Preparation of polyamide microcapsules having narrow size distributions.

A novel emulsification technique which employs microporous glass membranes was adopted to prepare polyamide microcapsules of narrow size distribution. This technique proved to be simple and quite efficient for getting fairly uniform sizes of dispersed liquid droplets. Polyamide microcapsules prepared by using this technique were found not completely monodisperse, but far more satisfactory than those by any conventional mechanical methods in view of their narrow size distribution. This method also seems promising to get various sizes of the capsules by selecting the pore size of the glass membranes.