Evonik Stockhausen Gmbh

Evonik Corporation

Michael S Jarman

Scott J Smith

Mark Joy

Michael M Azad

Geoffrey Wyatt Blake

A process for the preparation of superabsorbent polymer containing clay, the process including the steps of (I) polymerizing a polymerization mixture comprising: (a) one or more ethylenically unsaturated carboxyl-containing monomers, (b) one or more crosslinking agents, (c) optionally one or more comonomers copolymerizable with the carboxyl-containing monomer, (d) neutralizing agent to partially neutralize the polymer to from about 50% to about 99%, by weight, and (e) a polymerization medium, to form a crosslinked partially neutralized hydrogel, (II) admixing a clay with the crosslinked partially neutralized hydrogel to form partially neutralized superabsorbent polymer-clay hydrogel; (III) drying the crosslinked partially neutralized hydrogel at a temperature from about 190&#xb0; C. to about 210&#xb0; C. and for a time period of from about 15 minutes to about 120 minutes, and (IV) comminuting the dried partially neutralized superabsorbent polymer-clay hydrogel to particles.

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Michael S Jarman