| 摘要 |
<p>Disclosed is a porous powder of a crosslinkable polyvinyl acetal which is capable of forming a cured product having excellent solvent resistance by light irradiation, electron beam irradiation or heat treatment, while being excellent in cleanability and solubility in solvents. Specifically disclosed is a crosslinkable polyvinyl acetal porous powder which contains a crosslinkable polyvinyl acetal containing a monomer unit to which a crosslinkable functional group is bonded through at least one bond selected from an ester bond, an ether bond and a urethane bond, wherein the crosslinkable functional group content is 0.3-20% by mole relative to the total of-CH-CH-units in the main chain of vinyl acetal. The crosslinkable polyvinyl acetal porous powder has an average particle diameter of 30-10,000μm and a bulk density of 0.12-0.50 g/mL.</p> |
