WO2005061639A1 - 熱硬化性粉体塗料組成物 - Google Patents
熱硬化性粉体塗料組成物 Download PDFInfo
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- WO2005061639A1 WO2005061639A1 PCT/JP2004/018619 JP2004018619W WO2005061639A1 WO 2005061639 A1 WO2005061639 A1 WO 2005061639A1 JP 2004018619 W JP2004018619 W JP 2004018619W WO 2005061639 A1 WO2005061639 A1 WO 2005061639A1
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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
- C09D5/033—Powdery paints characterised by the additives
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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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
Definitions
- the present invention relates to a thermosetting powder coating composition capable of forming a film having excellent low-temperature curability, excellent storage stability, and excellent properties such as acid resistance.
- thermosetting powder coating compositions are widely used in all metal coatings as environmentally friendly coatings that do not evaporate organic solvents into the atmosphere during coating.
- thermosetting powder coating compositions in the form of epoxy group-containing butyl polymer or polyester resin as a resin component can form films with excellent physical properties such as workability and solvent resistance. Because of this, demand is growing rapidly.
- Powerful thermosetting powder coating compositions do not contain organic solvents, and thus can be said to be the best coating compositions from the viewpoint of VOC reduction and reduction. Compared with the solvent-based paint, a high baking temperature is required for crosslinking and curing the paint composition, which is a problem in terms of energy saving and reduction in energy cost.
- thermosetting powder coating composition since there is a problem that it is difficult to apply to a member that is relatively weak to heat, such as plastic or wood, or a member that does not easily rise in temperature, the baking temperature of the thermosetting powder coating composition is high. It is an urgent task to lower the temperature of
- thermosetting powder coating compositions include combinations of a hydroxyl group-containing polyester and a block isocyanate, combinations of an acid group-containing polyester and an epoxy compound, A combination of an acid group-containing polyester and triglycidyl isocyanurate, a combination of an epoxy group-containing bull polymer and a dibasic acid, and the like are used, and a thermosetting powder coating composition using the same is used.
- the baking condition is generally about 180 ° C.
- the baking temperature must be 140 ° C or higher even for epoxy-containing vinyl polymers and dibasic acids that can be cured at relatively low temperatures.
- thermosetting solvent-based paints are generally used under drying and baking conditions of 120 ° C or lower as long as they are excellent in low-temperature curability, such as an amino resin-curable type. did Therefore, in order to replace the current thermosetting solvent-based paint with a thermosetting powder coating composition at the line side in the industry, the baking furnace must be set at a higher temperature than the existing baking conditions Therefore, the necessity of baking at a high temperature of the thermosetting powder coating composition is an obstacle to replacing the thermosetting powder coating composition with an environment-friendly thermosetting powder coating composition.
- thermosetting powder coating composition As a method of lowering the baking temperature of the thermosetting powder coating composition, use of a curing agent excellent in low-temperature curability, such as an amino resin, or use of a highly active catalyst can be considered. Insufficient heat resistance or solid phase reaction promotes the blocking resistance of the thermosetting powder coating composition during storage, causing a problem in storage stability. Can not be offered.
- a powder coating resin composition containing a resin comprising a copolymer having both a carboxylic acid alkyl ester group and a hydroxyl group, and a transesterification catalyst such as tetraisopropyl titanate or paratoluenesulfonic acid as a curing catalyst.
- a transesterification catalyst such as tetraisopropyl titanate or paratoluenesulfonic acid as a curing catalyst.
- Things are known (for example, see Patent Document 2).
- an ester exchange reaction between a carboxylic acid alkyl ester group and a hydroxyl group is used for a crosslinking curing reaction, but a baking temperature of 180 ° C. is required.
- thermosetting powder coating compositions have not been conducted, but diphenylammonium obtained using diphenylammonium and trifluoromethanesulfonic acid as a curing system capable of being cured at low temperatures.
- Triflate Esterification of monohydric alcohols such as ⁇ -octanol with monovalent acids such as 3-phenylpropionic acid, and transesterification between monoesters such as methyl 3-phenylpropionate and monohydric alcohols It has been reported that the method has an effect of improving the reactivity under relatively low temperature conditions of 80 to 110 ° C (for example, Non-Patent Document 1).
