Phenolic foam
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsYuichi Arito, Kenji Takasa
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Abstract
A phenolic foam having a density of from 10 kg/m3 to 100 kg/m3 and comprising a phenolic resin base part and a cellular part most of which is made up of a large number of fine cells, wherein the fine cells contain a hydrocarbon and have an average cell diameter of 5 μm to 200 μm, and the cell walls of at least most of the fine cells are formed of a smooth surface of the phenolic resin base. While the blowing agent is a hydrocarbon, the foam has a thermal conductivity comparable to that of a conventional foam made with a flon blowing agent, undergoes no change in thermal conductivity with time, exhibits excellent mechanical strength such as compressive strength, and has reduced brittleness.
Claims15
A phenolic foam having a density of 10 kg/m3 to 100 kg/m3 and containing a hydrocarbon, which is characterized by having an average cell diameter in a range of from 5 μm to 200 μm, a void area ratio of 5% or less in its cross section, and substantially no holes in the cell walls.
Dependencies are inferred from the claim text.