Process for post-crosslinking of a water absorbing polymer surface with a cyclic urea useful in foams, fibers, films, cables, especially sealing materials and liquid absorbing hygiene articles

摘要

A process for post-crosslinking of part of a surface of a water absorbing polymer in which the polymer is brought into contact with a post-crosslinker solution at a temperature of 50-300 degrees C, where the post-crosslinker is a cyclic urea is new. A process for post-crosslinking of part of a surface of a water absorbing polymer in which the polymer is brought into contact with a post-crosslinker solution at a temperature of 50-300 degrees C, where the post-crosslinker is a cyclic urea of formula (I); x = 2 or 3; and R1 and R2 = H or 1-4C alkyl.