Vinylidene fluoride based polymer powder and vinylidene fluoride-based polymer solution

Vinylidene fluoride polymer powder is excellent in solubility in aprotic polar solvents and aims to provide a the powder, the aprotic polar vinylidene fluoride polymer solution obtained from the solvent. Vinylidene fluoride polymer powder of the present invention, in NMP permeability test, NMP permeability is 12 to 100%. NMP permeability test: cotton wool is packed inside diameter glass tube of 8mm in the lower, forming a lower sea sand layer, a vinylidene fluoride-based on the layer surface polymer powder 1g packed with vinylidene fluoride polymer the powder layer is formed, to form the upper sea sand on the layer surface. Then, on the surface of the upper sea sand layer, injected NMP5mL stained with methylene blue, injected from at after three minutes, penetration depth into the vinylidene fluoride polymer powder layer of NMP and vinylidene fluoride-based polymer measuring the thickness of the powder layer, the penetration depth to a value obtained by multiplying 100 to a value obtained by dividing the thickness of the vinylidene fluoride polymer powder layer and NMP permeability.