Water-absorbent resin and production process therefor

A production process for a water-absorbent resin, comprising the steps of:

• blending a liquid material and a water-absorbent resin;
• and heating the resultant mixture to produce a modified water-absorbent resin,
• with the production process comprising the steps of:
• spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C);
• and heat-treating,
• wherein the liquid material (B) is sprayed from the spray nozzle (C) in a circular and hollow cone shaped spray pattern in the spray-blending step, and wherein the heat-treating step is carried out under an atmosphere having a dew point of not higher than 60° C. and a temperature of not lower than 90° C.

A production process for a water-absorbent resin, comprising the steps of:

• blending a liquid material and a water-absorbent resin;
• and heating the resultant mixture in order to produce a modified water-absorbent resin,
• with the production process comprising the steps of:
• spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C);
• and heat-treating,
• wherein the liquid material (B) is sprayed from the spray nozzle (C) in a double-convex-lens and elliptical cone shaped spray pattern in the spray-blending step, and wherein the heat-treating step is carried out under an atmosphere having a dew point of not higher than 60° C. and a temperature of not lower than 90° C., and wherein said spray nozzle (C) is attached to said blending apparatus to form a spray angle of not less than 50° onto an area on said water-absorbent resin, when said dispersing area of a spray-dispersing state is projected onto a sectional area perpendicular to a transfer direction of said water absorbent resin.