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Aqueous tetrafluoroethylene polymer dispersion,process for producing the same, tetrafluoroethylene polymer powder,and molded tetrafluoroethylene polymer

a technology of tetrafluoroethylene and tetrafluoroethylene, which is applied in the field of aqueous tetrafluoroethylene tfe polymer dispersion, a method of producing the same, tfe polymer powder, and molded tetrafluoroethylene polymer, which can solve the problems of no description about an aqueous dispersion containing a polymer having a high tfe mono

Inactive Publication Date: 2007-03-15
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0161] The TFE polymer aqueous dispersion of the invention, which has the above-mentioned constitution, is stable at a high solid matter concentration and is generally excellent in moldability / processability and, therefore, it is useful as a raw material for producing a TFE polymer powder or a TFE polymer molding. The TFE polymer aqueous dispersion of the invention is very low in fluorine-containing surfactant content and is industrially useful since that fact facilitates the treatment of the liquid waste formed upon molding / processing thereof, among others.
[0162] The TFE polymer powder of the invention and the TFE polymer molding of the invention are obtained from the TFE polymer aqueous dispersion of the invention and, therefore, the TFE polymer powder of the invention is excellent in moldability / processability and the TFE polymer molding of the invention is excellent in mechanical characteristics and other physical properties.
[0163] The method of producing a TFE polymer aqueous dispersion according to the invention, which has the constitution described above, can give TFE polymer aqueous dispersions very low in fluorine-containing surfactant content and, therefore, is useful.BEST MODES FOR CARRYING OUT THE INVENTION
[0164] The following examples are further illustrative of the present invention. These examples are, however, by no means limitative of the scope of the invention.

Problems solved by technology

However, there is no description about an aqueous dispersion containing a polymer having a high TFE monomer unit content.
However, there is no description about an aqueous dispersion containing a polymer having a high TFE monomer unit content or about the fluorine-containing surfactant content in the aqueous VdF-based polymer dispersion obtained.

Method used

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  • Aqueous tetrafluoroethylene polymer dispersion,process for producing the same, tetrafluoroethylene polymer powder,and molded tetrafluoroethylene polymer
  • Aqueous tetrafluoroethylene polymer dispersion,process for producing the same, tetrafluoroethylene polymer powder,and molded tetrafluoroethylene polymer
  • Aqueous tetrafluoroethylene polymer dispersion,process for producing the same, tetrafluoroethylene polymer powder,and molded tetrafluoroethylene polymer

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of the TFE Polymer Aqueous Dispersion

[0165] A 3-liter stainless steel autoclave equipped with a stirring impeller was charged with 1.5 liters of deionized water, 60 g of paraffin wax (melting point 60° C.) and 700 mg of fluorovinyl group-containing compound 1 [CF2═CFOCF2CF(CF3)OCF2CF2CF2SO3Na], and the system inside was purged with TFE. The inside temperature was raised to 70° C., and the autoclave was charged with TFE under pressure until arrival of the inside pressure at 0.78 MPa and further charged with 5 g of a 0.6% (by mass) aqueous solution of ammonium persulfate [APS] to initiate the TFE polymerization reaction. Since otherwise the polymerization system inside pressure would lower with the progress of the polymerization, the reaction was continued while the inside pressure was maintained at 0.78 MPa by continuous additional feeding of TFE. At 6.5 hours after the start of the polymerization, the remaining TFE was purged off and the polymerization was discontinued....

examples 2 to 6

Preparation of TFE Polymer Aqueous Dispersions

[0169] TFE polymer aqueous dispersions were prepared in the same manner as in Example 1 except that the fluorovinyl group-containing compounds 2 to 6 specified below (hereinafter, Compounds 2 to 6) were respectively used in lieu of fluorovinyl group-containing compound 1. They were subjected to the measurements (1) to (5).

Compound 2: CF2═CFOCF2CF2CF2—COONa

Compound 3: CH2═CFCF2O—(CF(CF3) CF2O)2CF (CF3)—COONH4

Compound 4: CH2═CF—CF2OCF(CF3)—CF2OCF(CF3)—COONH4

Compound 5: CH2═CF—CF2OCF(CF3)—COONH4

Compound 6: CF2═CF—CF2CF2—COONH4

example 7

Preparation of a TFE Polymer Aqueous Dispersion

[0170] A TFE polymer aqueous dispersion was prepared in the same manner as in Example 4 except that 110 mg of Compound 4 was added prior to polymerization and five 110-mg portions thereof were further added at hourly intervals during the polymerization reaction. The dispersion was subjected to the measurements (1) to (5).

[0171] The measurement results in each example are shown in Table 1.

TABLE 1AmountAverageFluorine-ofprimarycontainingcompoundPolymerizationSolid matterparticlesurfactantusedtimeconcentrationdiameterconcentration(mg)(hours)(mass %)(nm)AI valueSSG(ppm)Example 17006.519.22060.0812.20546Example 24707.014.41750.1432.23228Example 39083.713.31820.0682.21825Example 46603.111.81800.0742.23818Example 54103.010.51760.0822.24219Example 62901.55.22810.1212.22529Example 76605.725.62000.0792.2227

[0172] As shown in Table 1, the TFE polymer aqueous dispersions obtained in Examples 1 to 7 were very low in fluorine-containing surfactan...

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Abstract

The present invention provides a tetrafluoroethylene polymer aqueous dispersion obtained by carrying out a TFE polymerization in an aqueous medium in the presence of a fluorovinyl group-containing emulsifier, wherein the TFE polymer aqueous dispersion contains a particle comprising a TFE polymer dispersed in the aqueous medium, the fluorovinyl group-containing emulsifier comprises a fluorovinyl group-containing compound, and the TFE polymer aqueous dispersion has a fluorine-containing surfactant content of not higher than 1000 ppm by mass.

Description

TECHNICAL FIELD [0001] This invention relates to an aqueous tetrafluoroethylene [TFE] polymer dispersion, a method of producing the same, a TFE polymer powder, and a TFE polymer molding. BACKGROUND ART [0002] Patent Document 1 (Japanese Patent Publication (Kokoku) S61-33848) describes a method for producing an aqueous dispersion containing vinylidene fluoride [VdF] / TFE / hexafluoropropylene-based fluorine-containing elastomer particles with a particle diameter of 0.02 μm as dispersed therein which comprises carrying out the polymerization reaction in the presence of a fluorine-based surfactant having a polymerizable double bond represented by the formula CF2═CFO(CF2)nCOOM (in which n is an integer of 1 to 7 and M is an amine or alkali metal). However, there is no description about an aqueous dispersion containing a polymer having a high TFE monomer unit content. [0003] Patent Document 2 (Japanese Kokai Publication H08-67795) describes a method for producing an aqueous dispersion conta...

Claims

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Application Information

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IPC IPC(8): C08L27/12C08F2/24C08F14/26C08F214/26
CPCC08F14/26C08F214/26C08F2/16
Inventor TSUDA, NOBUHIKONANBA, YOSHINORISAWADA, YASUHIKOSHIMIZU, TETSUO
Owner DAIKIN IND LTD
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