Provided are a water-absorbent resin easily separable from a recyclable resource in recovering the recyclable resource, and an absorbent article containing an absorbent material containing the water-absorbent resin. The water-absorbent resin according to the present invention has such a structure that a polymer formed from a water-soluble ethylenically unsaturated monomer is crosslinked by using a post-crosslinking agent. The water-absorbent resin has (1) a water-retention capacity for physiological saline of 35 g/g or more, (2) a water-absorption capacity for physiological saline under a load of 4.14 kPa of 10 mL/g or more, (3) an initial gel viscosity of 3000 mPa.Math.s or more, and (4) a gel decomposition index of 0.60 or less: gel decomposition index=B/A wherein A represents an initial gel viscosity (mPa.Math.s), and B represents a gel viscosity after one day (mPa.Math.s).

Provided are a water-absorbent resin easily separable from a recyclable resource in recovering the recyclable resource, and an absorbent article containing an absorbent material containing the water-absorbent resin. The water-absorbent resin according to the present invention has such a structure that a polymer formed from a water-soluble ethylenically unsaturated monomer is crosslinked by using a post-crosslinking agent. The water-absorbent resin has (1) a water-retention capacity for physiological saline of 35 g/g or more, (2) a water-absorption capacity for physiological saline under a load of 4.14 kPa of 10 mL/g or more, (3) an initial gel viscosity of 3000 mPa.Math.s or more, and (4) a gel decomposition index of 0.60 or less: gel decomposition index=B/A wherein A represents an initial gel viscosity (mPa.Math.s), and B represents a gel viscosity after one day (mPa.Math.s).

Provided are a polymer having ultraviolet absorption functionality and preparation method thereof; specifically, three monomers having different ultraviolet absorption bands are used for copolymerization, achieving a significant expansion of the ultraviolet absorption range and achieving the effect of full-band ultraviolet shielding. The obtained polymer film has strong visible light transmittance, fluorescence, easy processing, excellent stability, and remarkable ultraviolet shielding performance, and can be broadly applied in such areas as aviation, construction, agriculture, and optical devices.

Provided are a polymer having ultraviolet absorption functionality and preparation method thereof; specifically, three monomers having different ultraviolet absorption bands are used for copolymerization, achieving a significant expansion of the ultraviolet absorption range and achieving the effect of full-band ultraviolet shielding. The obtained polymer film has strong visible light transmittance, fluorescence, easy processing, excellent stability, and remarkable ultraviolet shielding performance, and can be broadly applied in such areas as aviation, construction, agriculture, and optical devices.

A Polymer used as a pesticide means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.

A Polymer used as an anti-fouling means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.

A Polymer used as an anti-infective means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.

A Polymer used as a barrier means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.

A Polymer used as a fertilizer means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.

A Polymer used as a photographic means, having an acid number greater than 100. The Polymer has a valent metal ion which is bonded to at least one reactive group. The characteristics of the Polymer include, conductivities of 4 S/cm to 200 S/cm or more, depending upon the concentration and nature of the metal bound. The conductivity proportional to the amount of metal bound, the ability of the Polymer to bind metals having a +1, +2, +3, +4, or +5 valence charge to the Polymer, and the ability to bind two or more different metals to separate binding sites on the Polymer.