09-05-2013 дата публикации
Номер: US20130116352A1
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 Cto Caliphatic hydrocarbon, Cto Chalogenated 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. 1. Expandable starch beads , comprising a starch-monomer copolymer and a foaming agent impregnated in the starch-monomer copolymer ,the starch-monomer copolymer being 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{'sub': 2', '7', '2', '7, 'the foaming agent including at least one selected from the group consisting of Cto Caliphatic hydrocarbon, Cto Chalogenated hydrocarbon, and carbon dioxide.'}2. The expandable starch beads according to claim 1 , wherein a weight ratio of starch to a monomer constituting the starch-monomer copolymer is 10:90 to 90:10.3. The expandable starch beads according to claim 1 , wherein the expandable starch beads include 90 parts to 99 parts by weight of the starch-monomer copolymer and 1 part to 10 parts by weight of the foaming agent.4. The expandable starch beads according to claim 1 , wherein the expandable starch beads further include 0.1 parts to 10 parts by weight of an initiator and 0.1 parts to 10 parts ...
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