	US 12,305,032 B2
	Resin powder and method for producing same
Shinsuke Nii, Kurashiki (JP)
Assigned to KURARAY CO., LTD., Kurashiki (JP)
Appl. No. 17/630,823
Filed by KURARAY CO., LTD., Kurashiki (JP)
PCT Filed Jul. 27, 2020, PCT No. PCT/JP2020/028614 § 371(c)(1), (2) Date Jan. 27, 2022, PCT Pub. No. WO2021/020323, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-140281 (JP), filed on Jul. 30, 2019.
Prior Publication US 2022/0275191 A1, Sep. 1, 2022
Int. Cl. C08L 29/04 (2006.01); B29B 9/02 (2006.01); B29B 9/12 (2006.01); B29B 9/16 (2006.01); C08F 8/12 (2006.01); C08F 216/06 (2006.01); C08J 3/12 (2006.01)

CPC C08L 29/04 (2013.01) [B29B 9/12 (2013.01); B29B 9/16 (2013.01); C08J 3/12 (2013.01); C08J 3/124 (2013.01); B29B 9/02 (2013.01); B29B 2009/125 (2013.01); B29B 2009/166 (2013.01); C08F 8/12 (2013.01); C08F 216/06 (2013.01); C08J 2329/04 (2013.01)]

20 Claims

1. 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=(Σ_i=1^Nr_i)/NR (1),

wherein, in the formula (1),

r_iis 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.