WO2007132736A1 - 粉体塗料組成物 - Google Patents
粉体塗料組成物 Download PDFInfo
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- WO2007132736A1 WO2007132736A1 PCT/JP2007/059681 JP2007059681W WO2007132736A1 WO 2007132736 A1 WO2007132736 A1 WO 2007132736A1 JP 2007059681 W JP2007059681 W JP 2007059681W WO 2007132736 A1 WO2007132736 A1 WO 2007132736A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on 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; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on 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; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6275—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds
- C08G18/6279—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds containing fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2150/00—Compositions for coatings
- C08G2150/20—Compositions for powder coatings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
Definitions
- the present invention relates to a powder coating composition.
- powder coating is an advantage in terms of pollution-free, resource-saving, and labor-saving. It is widely used for metal coating in general, especially for bridges, railings, gates, fences, and houses that are important for weather resistance. It is also widely used in road building materials such as siding materials, car bodies and parts, and home appliances.
- thermoplastic fluorocoating powder coating method having an ethylene-tetrafluoroethylene copolymer strength is known (Patent Documents 1 to 3 below).
- thermosetting powder coatings used for powder coating polyester resin-based powder coatings using block isocyanate compounds, triglycidyl isocyanurate, etc. as curing agents, and dibasic acids as curing agents
- An acrylic resin-based powder coating having a glycidyl group is known (Non-patent Document 1 below).
- the former paint composed of thermoplastic fluororesin-based powder has good weather resistance, but it has poor pigment dispersibility, glossiness of the coating surface and adhesion to the material, and the fluororesin in the painting operation. It has to be heated to a temperature higher than the melting point of the fat, and there are drawbacks in coating workability such as consuming a large amount of heat energy.
- polyester-resin-based powder coating and acrylic-resin-based powder coating do not have the disadvantages of the powder coating composed of the thermoplastic fluoro-resin-based powder, but instead have sufficient weather resistance. There are disadvantages.
- Patent Document 4 shown below contains a fluororefin unit, a fluorine content of 10% by weight or more, and an intrinsic viscosity measured in tetrahydrofuran at 30 ° C is 0.
- a fluorine-containing copolymer (A) having a glass transition temperature of 30 to 120 ° C and having a crosslinkable reactive group, and the fluorine-containing copolymer (A) Curing agent capable of forming a crosslink by reacting with a crosslinkable reactive group [However, an isocyanate bonded directly to a silicon atom Excluding the polyfunctional organosilicon compound containing a single group] (B) and (A) / (B) blended so that the weight ratio is 40/60 to 98/2
- a thermosetting powder coating composition characterized by the loss of heat of the fluorine-containing copolymer (A) being 5% by weight or less under a condition of 3 hours at 105 ° C, and particularly the composition
- thermosetting fluorine powder coating compositions has been expanded to sashes made of building skins, etc., and more advanced coating flexibility and appearance are required.
- the flexibility of the coating film can be improved, for example, by increasing the molecular weight of the fluorinated copolymer that serves as the binder component in the coating composition. This increases the melt viscosity of the resin. In the case of a powder coating that undergoes a film formation process from melting by heating to a curing reaction, the appearance of the coating film deteriorates as the melt viscosity increases. Conversely, when the molecular weight of the fluorinated copolymer is lowered, the melt viscosity is lowered and the appearance of the coating film is improved, but the flexibility is lowered.
- the melting start temperature can be lowered by lowering the glass transition point, so that it can flow fully to the reaction start temperature of the curing agent.
- the glass transition point becomes 50 ° C or less, and there is a blocking problem that solid powder coatings harden during storage and cannot be applied.
- Patent Document 5 proposes a composition in which a fluorine copolymer mainly composed of vinylidene fluoride and an acrylic polymer mainly composed of methyl methacrylate are mixed.
- the copolymer based on vinylidene fluoride has crystallinity, so that the transparency is lowered and it is difficult to form a coating film with excellent appearance.
- Patent Document 6 introduces a technique for blending thermoplastic fluorine resin into a thermosetting fluorine resin powder coating composition.
- a relatively high molecular weight thermoplastic fluororesin improves physical properties, and the thermoplastic resin does not cause a curing reaction.
- improvement in appearance can be expected, since the compatibility between the thermosetting fluororesin powder coating composition and the thermoplastic fluororesin is inferior, it is difficult to obtain a coating film with a low gloss and an excellent appearance.
