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:
Nov. 28, 2023
Filed:
Mar. 30, 2010
Makoto Ono, Settsu, JP;
Hiroyuki Sato, Settsu, JP;
Chie Sawauchi, Settsu, JP;
Taketo Kato, Settsu, JP;
Makoto Ono, Settsu, JP;
Hiroyuki Sato, Settsu, JP;
Chie Sawauchi, Settsu, JP;
Taketo Kato, Settsu, JP;
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Abstract
It is an object of the present invention to provide polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a high water-soluble surfactant with high volatility. Polytetrafluoroethylene has non-melt-secondary-processability, standard specific gravity of 2.160 or less, an average primary particle size of 150 nm or more, stress relaxation time of 500 seconds or more, and break strength of 29.7 N or more. The polytetrafluoroethylene is obtainable by emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant with Log POW of 3.4 or less.