Production of water-absorbing polymeric particles
AssigneeBASF SE
InventorsUlrich Riegel, Thomas Daniel, Dieter Hermeling, Mark Elliott
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Abstract
The present invention relates to a process for producing water-absorbing polymeric particles by polymerizing a monomer solution, which comprises removing the polymer gel from the reactor when the gel temperature is at least 50° C. and the monomer conversion is not more than 90 mol %, and also to a process for producing hygiene articles.
Claims17
A process for producing water-absorbing polymeric particles by reacting a monomer solution to form a polymer gel, which comprises (a) removing the polymer gel from a reactor when the temperature of the polymer gel formed in the course of the polymerization is at least 50° C. and before attaining a peak temperature, and monomer conversion is not more than 90 mol %, (b) dividing the polymer gel, and (c) storing the divided polymer gel under an inert gas and/or at a reduced pressure for 0.2 to 12 hours to supplementarily react the monomer in the absence of shearing.
Dependencies are inferred from the claim text.