| abstract |
[PROBLEMS] A heat that has excellent heat resistance, has a wide foaming temperature range, and has a high foaming ratio, and can be suitably used for kneading molding, calender molding, extrusion molding, injection molding, etc. to which a strong shear force is applied. An expandable microcapsule and a foam molded article using the thermally expandable microcapsule are provided. A thermally expandable microcapsule in which a volatile expansion agent is encapsulated as a core agent in a polymer shell, having a foaming start temperature of 160 ° C. or lower, a maximum foaming temperature of 200 ° C. or higher, and The shell is composed of 40 to 94% by weight of at least one polymerizable monomer selected from acrylonitrile, methacrylonitrile and vinylidene chloride, and 5 to 50% by weight of a radically polymerizable unsaturated carboxylic acid monomer having 3 to 8 carbon atoms. % And a monomer mixture containing 1 to 30% by weight of an amide-based polymerizable monomer having a total of 4 or more carbon atoms of hydrocarbons bonded to amide nitrogen atoms. [Selection figure] None |