- blending thermoplastic fluororesin into a thermosetting fluororesin powder coating composition is actually accompanied by manufacturing difficulties.
- thermosetting powder coating composition requires grinding the thermosetting powder coating pellet after the kneading step, but efficiently grinding the thermoplastic resin. In order to achieve this, it is necessary to carry out freeze pulverization such as cooling below the brittle point, which requires considerable energy for pulverization.
- Patent Document 1 Japanese Patent Laid-Open No. 61-181567
- Patent Document 2 Japanese Patent Application Laid-Open No. 61-181571
- Patent Document 3 Japanese Patent Application Laid-Open No. 61-181572
- Patent Document 4 Japanese Patent No. 1973174
- Patent Document 5 JP-A-9 165535
- Patent Document 6 Japanese Unexamined Patent Application Publication No. 2004-35876
- Non-Patent Document 1 "powder and industry” Japan Powder Industrial Technology Association of supervision, February 1984, 33-42 Bae 1 ⁇ ⁇ Shea
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a powder coating composition capable of simultaneously achieving a good coating film appearance and flexibility while preventing blocking in the powder coating.
- the powder coating composition of the present invention (A) black port Torifuruoro ethylene and Z or tetrafluoropropoxy O b 45-55 mole 0/0 of ethylene, (B) the number of carbon atoms 2 to 40 mol% of vinyl ethers having an alkyl group containing 4 or 5 alkyl groups containing a tertiary carbon atom, and (C) 5 to 5 of vinyl ethers having a functional group capable of crosslinking reaction.
- (E) an alkyl group having a carbon number of 3 to 5 comprises 0-32 mole 0/0 Bulle ester having an alkyl group containing a tertiary or higher carbon atom, the (B ) And (E), a copolymer obtained by polymerizing a monomer mixture having a total content of 30 to 50 mol%, Contains a fluorinated copolymer (X) having a glass transition point of 50 ° C or higher and a number average molecular weight of 10,000 to 2,000, and a curing agent (Y) capable of reacting with the functional group capable of crosslinking. It is characterized by doing.
- a powder coating composition can be obtained that can be used as a powder coating at room temperature without problems, and that has both a good coating film appearance and flexibility.
- the fluorine-containing copolymer (X) is a copolymer obtained by polymerizing the following monomers.
- black trifluoroethylene or tetrafluoroethylene or both may be used in combination. It is an important monomer for the formation of a fluorine-containing copolymer that gives excellent weather resistance by alternating copolymerization with a monomer that is a powerful vinyl ether. Black-mouthed trifluoroethylene is more susceptible to alternating copolymerization.
- black trifluoroethylene is superior in terms of adhesion and pigment dispersibility in the coating film of the fluorinated copolymer compared to tetrafluoroethylene. Better ,.
- black trifluoroethylene when black trifluoroethylene is used, the surface tension of the fluorinated copolymer is larger than when tetrafluoroethylene is used, and it is used in many thermosetting powder coatings. Since it is close to the surface tension of the branched polyester resin, even if the fluorine-containing resin is mistakenly mixed in the polyester resin powder coating, film defects such as repelling are unlikely to occur. Therefore, black trifluoroethylene is more preferred in view of the fact that the powder coating composition of the present invention can be manufactured by diverting the existing polyester resin-based powder coating manufacturing equipment.
- the amount of the monomer (A) used is the total of all monomers used for the synthesis of the fluorinated copolymer (X) (that is, used for the synthesis of the fluorinated copolymer (X).
- the entire monomer mixture Same as below. 45-55 Monore 0/0 force preferably against), preferably from 48 to 52 Monore 0/0 force! /,. If it is 45 mol% or more, the weather resistance by the fluorinated copolymer (X) will be good.
- the amount of the homopolymer of the monomer (A) in the fluorinated copolymer (X) is small and the crystallinity is suppressed, so that the transparency of the coating film is improved, and the unit The alternating copolymerization property of the monomer (A) and vinyl ethers is good, and the weather resistance of the coating film is good.
- the monomer (B) is a butyl ether having an alkyl group having 4 or 5 carbon atoms and containing a tertiary carbon atom.
- the substituent length in the general formula (1) is “an alkyl group having 4 or 5 carbon atoms and containing a tertiary carbon atom”.
- the monomer (B) examples include tert-butyl butyl ether, isobutyl butyl ether, neopentyl butyl ether, and 2-ethyl propyl butyl ether. Of these, ter butyl butyl ether is preferred because the glass transition point of the fluorinated copolymer (X) tends to be high!
- the alkyl group as the substituent R contains a tertiary carbon atom, whereby the flexibility of bending of the main chain of the copolymer is suppressed by steric hindrance,
- a crosslinking reaction is carried out using a curing agent, a cyclization reaction in which functional groups in one molecule are crosslinked with each other is suppressed.
- an illegal reaction occurs. Accordingly, the cross-linking reaction becomes uniform, the curing shrinkage stress after the cross-linking reaction becomes uniform, and a coating film having excellent appearance and flexibility can be formed.
- the carbon number of the alkyl group as the substituent R is 5 or less, it is preferable for powder coating applications, and a glass transition point of 50 ° C. or higher can be easily obtained!
- Monomer (B) may be used alone or in combination of two or more.
- the amount of monomer (B) used is based on the total amount of monomers used for the synthesis of fluorine-containing copolymer (X). 2-40 mole 0/0 force S preferably Te, and more preferably 3 to 30 mole 0/0.
- the monomer (B) is the 2 mole 0/0 or more, preferred as a powder coating applications, both the 50 ° C or higher the glass transition point is obtained, the fluorinated copolymer (X) Main The degree of freedom of chain is well suppressed, and the appearance and physical properties of the coating film are improved.
- the monomer (C) contributing to the crosslinking reaction can be appropriately introduced into the fluorine-containing copolymer (X). A coating film with excellent physical properties can be obtained.
- the monomer (C) is a vinyl ether having a functional group capable of crosslinking reaction.
- the substituent length in the general formula (1) is “a substituent having a functional group capable of crosslinking reaction”.
- functional groups capable of crosslinking reaction include a hydroxyl group, a carboxy group, a glycidyl group, an isocyanate group, and a bur group.
- the copolymer is excellent in stability and easily available! ⁇ ⁇ ⁇ Hydroxyl is preferred because it can use a curing agent.
- the “substituent having a functional group capable of crosslinking reaction” as the substituent R in the general formula (1) is a chain or branched structure in which one hydrogen atom is substituted with the “functional group capable of crosslinking reaction”.
- Preferred are cyclic or cyclic alkyl groups!
- the number of carbon atoms of the alkyl group (not including the carbon atom of the functional group capable of crosslinking reaction) is preferably 2-8, more preferably 2-5.
- the monomer (C) include hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether, hydroxybutyl vinyl ether, hydroxy neopentyl vinyl ether; cyclohexyl methyl vinyl ether monomethyl alcohol ([4 ( Examples thereof include hydroxy cycloalkyl vinyl ethers such as vinyloxymethyl) cyclohexyl]) methan— 1-ol).
- hydroxybutyl vinyl ether is preferred because of its excellent reactivity and low glass transition point. /.
- Monomer (C) may be used alone or in combination of two or more.
- the amount of the monomer (C) is 5 to 20 mol 0/0 preferably fixture 5-15 mole 0/0 to the total monomers used in the synthesis of the fluorinated copolymer (X) is More preferred. If it is 5 mol 0/0 or more, the physical properties of the coating film becomes good in sufficient crosslinking sites in the coating film is formed. On the other hand, if the monomer (C) is 20 mol% or less, the cross-linked site becomes appropriate, the coating film does not become too hard, and the toughness decreases. Hateful.
- the monomer (D) is a butyl ether other than the vinyl ethers contained in the monomer (B) or the monomer (C). That is, the monomer contained in the monomer (B) and the monomer contained in the monomer (C) are not included in the monomer (D).
- the alkyl group as the substituent R in the general formula (1) is a single group in the presence of the monomer (B) which may be linear, branched or cyclic.
- a linear alkyl group is preferred because of its excellent reactivity with the monomer (A).
- the linear alkyl group preferably has 2 to 6 carbon atoms, more preferably 2 to 4 carbon atoms.
- Preferable examples of the monomer (D) include ethyl vinyl ether, n -butyl vinyl ether and the like. Among these, ethyl vinyl ether is more preferable because the glass transition point is unlikely to decrease.
- the monomer (D) may be one kind or two or more kinds.
- the monomer (D) is not essential, but the flexibility is further improved by using it.
- the amount used is preferably 1 to 15 mol% with respect to all monomers used for the synthesis of fluorine-containing copolymer (X). 5 to 15 mol% 5 to 10 mol% is more preferable.
- the amount of monomer (D) is preferably 1 to 15 mol% with respect to all monomers used for the synthesis of fluorine-containing copolymer (X). 5 to 15 mol% 5 to 10 mol% is more preferable.
- the monomer (E) is a bull ester having an “alkyl group having 3 to 5 carbon atoms and containing a tertiary or higher carbon atom”.
- R ′ is an alkyl group having 3 to 5 carbon atoms, and at least one of the carbon atoms constituting the alkyl group is 3 or 4 carbon atoms (the carbon atom constituting the ester bond COO). (Including children). R ′ has 3 to 5 carbon atoms, and 4 is more preferable.
- the monomer (E) examples include bivalerate butyl, isobutyrate butyl, and pivalate butyl. , Isovaleric acid bur, hydroangelic acid bul, and the like. Of these, vinyl bivalinate is preferred because of the high glass transition point of the fluorine-containing copolymer (X). In the fluorine-containing copolymer (X), the monomer (E) may be one type or two or more types.
- the amount of the monomer (E) used is in the range of 0 to 32 mol% with respect to the total amount of monomers used for the synthesis of the fluorinated copolymer (X). ) the sum of (E) is made to be 30-50 mole 0/0 relative to the total monomers. Flame, to be the temperature exceed 50 ° C. The glass transition point of the total less than 30 mole 0/0! /, A fluorine-containing Mototomo polymer (X) of the monomer (B) and (E). The total content of the monomer (B) and (E) is preferably 30 to 40 mole 0/0.
- the monomer (E) when the monomer (B) is 30 mol% or more of the total monomers, the monomer (E) may not be used (the amount of the monomer (E) used) 0 mol% may also be used). In this case, when using monomer (E), the amount used is set so that the sum of monomers (B) and (E) is preferably within the above range, with 1 mol% or more being preferred.
- monomer (B) is 2 mol% or more and less than 30 mol% of all monomers, monomer (E) is essential, and all monomers used for the synthesis of fluorine-containing copolymer (X) It is preferable to use 1 mol% or more and 32 mol% or less of monomer (E) with respect to the monomer. The sum of monomers (B) and (E) is within the above range.
- the monomer (B) and the monomer (E) in combination.
- the amount of monomer (B) relative to the content of monomer (E) in all monomers used for the synthesis of fluorine-containing copolymer (X) The molar ratio (B) / (E) of the content is preferably 2Z39 to 2Z3, more preferably 1Z11 to LOZ25.
- (B) Z (E) is not less than the lower limit and not more than the upper limit of the above range, a coating film having an excellent balance of toughness appearance can be obtained.
- a double bond-containing monomer ((B) to (B) which can be copolymerized with chlorofluoroethylene or tetrafluoroethylene as necessary. E) may be used.
- examples of other monomers that can be used include butyl esters, allylic ethers, allylic esters, acrylates, and meta acrylates that are not included in the monomer (E).
- the amount used is sufficient for the synthesis of the fluorinated copolymer (X). 10 mol% or less is preferable with respect to all the monomers used.
- the fluorine-containing copolymer (X) is added to a mixture containing the monomers (A) to (E) and, if necessary, other monomers in a predetermined ratio, in the presence or absence of a polymerization medium. Under the above, it can be produced by carrying out a polymerization reaction by acting a polymerization initiator such as a polymerization initiator or ionizing radiation.
- a polymerization initiator such as a polymerization initiator or ionizing radiation.
- the fluorine-containing copolymer (X) has a number average molecular weight of 10,000 to 22,000, preferably 12,000 to 18,000. If it is 10,000 or more, the number of functional groups capable of crosslinking reaction per molecule is sufficient, and the strength of the coating film after crosslinking reaction is improved. If it is 22,000 or less, an increase in melt viscosity in the range of 160 ° C to 220 ° C, which is the usual baking temperature for thermosetting powder coatings, is suppressed, and a coating film having a good appearance can be obtained.
- the value of the number average molecular weight of the fluorinated copolymer (X) in the present invention is a value determined in terms of polystyrene by gel permeation chromatography (GPC).
- the number average molecular weight of the fluorinated copolymer (X) can be controlled by the amount of initiator added, the use of a chain transfer agent, and the concentration of Z or the monomer in the polymerization system.
- the glass transition point of the fluorinated copolymer (X) is 50 ° C or higher.
- the solid powder coatings harden during storage at room temperature and cannot be coated. Blocking is well prevented.
- the glass transition point of the fluorinated copolymer (X) can be controlled by the type of side chain of the monomer and the Z or molecular weight. Specifically, it is preferable to use the monomer (B) and the monomer (E) in order to bring the glass transition point to 50 ° C. or higher. Further, it is preferable to increase the molecular weight of the fluorinated copolymer (X).
- the upper limit of the glass transition point of the fluorinated copolymer (X) is not particularly limited. However, when the fluorinated copolymer (X) is non-crystalline and the coating film of the powder coating is formed, the liquid of the coating Because it cures through the heat treatment, liquefaction begins at around 100 to 120 ° C, which is lower than the starting temperature of 170 to 210 ° C for general thermosetting powder coatings.
- the temperature is preferably 100 ° C. or less from the viewpoint that it is ideal that the coated film before curing is formed well by flowing on the surface of the object.
- the content of the fluorinated copolymer (X) in the powder coating composition of the present invention is 44 to 80 quality. 50% to 60% by mass is more preferred.
- the curing agent ( ⁇ ) may be any compound that can react with the functional group capable of crosslinking reaction present in the fluorine-containing copolymer (X).
- a polyisocyanate curing agent is suitable.
- polyisocyanate curing agents include isophorone diisocyanate and hexamethylene diisocyanate adducts, which are identified by protecting the isocyanate groups with epsilon-powered prolatatum oximes.
- Block isocyanate configured to start the reaction by dissociation of the protecting group at the temperature of the block; Free of blocking agent configured to start reaction by dissociating at a specific temperature by coupling the isocyanate groups
- Polyisocyanate and the like are preferred.
- Specific product names include Vestagon series made by Degussa, Clerant series made by Neunerne, and Arcure series made by Eastman.
- curing agents other than polyisocyanate examples include melamine curing agents having a glycoluria structure (for example, trade name: Powder Link series manufactured by Cymel).
- the content of the curing agent ( ⁇ ) in the powder coating composition of the present invention is defined as 1 in terms of the number of moles of functional groups that can react with the curing agent ( ⁇ ) present in the fluorine-containing copolymer (X).
- the molar ratio (INDEX) of crosslinking reactive groups present in the curing agent ( ⁇ ) is preferably 0.7 to 1.3, more preferably 0.8 to 1.2 force. Ms./ !.
- the powder coating composition includes, as necessary, a color pigment, an extender pigment, a defoaming agent, an antioxidant, an ultraviolet absorber, a radical Additives such as scavengers, surface conditioners, preservatives, corrosion inhibitors, antibacterial agents, curing reaction catalysts, flow modifiers; waxes; thermoplastic or thermosetting fluorine resins; acrylic resins, polyester resins It may contain non-fluorinated greaves such as fat.
- the total content of other components in the powder coating composition of the present invention is 45% by mass or less.
- the lower is preferable. 30 to 40% by mass is more preferable.
- the powder coating composition of the present invention comprises, for example, a fluorine-containing copolymer (X), a curing agent (Y), and, if necessary, other components mixed in a solid state and then melted. It can be produced by a method of kneading and cooling to form a lump, which is pulverized into a powder.
- the step of mixing each component in a solid state can be performed using a mixer such as a high-speed mixer, a V-type mixer, or an inversion mixer.
- a mixer such as a high-speed mixer, a V-type mixer, or an inversion mixer.
- Each component is preferably mixed in powder form.
- the melt-kneading process can be performed using various types of extruders such as single-shaft, twin-shaft, and planetary gear.
- a mixture of each component is kneaded in a heated and melted state so as to make each component uniform. It is preferable to cool the extruded melt-kneaded product into pellets.
- the step of pulverizing the pellet-shaped composition can be performed using a pulverizer such as a pin mill, a hammer mill, a jet mill or the like. After pulverization, it is preferable to perform a classification step in order to obtain a necessary particle size.
- a pulverizer such as a pin mill, a hammer mill, a jet mill or the like. After pulverization, it is preferable to perform a classification step in order to obtain a necessary particle size.
- the particle size of the powder coating composition thus obtained can be made equal to the particle size of a general powder coating.
- a 50% average volume particle size distribution is preferably about 25-50 / ⁇ .
- Measurement of the particle size of a powder coating is usually carried out using a particle size measuring instrument such as a type that captures potential changes when passing through pores, a laser single diffraction method, an image judgment format, a sedimentation velocity measurement method, and the like.
- the powder coating composition of the present invention is applied to an object to be coated using a coating means such as an electrostatic coating machine, a fluid immersion coating machine, a frictional charging coating machine, a cloud coating machine, or a brush type coating machine. .
- a coating means such as an electrostatic coating machine, a fluid immersion coating machine, a frictional charging coating machine, a cloud coating machine, or a brush type coating machine.
- metal objects such as aluminum, iron and magnesium are suitable.
- a coating film is formed by baking at a predetermined temperature.
- the baking temperature is set according to the reaction temperature of the curing agent used.
- the baking temperature when using a polyisocyanate curing agent is usually about 170 to 210 ° C.
- the thickness of the coating film is not particularly limited, but is generally 100 m or less.
- the glass transition point of the fluorine-containing copolymer (X) contained in the powder coating composition of the present invention is 50 ° C or more, the powder coating compositions harden during storage. Blocking is effectively prevented.
- the coating film formed using the powder coating composition of the present invention has excellent smoothness, good gloss, good appearance, excellent flexibility, and In addition to being hardly damaged by deformation, the coating film has high hardness.
- the coating film component is a fluorine-containing copolymer, the weather resistance is excellent.
- the reason is considered as follows. That is, the present inventors pay attention to the curing shrinkage phenomenon after the curing reaction of the thermosetting powder coating, and cure with a non-uniform network structure due to a phenomenon in which crosslinking occurs between crosslinkable functional groups in the same molecule. It was found that when the state was formed, uneven curing shrinkage occurred, resulting in a decrease in the appearance of the coating film, a decrease in physical properties, particularly a decrease in flexibility. Then, by copolymerizing the monomer in the present invention at a specific ratio, a high glass transition point can be obtained, and the degree of freedom of molecular bending in the fluorine-containing copolymer is suppressed, so that crosslinking within the same molecule can be achieved. The access between the functional groups is suppressed, the cross-linking reaction between different molecules is promoted, and a uniform cured state is formed. As a result, it is considered that prevention of blocking and good appearance and physical properties of the coating film can be achieved at the same time.
- monomer (B) and monomer (E) do not bind to the main chain of the copolymer!
- the effect of suppressing the degree of freedom of the main chain is higher than the length of the alkyl chain is longer. Substitution reactions are less likely to occur than those with a cyclic alkyl chain.
- the monomer (A) is chlorofluoroethylene
- the above-mentioned alternating copolymer structure allows the monomer (C) to be appropriately distributed within the copolymer molecule, and during the crosslinking reaction.
- the network structure becomes more uniform. Therefore, the contribution of monomer (B) to the effect of the present invention is considered to be large.
- the appearance and flexibility of the coating film are further improved by using the monomer (B) which is a bull ether and the (E) which is a bull ester.
- the reason for this is unknown in detail. It is thought that the bulky side chain functional groups can be easily oriented by changing the distance between the main chain forces of the force side chains.
- the number average molecular weight of the fluorinated copolymer is a value determined in terms of polystyrene by the gel permeation mouth matography method (GPC).
- the xylene solution of the fluorine-containing copolymer thus obtained was evaporated in a thin film and dried until the solid content was 99% by mass or more.
- the thus obtained fluorine-containing copolymer (1) has a glass transition point (Tg) of 54 ° C by a differential calorimeter (DSC), and a number average molecular weight (Mn) of 18,18 by chromatograph (GPC). 000.
- Table 1 below shows the proportion of each monomer used for the synthesis of the fluorinated copolymer (unit: mol%), and the measurement of the number average molecular weight and glass transition temperature of the obtained fluorinated copolymer. Show the results (the same applies below) o
- the monomer mixture was changed to a mixture of 10.4 g of t-BuVE, 38.5 g of vinyl bivalinate (VPV), and 13.2 g of HBVE.
- the amount of xylene used was changed to 55.5 g, and the amount of ethanol used was changed to 15.7 g.
- the amount of CTFE used was changed to 63g.
- a fluorine-containing copolymer was produced without using the monomer (B). That is, in Production Example 1, Force using tert butyl ether as monomer (B) and ethyl butyl ether as monomer (D) In this example, these are not used, and cyclohexyl vinyl ether as monomer (D) (CHVE) was used.
- the monomer mixture was changed to a mixture of 13.3 g of HBVE and 51.2 g of cyclohexyl vinyl ether (CHVE).
- CHVE cyclohexyl vinyl ether
- the amount of xylene used was changed to 55.8 g, and the amount of ethanol used was changed to 15.7 g.
- the amount of CTFE used was changed to 63g.
- a fluorine-containing copolymer was produced without using the monomer (B). That is, in Production Example 1, tert butyl vinyl ether was used as monomer (B), and ethyl butyl ether was used as monomer (D). ) Cyclohexyl vinyl ether (CHVE) and 2-ethylhexyl vinyl ether (2EHVE).
- the monomer mixture is a mixture of 9.6 g of HBVE, 24 g of cyclohexyl vinyl ether (CHVE), and 22 g of 2 ethyl hexyl vinyl ether (2E HVE). Changed to
- the amount of xylene used was changed to 66.5 g, and the amount of ethanol used was changed to 18.8 g.
- a fluorine-containing copolymer was produced without using the monomer (B). That is, the power of using tert butyl vinyl ether as the monomer (B) in Production Example 1 does not use these in this example, but as the monomer (E) bivalerate bullate (VPV) and other monomers 2-Metoxipropene (2MP) was used. Specifically, in Production Example 1, the monomer mixture was made up of 12.4 g of HBVE, 3.8 g of ethyl vinyl ether (EVE), 7.7 g of 2-ethoxypropene (2MP), and bivalin. Changed to a mixture of 34.2 g of vinyl acid (VPV).
- the amount of xylene used was changed to 57.2 g and the amount of ethanol used was changed to 16. lg.
- the amount of CTFE used was changed to 64.6g.
- the monomer mixture was changed to a mixture of 3.lg of t-BuVE, 4.5g of EVE, 12.lg of HBVE, and 41.5g of VPV.
- the amount of xylene used was changed to 56 g
- the amount of ethanol used was changed to 15.8 g.
- the amount of CTFE used was changed to 63.2 g.
- Powder coating compositions (1) to (3) using the fluorinated copolymers (1) to (3), (5) and (6) obtained in the above production examples 1 to 3, 5 and 6, respectively. (5) and (6) were produced. That is, 116 g of fluorine-containing copolymer, 28 g (INDEX l) of curing agent (Dedasa Co., Ltd., trade name: Vestagon B15 30), 0.8 g of benzoin, surface conditioner (Bikchemi Co., Ltd., trade name: By using a high-speed mixer, 2 g of BYK-360P), 0.0039 g of dibutyltin dilaurate as an additive, and 70 g of titanium dioxide (made by DuPont, trade name: Taipure R960) as a colorant, Each component was mixed in a powder state.
- the obtained mixture was melt kneaded at a barrel setting temperature of 120 ° C. using a twin-screw extruder (manufactured by Thermo Prism, 16 mm extruder) to obtain coating composition pellets.
- the obtained pellets are pulverized at room temperature using a pulverizer and classified with a mesh to obtain powder coating compositions (1) to (3), (5) and (6) having an average particle diameter of about 40 m. It was.
- the average particle size in the above examples and comparative examples is a laser diffraction particle size distribution analyzer.
- Each of the powder coating compositions obtained in the above Examples and Comparative Examples was used for static treatment using an electrostatic coating machine (trade name: GX360 0C, manufactured by Onoda Cement Co., Ltd.) on one side of an aluminum plate that had been chromated. Electrocoating was carried out and held in an atmosphere of 200 ° C for 20 minutes, and then cooled to obtain a coated plate having a coating film thickness of 55 to 65 ⁇ m.
- an electrostatic coating machine trade name: GX360 0C, manufactured by Onoda Cement Co., Ltd.
- the test was performed in accordance with JIS K5600-5-3. Using a DuPont impact deformation tester, a 6.35 mm radius shooting type, cradle, and a weight of 500 g, drop the weight on the painted surface of the test piece, and cracking and peeling will occur due to deformation due to impact. The highest possible weight drop height (unit: cm) was measured.
- the test was performed in accordance with JIS K5600-5-4. The hardness of the hardest pencil that did not cause scratches was measured.
- the gloss (60 degrees and 20 degrees) of the painted surface was measured by a test method based on JIS K5600-4-7. The larger the value! / ⁇ , the better the gloss.
- the powder coating composition of the present invention can be used as a powder coating at room temperature without problems, and can achieve both a good coating film appearance and flexibility. It can be used for road construction materials such as railings, gates, fences, siding materials for houses, automobile bodies and parts, and home appliances. It should be noted that the entire contents of the specification, claims, and abstract of Japanese Patent Application No. 2006-132503 filed on May 11, 2006 are cited herein as the disclosure of the specification of the present invention. It is something that is incorporated.
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- Wood Science & Technology (AREA)
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Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2007250968A AU2007250968B2 (en) | 2006-05-11 | 2007-05-10 | Powder coating composition |
| CN2007800160687A CN101437910B (zh) | 2006-05-11 | 2007-05-10 | 粉体涂料组合物 |
| JP2008515515A JP5151978B2 (ja) | 2006-05-11 | 2007-05-10 | 粉体塗料組成物 |
| EP07743116A EP2017312B1 (en) | 2006-05-11 | 2007-05-10 | Powder coating composition |
| US12/248,923 US7652110B2 (en) | 2006-05-11 | 2008-10-10 | Powder coating composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-132503 | 2006-05-11 | ||
| JP2006132503 | 2006-05-11 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/248,923 Continuation US7652110B2 (en) | 2006-05-11 | 2008-10-10 | Powder coating composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007132736A1 true WO2007132736A1 (ja) | 2007-11-22 |
Family
ID=38693830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/059681 Ceased WO2007132736A1 (ja) | 2006-05-11 | 2007-05-10 | 粉体塗料組成物 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7652110B2 (ja) |
| EP (1) | EP2017312B1 (ja) |
| JP (1) | JP5151978B2 (ja) |
| CN (1) | CN101437910B (ja) |
| AU (1) | AU2007250968B2 (ja) |
| WO (1) | WO2007132736A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016068255A1 (ja) * | 2014-10-31 | 2016-05-06 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
| JP2016113535A (ja) * | 2014-12-15 | 2016-06-23 | 旭硝子株式会社 | 塗料用組成物および塗装物品 |
| WO2016139966A1 (ja) * | 2015-03-02 | 2016-09-09 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942262B (zh) * | 2010-08-30 | 2013-04-03 | 杜邦华佳化工有限公司 | 具有高表面硬度和装饰性的粉末涂料 |
| EP3029117B1 (en) * | 2013-07-29 | 2018-03-07 | Asahi Glass Company, Limited | Powder coating material, coated article, and processes for their production |
| EP3060590B1 (en) * | 2013-10-22 | 2020-03-04 | Honeywell International Inc. | Curable fluorocopolymer formed from tetrafluoropropene |
| JP6631533B2 (ja) * | 2014-11-17 | 2020-01-15 | Agc株式会社 | 粉体塗料用フルオロオレフィン共重合体粉末の製造方法、粉体塗料用組成物、粉体塗料および塗装物品 |
| JP6298198B1 (ja) * | 2017-05-26 | 2018-03-20 | 関西ペイント株式会社 | 粉体塗料組成物 |
| CN117003925A (zh) * | 2023-08-08 | 2023-11-07 | 上海华谊三爱富新材料有限公司 | 含氟共聚物及其制备方法和用途 |
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- 2007-05-10 EP EP07743116A patent/EP2017312B1/en not_active Not-in-force
- 2007-05-10 CN CN2007800160687A patent/CN101437910B/zh active Active
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| WO2016068255A1 (ja) * | 2014-10-31 | 2016-05-06 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
| JPWO2016068255A1 (ja) * | 2014-10-31 | 2017-09-14 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
| JP2016113535A (ja) * | 2014-12-15 | 2016-06-23 | 旭硝子株式会社 | 塗料用組成物および塗装物品 |
| WO2016139966A1 (ja) * | 2015-03-02 | 2016-09-09 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
| JPWO2016139966A1 (ja) * | 2015-03-02 | 2018-01-18 | 旭硝子株式会社 | 粉体塗料用組成物、粉体塗料および塗装物品 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101437910B (zh) | 2012-08-08 |
| CN101437910A (zh) | 2009-05-20 |
| US20090043062A1 (en) | 2009-02-12 |
| AU2007250968A1 (en) | 2007-11-22 |
| EP2017312A1 (en) | 2009-01-21 |
| US7652110B2 (en) | 2010-01-26 |
| EP2017312A4 (en) | 2010-06-23 |
| AU2007250968B2 (en) | 2012-07-12 |
| JP5151978B2 (ja) | 2013-02-27 |
| JPWO2007132736A1 (ja) | 2009-09-24 |
| EP2017312B1 (en) | 2012-08-29 |
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