JP6165307B2 - Non-aqueous dispersion of fluororesin - Google Patents

Description

The present invention relates low viscosity particle diameter, the non-aqueous dispersion having excellent fluororesin storage stability.

  Fluorine resins such as polytetrafluoroethylene (PTFE) and fluorinated ethylene-propylene copolymer are materials having excellent heat resistance, electrical insulation, non-adhesiveness, weather resistance, etc. Tetrafluoroethylene (PTFE) is a material that excels in heat resistance, electrical insulation, low dielectric properties, low friction properties, non-adhesiveness, weather resistance, etc., and is used in electronic equipment, sliding materials, automobiles, kitchenware, etc. It's being used. Fluorocarbon resins such as polytetrafluoroethylene with such characteristics are added as micro powders to various resin materials (resist materials), rubber, adhesives, lubricants, greases, printing inks, paints, etc. It is used for the purpose of improving characteristics.

  For example, polytetrafluoroethylene micropowder is usually obtained by polymerizing tetrafluoroethylene (TFE) monomer in the presence of a stabilizer such as water, a polymerization initiator, a fluorine-containing emulsifier, and paraffin wax by an emulsion polymerization method. After being obtained as an aqueous dispersion containing polytetrafluoroethylene fine particles, it is produced through concentration, aggregation, drying and the like (see, for example, Patent Document 1).

As a method of adding the micro-powder of fluororesin such as polytetrafluoroethylene to the resin material, for example, in addition to the method of directly mixing, it is dispersed in water or an oily solvent and mixed as a dispersion such as PTFE. Methods are known. By adding after dispersing in water or an oily solvent, it can be mixed uniformly.
However, micro-powder of fluororesin such as polytetrafluoroethylene has strong cohesion between particles, especially dispersed in a non-aqueous solvent such as oily solvent with a fine particle size, low viscosity and excellent storage stability. There was a problem that it was difficult to do.

Furthermore, when adding to a water-insoluble resin or resist material, an oil-based solvent-based polytetrafluoroethylene dispersion is required, and many inventions relating to an aqueous dispersion of polytetrafluoroethylene are known. (See, for example, Patent Documents 2 and 3), however, there are almost no reports regarding an oil-based solvent-based polytetrafluoroethylene dispersion or the like compared to this aqueous dispersion (see, for example, Patent Document 4). .
The technique described in Patent Document 4 comprises PTFE particles and at least one mono- or polyolefin-based unsaturated oil or oil mixture, and the molecules of the olefin-based unsaturated oil are radicals on the surface of PTFE (primary) particles. There is permanent charge separation between the oil molecules that are covalently / chemically bound by the reaction and then bound to the PTFE particle surface and fine dispersion of the PTFE particles in the oil or oil mixture. A long-term stable oil-PTFE dispersion, the process of which is modified PTFE (emulsion) polymer with persistent perfluoro (peroxy) radicals mixed with at least one olefinically unsaturated oil, And the modified PTFE (emulsion) polymer is obtained by a method in which it is subjected to mechanical stress, etc. A miscellaneous, also not those using PTFE particles generic, and non-aqueous dispersion of the fluorine-based resin of the present invention, the technical idea (structures and effects thereof) is one which differs at all.

  Conventionally, when dispersing micro-powder of fluorine-based resin such as polytetrafluoroethylene, a surfactant or dispersant containing fluorine such as alkyl fluoride has been used. This is because the surface of PTFE is very difficult to wet with water or oil-based solvent and the like, and the cohesive force between particles is strong. This is because it is very difficult.

  On the other hand, surfactants and dispersants containing such fluorine groups may be thermally decomposed at high temperatures to generate hydrogen fluoride, and there are concerns about adverse effects on the environment and safety. There is a need for a non-aqueous dispersion of a fluororesin that solves these problems.

JP 2012-92323 A (Claims, Examples, etc.) JP 2006-169448 A (Claims, Examples, etc.) JP 2009-179802 A (Claims, Examples, etc.) JP 2011-509321 A (Claims, Examples, etc.)

The present invention intends to solve the above-mentioned conventional problems and current situation, and the first object is to reduce the particle size without adding a surfactant or dispersant containing a fluorine group. low viscosity, is excellent in storage stability, Ru der to provide a non-aqueous dispersion having excellent fluororesin redispersibility even after long-term storage.

As a result of intensive studies on the above-mentioned conventional problems and the like, first, the present inventors include a fluororesin micropowder and a compound represented by a specific formula, so that found that the aqueous dispersion is obtained, it was led to the completion of the present onset Akira.

That is, the present onset Ming, at least, the specific surface area and 5-60 wt% of the micropowder of the following fluorine-based resin 15 m 2 / ^g, the micro-powder fluororesin a compound represented by the following formula (I) and 0.1 to 15% by weight, based on the weight, and a non-aqueous solvent seen containing an average particle size of the micro-powder fluoro resin in the nonaqueous dispersion (average particle diameter of cumulant method analysis in the scattered intensity distribution) A non-aqueous dispersion of a fluororesin characterized by being 1 μm or less .

According to the onset bright, even without adding a surfactant or dispersing agent comprising a fluorine group, a low viscosity in particulate size, it is excellent in storage stability, fluorine-based resin excellent in redispersibility even after long-term storage A non-aqueous dispersion of is provided.

In the following, the implementation embodiment of the present onset Akira For details will be explained.

[Non-aqueous dispersion of the full Tsu Motokei Resin
Non aqueous dispersion of the present onset Ming fluororesin is at least one that the micro-powder of a fluorine-based resin, a compound represented by the following formula (I), characterized in that it comprises a non-aqueous solvent .

<Micro powder of fluororesin>
Examples of fluororesin micropowder that can be used in the first invention include polytetrafluoroethylene (PTFE), fluoroethylene-propylene copolymer (FEP), perfluoroalkoxy polymer (PFA), chloro It consists of trifluoroethylene copolymer (CTFE), tetrafluoroethylene-chlorotrifluoroethylene copolymer (TFE / CTFE), ethylene-chlorotrifluoroethylene copolymer (ECTFE), and polychlorotrifluoroethylene (PCTFE). A micropowder of at least one fluororesin selected from the group can be mentioned.
Among the fluororesin micropowders, polytetrafluoroethylene (PTFE, relative dielectric constant 2.1) having the most excellent characteristics among resin materials, particularly as a material having a low relative dielectric constant and a low dielectric loss tangent. Use is desirable.
Such micropowder of fluororesin such as polytetrafluoroethylene is obtained by an emulsion polymerization method, for example, a method described in a fluororesin handbook (edited by Takaomi Satokawa, Nikkan Kogyo Shimbun), It can be obtained by a commonly used method. The fluororesin micropowder obtained by the emulsion polymerization is agglomerated and dried, and is recovered as a fine powder as secondary particles with a primary particle size aggregated. Various fine powder production methods can be used.

The primary particle size of the micro-powder fluororesin such as polytetrafluoroethylene micropowder used in the present onset Ming is not particularly limited, a laser diffraction scattering method, a dynamic light scattering method is measured by an image imaging method The volume-based average particle diameter (50% volume diameter, median diameter) is preferably 1 μm or less, and preferably 0.5 μm or less, more preferably 0, for more stable dispersion in a non-aqueous solvent. When the thickness is 3 μm or less, a more uniform dispersion is obtained.
When the primary particle diameter of the fluororesin micropowder exceeds 1 μm, it tends to settle in an oily solvent, making it difficult to stably disperse.
Further, the lower the lower limit of the average particle diameter, the better. However, from the viewpoint of manufacturability, cost, etc., it is preferably 0.05 μm or more.
The primary particle size of the fluororesin micropowder in the present invention is, for example, a value measured at the emulsion polymerization stage of a fluororesin micropowder such as polytetrafluoroethylene micropowder (laser diffraction / scattering method or dynamics). The value obtained by a dynamic light scattering method, etc.), but in the case of polytetrafluoroethylene micropowder that has been dried to a powder state, the cohesion between primary particles is strong, and primary Since it is difficult to measure the particle diameter by a laser diffraction / scattering method or a dynamic light scattering method, a value obtained by an image imaging method may be indicated. As a measuring apparatus, for example, a dynamic light scattering method using FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.), a laser diffraction / scattering method using Microtrack (manufactured by Nikkiso Co., Ltd.), or Mac View (manufactured by Mountec Co., Ltd.) Examples thereof include an image imaging method.

Micropowder of fluororesin such as polytetrafluoroethylene micropowder used in the present onset Ming preferably has a specific surface area less than or equal to 15 m 2 / ^g, more preferably, 2 to 15 m 2 / ^g, particularly preferably It is desirable that it is ^{2 to} 13 m ² / g, more preferably ² to 11 m ² / g. In the present invention (including examples described later), the “specific surface area” is a value obtained by the gas adsorption method using the BET equation.
When the specific surface area of the fluororesin micropowder such as PTFE is more than 15 m ² / g, it aggregates in a non-aqueous solvent, tends to settle, and is difficult to stably disperse.
Further, the value of the specific surface area of the micro-powder of the fluororesin is preferably as low as possible, but is preferably ² m ² / g or more from the viewpoint of manufacturability and cost.

  The micropowder of fluororesin such as polytetrafluoroethylene micropowder that can be specifically used is selected from those having a suitable specific surface area and primary particle diameter. For example, as PTFE having the above specific surface area, Dionon TF Micropowder TF-9201Z, Dinion TF Micropowder TF-9207Z (all manufactured by 3M), Nano FLON119N, FLUORO E (all manufactured by Shamrock), TLP10F- 1 (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.), KTL-500F (manufactured by Kitamura Co., Ltd.), Algolon L203F (manufactured by SOLVAY), and the like can be used.

Preferred forms of micropowder fluororesin such as polytetrafluoroethylene micropowder used in the present onset Ming, as described above, which the primary particle diameter is 1μm or less, or a specific surface area of less than or equal to 15 m 2 / ^g Although listed, each application used for non-aqueous dispersions of fluororesins (various resin materials, resist materials, rubber, adhesives, lubricants and greases, printing inks and paints, used for the production of circuit boards Circuit board adhesive composition, circuit board laminates using the same, applications such as cover lay films, prepregs, insulating layers of multilayer printed wiring boards for electronic devices), or the like, with a primary particle diameter of 1 μm or less, or can be used as the specific surface area is less than 15 m 2 / ^g, be those primary particle diameter is 1μm or less and a specific surface area of 15 m ² / Those may be used as equal to or less than.

In this onset bright, on the dispersion total amount, which micropowder of fluororesin such as polytetrafluoroethylene micropowder is contained 5 to 60 wt%, preferably it contained 10 to 50 wt% It is desirable.
When this content is less than 5% by mass, the amount of non-aqueous solvent is large, and the viscosity is extremely reduced, so that fine particles of micro-powder of fluororesin such as polytetrafluoroethylene can easily settle, When mixed with a material such as a resin, a problem due to a large amount of the non-aqueous solvent, for example, an unfavorable situation such as taking time to remove the solvent may occur. On the other hand, when it exceeds 60% by mass, the micropowder of fluororesin such as polytetrafluoroethylene tends to aggregate, and the state of fine particles can be maintained stably and in a fluid state. Since it becomes extremely difficult, it is not preferable.

<Compound represented by the above formula (I)>
The compound represented by the above (I) to be used in the present onset Ming, micropowder of fluororesin such as polytetrafluoroethylene micropowder nonaqueous solvent, uniform particles, it is possible to and stably dispersed Is. Its molecular structure is a terpolymer composed of vinyl butyral / vinyl acetate / vinyl alcohol, which is obtained by reacting polyvinyl alcohol (PVA) with butyraldehyde (BA), and has a butyral group, an acetyl group, and a hydroxyl group. By changing the ratio of these three types of structures (ratio of each of l, m, and n), solubility in oil-based solvents, and polytetrafluoroethylene micropowder in various resin materials It becomes possible to control the chemical reactivity when a non-aqueous dispersion of a micro-powder of fluororesin such as is added.

As the compound represented by the above (I), commercially available products such as Sleksui B series, K (KS) series, SV series, Kuraray Mobital series manufactured by Sekisui Chemical Co., Ltd. can be used.
Specifically, trade names of Sekisui Chemical Co., Ltd .; ESREC BM-1 (hydroxyl group amount: 34 mol%, butyralization degree 65 ± 3 mol%, molecular weight: 40,000), BH-3 (hydroxyl group amount) : 34 mol%, butyralization degree 65 ± 3 mol%, molecular weight: 110,000), BH-6 (hydroxyl group amount: 30 mol%, butyralization degree 69 ± 3 mol%, molecular weight: 92,000), BX- 1 (hydroxyl group amount: 33 ± 3 mol%, acetalization degree 66 mol%, molecular weight: 100,000), BX-5 (hydroxyl group quantity: 33 ± 3 mol%, acetalization degree 66 mol%, molecular weight: 130,000), BM-2 (hydroxyl amount: 31 mol%, butyralization degree 68 ± 3 mol%, molecular weight: 52,000), BM-5 (hydroxyl group amount: 34 mol%, butyralization degree 65 ± 3 mol%, molecular weight: 5 30,000), BL-1 (hydroxyl content: 36mo) %, Butyralization degree 63 ± 3 mol%, molecular weight: 190000), BL-1H (hydroxyl group amount: 30 mol%, butyralization degree 69 ± 3 mol%, molecular weight: 20,000), BL-2 ( Hydroxyl amount: 36 mol%, butyralization degree 63 ± 3 mol%, molecular weight: 2.7), BL-2H (hydroxyl group amount: 29 mol%, butyralization degree 70 ± 3 mol%, molecular weight: 28,000), Same BL-10 (hydroxyl group amount: 28 mol%, butyralization degree 71 ± 3 mol%, molecular weight: 15,000), KS-10 (hydroxyl group amount: 25 mol%, acetalization degree 65 ± 3 mol%, molecular weight: 17,000), and trade names of Kuraray Co., Ltd .; Mobital B145 (hydroxyl content: 21 to 26.5 mol%, acetalization degree 67.5 to 75.2 mol%), B16H (hydroxyl content) : 26.2-30.2 mol%, acetalization Degree 66.9 to 73.1 mol%, molecular weight: 1 to 20,000).
You may use these individually or in mixture of 2 or more types.

The content of the compound represented by the above (I) is preferably 0.1 to 15% by mass with respect to the micropowder of fluororesin such as polytetrafluoroethylene micropowder. When the content of this compound is less than 0.1% by mass, the dispersion stability is deteriorated, and the micropowder of fluororesin such as polytetrafluoroethylene micropowder tends to settle, and when it exceeds 15% by mass, the viscosity is high. It is not preferable.
In addition, various thermosetting resin materials such as epoxy resins and polyimide resin precursor materials, rubber, adhesives, lubricants and greases, printing inks and paints, etc. can be used for fluororesin micropowder such as polytetrafluoroethylene micropowder. Considering the characteristics when the non-aqueous dispersion is added, the content is preferably 0.1 to 10% by mass, more preferably 0.1 to 5% by mass, and most preferably 0.1 to 3% by mass.

In the non-aqueous dispersion of microparticles powder fluororesin such as polytetrafluoroethylene micropowder in the onset bright, without impairing the effect of the present first invention, in combination with the compound represented by the above (I) It is also possible to use other surfactants and dispersants.
For example, nonionic, anionic, and cationic surfactants and dispersants, nonionic, anionic, and cationic polymer surfactants and dispersants, regardless of whether they are fluorine or non-fluorine Although it can mention, it can use without being limited to these.

