Title:
PREVENTION OF SCUM DEVELOPMENT FROM AQUEOUS DISPERSION OF FLUOROPOLYMER
Document Type and Number:
Japanese Patent JP3648852
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively prevent scum development over a long period in the subject aqueous dispersion useful for e.g. coating of a base material with a small amount of a complex salt-forming agent, by adding a complex salt-forming agent to an aqueous dispersion of fluoropolymer under acidic conditions followed by making the system alkaline.
SOLUTION: (B) A complex salt-forming agent such as an aromatic or aliphatic carboxylic acid (salt) or an acid of an alkylenediamine (salt) is added to (A) an aqueous dispersion of fluoropolymer comprising a fluoropolymer such as (modified) polytetrafluoroethylene or tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, a nonionic surfactant and water under acidic conditions (pref. at ≤pH5) followed by making the component A alkaline. It is preferable that the amount of the component B to be used is at least equimolar to the iron, chromium contained in the component A.
Inventors:
Ryosuke Sota
Morimoto Nagashige
Market Shigeru
Morimoto Nagashige
Market Shigeru
Application Number:
JP16911396A
Publication Date:
May 18, 2005
Filing Date:
June 28, 1996
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
C08K5/092; C08J3/03; C08J3/075; C08K5/04; C08K5/09; C08K5/098; C08K5/16; C08K5/17; C08L27/12; C08L71/00; C08L71/02; (IPC1-7): C08L27/12; C08J3/03; C08J3/075; C08K5/09; C08K5/16; C08L71/02
Domestic Patent References:
| JP52046980B1 |
Attorney, Agent or Firm:
Aoyama Aoi
Yasuo Shibata
Yasuo Shibata