Archer Daniels Midland Company

Danick Godin

George Koutlakis

Nicolas Nourry

Andre Laforest

Anne-Claude Couffin

Isabelle Bolduc

Vladimiro Nettel

Shuojia Dong

Oscar Suarez-Hernandez

André Laforest

Frédéric Picard

Nicole Lachapelle

Caroline Lavergne

Catherine Theriault

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&#xb0; 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&#xb0; 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.

Acidic gas-permeated carboxyalkyl starch particles, extrudates, and process for making the same

Acidic gases permeated carboxyalkyl starch and alkaline starch extrudates and process for making the same

Surface-treated carboxyalkylated polysaccharides comprising a biobased content of at least 82% are described herein. The surface-treated carboxyalkylated polysaccharides comprise a CRC of at least 18 g/g, a FSC of at least 26 g/g, and an AUL at 0.7 psi of at least 14 g/g. Processes for the manufacture of surface-treated carboxyalkylated polysaccharides are also described herein.

Superabsorbent surface-treated carboxyalkylated polysaccharides and process for producing same

Growing community of inventors

St-Bruno-de-Montarville, Canada

Danick Godin