Extruded styrene resin foam and process for producing the same

Details Extruded styrene resin foam and process for producing the same Extruded styrene resin foam and process for producing the same

2005-01-11

2005-01-11

Foelak, Morton (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C264S053000, C521S081000

Reexamination Certificate

active

06841581

ABSTRACT:
An extruded styrene resin foam which is produced by using a blowing agent imposing a reduced load on the environment and has outstandingly excellent thermal insulating property and flame retardant property adapted for construction use. The foam is obtained by extrusion-foaming of a styrene resin and characterized by 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; specific nitrogen-containing compounds; metal borates; boron oxides; phosphoric acid ester compounds, and having a cell structure constituting the foam wherein a cell anisotropic ratio k, which is defined by the formula: k=a/(a×b×c)1/3wherein, 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: k≦1.1, and a satisfies the relationship: 0.05≦a≦0.30, and the method for producing the same.

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International Search Report Corresponding to International Application No. PCT/JP01/11248 From the Japanese Patent Office Dated Apr. 2, 2002.

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