<Non-aqueous solvent>
The non-aqueous solvent used in the present onset bright, for example, for example, .gamma.-butyrolactone, acetone, methyl ethyl ketone, hexane, heptane, octane, 2-heptanone, cycloheptanone, cyclohexanone, cyclohexane, methylcyclohexane, ethylcyclohexane, methyl - n-pentyl ketone, methyl isobutyl ketone, methyl isopentyl ketone, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, ethylene glycol monoacetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monoacetate, diethylene glycol diethyl Ether, propylene glycol monoacetate, dipropylene glycol Cole monoacetate, propylene glycol diacetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexyl acetate, ethyl 3-ethoxypropionate, dioxane, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate , Butyl acetate, methyl pyruvate, ethyl pyruvate, methyl methoxypropionate, ethyl ethoxypropionate, anisole, ethyl benzyl ether, cresyl methyl ether, diphenyl ether, dibenzyl ether, phenetol, butyl phenyl ether, benzene, ethylbenzene, diethylbenzene , Pentylbenzene, isopropylbenzene, toluene, xylene, cymene , Mesitylene, methanol, ethanol, isopropanol, butanol, methyl monoglycidyl ether, ethyl monoglycidyl ether, butyl monoglycidyl ether, phenyl monoglycidyl ether, methyl diglycidyl ether, ethyl diglycidyl ether, butyl diglycidyl ether, phenyl diglycidyl ether , Methylphenol monoglycidyl ether, ethylphenol monoglycidyl ether, butylphenol monoglycidyl ether, mineral spirit, 2-hydroxyethyl acrylate, tetrahydrofurfuryl acrylate, 4-vinylpyridine, N-methyl-2-pyrrolidone, 2-ethylhexyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, Sidyl methacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, trimethylolpropane triacrylate, methacrylate, methyl methacrylate, styrene, perfluorocarbon, hydrofluoroether, hydrochlorofluorocarbon, hydrofluorocarbon, perfluoropolyether, N, N- Examples thereof include one non-aqueous solvent selected from the group consisting of dimethylformamide, N, N-dimethylacetamide, dioxolane, and various silicone oils, or those containing two or more of these non-aqueous solvents.
Among these non-aqueous solvents, preferably, it varies depending on each application (resin type such as adhesive resin type, circuit board use), etc., but methyl ethyl ketone, cyclohexanone, toluene, xylene, N-methyl- Examples include 2-pyrrolidone, methanol, ethanol, isopropanol, N, N-dimethylformamide, N, N-dimethylacetamide, and dioxolane.

Non-aqueous solvent used in the present onset Ming, water content by Karl Fischer method, and becomes what is preferred 8000ppm or less [0 ≦ water content ≦ 8000ppm].
In the first invention (including examples and the like to be described later), the measurement of water content by the Karl Fischer method is based on JIS K 0068: 2001 and is performed by MCU-610 (manufactured by Kyoto Electronics Industry Co., Ltd.). It was.
Depending on the polarity of the non-aqueous solvent used, one having high compatibility with water is considered. However, when the water content is 8000 ppm or more, the micro-powder of the fluororesin such as polytetrafluoroethylene micro-powder into the non-aqueous solvent is used. Dispersibility is significantly inhibited, and the solubility of the compound represented by the above (I) in a non-aqueous solvent is inhibited, which causes a rise in viscosity and aggregation of particles.
In this onset bright, the water content of the non-aqueous solvent by following 8000 ppm, low viscosity particle size, nonaqueous micropowder of fluorine resin such as excellent polytetrafluoroethylene micropowder storage stability It can be made into a dispersion. More preferably, the water content of the non-aqueous solvent is 5000 ppm or less, more preferably 3000 ppm or less, and particularly preferably 2500 ppm or less.

Additionally, non-aqueous dispersion of this onset Ming fluororesin, water content by Karl Fischer method, is preferably 8000ppm or less [0 ≦ water content ≦ 8000ppm].
In addition to the amount of moisture contained in the non-aqueous solvent, the moisture contained in the material itself such as the fluororesin micropowder and the compound represented by (I) above, or the fluororesin micropowder in It is conceivable that moisture from outside (water in the air, dew condensation on the device wall surface, etc.) is mixed in the manufacturing process to disperse. By doing so, a non-aqueous dispersion of a fluororesin micropowder with better storage stability can be obtained. More preferably, the water content of the non-aqueous dispersion is 5000 ppm or less, more preferably 3000 ppm or less, and particularly preferably 2500 ppm or less.

In order to set the water content of the non-aqueous solvent and the water content of the non-aqueous dispersion of the fluororesin to 8000 ppm or less, it is possible to use a generally used dehydration method of the non-aqueous solvent. For example, molecular sieves can be used. In addition, the fluororesin micropowder and the compound represented by the above (I) can be used in a state in which the amount of water is sufficiently reduced by dehydration by heating or decompression.
Furthermore, it is possible to remove water using a molecular sieve or a membrane separation method after preparing a non-aqueous dispersion of fluororesin micropowder. Any body can be used without particular limitation as long as it can reduce the water content of the body.

In this onset bright, but it is to use the non-aqueous solvent, which may also be used non-aqueous solvent and the other be used in combination with other non-aqueous solvents, used applications (various thermosetting resins Materials, rubber, adhesives, lubricants, greases, printing inks, paints, and the like are selected.
The content of the non-aqueous solvent to be used is the balance of the fluororesin micropowder, the compound represented by (I) above.

