| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a thermally expansible microcapsule small in particle size capable of enhancing the appearance of a foamed molded object with good productivity.SOLUTION: A method for manufacturing a thermally expansible microcapsule includes a step of preparing an aqueous dispersing medium containing a colloidal silica aggregate by adding a colloidal silica dispersion to an aqueous inorganic salt solution, a step of preparing an emulsion by suspending an oily substance containing a polymerizable monomer, a volatile liquid and a polymerization initiator in the aqueous dispersing medium, and a step of polymerizing the polymerizable monomer. In the step of preparing the aqueous dispersing medium, the content of colloidal silica in the colloidal silica dispersion is 3-15 wt.% and the colloidal silica dispersion is added so that the turbidity of the aqueous dispersing medium becomes 4-14°. |
