Resin powder and method for producing same
AssigneeKuraray Co., Ltd.
InventorShinsuke Nii
Life of this patent
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Abstract
A resin powder may be superior in passability through pipes and silos, and a method may produce such a resin powder. The resin powder contains a vinyl alcohol polymer, an average particle diameter thereof is 100 to 2,000 μm, and an average value PA of a roundness P by formula (1), of 50 particles arbitrarily extracted from the particles of the resin powder having a particle diameter of 100 to 1,000 μm, is 0.1 to 0.8. P=(Σi=1Nri)/NR (1) ri being a radius of curvature of each particle corner of the 50 particles; R being a maximum inscribed circle radius of the particle; and N being a number of particle corners. If the number of particle corners is 9 or more, the radii of curvature of eight corners, in increasing order from a smallest radius of curvature, are adopted, and N is 8.
Claims20
Particles, comprising:
- a resin powder comprising a vinyl alcohol polymer,
- wherein an average particle diameter of the particles is in a range of from 100 to 2,000 μm, and
- wherein an average value PA of a roundness P, by formula (1), of 50 particles arbitrarily selected from the particles, the 50 particles having particle diameters in a range of from 100 to 1,000 μm, is in a range of from 0.1 to 0.8:
- P=(Σi=1Nri)/NR (1),
- wherein, in the formula (1),
- ri is a curvature radius of each corner of an Nth particle of the 50 particles arbitrarily selected, corners being observed in a projection image of the 50 particles with a maximum apparent area observed at 100-fold enlargement on a digital microscope,
- R is a maximum inscribed circle radius of the Nth particle, and
- N is a number of the corners of the Nth particle,
- wherein, when a number of the corners of the Nth particle is 9 or more, radii of curvature of eight corners, in increasing order from a smallest radius of curvature, are adopted, and N is set to 8.
A plurality of particles, the particles comprising:
- a vinyl alcohol polymer,
- wherein an average particle diameter of the plurality of the particles is in a range of from 100 to 2,000 μm, and
- wherein an average value PA of a roundness P, by formula (1), of 50 particles arbitrarily extracted from the particles after passing through a 16 mesh sieve screen and retained by a 150 mesh sieve screen, is in a range of from 0.1 to 0.8:
- P=(Σi=1Nri)/NR (1),
- wherein, in the formula (1),
- ri is a curvature radius of each corner of an Nth particle of the 50 particles arbitrarily selected, corners being observed in a projection image of the 50 particles with a maximum apparent area observed at 100-fold enlargement on a digital microscope,
- R is a maximum inscribed circle radius of the Nth particle;
- and
- N is a number of the corners of the Nth particle,
- wherein, when a number of the corners of the Nth particle is 9 or more, radii of curvature of eight corners, in increasing order from a smallest radius of curvature, are adopted, and N is set to 8.
Dependencies are inferred from the claim text.