| abstract |
The present invention provides heat-expandable microspheres, and the heat-expandable microspheres each contains a thermoplastic resin shell and a nuclear material encapsulated in the shell. The nuclear material contains a first foaming agent whose boiling point is not higher than the softening point of the thermoplastic resin and a second foaming agent whose boiling point is not higher than the softening point of the thermoplastic resin, and the second foaming agent is an alcohol compound different from the first foaming agent. The heat-expandable microspheres have an excellent foaming performance, and particularly a high foaming ratio. The present invention also provides a preparation method thereof and hollow microspheres, a composition and a molding product prepared from the heat-expandable microspheres. |