Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/08—Cellulose derivatives
  • C08L1/26—Cellulose ethers
  • C08L1/28—Alkyl ethers
  • C08L1/284—Alkyl ethers with hydroxylated hydrocarbon radicals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
  • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2327/00—Polyvinylhalogenides
  • B32B2327/12—Polyvinylhalogenides containing fluorine
  • B32B2327/18—PTFE, i.e. polytetrafluoroethylene

Definitions

• the present invention relates to a dispersion containing particles of a tetrafluoroethylene polymer.
• Patent Document 1 proposes an aqueous dispersion containing polytetrafluoroethylene having a volume average particle diameter of 1 to 50 ⁇ m after dispersion and a predetermined amount of a water-soluble thickener.
• a dispersion liquid with excellent dispersion stability and handling properties can be provided.
• Such a dispersion can be used to form a coating film (polymer layer) that is based on the tetrafluoroethylene polymer and has excellent physical properties such as heat resistance and electrical properties (low coefficient of linear expansion, low dielectric constant, and low dielectric loss tangent), and particularly has excellent surface appearance. ) etc. can be formed.
• Average particle diameter (D50) is the volume-based cumulative 50% diameter of particles or fillers determined by laser diffraction/scattering method. That is, the particle size distribution is measured by a laser diffraction/scattering method, a cumulative curve is determined with the total volume of the particle population as 100%, and the particle diameter is the point on the cumulative curve where the cumulative volume becomes 50%.
• the D50 of particles or fillers is determined by dispersing the particles in water and analyzing the particles using a laser diffraction/scattering method using a laser diffraction/scattering particle size distribution analyzer (LA-920 measuring instrument, manufactured by Horiba, Ltd.) .
• Average particle diameter (D90) is the volume-based cumulative 90% diameter of particles, which is determined in the same manner as D50.
• the specific surface area of particles or fillers is a value calculated by measuring particles by gas adsorption (constant volume method) BET multi-point method, and is determined using NOVA4200e (manufactured by Quantachrome Instruments).
• Melting temperature is the temperature corresponding to the maximum value of the melting peak of the polymer as measured by differential scanning calorimetry (DSC).
• DSC differential scanning calorimetry
• Glass transition point (Tg)” is a value measured by analyzing a polymer using a dynamic mechanical analysis (DMA) method.
• Viscosity is determined by measuring the dispersion using a B-type viscometer at 25° C.
• HLB value 20 x [sum of chemical formula weights of hydrophilic parts]/molecular weight
• the "degree of substitution" of cellulose ether is also called the degree of etherification, and is the hydroxyl group substituted with an alkoxyl group among the three hydroxyl groups on the glucose ring of cellulose. represents the number of items (average value).
• the degree of substitution can theoretically have a value between 0 and 3, and generally the higher the degree of substitution, the more hydrophilic it is.
• the degree of substitution is determined by converting the value measured by the method for analyzing the degree of substitution of hydroxypropyl methylcellulose described in the 18th edition of the Japanese Pharmacopoeia.
• the nonionic surfactant is adsorbed on the surface of the F particles, improving the dispersibility of the F particles in water.
• Such adsorption interactions are considered to be in an equilibrium state, and unadsorbed nonionic surfactant can be considered to exist at the gas-liquid interface.
• the stability of the aqueous dispersion is improved by the nonionic surfactant, and the aqueous dispersion is in a state in which bubbles are likely to be generated, and such bubbles become a starting point for the aggregation and coarsening of F particles. It can be considered that there is.
• F polymers include polytetrafluoroethylene (PTFE), polymers containing TFE units and units based on ethylene (ETFE), polymers containing TFE units and units based on propylene, TFE units and perfluoro(alkyl vinyl ether) (PAVE)
• PTFE polytetrafluoroethylene
• ETFE ethylene
• PAVE perfluoro(alkyl vinyl ether)
• a polymer (PFA) containing a unit based on (PAVE unit), a polymer (FEP) containing a TFE unit and a unit based on hexafluoropropylene are preferred, PFA or FEP is more preferred, and PFA is even more preferred.
• F polymer one type of these polymers may be used alone, two or more types may be used in combination, and units based on other comonomers may also be included.
