US 9,433,921 B2 · Method for preparing a super absorbent polymer

Abstract

The present invention relates to a method for preparing a super absorbent polymer. The method for preparing a super absorbent polymer according to the present invention comprises the steps of: carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator to form a hydrogel polymer; drying the hydrogel polymer; pulverizing the dried polymer; mixing a fine powder having a particle diameter of 180 μm or less and a polymer having a particle diameter of 300 μm or more among the pulverized polymer; and adding steam to the mixture to carry out a reassembling. According to the present invention, the super absorbent polymer having a high fine powder aggregation strength can be obtained.

Claims9

Dependent claims

A method for preparing a super absorbent polymer, comprising the steps of:

carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator to form a hydrogel polymer;
drying the hydrogel polymer;
pulverizing a dried polymer;
mixing a fine powder having a particle diameter of 180 μm or less and a polymer having a particle diameter of 300 μm or more among a pulverized polymer;
and adding steam to a mixture to carry out a reassembling.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/911,220Filed 17 Jul 2014

Priority

KR 10-2013-010191527 Aug 2013

Published

US 2016/0175813 A123 Jun 2016

Granted

6 Sep 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

B01J 20/267
Modified or post-treated polymers: cross-linked polymers
B01J 20/28016
Characterised by their form: particle form
C08F 2/10
Polymerisation in solution: aqueous solvent
C08F 6/008
Post-polymerisation treatments: treatment of solid polymer wetted by water or organic solvents, e.g. coagulum, filter cakes

Method for preparing a super absorbent polymer

Life of this patent

Method for preparing a super absorbent polymer

Life of this patent

Abstract

Claims9