Patent · US Active

Method for producing purified polytetrafluoroethylene aqueous dispersion liquid, method for producing modified polytetrafluoroethylene powder, method for producing polytetrafluoroethylene molded body, and composition

US11851519B2 · kind B2 · utility

0Cited by

4References

4Claims

0Family size

Assignee

DAIKIN INDUSTRIES, LTD. · JP

Inventors

Takahiro Taira · Osaka, JP
Kazuhiro Mishima · Osaka, JP
Chiaki OKUI · Osaka, JP
Tadao Hayashi · Tokushima, JP
Hirotoshi Yoshida · Settsu, JP
Yuuji Tanaka · Osaka, JP
Masayoshi Miyamoto · Yokohama, JP
Taku Yamanaka · Osaka, JP
Taketo Kato · Osaka, JP

Key dates

Filing date	Aug 10, 2018
Grant date	Dec 26, 2023
Priority date	—
Expiry date	Oct 26, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2205/025
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant: (H—(CF2)m—COO)pM1; or Formula (1):(H—(CF2)n—SO3)qM2. Formula (2):Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition: (H—(CF2)8—SO3)qM2. Formula (3):

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.