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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.
1-27. (canceled)
An absorbent particle comprising a carboxyalkyl starch that has been permeated with an acidic gas, wherein said particle comprises an inner core region and an outer surface region surrounding the core region, and has a relative amount of intramolecular ester bonds that is greater at the surface region than the inner core region, wherein the intramolecular ester bonds do not comprise a cross linking agent.
The particle of 36, wherein the relative chlorine concentration is higher at the surface of the particle than in the inner core of the particle when measured by zero second Argon abrading time in comparison to 5400 second Argon abrading time as determined by XPS with the same amount of material taken from the surface and the inner core region of the particle.
A process for the manufacture of a superabsorbent polymer comprising:
Dependencies are inferred from the claim text.