Patent ID: 6054541
Filing Date: 2000-04-25
Classification: A61F,A61L,C08F

Abstract:
A process of manufacturing a precursor of an absorbing agent, comprising the step of:performing an aqueous solution polymerization of a hydrophilic unsaturated monomer having at least 50 mole percent neutralized acrylic acid as a main component in a presence of a dispersant, using a crosslinking agent composed of a main component and a high-boiling point component in an amount in a range of not less than 0.05 mole percent and not more than 0.5 mole percent with respect to a total amount of the hydrophilic unsaturated monomer,wherein a ratio in weight of the main component of said crosslinking agent to a high-boiling point compound is in a range of 75/25 to 99/1,a main component of said crosslinking agent is composed of an ester compound including a polyhydroxy alcohol having not more than six carbon atoms and at least three hydroxy groups, and an unsaturated carboxylic acid,a ratio in molecular weight of the main component of said crosslinking agent to a standard compound is not less than 0.7 and less than 1.3 based on a molecular weight of the standard compound wherein all hydroxy groups of the polyvalent alcohol are ester-linked to the unsaturated carboxylic acid, andsaid high-boiling point component includes at least two alcohol structures in a molecule.