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AssigneeToray Industries, Inc.
InventorsItaru Asano, Tomohiko Nakamura, Yota Okuno, Nobuhiro Morioka
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A method produces polyamide fine particles by polymerizing a polyamide monomer (A) in the presence of a polymer (B) at a temperature equal to or higher than the crystallization temperature of a polyamide to be obtained, wherein the polyamide monomer (A) and the polymer (B) are homogeneously dissolved at the start of polymerization, and polyamide fine particles are precipitated after the polymerization. Polyamide fine particles have a number average particle size of 0.1 to 100 μm, a sphericity of 90 or more, a particle size distribution index of 3.0 or less, a linseed oil absorption of 100 mL/100 g or less, and a crystallization temperature of 150° C. or more.
Polyamide fine particles, wherein polyamide constituting the polyamide fine particles is polyamide 4 or polyamide 3, the polyamide fine particles have a number average particle size of 0.1 to 300 μm, a particle size distribution index of 1.00 to 1.45, a sphericity of 90 or more, and a linseed oil absorption of 100 mL/100 g or less.
Dependencies are inferred from the claim text.