• the oxygen-containing polar group may be contained in a unit based on a monomer in the F polymer, or may be contained in a terminal group of the main chain of the F polymer, with the former being preferred.
• Examples of the latter embodiment include an F polymer having an oxygen-containing polar group as a terminal group derived from a polymerization initiator, a chain transfer agent, etc., and an F polymer obtained by subjecting the F polymer to plasma treatment or ionizing radiation treatment.
• the monomer having a carbonyl group-containing group is preferably itaconic anhydride, citraconic anhydride, or 5-norbornene-2,3-dicarboxylic anhydride (hereinafter also referred to as "NAH"), and more preferably NAH.
• the specific surface area of the F particles is within the above range, the surface of the F particles will be easily wetted by water or a monool having 1 to 6 carbon atoms, which will be described later, and the aggregates of the F particles will be easily disintegrated, and the above-mentioned mechanism of action will be achieved. It is thought that it is more likely to occur.
• the F particles are particles containing F polymer, and are preferably composed of F polymer. More preferably, the F particles are particles of a heat-melting F polymer having an oxygen-containing polar group and having a melting temperature of 200 to 325°C. In this case, the above-mentioned mechanism of action is more fully expressed, and aggregation of F particles is more likely to be suppressed.
• the F particles may contain a resin or an inorganic compound other than the F polymer, or may form a core-shell structure in which the F polymer is the core and the shell is a resin or inorganic compound other than the F polymer.
• a core-shell structure may be formed in which the shell is made of a resin other than F polymer or an inorganic compound is made of a core.
• examples of the resin other than the F polymer include aromatic polyester, polyamideimide, polyimide, and maleimide
• examples of the inorganic compound include silica and boron nitride.
• nonionic surfactant contained in the present dispersion examples include glycol surfactants, acetylene surfactants, silicone surfactants, and fluorine surfactants.
• nonionic surfactant it is preferable to contain an alcoholic surfactant having an HLB value of less than 10 (hereinafter also referred to as "surfactant 1"). More preferably, the HLB value of Surfactant 1 is less than 4.
• Surfactant 1 is preferably an acetylene diol-based surfactant.
• Acetylene diol surfactants are surfactants that have a carbon-carbon triple bond in their molecules.
• Examples of acetylene diol-based surfactants include acetylene diol (having an acetylene bond and two hydroxyl groups in the same molecule) surfactants, and surfactants in which alkylene oxides such as ethylene oxide and propylene oxide are added to acetylene diol.
• alkylene oxides such as ethylene oxide and propylene oxide are added to acetylene diol.
• compounds represented by the following general formula (1) or (2) can be mentioned.
• R 1 and R 2 each independently represent an alkyl group having 3 to 9 carbon atoms
• R 3 and R 4 each independently represent an alkylene group having 1 to 4 carbon atoms
• m and n are Each independently represents an integer greater than or equal to 1, and the sum of m and n is 2 to 50.
• surfactant 1 which is an acetylene diol surfactant
• examples of surfactant 1, which is an acetylene diol surfactant include the "Surfynol (registered trademark)” series, the “Olfine (registered trademark)” series (both manufactured by Nissin Chemical Industry Co., Ltd.); Trademark) series (manufactured by Kawaken Fine Chemicals Co., Ltd.).
• the polyoxyalkylene-modified dimethylsiloxane may have a polydimethylsiloxane unit (-(CH 3 ) 2 SiO 2/2 -) in the main chain or a polydimethylsiloxane unit in the side chain. It may also have polydimethylsiloxane units in both the main chain and the side chain.
• Polyoxyalkylene-modified polydimethylsiloxane contains dimethylsiloxane units in the main chain and has an oxyalkylene group in the side chain, or polyoxyalkylene-modified polydimethylsiloxane contains dimethylsiloxane units in the main chain and has an oxyalkylene group in the side chain.
• Polyoxyalkylene-modified polydimethylsiloxane having an oxyalkylene group is preferred. Further, the oxyalkylene group contained in the polyoxyalkylene-modified dimethylsiloxane may consist of only one type of oxyalkylene group, or may consist of two or more types of oxyalkylene groups. In the latter case, different types of oxyalkylene groups may be connected in a random manner or in a block manner.
• nonionic surfactants include the "Ftergent” series (manufactured by Neos Corporation), the “Surflon” series (manufactured by AGC Seimi Chemical Co., Ltd.), the “Megafac” series (manufactured by DIC Corporation), " Examples include “Unidyne” series (manufactured by Daikin Industries, Ltd.), “Tergitol” series (manufactured by Dow Chemical Company, “Tergitol TMN-100X”, etc.).
• the content of the nonionic surfactant is preferably in the range of 1 to 15% by mass, more preferably in the range of 3 to 10% by mass, based on the F particles in the dispersion.
• One type of nonionic surfactant may be used, or two or more types may be used.
• the present dispersion liquid contains both Surfactant 1 and Surfactant 2 as the nonionic surfactants because the above-mentioned mechanism of action is more easily expressed.
• the content mass ratio of surfactant 1 and surfactant 2 is not particularly limited, and is, for example, 5:95. It can be set as appropriate within the range of ⁇ 95:5.
• the degree of substitution of cellulose ether contained in this dispersion is 1.4 or more.
• the degree of substitution of cellulose ether is preferably 1.9 or more, more preferably 2.1 or more. Further, the degree of substitution of cellulose ether is preferably 2.9 or less, more preferably 2.7 or less.
• the range of the degree of substitution of cellulose ether is preferably 1.4 to 2.9, more preferably 1.9 to 2.9, even more preferably 1.9 to 2.7.
• Examples of the cellulose ether include alkylcellulose, carboxyalkylcellulose, hydroxyalkylcellulose, and hydroxyalkylalkylcellulose, among which carboxyalkylcellulose, hydroxyalkylcellulose, and hydroxyalkylalkylcellulose are preferred.
• carboxyalkylcellulose examples include carboxymethylcellulose.
• examples of hydroxyalkylcellulose include hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and the like.
• examples of the hydroxyalkylalkylcellulose include hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, and hydroxyethylethylmethylcellulose. These may be used alone or in combination of two or more. Among these, hydroxyalkylcellulose or hydroxyalkylalkylcellulose is preferred, hydroxyalkylcellulose is more preferred, and hydroxyethylcellulose is even more preferred.
• the present dispersion may further contain a monool having 1 to 6 carbon atoms.
• the monool having 1 to 6 carbon atoms is a compound that is liquid at 25°C under atmospheric pressure, and preferably has a boiling point of 160°C or lower, and preferably has a boiling point of 120°C or lower. More preferred.
• a water-soluble compound having a surface tension of 20 to 30 mN/m is preferable, and it is preferable that the compound is azeotropic with water.
• water-soluble means that the solubility in water is 100 g/L or more.
• dispersion media may be used in this dispersion as long as the effects of the present invention are not impaired.
• Such other dispersion medium is preferably miscible with the monool and water described above.
• Other dispersion media include N-methyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, N,N-dimethylpropanamide, 3-methoxy-N,N-dimethylpropanamide, Amides such as -butoxy-N,N-dimethylpropanamide, N,N-diethylformamide, hexamethylphosphoric triamide, and 1,3-dimethyl-2-imidazolidinone; and ketones such as acetone and methyl ethyl ketone.
• inorganic fillers examples include quartz powder, silica, wollastonite, talc, silicon compounds such as silicon nitride, silicon carbide, and mica; nitrogen compounds such as boron nitride and aluminum nitride; aluminum oxide, zinc oxide, titanium oxide, and cerium oxide. , metal oxides such as beryllium oxide, magnesium oxide, nickel oxide, vanadium oxide, copper oxide, iron oxide, silver oxide; carbon fibers; carbon allotropes such as graphite, graphene, carbon nanotubes; metals such as silver and copper; It will be done.
• One type of inorganic filler may be used, or two or more types may be used in combination.
• the D50 of the inorganic filler is preferably 0.1 to 50 ⁇ m.
• the surface of the inorganic filler may be surface-treated with a silane coupling agent.
• inorganic fillers include silica fillers ("Adma Fine (registered trademark)” series (manufactured by Admatex), "SFP (registered trademark)” series (manufactured by Denka Corporation), “E-SPHERES” series (manufactured by Denka Corporation), ), zinc oxide filler ( ⁇ FINEX (registered trademark)'' series (manufactured by Sakai Chemical Industry Co., Ltd.), etc.), titanium oxide filler ( ⁇ Taipeke (registered trademark)'' series (manufactured by Ishihara Sangyo Co., Ltd.), “JMT (registered trademark)” series (manufactured by Teika Co., Ltd.), talc fillers ("SG” series (manufactured by Nippon Talc Co., Ltd.), etc.), steatite fillers ("BST” series (manufactured by Nippon Talc Co., Ltd.), etc.), nite fillers ("
• This dispersion liquid may further contain other resins different from the F polymer.
• Such other resins may be contained in the present dispersion as non-hollow particles, and may be included in the water constituting the present dispersion, and if necessary, the monool containing 1 to 6 carbon atoms and other dispersions. It may be dissolved or dispersed in a liquid dispersion medium (hereinafter also referred to as "liquid dispersion medium”) such as a liquid dispersion medium.
