| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally expandable microcapsule of relatively small size, with such high heat resistance as to undergo neither burst nor contraction at high temperatures, that is, smaller than 25μm in size prior to expansion and 180°C or higher in the maximum expansion temperature. SOLUTION: The thermally expandable microcapsule is such that a volatile expanding agent is included as the core agent in a shell formed by polymerizing a monomer blend comprising a nitrile-based monomer and methacrylic acid as polymerizable monomer components, wherein the methacrylic acid accounts for≥10 wt.% of the monomer components. The volume-average size of this microcapsule is smaller than 25μm. COPYRIGHT: (C)2005,JPO&NCIPI
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