Invention Grant
- Patent Title: Method of producing polyamide fine particles, and polyamide fine particles
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Application No.: US17955169Application Date: 2022-09-28
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Publication No.: US11807717B2Publication Date: 2023-11-07
- Inventor: Itaru Asano
- Applicant: Toray Industries, Inc.
- Applicant Address: JP Tokyo
- Assignee: Toray Industries, Inc.
- Current Assignee: Toray Industries, Inc.
- Current Assignee Address: JP Tokyo
- Agency: DLA Piper LLP (US)
- Priority: JP 17095286 2017.05.12 JP 18014437 2018.01.31
- The original application number of the division: US16606837
- Main IPC: C08G69/26
- IPC: C08G69/26 ; C08G69/16 ; C08G69/46 ; C08G69/08 ; C08J3/12

Abstract:
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. In particular, a polyamide having a high crystallization temperature includes fine particles having a smooth surface, a narrow particle size distribution, and high sphericity.
Public/Granted literature
- US20230034929A1 METHOD OF PRODUCING POLYAMIDE FINE PARTICLES, AND POLYAMIDE FINE PARTICLES Public/Granted day:2023-02-02
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