FLUORINE-CONTAINING POLYMER AQUEOUS DISPERSION

• US 20130079466A1
• Filed: 05/13/2011
• Published: 03/28/2013
• Est. Priority Date: 05/25/2010
• Status: Active Grant

• Current Assignee: Unimatec Co., Ltd. (NOK Corporation)
• Original Assignee: Unimatec Co., Ltd. (NOK Corporation)
• Inventors: Kaneumi, Yoshiyama, Murai, Daisuke
• Granted Patent: US 9,068,059 B2
• Time in Patent Office: Days
• US Class Current: 524/712
• CPC Class Codes: C08F 14/22 Vinylidene fluoride
• CPC Class Codes: C08F 2/26 anionic
• CPC Class Codes: C08F 2/30 non-ionic
• CPC Class Codes: C08F 214/22 Vinylidene fluoride
• CPC Class Codes: C08F 214/26 Tetrafluoroethene
• CPC Class Codes: C08F 214/28 Hexyfluoropropene
• CPC Class Codes: C08K 5/5317 Phosphonic compounds, e.g. R—P(:O)(OR')2

Abstract

Disclosed is a fluorine-containing polymer aqueous dispersion in which a fluorine-containing polymer is dispersed using, as an emulsifier, a polyfluoroalkylphosphonic acid salt represented by the general formula:

C_nF_2n+1(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cP(O)(OM¹)(OM²)  [I],

wherein M¹ is a hydrogen atom, an alkali metal, an ammonium base, or an organic amine base, M² is an alkali metal, an ammonium base, or an organic amine base, n is an integer of 1 to 6, a is an integer of 1 to 4, b is an integer of 1 to 3, and c is an integer of 1 to 3. This fluorine-containing polymer aqueous dispersion uses a polyfluoroalkylphosphonic acid salt with a low bioaccumulation potential as an emulsifier, and has excellent mechanical stability.

Claims

1. A fluorine-containing polymer aqueous dispersion in which a fluorine-containing polymer is dispersed using, as an emulsifier, a polyfluoroalkylphosphonic acid salt represented by the general formula:

C_nF_2n+1(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cP(O)(OM¹)(OM²) 

 

[I]

wherein M¹ is a hydrogen atom, an alkali metal, an ammonium base, or an organic amine base, M² is an alkali metal, an ammonium base, or an organic amine base, n is an integer of 1 to 6, a is an integer of 1 to 4, b is an integer of 1 to 3, and c is an integer of 1 to 3.

2. The fluorine-containing polymer aqueous dispersion according to claim 1, wherein the polyfluoroalkylphosphonic acid salt is used as an ammonium salt.

3. The fluorine-containing polymer aqueous dispersion according to claim 1, which is obtained by emulsion polymerization of the fluorine-containing monomer in the presence of an aqueous solution of the polyfluoroalkylphosphonic acid salt emulsifier represented by the general formula [I].

4. A method for producing a fluorine-containing polymer, the method comprising subjecting a product obtained by coagulating the fluorine-containing polymer aqueous dispersion according to claim 3 to filtration, water washing and drying.

5. The method for producing a fluorine-containing polymer according to claim 4, wherein the coagulation is carried out by by salting-out.

6. (canceled)