• polyester resins such as liquid crystalline aromatic polyesters, polyimide resins, polyamideimide resins, epoxy resins, maleimide resins, urethane resins, polyphenylene ether resins, polyphenylene oxide resins, and polyphenylene sulfide resins.
• aromatic polymers are preferred, and at least one aromatic imide polymer selected from the group consisting of aromatic polyimide, aromatic polyamic acid, aromatic polyamideimide, and precursors of aromatic polyamideimide is more preferred.
• the aromatic polymer is preferably contained in the dispersion as a varnish dissolved in a liquid dispersion medium.
• aromatic imide polymers include the "Yupia-AT” series (manufactured by Ube Industries, Ltd.), the “Neoprim (registered trademark)” series (manufactured by Mitsubishi Gas Chemical Co., Ltd.), and the “Spixeria (registered trademark)” series (manufactured by Somar Corporation). ), “Q-PILON (registered trademark)” series (manufactured by P.I.
• the content of the other resins relative to the F particles is preferably 1 to 25% by mass.
• This dispersion further contains a thixotropic agent, a viscosity modifier, an antifoaming agent, a dehydrating agent, a plasticizer, a weathering agent, an antioxidant, a heat stabilizer, a lubricant, an antistatic agent, a whitening agent, a coloring agent, It may contain additives such as a conductive agent, a mold release agent, and a flame retardant.
• This dispersion liquid contains F particles, a nonionic surfactant, cellulose ether, water, and if necessary, the above-mentioned monool having 1 to 6 carbon atoms, other dispersion media, inorganic fillers, other resins, additives, etc. obtained by mixing.
• This dispersion liquid may be obtained by mixing F particles, nonionic surfactant, cellulose ether, and water all at once, or may be obtained by mixing them separately in sequence, or by preparing a masterbatch of these in advance and mixing it with it. The remaining ingredients may be mixed. There is no particular restriction on the order of mixing, and the mixing method may be all at once or divided into multiple batches.
• F particles may be predispersed in a portion of water, then a nonionic surfactant and cellulose ether may be sequentially added and mixed, and the resulting mixture may be added to the remaining water to obtain the present dispersion.
• the nonionic surfactant may be added as it is or as an aqueous solution.
• Surfactant 1 and Surfactant 2 described above as nonionic surfactants there is no particular restriction on the order of addition, and they may be added as an aqueous solution in which both are dissolved.
• cellulose ether may be added as a powder or an aqueous solution thereof, or may be added in a state in which it is dispersed or dissolved in a liquid antifoaming agent or the like.
• a liquid antifoaming agent or the like if the above-mentioned monool having 1 to 6 carbon atoms, other dispersion medium, inorganic filler, other resin, additives, etc. are further mixed as necessary, they may be mixed at the time of mixing F particles and water. Often, the mixture may be mixed upon addition to water.
• the content of F particles in this dispersion is preferably more than 30% by mass from the viewpoints of making it easier to form a thick layered molded product and imparting high physical properties to the F polymer in the resulting molded product.
• the content is preferably 35% by mass or more, and more preferably 35% by mass or more.
• the content of F particles is preferably 75% by mass or less, more preferably 60% by mass or less.
• the content of the nonionic surfactant in the present dispersion is preferably 1 to 15 parts by weight, more preferably 3 to 10 parts by weight, based on 100 parts by weight of F particles.
• the content of water in this dispersion is preferably 25% by mass or more, more preferably 40% by mass or more.
• the content of water is preferably less than 70% by mass, more preferably 65% by mass or less. Further, the content of water in this dispersion is preferably 60 to 180% by mass based on the content of F particles.
• the content thereof is preferably 0.1% by mass or more, more preferably 1% by mass or more based on the present dispersion.
• the content of monool having 1 to 6 carbon atoms is preferably 10% by mass or less, and preferably 5% by mass or less.
• the viscosity of the present dispersion is preferably 10 mPa ⁇ s or more, more preferably 100 mPa ⁇ s or more.
• the viscosity of the present dispersion is preferably 10,000 mPa ⁇ s or less, more preferably 3,000 mPa ⁇ s or less.
• the present dispersion has excellent coating properties and is easy to form molded articles such as coating films (polymer layers) having arbitrary thicknesses. Further, the present dispersion having a viscosity within this range tends to exhibit the physical properties of the F polymer to a high degree in molded articles formed therefrom.