- Patent Document 1 JP-A-9-187552
- Patent Document 2 JP-A-8-92503
- Non-patent Document 1 Tetrahedron Letters (2000), 41 (27), 5249-5252 Disclosure of the Invention
- Non-Patent Document 1 discloses the curing reaction of a compound having a large number of reactive functional groups, such as a resin used in a thermosetting powder coating composition, and knowledge of a thermosetting powder coating composition. Not listed at all.
- thermosetting powder coating composition As described above, even if an attempt is made to improve the thermosetting powder coating composition by making full use of conventional techniques to improve the low-temperature curing, storage stability such as blocking resistance is sacrificed. Thus, there was no practical product. That is, a high-temperature baking furnace was required for cross-linking and hardening the conventional practically available thermosetting powder coating compositions which did not cure sufficiently at low temperatures.
- thermosetting powder coating composition is difficult to use for components that are relatively weak to heat, such as plastic and wood, and for components that do not easily rise in temperature. It has been difficult to replace existing thermosetting solvent-based paints in the coating line.
- An object of the present invention is to provide a thermosetting powder coating composition which is particularly excellent in low-temperature curability and storage stability such as blocking resistance.
- Another object of the present invention is to provide, in addition to the above-mentioned excellent low-temperature curability and storage stability, a thermosetting property capable of forming a film having excellent hardness, solvent resistance, acid resistance, and bending resistance.
- An object of the present invention is to provide a powder coating composition.
- the present inventors have studied a curing system excellent in low-temperature curability on the assumption that the composition can be applied to a thermosetting powder coating composition that requires essentially good storage stability.
- the organic sulfonate formed from the carboxylic acid amide compound and the organic sulfonic acid having a fluorine atom has a function of significantly promoting the transesterification reaction between the hydroxyl group and the carboxylic ester group, and It was found that coloring and curing of the cured product did not cause any problems.
- thermosetting powder coating composition having excellent storage stability such as blocking resistance can be obtained. And found that a film can be formed by crosslinking and curing at a much lower temperature than conventional thermosetting powder coating compositions.
- thermosetting powder coating composition formed by crosslinking and curing the obtained thermosetting powder coating composition under low-temperature conditions has a good appearance, hardness, solvent resistance, acid resistance, and bending resistance.
- the present invention has been completed by confirming that the general properties required for the thermosetting powder coating composition such as heat resistance are also good.
- the present invention relates to a thermosetting powder coating composition containing a film-forming component capable of undergoing a cross-linking reaction by transesterification between a carboxylic acid ester group and a hydroxyl group, and a transesterification catalyst.
- the transesterification catalyst is composed of an organic sulfonic acid salt (X) formed from a carboxylic acid amide and an organic sulfonic acid having a fluorine atom, thereby providing a thermosetting powder coating composition. Things.
- thermosetting powder coating composition having the structure represented by the above-mentioned organic sulfonate (X) 1 represented by the following general formula (IV). is there. [0022] [Formula 1] oo R l
- R1, R2 and R3 each independently represent a hydrogen atom or a monovalent organic group. Further, R2 and R3 may be mutually bonded to form a divalent group represented by the general formula ( ⁇ ).
- R4 represents a hydrogen atom or a methyl group
- Y represents any of a direct bond, a methylene group, a substituted methylene group, and an oxygen atom.
- R1 and R2 may be mutually bonded to form a substituted or unsubstituted alkylene group having a total of 211 carbon atoms.
- R5 represents a monovalent organic group having a fluorine atom.
- thermosetting powder coating composition which is particularly excellent in low-temperature curability and storage stability such as blocking resistance.
- thermosetting powder coating composition of the present invention can set cross-linking curing conditions at a much lower temperature than in the past, and can greatly reduce energy costs in the manufacturing process. .
- thermosetting powder coating composition of the present invention cannot be applied with the conventional thermosetting powder coating composition. It can be used for members, and the application range of the environmentally friendly thermosetting powder coating composition can be greatly expanded.
