METHOD FOR CONCENTRATING AQUEOUS FLUOROPOLYMER DISPERSION

Title:

METHOD FOR CONCENTRATING AQUEOUS FLUOROPOLYMER DISPERSION

Document Type and Number:

WIPO Patent Application WO/1998/036017

Kind Code:

A1

Abstract:

A method for concentrating an aqueous dispersion of a fluoropolymer including one which is capable of easily forming fibers, such as PTFE, with a low energy consumption at a low cost in a short time merely by using a small amount of a surfactant selected from among various kinds thereof. An aqueous fluoropolymer dispersion containing 2.0 to 8.0 % by weight, based on the solid content of the fluoropolymer, of a surfactant is fed to a microfiltration film having a pore size of 0.01 to 1 $g(m)m through feeding means substantially free from shearing force to remove the aqueous medium containing the surfactant from the aqueous dispersion.

Inventors:

YAMASHITA MASANORI (JP)
MIURA TOSHIRO (JP)
MURAKAMI SHINJI (JP)
KAWACHI SHOJI (JP)
HAYASHI TADAO (JP)
HOSOKAWA KAZUTAKA (JP)

Application Number:

PCT/JP1998/000452

Publication Date:

August 20, 1998

Filing Date:

February 04, 1998

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
YAMASHITA MASANORI (JP)
MIURA TOSHIRO (JP)
MURAKAMI SHINJI (JP)
KAWACHI SHOJI (JP)
HAYASHI TADAO (JP)
HOSOKAWA KAZUTAKA (JP)

International Classes:

C08F6/20; (IPC1-7): C08J3/02; C08F14/18; C08F6/20

Foreign References:

JPH0234971B2	1990-08-07
JPS52147648A	1977-12-08
JPS4837575B1	1973-11-12

Other References: