Invention Grant
- Patent Title: Process for superabsorbent polymer and crosslinker composition
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Application No.: US13780672Application Date: 2013-02-28
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Publication No.: US08476189B1Publication Date: 2013-07-02
- Inventor: Matthias Naumann , Stanley A. McIntosh , Frank Schubert , Christoph Loick
- Applicant: Evonik Stockhausen, LLC
- Applicant Address: US NC Greensboro
- Assignee: Evonik Stockhausen LLC
- Current Assignee: Evonik Stockhausen LLC
- Current Assignee Address: US NC Greensboro
- Agency: Smith Moore Leatherwood LLP
- Agent Philip P. McCann
- Main IPC: B01J20/00
- IPC: B01J20/00

Abstract:
The present invention further relates to a process to make a superabsorbent polymer comprising the steps of a) preparing a neutralized monomer solution comprising a polymerizable monomer selected from unsaturated acid groups-containing monomers, ethylenically unsaturated carboxylic acid anhydride, salts, or derivatives thereof and a caustic agent selection from an alkali agent, wherein the polymerizable monomer is neutralized to from about 50 mol % to about 85 mol %; b) forming a crosslinker monomer mixture by adding an internal crosslinker composition to the neutralized monomer solution wherein the internal crosslinking composition is the reaction product of a stoichiometric excess of amine with a glycidyl compound, wherein the internal crosslinker composition has a residual amount of glycidyl compounds of less than about 500 ppm based on the mass of the internal crosslinker composition; and c) polymerizing the crosslinker monomer mixture to make a superabsorbent polymer.
Public/Granted literature
- US20130172180A1 PROCESS FOR SUPERABSORBENT POLYMER AND CROSSLINKER COMPOSITION Public/Granted day:2013-07-04
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