Patent ID: 11931720
Assignee: LG CHEM, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 6:
7. The method for preparing superabsorbent polymer according to claim 1, wherein the superabsorbent polymer has a permeability (unit: seconds) measured according to the following Equation 1, of 35 seconds or less:

Permeability (sec)=T1−B  [Equation 1]

wherein in the Equation 1,
T1 is a time taken until the height of a liquid level decreases from 40 ml to 20 ml, after putting 0.2±0.0005 g of a sieved (30 #˜50 #) superabsorbent polymer sample in a chromatography column and adding brine to the volume of 50 ml, and then, leaving it for 30 minutes; and B is a time taken until the height of a liquid level decreases from 40 ml to 20 ml in a chromatography column filled with brine.