US 12,655,315 B2 · Polytetrafluoroethylene aqueous dispersion

Abstract

A PTFE aqueous dispersion having low viscosity at high temperature. The PTFE aqueous dispersion contains PTFE and a nonionic surfactant, has a PTFE solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 50 mPa·s or lower. Also disclosed is a method for producing the PTFE aqueous dispersion, a coating film obtained by applying the PTFE aqueous dispersion, an impregnated film obtained by impregnating the PTFE aqueous dispersion, and a coated article containing a coating film obtained by applying the PTFE aqueous dispersion.

Claims19

Dependent claims

A polytetrafluoroethylene aqueous dispersion comprising polytetrafluoroethylene and a nonionic surfactant,

the aqueous dispersion having a polytetrafluoroethylene solid concentration of 50 to 70% by mass,
the aqueous dispersion being substantially free from a fluorine-containing surfactant, and
the aqueous dispersion having a viscosity at 55° C. of 50 mPa·s or lower,
wherein the nonionic surfactant includes oxyalkylene units, and an average number of oxyalkylene units in the nonionic surfactant is 10.2 or more.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/687,086Filed 4 Mar 2022 · continuation

Priority

JP 2019-1623215 Sep 2019

Published

US 2022/0275237 A11 Sep 2022

Granted

16 Jun 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

C08L 27/18
Containing fluorine atoms: homopolymers or copolymers or tetrafluoroethene
C09D 127/18
Containing fluorine atoms: homopolymers or copolymers of tetrafluoroethene
C08F 2/22
Aqueous medium: emulsion polymerisation
C08F 6/22
Treatment of polymer emulsions: coagulation

Polytetrafluoroethylene aqueous dispersion

Life of this patent

Polytetrafluoroethylene aqueous dispersion

Life of this patent

Abstract

Claims19