HYDROGELS COATED WITH STERIC OR ELECTROSTATIC SPACERS

摘要

The invention relates to non-water soluble hydrogels which can swell in wate r, and which are coated with steric or electrostatic spacers. Before being coated, the hydrogels comprise the following characteristics: absorbency und er load (AUL) (0.7 psi) of at least 20 g/g, and gel strength of at least 1600 P a. The coated hydrogels preferably have the following characteristics: centrifu ge retention capacity (CRC) of at least 24 g/g, saline flow conductivity (SFC) of at least 30 x 10-7 cm3 s/g, and free swell rate (FSR) of at least 0.15 g/g s and/or a maximum vortex time of 160 s.