This invention relates to a superabsorbent polymer composition and a method for preparing the superabsorbent polymer composition. According to the present disclosure, there are provided a superabsorbent polymer composition that can exhibit a rapid absorption time without using a blowing agent, and a method for preparing the superabsorbent polymer composition.

A super absorbent polymer according to the present invention has an excellent discoloration resistance property 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.

Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order are disclosed. (A) 0.1 g of water-absorbent resin particles are uniformly scattered in a colorless and transparent round cell for a color-difference meter having an inner diameter of 30 mm. (B) 5.0 g of ion-exchanged water is added to the round cell to cause the water-absorbent resin particles to absorb water. (C) a brightness L* of an obtained gel is measured on a black background after five minutes from the addition of the ion-exchanged water.

Provided are a superabsorbent polymer exhibiting more improved absorption rate and liquid permeability as well as excellent basic absorption performance, and a preparation method thereof. The superabsorbent polymer includes a base polymer powder including a crosslinked polymer of water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized; and a surface crosslinked layer which is formed on the base polymer powder and in which the base polymer powder is additionally crosslinked via a surface crosslinking agent, wherein the superabsorbent polymer includes 10% by number or more of superabsorbent polymer particles each particle having an aspect ratio of less than 0.5, the aspect ratio defined as the shortest diameter/the longest diameter of the superabsorbent polymer particle, and has SFC in a predetermined range.

The present invention provides for a water retention polymer capable of retaining water for long durations and in huge amounts and the method of preparing the same. The polymer is capable of releasing the retained water slowly and as per the requirements of the crop and soil. Thus, the water retention polymer minimizes the water requirement during irrigation and other purposes. Further, the said polymer is eco-friendly, pollution free and completely biodegradable. The polymer can be used to grow plants on barren lands and marble slurry. The use of this polymer also minimizes the requirement of fertilizer for the crops. Further, the said water retention polymer is low-priced and hence affordable by farmers. The reduction in water requirement and fertilizer due to the use of this water retention polymer reduces 60% overall production cost for the farmers and hence results in more income generation from agriculture.

The present disclosure relates to a preparation method of a super absorbent polymer composition. More specifically, it relates to a preparation method of a super absorbent polymer composition capable of pulverizing the hydrogel polymer to a normal particle size without agglomeration between particles by adding an additive having a specific structure, reducing manufacturing cost by simultaneously performing a drying process and a surface cross-linking process, and significantly reducing the amount of fine powder generated during the process.

A process for producing superabsorbents, comprising polymerization of a monomer solution and thermal surface postcrosslinking, wherein the monomer solution comprises at least 0.75% by weight of a hydroxyphosphonic acid or salts thereof, calculated on the basis of the total amount of monomer used, and at least 0.09% by weight of aluminum cations, calculated on the basis of the total amount of polymer particles used, is added to the polymer particles before, during or after the thermal surface postcrosslinking.

Provided is a method for producing an absorbent article comprising a water-absorbing resin having an excellent initial water absorption speed under load even substantially without adding a liquid permeability enhancer.

The method steps for producing the water-absorbing resin includes the step of polymerizing a monomer while adding certain polyalkylene glycol thereto so as to generate, during or after the polymerization, a crosslinked hydrogel polymer containing the polyalkylene glycol of a specific molecular weight, wherein the crosslinked hydrogel polymer has a centrifuge retention capacity within a given range and a final water-absorbing resin to be obtained has various physical properties (CRC, AAP, SFC, FSR) being within given ranges.

Provided is a method for producing a water-absorbing resin powder excellent in water absorption speed. The method for producing a water-absorbing resin powder includes a polymerization step of polymerizing an aqueous monomer solution to obtain a crosslinked hydrogel polymer and a gel-crushing step of crushing the crosslinked hydrogel polymer after the polymerization step using a gel-crushing device to obtain a crosslinked particulate hydrogel polymer, in which the gel-crushing device includes an input port, a discharge port, and a main body incorporating a plurality of rotation axes each including a crusher, and in the gel-crushing step, the crosslinked hydrogel polymer is continuously put into the input port and the crosslinked particulate hydrogel polymer is continuously taken out from the discharge port, the crosslinked hydrogel polymer to be put into the input port has a rate of polymerization of 90 mass % or more, a gel-crushing coefficient is 0.020 J/g.Math.sec or more and 3.0 J/g.Math.sec or less, and the crosslinked particulate hydrogel polymer discharged from the discharge port has a mass average particle diameter of 500 m or less as converted to a solid content.

An absorbent core composite is disclosed for incorporation into a disposable absorbent article. The composite includes a first material layer and a second material layer (preferably nonwoven) partially secured to the first material layer to define at least one pocket therebetween. Preferably, multiple pockets are defined, except in the case of where a generally uniform layer or bed of absorbent is preferred or better suited fro the application. The pocket is said have a fixed initial volume. Further, an aggregate of absorbent particles is provided in the pocket(s) to occupy a portion of the fixed initial volume. The absorbent particles are preferably SAP particles and is characterized by a dry volume associated with a dry state and a swell volume associated with a liquid saturation state. In respect to or for the pocket, the aggregate is characterized by a collective dry volume and a collective swell volume, wherein the pocket has an initial configuration that retains the aggregate therein.