Patent Number: 6,310,112

Title: Hydrogenated vinyl aromatic polymer foams

Abstract: 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.

Inventors: Vo; Chau Van (Souffelweyersheim, FR), Hahnfeld; Jerry L. (Midland, MI), Achille; Felix (Midland, MI), Imeokparia; Daniel D. (Midland, MI), Mackey; George A. (Midland, MI)

Assignee: The Dow Chemical Company

International Classification: C08J 9/00 (20060101); C08J 9/14 (20060101); C08J 9/16 (20060101); C08J 009/00 ()

Expiration Date: 10/30/2018