• the thixotropic ratio of this dispersion is preferably 1.0 to 3.0. In this case, the present dispersion has excellent coating properties and homogeneity, and can easily produce denser molded products.
• the pH of this dispersion is more preferably 8 to 10 from the viewpoint of improving long-term storage properties.
• the pH of this dispersion can be determined by using a pH adjuster (amine, ammonia, citric acid, etc.) or a pH buffer (tris(hydroxymethyl)aminomethane, ethylenediaminetetraacetic acid, ammonium bicarbonate, ammonium carbonate, ammonium acetate, etc.). It can be adjusted by a pH adjuster (amine, ammonia, citric acid, etc.) or a pH buffer (tris(hydroxymethyl)aminomethane, ethylenediaminetetraacetic acid, ammonium bicarbonate, ammonium carbonate, ammonium acetate, etc.). It can be adjusted by
• this dispersion is subjected to a molding method such as extrusion into a sheet shape, a molded article such as a sheet containing the F polymer can be formed.
• the sheet obtained by extrusion may be further subjected to press molding, calendar molding, etc. and then cast.
• the sheet is further heated to remove the liquid dispersion medium and sinter the F polymer.
• the thickness of the sheet formed from this dispersion is preferably 1 to 1000 ⁇ m. Suitable ranges of the dielectric constant, dielectric loss tangent, and thermal conductivity of the sheet are the same as the ranges of the dielectric constant, dielectric loss tangent, and thermal conductivity of the molded article, respectively.
• the thermal conductivity of the sheet means the thermal conductivity in the in-plane direction of the sheet.
• the coefficient of linear expansion of the sheet is preferably 100 ppm/°C or less, more preferably 80 ppm/°C or less.
• the lower limit of the linear expansion coefficient of the sheet is 30 ppm/°C.
• the linear expansion coefficient means a value obtained by measuring the linear expansion coefficient of a test piece in the range of 25° C. or higher and 260° C. or lower according to the measurement method specified in JIS C 6471:1995.
• a laminate can be formed by laminating such sheets on a base material.
• Examples of the method for manufacturing the laminate include a method of extrusion molding the present dispersion onto the base material, a method of thermocompression bonding the sheet and the base material, and the like.
• the shape of the base material examples include a planar shape, a curved shape, and an uneven shape. Further, the shape of the base material may be any of foil, plate, film, and fiber. The ten-point average roughness of the surface of the base material is preferably 0.01 to 0.05 ⁇ m. The surface of the base material may be surface-treated with a silane coupling agent or may be plasma-treated.
• Heating during firing of the F polymer is preferably carried out at a temperature equal to or higher than the melting temperature of the F polymer, more preferably at 360 to 400° C. for 0.1 to 30 minutes.
• Examples of heating devices for each heating include an oven and a ventilation drying oven.
• the heat source in the device may be a contact heat source (hot air, hot plate, etc.) or a non-contact heat source (infrared rays, etc.).
• each heating may be performed under normal pressure or under reduced pressure.
• the atmosphere in each heating may be an air atmosphere or an inert gas (helium gas, neon gas, argon gas, nitrogen gas, etc.) atmosphere.
• the F layer is formed through the steps of disposing and heating the dispersion. These steps may be performed once or may be repeated two or more times.
• the present dispersion may be placed on the surface of the base material and heated to form an F layer, and the present dispersion may be further placed on the surface of the F layer and heated to form a second F layer.
• the present dispersion liquid may be further placed on the surface and heated to form the F layer.
• the present dispersion liquid may be disposed on only one surface of the substrate, or may be disposed on both surfaces of the substrate.
• a laminate is obtained that has a base layer and an F layer on one surface of the base layer
• a laminate is obtained that has a base layer and an F layer on both surfaces of the base layer.
• a laminate is obtained.
• the thickness of the F layer varies depending on the use of the laminate, but is preferably in the range of 1 to 1000 ⁇ m.
• This dispersion liquid is useful as a material for imparting insulation, heat resistance, corrosion resistance, chemical resistance, water resistance, impact resistance, and thermal conductivity.
• this dispersion liquid is used in printed wiring boards, thermal interface materials, power module substrates, coils used in power devices such as motors, in-vehicle engines, heat exchangers, vials, syringes, Ampules, medical wires, secondary batteries such as lithium ion batteries, primary batteries such as lithium batteries, radical batteries, solar cells, fuel cells, lithium ion capacitors, hybrid capacitors, capacitors, capacitors (aluminum electrolytic capacitors, tantalum electrolytic capacitors, etc.) ), electrochromic devices, electrochemical switching devices, electrode binders, electrode separators, and electrodes (positive and negative electrodes).
• the present dispersion is also useful as an adhesive for bonding parts together.
• this dispersion liquid can be used for adhesion of ceramic parts, adhesion of metal parts, adhesion of electronic parts such as IC chips, resistors, and capacitors on substrates of semiconductor elements and module parts, adhesion of circuit boards and heat sinks, and adhesion of LEDs. Can be used to bond chips to substrates.
• Molded products such as sheets and laminates formed from the present dispersion are useful as antenna parts, printed circuit boards, aircraft parts, automobile parts, sports equipment, food industry products, heat dissipation parts, and the like.
• electric wire coating materials aircraft wires, flat wires, FFC (Flexible flat cable), etc.
• enamelled wire coating materials used for motors of electric vehicles, etc. coating materials for power generation, electrical insulating tapes, Insulating tape for oil drilling, oil transportation hoses, hydrogen tanks, materials for printed circuit boards, separation membranes (precision filtration membranes, ultrafiltration membranes, reverse osmosis membranes, ion exchange membranes, dialysis membranes, gas separation membranes, etc.), electrode binders ( (for lithium secondary batteries, fuel cells, etc.), carrier films for fuel cells, tape base films for semiconductor manufacturing processes (dicing tapes, pickup tapes, etc.), release films for semiconductor molding, liquid crystal antennas, reflectors, transmission lines.
• electric wire coating materials aircraft wires, flat wires, F
• base films for COF Chip on film
• electrostatic chucks for semiconductor manufacturing processes electrostatic chucks for display manufacturing processes, copy rolls, furniture, automobile dashboards, covers for home appliances, etc.
• sliding members load bearings, yaws, etc.
• tension ropes wear pads, wear strips, tube lamps, Test sockets, wafer guides, centrifugal pump wear parts, chemical and water supply pumps, tools (shovels, files, chisels, saws, etc.), boilers, hoppers, pipes, ovens, baking molds, chutes, racket guts, dies, toilet bowls , container covering materials, mounted heat dissipation boards for power devices, heat dissipation members for wireless communication devices, transistors, thyristors, rectifiers, transformers, power MOS FETs,
• F particle 2 A tetrafluoroethylene polymer containing 97.5 mol% and 2.5 mol% of TFE units and PPVE units in this order, and having 50 carbonyl group-containing groups per 1 ⁇ 10 6 carbon atoms in the main chain ( Melting temperature: 300°C) particles (D50: 2.2 ⁇ m, specific surface area: 6 m 2 /g) [Nonionic surfactant]
• Example 1 F particles 1, surfactant 1, surfactant 2, cellulose ether 1 and water were mixed at 2000 rpm using a rotation and revolution stirrer (manufactured by Shinky Co., Ltd., trade name: "Awatori Rentaro (registered trademark) ARE-310"). Stir for 10 minutes at ) and water (50.0 parts by mass) were obtained. Dispersion 1 (viscosity: 1000 mPa ⁇ s) was obtained.
• Example 2 F particles 1 (46.5 parts by mass), surfactant 1 (3.2 parts by mass), and cellulose ether 1 (0.3 parts by mass) were prepared in the same manner as in Example 1 except that surfactant 2 was not added. ) and water (50.0 parts by mass) were obtained.
• Example 3 F particles 1 (46.5 parts by mass), surfactant 2 (3.2 parts by mass), and cellulose ether 1 (0.3 parts by mass) were prepared in the same manner as in Example 1 except that surfactant 1 was not added. ) and water (50.0 parts by mass) were obtained.
• the dispersion liquid of the present invention has excellent dispersion stability and handling properties. Further, it is possible to form molded products such as coating films (polymer layers) that exhibit the physical properties of the F polymer to a high degree and have particularly excellent surface appearance.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=89117992

Family Applications (1)

Country Status (5)

Citations (8)

Family Cites Families (1)

• 2023
  • 2023-04-14 JP JP2024526261A patent/JPWO2023238505A1/ja active Pending
  • 2023-04-14 CN CN202380046235.1A patent/CN119343402A/zh active Pending
  • 2023-04-14 WO PCT/JP2023/015138 patent/WO2023238505A1/ja active Application Filing
  • 2023-04-14 KR KR1020247030765A patent/KR20250022653A/ko active Pending
  • 2023-04-18 TW TW112114363A patent/TW202400689A/zh unknown

Patent Citations (8)

Also Published As

Similar Documents

Legal Events