| 摘要 |
Prepare a polymer foam by extrusion foaming a foamable thermoplastic polymer composition using a blowing agent containing 3 to 5 weight-percent (wt%) carbon dioxide, up to 5 wt% alcohol having 2-3 carbons, up to 0.7 wt% water and up to 2.5 weight-percent iso-butane; wherein the blowing agent comprises at least 0.1 wt% of water and/or alcohol having 2-3 carbons; two to five wt% infrared attenuating agent selected from petcokes and 100-700 nanometers size carbon black; 2.5 to 3.5 wt% brominated flame retardant; and at least 0.1 wt% of epoxy stabilizer wherein the resulting polymeric foam is characterized by having a density in a range of 30 to 37 kilograms per cubic meter, a unimodal cell size distribution, an average cell size of 0.15 to 0.4 millimeters, a thermal conductivity in a range of 28 to 35 milliwatts per meter*Kelvin and that passes the German B2 fire test.
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