Super absorbent polymer
AssigneeLG Chem, Ltd.
InventorsKyungchan Min, Tae Yun Kim, Byoung Hyoun Kim, Sung Soo Park, Byung Hyun Park
Life of this patent
Estimating the term…
Abstract
A polyacrylic acid (salt)-based super absorbent polymer has a swelling factor (SF) value of 85 to 110 derived by Equation 1. Equation 1 is SF=1+[(7,700/w)×(AS-AR)/AS], wherein w is a weight (mg) of the super absorbent polymer, AS is an absorbance at 620 nm of a solution obtained by centrifuging an aqueous solution including the polyacrylic acid (salt)-based super absorbent polymer and Blue dextran under a condition of 200 G to 280 G, and AR is an absorbance at 620 nm of an aqueous solution including the Blue dextran, which is a reference sample.
Claims13
A polyacrylic acid (salt)-based super absorbent polymer having a swelling factor (SF) value of 90 to 110 derived by Equation 1 below:
- S
-
- F
- =
- 1
- +
- [
- (
- 7
- ,
- 700
- /
- w
- )
- ×
- (
- A
- S
- -
- A
- R
- )
- /
- A
- S
- ]
- [
- Equation
-
- 1
- ]
- wherein in [Equation 1] above,
- w is a weight (mg) of the super absorbent polymer,
- AS is an absorbance at 620 nm of a solution obtained by centrifuging an aqueous solution including the polyacrylic acid (salt)-based super absorbent polymer and Blue dextran under a condition of 200 G to 280 G, and
- AR is an absorbance at 620 nm of an aqueous solution including the Blue dextran, which is a reference sample;
- and
- wherein when the polyacrylic acid (salt)-based super absorbent polymer is swollen for 1 minute with water having an electrical conductivity value of 100 μS/cm to 130 μS/cm, a free swell capacity of the water absorbed by the polyacrylic acid (salt)-based super absorbent polymer is 175 g or more.
Dependencies are inferred from the claim text.