Neutralization process
AssigneeBASF SE
InventorsMichael de Marco, Matthias Weismantel, Karl J. Possemiers, Filip Mees, Ronny De Kaey
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Abstract
The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is preneutralized at least partly with a base, wherein the preneutralized solution is divided into at least two part-solutions and at least one part-solution is aftertreated so as to form part-solutions with different degree of neutralization and/or solids content, and also to an apparatus for carrying out the process.
Claims19
A process for preparing two or more water-absorbing polymers in which at least one ethylenically unsaturated carboxylic acid in solution is preneutralized at least partly with a first base, optionally with addition of water, which comprises dividing the preneutralized solution into at least two part-solutions, at least one part-solution being aftertreated to form part-solutions with a different degree of neutralization and/or solids content, wherein each part-solution is independently polymerized to provide two or more different water-absorbing polymers, and wherein the degree of neutralization of the preneutralized solution is increased by adding a second base.
A process for preparing two or more water-absorbing polymers in which at least one ethylenically unsaturated carboxylic acid in solution is preneutralized at least partly with a base, optionally with addition of water, which comprises dividing the preneutralized solution into at least two part-solutions, at least one part-solution being aftertreated to form part-solutions with a different degree of neutralization and/or solids content, wherein each part-solution is independently polymerized to provide two or more different water-absorbing polymers, and wherein the solids content of the preneutralized solution is lowered by adding water.
Dependencies are inferred from the claim text.