- thermosetting solvent-based paint in a coating line operating in the industry, can be replaced with an environmentally friendly thermosetting powder coating composition. It can be expected to be accelerated.
- a polymer such as a vinyl polymer having two or more hydroxyl groups and / or two or more sulfonic acid ester groups in one molecule, a polyester resin, or a urethane resin is used as an essential component.
- a low molecular weight compound can be used in combination as appropriate.
- the number average molecular weight of the polymer used as such a film-forming component is from 1,000 to 300.
- It is preferably in the range of 00, more preferably in the range of 2000-10000, and particularly preferably in the range of 2000-15000.
- the film forming component is a polymer having a number average molecular weight in the range of 1000 to 30000, more preferably 90% by weight or more.
- thermosetting powder coating composition has excellent storage stability such as blocking resistance. And a coating excellent in hardness, solvent resistance, acid resistance, bending resistance and the like can be formed. Further, the curability and workability of the thermosetting powder coating composition are improved.
- the softening point of the film-forming component used in the present invention is preferably in the range of 50 to 130 ° C, more preferably in the range of 90 to 120 ° C. Within the softening point range If so, the resulting thermosetting powder coating composition has good storage stability and good fluidity in a molten state, and can form a film having excellent smoothness.
- the compound (A) having two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule which can be used as the forming component, A compound having two or more hydroxyl groups and no carboxylic ester group (B), a compound having two or more carboxylic ester groups in one molecule and having no hydroxyl group, and a compound (C) The ability to raise S is possible.
- the compound (A) having two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule has, for example, a number average molecular weight in the range of 1,000 to 30,000, and A polymer (a-1) having both two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule, and having a number average molecular weight of less than 1000 and two or more in one molecule
- a low-molecular compound (a-2) having both a hydroxyl group and two or more carboxylic acid ester groups can be used.
- Specific examples of the compound usable as the polymer (a-1) include a compound having a number average molecular weight in the range of 1,000 to 30,000, and each having two or more hydroxyl groups and two or more hydroxyl groups in one molecule.
- Examples include a bur polymer, a polyester resin, a polyurethane resin, and the like, which also have a rubonic ester group.
- the use of a vinyl polymer enables formation of a coating film that is particularly excellent in acid resistance.
- the vinyl polymer having two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule includes two or more hydroxyl groups and two or more hydroxyl groups in one molecule, respectively.
- Acrylic polymer, vinyl ester polymer, ⁇ -olefin polymer, fluoroolefin polymer, aromatic vinyl polymer, etc. Polymers are preferred.
- a vinyl polymer having two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule has a vinyl monomer having a hydroxyl group and a carboxylic acid ester group.
- a butyl monomer as an essential monomer, and optionally using a butyl monomer having no other hydroxyl group and carboxylate group copolymerizable with these monomers, It can be produced by applying various known and commonly used methods.
- the ability to produce a target vinyl polymer by radical polymerization, ionic polymerization, or photopolymerization is a force capable of producing S. It is convenient to use S, especially a solution radical polymerization method.
- the obtained bull-based polymer is used in a solid state when the thermosetting powder coating composition of the present invention is produced by removing the solvent as necessary.
- vinyl monomers having a hydroxyl group which are widely used those having a carboxylic acid ester group in addition are often used as a hydroxyl group and a carboxylic acid ester group.
- a vinyl monomer having both even if it is homopolymerized, the vinyl having both two or more hydroxyl groups and two or more carboxylic acid ester groups in one molecule of the intended molecule can be obtained. Based polymer can be produced.
- those having no carboxylic ester group include N-methylol (meth) acrylamide, 2-hydroxyethylbutyl ether, 4-hydroxybutyl vinyl ether, —Hydroxyethylaryl ether can be used.
- Examples of usable vinyl monomers having both a hydroxyl group and a carboxylic acid ester group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxypropyl (meth) acrylate. —Hydroxybutyl (meth) acrylate, ethyl- ⁇ -hydroxymethyl acrylate, and the like. Further, vinyl monomers having a hydroxyl group obtained by reacting these various hydroxyl group-containing vial monomers with ⁇ -caprolataton can also be used.
- Examples of the vinyl monomer having a carboxylic acid ester group that can be used include, in addition to the above-mentioned vinyl monomer having both a hydroxyl group and a carboxylic acid ester group, methyl (meth) Various alkyl groups with 1 to 22 carbon atoms, such as acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and lauryl (meth) acrylate Alkyl (meth) acrylates of
- alicyclic alkyl (meth) acrylates such as cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, and the like;
- Halogen-substituted alkyl (meth) acrylates such as 2,2-fluoroethyl (meth) acrylate, 2,2-difluoroethyl (meth) acrylate, and 2,2,2-trifluoroethyl (meth) acrylate ;
- Various alkyl esters of crotonic acid such as methyl crotonate and ethyl crotonate;
- Various alkyl esters of crotonic acid such as dimethyl malate, dibutyl malate, dimethyl fumarate, dibutyl fumarate, dimethyl itaconate and dibutyl itaconate.
- Dialkyl esters of saturated dicarboxylic acids
- Carboxynole group-containing monomer which is an addition reaction product of a hydroxyl group-containing monomer such as 2-hydroxyethyl (meth) acrylate and various acid anhydrides such as succinic anhydride and phthalic anhydride. And various monomers having an acid group other than a carboxyl group, such as 2-phosphoryloxetyl (meth) acrylate.
- Aromatic vinyl monomers such as styrene, styrene, p_tert-butylstyrene, permethylstyrene, and butanolene;
- Various (meth) acrylamides such as (meth) atalinoleamide, N, N-dimethyl (meth) atalinoleamide and N-butoxymethyl (meth) acrylamide; (meth) acrylonitrile and crotononitrile Any of various cyano group-containing vinyl monomers;
- haloolefins such as biel fluoride, vinylidene fluoride, tetrafluoroethylene, chlorofluoroethylene, hexafluoropropylene, vinyl chloride, and vinylidene chloride;
- Various phosphoryls such as ethylene, propylene, isobutylene, and 1-butene; various unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid; and acid groups other than carboxynole groups such as bursulfonic acid.
- Various monomers having:
- alkylbutyl ethers such as ethylbutyl ether, n -butylbutyl ether, isobutylbutyl ether and cyclohexyl vinyl ether.
- a polyester resin having both a polycarboxylic acid and a polyhydric alcohol as described below are used in such a ratio that the hydroxyl group of the polyhydric alcohol becomes excessive with respect to the carboxy group of the polyhydric carboxylic acid.
- a product obtained by condensation by a known method can be used.
- usable polyvalent carboxylic acids include aliphatic dibasic acids such as oxalic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecane diacid, and eicosane diacid; terephthalic acid Aromatic dicanolevonic acids such as acid, isophthalic acid, orthophthalic acid, and 2,6-naphthalenedicarboxylic acid; 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, hexahydrophthalic anhydride, tetrahydro Alicyclic dicarboxylic acids such as phthalic anhydride; unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid; tri- or higher-functional carboxylic acids such as trimellitic acid and pyromellitic acid; and P-oxybenzoic acid And hydroxycarboxylic acids such as
- polyhydric alcohol examples include ethylene glycol, 1,3-propylene glycolone, 1,2-propylene glycolone, 2-methionone-1,3-propylene glycolone, 1,2-propylene glycolone.
- the urethane resin will be described.
- the polyurethane resin can be manufactured by applying a known method for manufacturing a polyurethane resin.
- a polyol such as an acrylic polyol or a polyester polyol having two or more carboxylic acid ester groups and a polyisocyanate are mixed with each other so that the hydroxyl group of the polyol is excessive relative to the isocyanate group of the polyisocyanate.
- the polyurethane resin can be obtained by reacting under the following conditions.
- Examples of the polyisocyanate usable in this case include diphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, triphenylmethane triisocyanate and hydrogenated products thereof.
- polyisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, isophorone diisocyanate, and lysine diisocyanate.
- the number of hydroxyl groups and carboxylic acid ester groups of the polymer (a-1) depends on the balance between the curability and stability of the resulting thermosetting powder coating composition. — 1) The total amount of the hydroxyl group and the carboxylic acid ester group per 1000 grams is preferably in the range of 0.1 mol to 8.6 mol, and more preferably in the range of 0.3 mol.
- the polymer (a-1) used in the present invention is a polymer having both two or more hydroxyl groups and two or more sulfonic acid ester groups in one molecule.
- the polymer (a-1) produced by a known method usually contains a compound having one hydroxyl group and / or one carbonate group in one molecule.
- the main component is a compound having at least two hydroxyl groups and two or more carboxylic acid ester groups, the object of the present invention can be achieved without any problem.
- the thermosetting powder coating composition of the present invention has a number-average molecular weight of less than 1000 in addition to the polymer (a-1) described above, and has two or more hydroxyl groups in one molecule.
- a low molecular compound (a-2) having two or more carboxylic acid ester groups can also be used in combination.
- Examples of the low molecular weight compound (a-2) that can be used include dihydroxyalkane dicarboxylic acid diesters such as dimethyl dihydroxymalonate and getyl dihydroxymalonate; and dihydroxyalkane dicarboxylic acid diesters such as dimethyl dihydroxyfumarate and getyl dihydroxyfumarate.
- Examples include dihydroxy aromatic dicarboxylic acid diesters such as getyl acetate.
- diesters of various dihydroxydicarboxylic acids and alkanols such as dihydroxyalkanedicarboxylic acid, dihydroxyalkenedicarboxylic acid, and dihydroxyaromatic dicarboxylic acid.
- diesters of these dihydroxydicarboxylic acids and various substituted alkynols can also be used.
- Examples of strong substituted alkynols include various alkynol-substituted alkynols such as 2-methoxyethanol, 2-methoxypropanol, and 3-methoxypropanol; 2-chloroethanol, 2-fluoroethanol, Various halogen-substituted alcohols such as 2,2,2-trifluoroethanol; and various carboxylic acid ester-substituted alcohols such as methyl glycolate, ethyl lactate, methyl hydroxypropionate, and dimethyl malate. And the like, and can be used within a range that does not impair the storage stability (blocking resistance) of the obtained thermosetting powder coating composition.
- the compound (B) for example, a polymer (bl) having a number average molecular weight in the range of 1,000 to 30,000, having two or more hydroxyl groups in one molecule, and not having a carboxylic acid ester group ), And a low-molecular compound (b) having a number average molecular weight of less than 1000, having at least two hydroxyl groups in one molecule, and not having a carboxylic ester group. -2) can be used.
- the polymer (b-1) that can be used as the compound (B) includes 10
- It has a number average molecular weight in the range of 00 to 30,000, has two or more hydroxyl groups in one molecule, has no carboxylate ester group, butyl polymer, polyurethane resin, polyether resin, etc. Is mentioned.
- the vinyl polymer which can be used as the polymer (b_l) can be obtained by homopolymerizing a vinyl monomer having a hydroxyl group and not having a carboxylic ester group, or It can be obtained by copolymerizing the compound with a vinyl monomer having no other hydroxyl group and carboxylic acid ester group copolymerizable therewith.
- the vinyl monomers having a hydroxyl group and no carboxylate group that can be used at this time include cyclohexyl vinyl ether, N-methylol (meth) acrylamide, and 2-hydroxy Echinolebininoleatenore, 4-hydroxybutinolebininoleatenole, 2-hydroxyxethylaryl ether and the like.
- a vinyl-based polymer usable as the compound (B) using these vinyl-based monomers a vinyl-based polymer as the polymer (a-1) is produced.
- a known and commonly used polymerization method can be applied, and the solution radical polymerization method is the simplest.
- the obtained bull-based polymer is used in a solid state when the thermosetting powder coating composition of the present invention is produced by removing the solvent as necessary.
- the polymer (b-1) other than a vinyl polymer such as a polyurethane resin or a polyether resin, which can be used as the compound (B) described above, is obtained by a known method such as a solution reaction method and a solid phase reaction method. However, when a solvent is used, when the solvent is removed, when the thermosetting powder coating composition of the present invention is produced, the obtained polymer is a solid. Use in the state of a thing. [0084] It can be used as the polymer (b-1), has a number average molecular weight in the range of 1,000 to 30,000, has two or more hydroxyl groups in one molecule, and has a carboxylic acid ester group.
- the polyurethane resin can be produced by various known methods.
- a polyisocyanate for example, it can be obtained by reacting a polyisocyanate with a compound having at least two hydroxyl groups in one molecule in such a ratio that the number of hydroxyl groups of the compound becomes excessive with respect to the number of isocyanate groups of the polyisocyanate. Things can be used.
- Examples of the polyisocyanate that can be used at that time include the polyisocyanates exemplified as those that can be used when obtaining the above-mentioned polyurethane resin as the polymer (a-1).
- the compound having at least two hydroxyl groups in one molecule which can be used in producing the polyurethane resin, can be used to obtain the polyester resin as the polymer (a-1).
- the polymer (a-1) polymer having at least two hydroxyl groups in one molecule and not having a carboxylic ester group, and polymers may be mentioned.
- Examples of the polyether resin usable as the above-mentioned polymer (b-1) include polyethylene glycol and polypropylene daricol having a number average molecular weight in the range of 1,000 to 30,000.
- a polymer having a number average molecular weight in the range of 1,000 to 30,000, having two or more hydroxyl groups in one molecule, and having no carboxylate group (b-1) The amount of the hydroxyl group contained in the compound is preferably in the range where the hydroxyl value is in the range of 10 to 400, and more preferably in the range of 20 to 300.
- thermosetting powder coating composition of the present invention has a number average molecular weight of less than 1000 and two or more hydroxyl groups in one molecule, in addition to the polymer (b_l) described above.
- a low molecular compound (b_2) having no carboxylic acid ester group can also be used in combination.
- Examples of the low molecular weight compound (b-2) include various alkanediols such as ethylene glycol, propylene glycol, butanediol, hexanediol, and dodecanediol; various cycloalkanes such as cyclohexanediol and methylhexanediol.
- alkanediols such as ethylene glycol, propylene glycol, butanediol, hexanediol, and dodecanediol
- various cycloalkanes such as cyclohexanediol and methylhexanediol.
- Various triols represented by trimethylolpropane; diols and triols Can be used in a range that does not impair the storage stability (blocking resistance) of the obtained thermosetting powder coating composition.
- the compound (C) has two or more carboxylic acid ester groups in one molecule and does not have a hydroxyl group, which can be used as a film forming component constituting the thermosetting powder coating composition of the present invention.
- the compound (C) will be described.
- the compound (C) for example, a polymer (c_l) having a number average molecular weight in the range of 1,000 to 30,000, having two or more carboxylic acid ester groups in one molecule, and having no hydroxyl group And a polycarboxylic acid ester conjugate (c_2) having a number average molecular weight of less than 1000 and having no hydroxyl group.
- the polymer (c_l) has a number-average molecular weight in the range of 1000 to 30000, has two or more carboxylic acid ester groups in one molecule, and has no hydroxyl group.
- Polyester resin and the like can be used.
- the vinyl polymer has a carboxylic acid ester group and is capable of homopolymerizing a vinyl monomer having no hydroxyl group, or is capable of copolymerizing the monomer with the vinyl monomer. It can be obtained by copolymerizing with a vinyl monomer having no hydroxyl group or carboxylic ester group.
- the butyl monomer having a carboxylic acid ester group and not having a hydroxyl group includes those usable in producing a vinyl polymer as the polymer (a-1).
- Bull-based monomers having a carboxylic acid ester group other than the above-mentioned bullet-based monomers having both a hydroxyl group and a carboxylic acid ester group can be used.
- Examples of the various types of vinyl monomers and other copolymerizable vinyl monomers having no hydroxyl group or carboxylic acid ester group include vinyl monomers as the polymer (a-1).
- Other butyl monomers having no hydroxyl group and no carboxylic acid ester group, which can be used for producing the polymer, can be used.
- a vinyl-based polymer as the polymer (a-1) is produced.
- a known and commonly used polymerization method can be applied, and the solution radical polymerization method is the simplest.
- the obtained bull-based polymer may be subjected to removal of a solvent, if necessary, to give the thermosetting powder of the present invention.
- the body coating composition is produced, it is used in a solid state.
- the polymer (c1) has a number average molecular weight in the range of 1,000 to 30,000, has two or more carboxylic acid ester groups in one molecule, and has a hydroxyl group.
- No polyester resin contains polycarboxylic acid and polyhydric alcohol, so that the carboxyl group of the polycarboxylic acid becomes excessive with respect to the hydroxyl group of the polyhydric alcohol so that the hydroxyl group does not remain in the obtained polyester resin. What is obtained by condensing by a well-known method using such a ratio can be used.
- the polycarboxylic acid or polyhydric alcohol the polyhydric carboxylic acids or polyhydric alcohols which have already been exemplified as those usable for producing the polyester resin as the polymer (a-1) are used. Acids and polyhydric alcohols can be used.
- the content of the group is preferably in the range of 0.2 to 12.0 moles per 1,000 g of the polymer, more preferably 0.4 to 10 moles.
- thermosetting powder coating composition of the present invention contains, in addition to the polymer (c-1) described above, a polyvalent carboxylic acid having a number average molecular weight of less than 1000 and having no hydroxyl group.
- the ester compound (c2) can be used together.
- Examples of powerful polycarboxylic acid ester compounds (c_2) include various alkanes such as dimethyl oxalate, getyl oxalate, dimethyl malonate, getyl malonate, dimethyl succinate, dimethyl adipate and dimethyl sebacate.
- Dicarboxylic acid alkyl esters include various polycarboxylic acid alkyl esters such as trimethyl tributyrate and tetramethyl butanetetracarboxylate; various alkylene dicarboxylic acid alkyl esters such as dimethyl maleate and dimethyl phthalate; dimethyl phthalate Alkyl esters of aryl dicarboxylic acids such as dimethyl terephthalate, dibutyl phthalate, dibutyl phthalate, dimethyl isophthalate, dimethyl terephthalate, dibutyl terephthalate; trimethyl trimellitate, tetramethyl pyromellitate Examples include various aryl polycarboxylates such as steles.
- alkyl esters obtained from various polycarboxylic acids, alkanols, and the like. However, in addition to these, it is possible to use an ester of various polycarboxylic acids and substituted alcohols.
- Substituted alkynols that can be used in this case include various alkoxy-substituted alkynols such as 2-methoxyethanol, 2-methoxypropanol, and 3-methoxypropanol; 2-chloroethanol, 2_fluoro Various types of halogen-substituted alkanols such as roethanol and 2,2,2-trifluoroethanol; Various types of sulfonic acid esters such as methyl glycolate, ethyl ethyl lactate, methyl methyl hydroxypropionate, and dimethyl malate Examples thereof include Alkinol, and can be used within a range that does not impair the storage stability (blocking resistance) of the obtained thermosetting powder coating composition.
- an organic sulfonate (X) formed from a carboxylic acid amide and an organic sulfonic acid having a fluorine atom is used, and if necessary, another known catalyst can be used in combination.
- the strong organic sulfonate (X) is a transesterification reaction between the hydroxyl group and the carboxylic acid ester group of the film-forming component of the thermosetting powder coating composition of the present invention, which has already been described. Has the function of promoting
- the organic sulfonate (X) is a reaction product of a carboxylic acid amide compound and an organic sulfonic acid having a fluorine atom, and has a carboxylic acid amide group of the carboxylic acid amide compound and the fluorine atom.
- Examples of the carboxylic acid amide compound that can be used in producing the strong organic sulfonate (X) include a known compound having at least one carboxylic acid amide group in one molecule. Can be used. As a typical example, a compound represented by the following general formula (I) or a compound having two or more N-alkanoyl 2,2,6,6-tetramethylpyridin-1-yl groups in one molecule Compounds. [0108] [Formula 3]
- R1, R2, and R3 each independently represent a hydrogen atom or a monovalent organic group. Also
- R2 and R3 may be mutually bonded to form a divalent group represented by the general formula ( ⁇ ).
