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AssigneeArcher Daniels Midland Company
InventorsDanick Godin, George Koutlakis, Nicolas Nourry
Estimating the term…
The present disclosure relates to particles comprising carboxyalkyl starch that are permeated with an acidic gas and their uses as absorbent materials. It was discovered that superabsorbent materials could be obtained from carboxyalkyl starch particles permeated with the acidic gas and heated to a temperature of at least 100° C. until they reach an AUL at 0.7 psi. of at least 14 g/g and a CRC of at least 18 g/g. Moreover, it was discovered that the pH of alkaline starch extrudates can be adjusted by permeating particles of the extrudate with the acidic gas even with treating the particles to temperatures less than 100° C. The carboxyalkyl starch particles obtained by the methods described herein are characterized as having intramolecular ester bonds, which are greater in number at the surface of the particle than in the core, and the particles have a greater concentration of cation of the acidic gas at the surface than a the core.
An absorbent product comprising an absorbent particle of a carboxyalkyl starch that has been permeated with an acidic gas, wherein said particle exhibits 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 intramolecular ester bonds do not comprise a cross linking agent, and co-absorbent material.
A method for absorbing a liquid comprising contacting the liquid with the absorbent particles that exhibits a relative amount of intramolecular ester bonds that is 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 liquid is selected from the group consisting of water, aqueous solutions, physiological fluids and saline solutions.
A process for the manufacture of a superabsorbent polymer comprising:
Dependencies are inferred from the claim text.