Expanded articles of biodegradable plastics materials and a method for their production
AssigneeSpherilene S.r.l.
InventorsCatia Bastioli, Vittorio Bellotti, Luciano Del Giudice, Roberto Lombi, Angelos Rallis
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Abstract
Expanded articles of biodegradable plastics are produced by the extrusion of a composition including starch, a polymer compatible with starch, in particular, an ethylene-acrylic acid copolymer and/or ethylene-vinyl alcohol copolymer, and an expanding agent. Preferably use is made of sodium bicarbonate as expanding agent in the presence of a polymeric acid.
Claims17
Expanded articles of biodegradable plastics material comprising a material including starch and a synthetic polymer selected from the group consisting of ethylene-vinyl alcohol, ethylene-acrylic acid, and mixtures thereof, said articles having a closed pore structure and a density of from 0.1 to 0.3 g/cm.sup.3.
A method for the production of expanded articles of biodegradable plastics material, comprising the step of extruding a composition including starch and a synthetic polymer selected from the group consisting of ethylene-vinyl alcohol and ethylene-acrylic acid in the presence of a polymeric acid and sodium bicarbonate as the expanding agent.
Dependencies are inferred from the claim text.