Patent ID: 6254990
Filing Date: 2001-07-03
Classification: C08J,Y10T

Abstract:
A surface-crosslinking process for a water-absorbent resin, comprising the steps of:a) providing a starting dry water-absorbent resin powder, wherein the starting dry water-absorbent resin powder has a weight-average particle diameter of 200 to 1,000 .mu.m;b) providing a surface-crosslinking agent;c) mixing the surface-crosslinking agent with the starting dry water-absorbent resin powder to obtain a mixture;d) pulverizing the mixture; ande) while pulverizing the mixture, carrying out a surface crosslinking reaction between the surface-crosslinking agent and the starting dry water-absorbent resin powder to obtain a dry water-absorbent resin powder product comprising surface-crosslinked particles where a neighborhood of a surface of said particle is crosslinked.