| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally expansible microcapsule excellent in storage stability, and capable of being suitably used for molding in which a strong shear force is applied, and to provide a method for manufacturing the thermally expansible microcapsule.SOLUTION: A thermally expansible microcapsule contains a gas-barrier polymer and a pyrolyzable solid polymer, wherein the weight loss rate after being heated at 100°C for 15 min is ≤1%, and the weight loss rate after being heated at 200°C for 15 min is ≥5%; the gas-barrier polymer is a polymer obtained by polymerizing at least one gas-barrier monomer selected from the group consisting of acrylonitrile, methacrylonitrile and vinylidene chloride; and the gas-barrier polymer is contained in ≥30 wt.%. |
