Back to results
US 2019/0100629 A1Published application
Super Absorbent Polymer And Method For Producing Same
AssigneeLG Chem, Ltd.
InventorsDae Woo Nam, Seon Jung Jung, Tae Hwan Jang, Jun Kyu Kim, Seong Beom Heo, Bo Hyun Seong, Yeon Woo Hong, Su Jin Kim, Ji Yoon Jeong, Hyung Ki Yoon
Life of this patent
Estimating the term…
Abstract
A super absorbent polymer according to the present invention has an excellent discoloration resistance characteristic even under high temperature/high humidity conditions, while maintaining excellent absorption performance, and is preferably used for hygienic materials such as diapers, and thus can exhibit excellent performance.
Claims12
A super absorbent polymer comprising:
- a base polymer powder comprising a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups;
- and
- a surface cross-linked layer formed on the base polymer powder and comprising a second cross-linked polymer in which the first cross-linked polymer is further cross-linked via a surface crosslinking agent, a sulfonate derivative and a sulfinate derivative,
- wherein a vortex time measured according to the measurement method of Vortex is 25 to 50 seconds,
- wherein an extractable content measured according to EDANA method No. WSP 270.2 is 15% by weight or less,
- wherein in a CIE 1976 colorimetric system, an L value is 90 or more and a b value is 8 or less, and
- wherein in a CIE 1976 colorimetric system measured after the super absorbent polymer is left under a condition of a temperature of 90° C. and a relative humidity of 90% for 48 hours, an L value is 80 or more and a b value is 9 or less.
4 more elements
A super absorbent polymer comprising:
- a base polymer powder comprising a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups;
- and
- a surface cross-linked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further cross-linked via a surface crosslinking agent,
- wherein a vortex time measured according to the measurement method of Vortex is 25 to 50 seconds,
- wherein an extractable content measured according to EDANA method No. WSP 270.2 is 15% by weight or less,
- wherein in a CIE 1976 colorimetric system, an L value is 90 or more and a b value is 8 or less, and
- wherein in a CIE 1976 colorimetric system measured after the super absorbent polymer is left under a condition of a temperature of 90° C. and a relative humidity of 90% for 48 hours, an L value is 80 or more and a b value is 9 or less.
4 more elements
A method for producing a super absorbent polymer comprising:
- a step of crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent to form a hydrogel polymer containing a first crosslinked polymer;
- a step of drying, pulverizing and classifying the hydrogel polymer to form a base polymer power;
- and
- a step of heat-treating and surface-crosslinking the base polymer powder in the presence of a surface crosslinking solution comprising a surface crosslinking agent, a sulfinate derivative and a sulfonate derivative to form a super absorbent polymer particle.
1 more element
Dependencies are inferred from the claim text.