A surface-modified water-absorbent resin powder is produced continuously with high productivity in a state where the particle diameter distribution is narrow and where the properties are high by a process comprising a polymerizing step, a drying step, a pulverizing step, a classifying step, and a surface-modifying...http://www.google.com.au/patents/US6727345?utm_source=gb-gplus-sharePatent US6727345 - Continuous production process for water-absorbent resin powder and powder surface detector used therefor
