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This invention provides a thermoplastic polymer foam having a density of up to 800 kg/m.sup.3. The foam is made from a hydrogenated vinyl aromatic polymer that contains pendant cycloaliphatic groups. This polymer is conveniently made by hydrogenating a poly(vinyl aromatic) polymer such as polystyren

This invention provides a thermoplastic polymer foam having a density of up to 800 kg/m.sup.3. The foam is made from a hydrogenated vinyl aromatic polymer that contains pendant cycloaliphatic groups. This polymer is conveniently made by hydrogenating a poly(vinyl aromatic) polymer such as polystyrene or a polystyrene-butadiene block copolymer. A suitable blowing agent is a mixture comprising (a) one or more fluorine-containing carbon compounds and (b) carbon dioxide, nitrogen, an alcohol having from 1 to 4 carbon atoms, a linear or cyclic hydrocarbon having from 1 to 6 carbon atoms, a ketone, an alkyl ether, an alkyl halide, water or a mixture thereof.

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[ What is claimed is:] [1.]1. A foam produced from a composition comprising:a hydrogenated vinyl aromatic polymer, produced by hydrogenating a polymer comprising polymerized vinyl aromatic monomer, having an aromatic hydrogenation level of at least 70 weight percent, said foam having a thickness of

[ What is claimed is:] [1.]1. A foam produced from a composition comprising:a hydrogenated vinyl aromatic polymer, produced by hydrogenating a polymer comprising polymerized vinyl aromatic monomer, having an aromatic hydrogenation level of at least 70 weight percent, said foam having a thickness of at least 1 mm and a density of from 3 to 800 kg/m.sup.3 ;with the proviso that the foam is a bead stock foam, only if the hydrogenated vinyl aromatic polymer is a copolymer of a hydrogenated vinyl aromatic monomer and a hydrogenated conjugated diene monomer.