In this onset bright, it is preferable average particle diameter measured by dynamic light scattering method of micropowder fluorine resin in a non-aqueous dispersion (average particle diameter of cumulant method analysis in the scattered intensity distribution) is 1μm or less.
Even when a fluororesin micropowder such as polytetrafluoroethylene micropowder with a primary particle size of 1 μm or less is used, the primary particles usually aggregate and a micropowder with a particle size of 1 μm or more as a secondary particle It has become. By dispersing the secondary particles of the polytetrafluoroethylene micropowder so as to have a particle diameter of 1 μm or less, for example, using a disperser such as an ultrasonic disperser, three rolls, a ball mill, a bead mill, or a jet mill. By dispersing, a stable dispersion can be obtained even when stored for a long time with a low viscosity.
In order to disperse more stably, the dispersion is desirably 0.5 μm or less, more desirably 0.3 μm or less, whereby a more uniform dispersion can be obtained.

Non aqueous dispersion of the thus configured present onset Ming fluororesin, even without adding a surfactant or a dispersant containing a fluorine group, a low viscosity in particulate size, is excellent in storage stability Even after long-term storage, it has excellent redispersibility. Further, even when added to resin materials such as various thermosetting resins, rubbers, adhesives, lubricants, greases, printing inks, paints, and the like, they can be uniformly mixed.

Hereinafter, with this onset bright, further embodiment will be described in detail with reference to comparative examples. The present invention is not limited to the following examples.

[This onset AKIRA: Examples 1 to 7 and Comparative Example 1]
According to the formulation shown in Table 1 below, eight types of PTFE (A to H) of each specific surface area, and ESREC BL-10 [butyral (PVB) resin, manufactured by Sekisui Chemical Co., Ltd., as a compound represented by the above formula (I) A non-aqueous dispersion of a fluororesin was prepared using methyl ethyl ketone as a non-aqueous solvent, 28 mol% hydroxyl group, butyralization degree 71 ± 3 mol%, molecular weight 15,000]. In addition, although G and H of PTFE powder are the same, G used PTFE powder which changed the surface state by heating PTFE powder at the temperature of 270 degreeC, and adjusted the specific surface area.

In addition, in the above preparation, ESREC BL-10 was sufficiently dissolved in a non-aqueous solvent, and then polytetrafluoroethylene was added and further stirred and mixed.
The polytetrafluoroethylene mixed solution obtained as described above was dispersed with 0.3 mm-diameter zirconia beads using a horizontal bead mill, and each of the polytetrafluoroethylenes of Examples 1 to 7 and Comparative Example 1 was dispersed. A non-aqueous dispersion of fluoroethylene was obtained. In addition, when the water content by the Karl Fischer method of each non-aqueous dispersion of Examples 1 to 7 and Comparative Example 1 was measured, it was confirmed that the amount of water was 8000 ppm or less. As the evaluation of each non-aqueous dispersion, the average particle diameter and viscosity were measured, specifically, the average particle diameter (nm) of PTFE in each dispersion was measured with FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.) Each viscosity (mPa · s, 25 ° C.) was measured with an E-type viscometer. These results are shown in Table 2 below.

As can be seen from Table 1 and Table 2, range in an exemplary of the present onset Akira 1-7, although dispersion was possible, Comparative Example 1 is outside the scope of this onset Ming will gelled A good dispersion could not be obtained. Further, Example 7 having a specific surface area close to 15 m ² / g was a non-aqueous dispersion having a slightly high viscosity although it was dispersed. In addition, any non-aqueous dispersion was excellent in stability.

  The non-aqueous dispersion of fluororesin in the present invention is added uniformly to various resin materials (resist materials), rubber, adhesives, lubricants, greases, printing inks, paints, etc. for the purpose of improving product characteristics. It can be used for electronic devices, sliding materials, automobiles, kitchen utensils and the like.

Claims (1)

At least 5 to 60% by mass of a fluororesin micropowder having a specific surface area of 15 m ² / g or less, and 0.1% of the compound represented by the following formula (I) to the mass of the fluororesin micropowder. The average particle size (average particle size of cumulant method analysis in the scattering intensity distribution) of fluororesin micropowder in the non-aqueous dispersion is 1 μm or less, which includes ˜15% by mass and a non-aqueous solvent. Non-aqueous dispersion of fluororesin.