Water-absorbent starches
First Claim
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1. A method for preparing a water-absorbent starch product, said method comprising:
- a. forming an aqueous dispersion comprising starch, water, free-radical initiator and ethylenically unsaturated monomer wherein the monomer consists essentially of monomer having a boiling point of at least 100°
C.; and
b. simultaneously polymerizing and drying the aqueous dispersion at a temperature above 100°
C. to provide a dry, water-absorbent starch product or precursor thereof.
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Abstract
Water-absorbent starch products may be prepared by simultaneously drying and polymerizing an aqueous media containing starch, ethylenic unsaturated monomer and free-radical initiator. Without necessitating further refining or chemical modification, effective water-absorbent, drum-dried products essentially free from water-soluble salts and free-radical initiator contaminants and containing a high level of functional water-attractant groups may be directly manufactured. If desired, the water-absorbent starch products may be further refined to increase the water-absorbent properties of the starch polymer.
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14 Claims
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1. A method for preparing a water-absorbent starch product, said method comprising:
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a. forming an aqueous dispersion comprising starch, water, free-radical initiator and ethylenically unsaturated monomer wherein the monomer consists essentially of monomer having a boiling point of at least 100°
C.; andb. simultaneously polymerizing and drying the aqueous dispersion at a temperature above 100°
C. to provide a dry, water-absorbent starch product or precursor thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification