Thermally expandable microcapsules, foamable resin composition, and foam

Abstract

The present invention provides a thermally expandable microcapsule that enables the production of a light molded article with high expansion ratio and excellent appearance, as well as a foamable resin composition and a foam that are produced using the thermally expandable microcapsule. Provided is a thermally expandable microcapsule including: a shell containing a polymer; and a volatile expansion agent as a core agent encapsulated by the shell, the shell containing silicon dioxide and a polymer obtained by polymerizing a monomer composition containing a carbonyl group-containing monomer, the thermally expandable microcapsule having a volatile content of 0.55% by weight or more and 2% by weight or less upon standing for one hour at a temperature of 70° C.

Dependencies are inferred from the claim text.