METHOD OF STABILIZING FLUOROPOLYMER

Title:

METHOD OF STABILIZING FLUOROPOLYMER

Document Type and Number:

WIPO Patent Application WO/2000/026260

Kind Code:

A1

Abstract:

A method by which unstable groups of a melt-processable fluoropolymer can be stabilized rapidly and efficiently. The resultant stabilized polymer through melt molding gives a molded article free from not only air inclusions or voids but also discoloration. The method is characterized by melt-kneading a melt-processable fluoropolymer having unstable groups in a kneader having a stabilization zone satisfying the following requirements: (1) an oxygen-containing gas is present in the stabilization zone and (2) water is present in that zone. Preferably, (3) the absolute pressure in the zone is regulated to 0.2 MPa or higher; or (a) an oxygen-containing gas is present in the zone in an amount sufficient to enable the stabilized fluoropolymer to have a carbon radical spin number of 5x10?13¿ spins/g or smaller as determined by electron spin resonance (ESR) spectroscopy at a temperature of 77 K and (b) water is present in that zone.

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Inventors:

HIRAGA YOSHIYUKI (JP)
KOMATSU SATOSHI (JP)
NODA TOMOHISA (JP)
UTSUMI YASUHIRO (JP)

Application Number:

PCT/JP1999/006065

Publication Date:

May 11, 2000

Filing Date:

November 01, 1999

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
HIRAGA YOSHIYUKI (JP)
KOMATSU SATOSHI (JP)
NODA TOMOHISA (JP)
UTSUMI YASUHIRO (JP)

International Classes:

C08F6/00; C08F8/00; C08F14/00; C08J3/00; (IPC1-7): C08F6/00; C08J3/00; C08F14/18

Domestic Patent References:

WO1998009784A1

1998-03-12

Foreign References:

EP0469759A1	1992-02-05
EP0150953A2	1985-08-07
JPS6169805A	1986-04-10

Other References: