CROSSLINKABLE POLYVINYL ACETAL POROUS POWDER, METHOD FOR PRODUCING THE SAME, AND USE OF THE SAME

摘要

The present invention provides a crosslinkable polyvinyl acetal porous powder that has excellent washability and solvent solubility, and that can form a cured product with excellent solvent resistance by being subjected to photoirradiation, electron beam irradiation, thermal treatment or the like. The crosslinkable polyvinyl acetal porous powder of the present invention includes crosslinkable polyvinyl acetal containing a monomer unit having a crosslinkable functional group bonded thereto through at least one bond selected from the group consisting of an ester bond, an ether bond and an urethane bond, and having a content of the crosslinkable functional group of 0.3 to 20 mol% with respect to the total of -CH 2 -CH- units in the main chain of polyvinyl acetal. The crosslinkable polyvinyl acetal porous powder has an average particle size of 30 to 10000 µm and a bulk density of 0.12 to 0.50 g/mL.