Porous poly(vinyl acetal) resin body having a high degree of cleanliness, a process of preparing the same, and a method of storing the same

摘要

A process of preparing and a method of storing porous poly (vinyl acetal) resin body. A method of storing the porous body involves keeping the porous body wet and free of contamination with organic substances, dissolved ions, and other fine particles. The storing method also involves keeping the body free of mold and avoiding pre-cleaning after a prolonged period of storage.