| abstract |
PROBLEM TO BE SOLVED: To extrude styrene resin having excellent heat insulation performance, strength necessary for building materials, flame retardancy, etc. by effectively using water as a non-halogen-based foaming agent excellent in environmental compatibility A method for producing a foam is provided. SOLUTION: A) 100 parts by weight of styrenic resin, B) foaming agent containing at least 0.3 to 4 parts by weight of water, C) 0.1 to 50 parts by weight of smectite, D) 0.05 to 1 phosphate A styrene-based resin extruded foam comprising: |