Patent ID: 8258249

Claim:
A superabsorbent polymer comprising: i) acrylic acid, wherein said acrylic acid is made by the process comprising the steps of: A heating an aqueous glycerine solution before entry into a dehydration reactor to a temperature of from 250° C. to 310° C. to form glycerine; B transporting the glycerine of step A to the dehydration reactor; C dehydrating the glycerine of step B to an acrolein-comprising dehydration product wherein the dehydrating occurs along a path wherein the glycerine concentration decreases, wherein along this path a pressure change occurs, and different flow rates exist; D gas phase oxidating of the acrolein-comprising dehydration product to obtain an acrylic acid-comprising monomer gas; E bringing into contact of the monomer gas with a quench agent to obtain an acrylic acid-comprising quench phase; F working-up the quench phase to obtain an acrylic acid-comprising monomer phase; and G polymerizing the acrylic acid-comprising monomer phase; wherein at least about 25% of the acrylic acid is based on glycerine; and ii) allyloxypolyethyleneglycol acrylic acid ester; wherein during the dehydration a liquid phase al and a gas phase a2 is present; wherein in the liquid phase a1, a plurality of gas bubbles is generated; wherein the dehydration occurs at least partially in the liquid phase; wherein the superabsorbent polymer has a biodegradability determined according to the modified Sturm-test according to appendix V to Guideline 67/548/EEC after 28 days of at least 25%; and wherein the superabsorbent polymer has a sustainability factor of at least about 80%.