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US 8,710,212 B2Granted
Starch networks as absorbent or superabsorbent materials and their preparation by extrusion
AssigneeArcher Daniels Midland Company
InventorsClaude Thibodeau, David Bergeron, Isabelle Bolduc, Claude Couture, Nicolas Nourry
Life of this patent
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Abstract
The present invention relates an absorbent material consisting of a molecular network of starch molecules, the starch molecules comprising an amylopectin content of at least 90% (w/w). The molecular network can either be comprised of self-entangled starches or cross-linked starches.
Claims9
An absorbent material comprising:
- particles formed from an extruded network of either cross-linked or self-entangled starch molecules, containing, at least 90% (w/w) of amylopectin;
- said starch molecules are gelatinized during an extrusion;
- and said particles range in size from 89 μm to 589 μm, and exhibit a free swell capacity (FSC) of at least 13 g/g and a centrifuge retention capacity (CRC) of at least 10 g/g in a 0.9% saline solution.
Dependencies are inferred from the claim text.