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US 2019/0100627 A1Published application
Super Absorbent Polymer
AssigneeLG Chem, Ltd.
InventorsKyu Pal Kim, Gi Cheul Kim, Won Mun Choi, Ki Hyun Kim, Seul Ah Lee, Won Taeck Lim
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Abstract
The present invention relates to a superabsorbent polymer exhibiting excellent heat stability.
Claims8
A superabsorbent polymer comprising:
- a base resin powder comprising crosslinked polymer formed by the crosslinking polymerization of water soluble ethylenically unsaturated monomers having acid groups of which at least a part are neutralized, in the presence of an internal crosslinking agent comprising a compound represented by the following Chemical Formula 1 in the content of 80 wt % or more, based on the total weight of the internal crosslinking agent;
- and
- a surface crosslink layer on the base resin powder, formed by the additional crosslinking of the crosslinked polymer,
- wherein absorption property change rate at high temperature (Y) calculated by the following Calculation Formula 1 is −8% to 8%:
- in the Chemical Formula 1, R1 is a divalent organic group derived from C1-10 alkane, and R2 is hydrogen or a methyl group,
- Y={[P1−P2]/P1}*100 [Calculation Formula 1]
- in the Calculation Formula 1,
- Y is absorption property change rate at high temperature,
- P1 the sum of centrifuge retention capacity (CRC) of the superabsorbent polymer to a saline solution, and absorbency under load (AUL) of 0.7 psi of the superabsorbent polymer to a saline solution, measured before exposed to high temperature, and
- P2 is the sum of CRC and AUL of the superabsorbent polymer, measured after leaving the superabsorbent polymer in an oven of 185° C. for 60 minutes.
7 more elements
A superabsorbent polymer comprising:
- a base resin powder comprising crosslinked polymer formed by the crosslinking polymerization of water soluble ethylenically unsaturated monomers having acid groups of which at least a part are neutralized, in the presence of an internal crosslinking agent comprising a compound represented by the following Chemical Formula 1 in the content of 80 wt % or more, based on the total weight of the internal crosslinking agent;
- and
- a surface crosslink layer on the base resin powder, formed by the additional crosslinking of the crosslinked polymer,
- wherein absorption property change rate at high temperature (Y) calculated by the following Calculation Formula 1 is −8% to 8%, and P1 in the Calculation Formula 1 is 60 to 85 g//g:
- in the Chemical Formula 1, R1 is a divalent organic group derived from C1-10 alkane, and R2 is hydrogen or a methyl group,
- Y={[P1−P2]/P1}*100 [Calculation Formula 1]
- in the Calculation Formula 1,
- Y is absorption property change rate at high temperature,
- P1 the sum of centrifuge retention capacity (CRC) of the superabsorbent polymer to a saline solution, and absorbency under load (AUL) of 0.7 psi of the superabsorbent polymer to a saline solution, measured before exposed to high temperature, and
- P2 is the sum of CRC and AUL of the superabsorbent polymer, measured after leaving the superabsorbent polymer in an oven of 185° C. for 60 minutes.
7 more elements
Dependencies are inferred from the claim text.