| 摘要 |
PROBLEM TO BE SOLVED: To provide a foam which comprises a thermoreversibly crosslinkable resin and has a fine cell diameter thereby exhibiting improved dynamic properties, looking ultra-white and presenting a good appearance, and furthermore is excellent in recyclability, and to provide a method for preparing the same. SOLUTION: This foam comprises a thermoreversibly crosslinkable resin which flows at a flow beginning temperature Tc( deg.C) or above and has a crosslinked structure at Tc-40( deg.C) or below, and has an average cell diameter of at least 0.1μm and not more than 30μm and a void content of at least 20% and not more than 99%. The foam can be prepared by injecting a blowing agent soluble in a thermoreversibly crosslinkable resin into the resin at a temperature where the melt index (MI) of the resin is at least 1.5, cooling the resin down to a temperature where the MI of the resin is not more than 1.0 and allowing it to expand at a discharge opening.
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