Expandable starch beads and method for preparing the same
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United States of America Patent
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Apr 28, 2015
Grant Date -
May 9, 2013
app pub date -
Jul 14, 2011
filing date -
Jul 15, 2010
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Abstract
Provided is expandable starch beads including a starch-monomer copolymer and a foaming agent impregnated in the starch-monomer copolymer, in which the starch-monomer copolymer is prepared by bonding at least one monomer selected from the group consisting of styrene, α-methylstyrene, lactide, lactic acid, acrylic acid, methacrylic acid, acrylic ester, methacrylic ester, acrylonitrile, acrylamide, and caprolactone to starch, and the foaming agent includes at least one selected from the group consisting of C2 to C7 aliphatic hydrocarbon, C2 to C7 halogenated hydrocarbon, and carbon dioxide. Since the expandable starch beads have the similar properties to expandable polystyrene beads, and thereby can be foam-molded by equipment for foaming the expandable polystyrene beads, it is possible to produce foams with various sizes and various shapes.
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