Invention Grant
- Patent Title: Method of producing polyamide fine particles, and polyamide fine particles
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Application No.: US17288959Application Date: 2019-10-24
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Publication No.: US11685813B2Publication Date: 2023-06-27
- Inventor: Itaru Asano , Tomohiko Nakamura , Yota Okuno , Nobuhiro Morioka
- 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 18211097 2018.11.09
- International Application: PCT/JP2019/041713 2019.10.24
- International Announcement: WO2020/095702A 2020.05.14
- Date entered country: 2021-04-27
- Main IPC: C08J3/14
- IPC: C08J3/14 ; C08G69/08

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.
Public/Granted literature
- US20210403651A1 METHOD OF PRODUCING POLYAMIDE FINE PARTICLES, AND POLYAMIDE FINE PARTICLES Public/Granted day:2021-12-30
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