The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2025
Filed:
Apr. 16, 2020
Daikin Industries, Ltd., Osaka, JP;
Chiaki Okui, Osaka, JP;
Hirotoshi Yoshida, Osaka, JP;
Hiroyuki Sato, Osaka, JP;
Kenji Ichikawa, Osaka, JP;
Taketo Kato, Osaka, JP;
Taku Yamanaka, Osaka, JP;
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Abstract
A method for producing a fluoropolymer powder including (A1) adding, to a fluoropolymer aqueous dispersion obtained by polymerization using a carboxylic acid type hydrocarbon surfactant, and an acid to adjust a pH to 4.0 or less and cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following general formula (1A), and (B1) heat-treating the wet fluoropolymer powder at a temperature higher than 150° C. and lower than 240° C.: General Formula (1A): H—(CF)—COOH wherein m is 3 to 19.