Patent ID: 9149787
Filing Date: 2015-10-06
Classification: A61L,B01D,B01J,C08B,C08J,C08K

Abstract:
1. A process for the manufacture of a superabsorbent polymer comprising: obtaining a particle comprising carboxyalkyl starch; permeating the particle with an acidic gas; heating the particle to a temperature of at least 100° C., until the particle is characterized by an absorption under load at 0.7 psi of at least 14 g/g and a centrifuge retention capacity of at least 18 g/g; and generating in said particle a relative amount of intramolecular ester bonds that are evenly dispersed at an outer surface region and at a greater concentration at the outer surface region than an inner core region as a consequence of acidic gas-permeation, wherein the intermolecular ester bonds do not comprise a cross linking agent.