Patent ID: 8507589

Claim:
A method for generating an open-cell flame retardant thermoplastic foam from a stabilized aqueous dispersion, the aqueous dispersion comprising a thermoplastic resin, water, and a dispersion-stabilizing agent, the method comprising: adding at least one frothing surfactant to the stabilized aqueous dispersion to form a mixture; adding a flame retardant; frothing the mixture to create a froth; and removing at least a portion of the water to produce the open-cell foam; wherein the thermoplastic resin comprises an ethylene homopolymer, an ethylene/α-olefin copolymer, or an ethylene/α-olefin multiblock interpolymer, a propylene homopolymer, a propylene/α-olefin copolymer, a propylene/α-olefin multiblock interpolymer, or a combination of two or more thereof.