| PATENT CLAIMS |
What is claimed is:
1. An extruded styrene resin foam containing no flon type blowing agent and having both thermal insulating property and flame retardant property meeting thermal insulating board No. 3 of extruded polystyrene foam prescribed in JIS A 9511.
2. The extruded styrene resin foam of claim 1, wherein the thermal insulating property is 0.028 W/mK or lower in terms of thermal conductivity.
3. The extruded styrene resin foam of claim 1 or 2, wherein the flame retardant property meets the requirements that the flame is extinguished within 3 seconds and neither remaining ember nor spreading flame beyond the indicating line of combustion limit exists in the combustion test prescribed in JIS A 9511.
4. An extruded styrene resin foam containing no flon type blowing agent and having both thermal insulating property and flame retardant property meeting thermal insulating board No. 3 of extruded polystyrene foam prescribed in JIS A 9511, wherein said resin foam contains a blowing agent comprising 100 to 10% by weight of at least one saturated hydrocarbon having 3 to 5 carbon atoms and 0 to 90% by weight of other blowing agent, based on the total amount of the blowing agent.
5. The extruded styrene resin foam of claim 4, wherein the blowing agent comprises 100 to 30% by weight of at least one saturated hydrocarbon having 3 to 5 carbon atoms and 0 to 70% by weight of at least one ether selected from the group consisting of dimethyl ether, diethyl ether, and methyl ethyl ether, based on the total amount of the blowing agent.
6. An extruded styrene resin foam containing no flon type blowing agent and having both thermal insulating property and flame retardant property meeting thermal insulating board No. 3 of extruded polystyrene foam prescribed in JIS A 9511, wherein the blowing agent comprises at least one saturated hydrocarbon having 3 to 5 carbon atoms; at least one ether selected from the group consisting of dimethyl ether, diethyl ether, and methyl ethyl ether; and water, and further contains a montmorillonite type material.
7. The extruded styrene resin foam of claim 6, wherein the montmorillonite type mineral is bentonite.
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