IP Library › Granted Patent US 11,518,826
Granted Patent B2
US 11,518,826 · App. 16/957,288 · Granted Dec 6, 2022

Method for producing polytetrafluoroethylene powder

Inventors: Kazuhiro Mishima (Osaka, JP); Takahiro Taira (Osaka, JP); Chiaki Okui (Osaka, JP); Takayuki Tanaka (Osaka, JP); Masayoshi Miyamoto (Osaka, JP); Taku Yamanaka (Osaka, JP)
Assignee: DAIKIN INDUSTRIES, LTD.
C08F14/26C08J3/16C08J3/28C08J2327/18
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Quick Facts
Patent No.
US 11,518,826
App. No.
16/957,288
Granted
Dec 6, 2022
Kind
B2
Abstract

A method for producing a polytetrafluoroethylene powder, which includes applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing polytetrafluoroethylene particles to coagulate the polytetrafluoroethylene particles.

Claims (5)

1. A method for producing a polytetrafluoroethylene powder, comprising:

applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing a polytetrafluoroethylene particle and an anionic hydrocarbon surfactant to coagulate the polytetrafluoroethylene particle,

wherein the application of the ultrasonic wave is performed with an output of 100 W or more and at a frequency of 15 kHz or more.

2. The production method according to claim 1 ,

wherein the polytetrafluoroethylene aqueous dispersion is obtained by polymerizing tetrafluoroethylene in an aqueous medium in the presence of the anionic hydrocarbon surfactant.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 23, 2020
From: MISHIMA, KAZUHIRO; TAIRA, TAKAHIRO; OKUI, CHIAKI; TANAKA, TAKAYUKI; MIYAMOTO, MASAYOSHI; YAMANAKA, TAKU
To: DAIKIN INDUSTRIES, LTD.
Reel/Frame 053016/0122 →
Priority Claims (1)
JP JP2017-248551 · Dec 25, 2017 · national
Continuity (1)
Related Publication 20210388126A1 · Dec 16, 2021
Cited By (1)
US 12,404,387