Patent ID: 8815770
Filing Date: 2014-08-26
Classification: A61L,C08K

Abstract:
1. A superabsorbent produced by polymerizing a monomer mixture comprising (a) at least one ethylenically unsaturated monomer bearing at least one acid group neutralized from 25 to 95 mol % as an alkali metal or ammonium salt and (b) at least 1% by weight and at most 5%, by weight, of at least one alkaline earth metal salt (calculated without water of crystallization) based on the total amount of ethylenically unsaturated monomer bearing at least one acid group (calculated as the free acid), the at least one alkaline earth metal salt selected from the salts of calcium, strontium, and barium, and the at least one alkaline earth metal salt having been added after neutralization of the monomer and during the polymerization and/or, if the polymerization is followed by a separate drying step, to the polymer before the drying.