Patent ID: 6841581
Filing Date: 2005-01-11
Classification: C08J,C09K

Abstract:
1. An extruded styrene resin foam obtained by extrusion-foaming of a styrene resin, the extruded styrene resin foam containing at least, one or more of saturated hydrocarbons having 3 to 5 carbon atoms as a blowing agent, and containing (A) a halogenated flame retardant, and (B) at least one compound selected from the group consisting of phosphorus type flame retardants containing nitrogen atom in a molecule; tetrazole compounds; nitrogen-containing compounds selected from cyanuric acid, isocyanuric acid, and derivatives thereof; metal borates; boron oxides; and phosphoric acid ester compounds, the extruded styrene resin foam having a cell structure constituting the foam wherein a cell anisotropic ratio k, which is defined by the formula: wherein, in sections of the foam, a (mm) is an average cell size in the thickness direction, b (mm) is an average cell size in the transverse direction and c (mm) is an average cell size in the longitudinal direction, satisfies the relationship: and a satisfies the relationship: