| 摘要 |
PROBLEM TO BE SOLVED: To provide thermally foaming micro-spheres suitable for processes in which a strong sharing force is applied, such as a kneading process, a calendaring process, an extrusion process, an injection molding, etc. SOLUTION: The thermally foaming micro-spheres having a structure of sealing a blowing agent in an outer shell formed from a polymer are provided by forming the outer sheel formed from the polymer with the polymer obtained by polymerizing a polymerizable monomer with a cross-linkable monomer in a ratio of >=1 wt.% and <=5 wt.% based on the above polymerizable monomer, and exhibiting >=5 fold maximum blowing rate. The method for producing the same spheres is also provided. |
