymeric beads having a specific surface area in the range of from 20 to 400 m2/g; a process of preparing the polyethylenimine coated polymeric beads; a gas filter device comprising the polyethylenimine coated polymeric beads as a filter medium; and a method of removing aldehydes from air containing aldehydes, comprising contacting the air with the polyethylenimine coated polymeric beads.

First claim

What is claimed is:

1 . Polyethylenimine coated polymeric beads comprising a polymer, wherein the polymer comprises, based on the weight of the polymer,
from 25% to 75% by weight of structural units of an acetoacetoxy or acetoacetamide functional monomer, and from 25% to 75% by weight of structural units of a polyvinyl monomer; wherein the polyethylenimine has a number average molecular weight of 300 g/mol or more; and wherein the polyethylenimine coated polymeric beads have a specific surface area in the range of from 20 to 400 m 2 /g.

2 . The polyethylenimine coated polymeric beads of claim 1 , wherein the polymeric beads have a specific surface area in the range of from 40 to 250 m 2 /g.

3 . The polyethylenimine coated polymeric beads of claim 1 , wherein the polyethylenimine has a structure of formula (II),

where n, m, p, and x are each independently an integer of from 0 to 1,000, provided that n+m+p+x>5.

4 . The polyethylenimine coated polymeric beads of claim 1 , wherein the number average molecular weight of the polyethylenimine is in the range of from 300 to 10,000 g/mol.

5 . The polyethylenimine coated polymeric beads of claim 1 , wherein the acetoacetoxy or acetoacetamide functional monomer is selected from the group consisting of acetoacetoxyethyl methacrylate, acetoacetoxyethyl acrylate, acetoacetoxypropyl methacrylate, allyl acetoacetate, acetoacetoxybutyl methacrylate, and 2,3-di(acetoacetoxy)propyl methacrylate.

6 . The polyethylenimine coated polymeric beads of claim 1 , wherein the polyvinyl monomer is selected from the group consisting of divinylbenzene, trivinyl benzene, divinylnaphthalene, trimethylolpropane trimethacrylate, allyl (meth)acrylate, tripropylene glycol dimethacrylate, diethylene glycol dimethacrylate, ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,3-butylene glycol dimethacrylate, and 1,4-butylene glycol di(meth)acrylate.

7 . The polyethylenimine coated polymeric beads of claim 1 , wherein the polymer comprises, based on the weight of the polymer, from 30% to 70% by weight of structural units of the acetoacetoxy or acetoacetamide functional monomer, from 30% to 70% by weight of structural units of the polyvinyl monomer, and from 0 to 20% by weight of structural units of a monovinyl aromatic monomer.

8 . The polyethylenimine coated polymeric beads of claim 1 , having a number average particle size of from 200 to 5,000 μm.

9 . A process for preparing the polyethylenimine coated polymeric beads of claim 1 , comprising,
(i) suspension polymerization of monomers in the presence of a porogen, wherein the monomers comprise, based on the total weight of monomers, from 25% to 75% by weight of an acetoacetoxy or acetoacetamide functional monomer, and from 25% to 75% by weight of a polyvinyl monomer; and (ii) contacting the obtained polymer from step (i) with a polyethylenimine to give the polyethylenimine coated polymeric beads; wherein the polyethylenimine has a number average molecular weight of 300 g/mol or more; and wherein the polyethylenimine coated polymeric beads have a specific surface area in the range of from 20 to 400 m 2 /g.

10 . The process of claim 9 , wherein the polyethylenimine is used in an amount of from 0.1% to 15%, by weight based on the weight of the polymer.

11 . The process of claim 9 , wherein the polyethylenimine has a structure of formula (II),

where n, m, p, and x are each independently an integer of from 0 to 1,000, provided that n+m+p+x>5.

12 . The process of claim 9 , wherein the number average molecular weight of the polyethylenimine is in the range of from 300 to 10,000 g/mol.

13 . The process of claim 9 , wherein the porogen is selected from the group consisting of diisobutyl ketone, toluene, butyl acetate, isooctane and methyl butyl ketone.

14 . A gas filter device comprising the polyethylenimine coated polymeric beads of claim 1 as a filter medium.

15 . A method of removing aldehydes from air containing aldehydes, comprising contacting the air with the polyethylenimine coated polymeric beads of claim 1 .

Assignees

• Dow Global Technologies Llc

Inventors

• Zhang Ji Guang
• Zou Jian
• Chen Hongyu
• Feng Shaoguang
• Yao Wenbin
• Li Haiying
• Zhai Xuemei

Classifications

• B01J20/28059

  being less than 100 m2/g · CPC title

• B01J20/3272

  Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds · CPC title

• B01J20/321

  consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds · CPC title

• B01J20/28061

  being in the range 100-500 m2/g · CPC title

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title