- R4 represents a hydrogen atom or a methyl group
- Y represents any of a direct bond, a methylene group, a substituted methylene group, and an oxygen atom.
- R1 and R2 may be bonded to each other to form a substituted or unsubstituted alkylene group having a total of 2 to 11 carbon atoms.
- Rl, R2, and R3 constituting the carboxylic acid amide compound represented by the general formula (I) specific examples include a substituted or unsubstituted alkyl having 1 to 20 carbon atoms.
- organic groups have a substituent
- substituents include a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, a cyano group, a hydroxyl group, an alkoxy group, a carboxyl group, and an alkoxycarbonyl group.
- atomic groups such as a carboxylic acid amide group and an aryloxycarbonyl group.
- divalent group represented by the general formula (II) examples include a tetramethylene group, a pentamethylene group, a 3-oxa1,5-pentylene group, a 1,1,4,4- Tetramethyltetramethylene, 1,1,5,5-tetramethylpentamethylene, 3-hydroxy-1,1,5,5-tetramethylpentamethylene, 3-methoxy-1,1,5,5-tetra Methylpentamethylene group, 3-acetoxy-1,1,5,5-tetramethylpentamethylene group, 3_propionyloxy-1,1,5,5-tetramethylpentamethylene group, 1,1,5, 5-Tetramethinole 3_oxa-11, 5_pentylene group and the like.
- unsubstituted alkylene group having a total of 211 carbon atoms include an ethylene group, a propylene group, a trimethylene group, a (1-methyl) trimethylene group, and a (2-methyl) trimethylene.
- substituted alkylene group having 2 to 11 total carbon atoms include a substituted ethylene group such as a cycloethylene group, a hydroxyethylene group, a carboxyethylene group, and a methoxycarbonylethylene group;
- a substituted propylene group such as a 2_carboxypropylene group, a 2-methoxycarbonylpropylene group, a 1-chloropropylene group, a 1-hydroxypropylene group, or a 1-methoxycarbonylpropylene group;
- trimethylene groups such as 1_carboxy) trimethylene, (1-methoxy) trimethylene group, (1-methoxycarbonyl) trimethylene group;
- Substituted pentamethylene groups such as a (1-chloro) pentamethylene group, a (2-cyano) pentamethylene group, a (1-methoxy) pentamethylene group, and a (1-methoxycarbonyl) pentamethylene group; [0122] (1-Chloro) pandecamethylene group, (2-cyano) pandecamethylene group, (1-hydroxy) pandecamethylene group, (1-carboxy) pandecamethylene, (2-carboxy) pandemethylen group, (1-methoxy) Substituted pendecamethylene groups such as pendecamethylene group, (1-methoxycarbonyl) pandemethylene group and (2-methoxycarbonyl) pandecamethylene group can be exemplified.
- substituted or unsubstituted alkylene groups having a total number of carbon atoms of 211 formed by bonding R1 and R2 to each other among the various substituted or unsubstituted trimethylene groups, Various substituted or unsubstituted pentamethylenes are preferred, and trimethylene groups and pentamethylene groups are more preferred.
- carboxylic acid amide compound forming the organic sulfonate (X) N-methyl_2_pyrrolidone is particularly preferable because the action of the organic sulfonate (X) as a curing catalyst is particularly excellent.
- N-alkanoyl 2,2,6,6-tetramethyl piberidis in one molecule which can be used as a carboxylic acid amide compound forming an organic sulfonate (X)
- the compound having a 4-yl group will be described.
- Representative examples of the alkynyl group contained in the powerful compound include an acetyl group, a propanol group, an isobutanol group, and a 2-ethylhexanoyl group.
- Specific examples of the compound having an N-2,2,6,6_tetramethylpiperidine-41-yl group having a strong alkanoyl group include bis (1-acetyl-2,2,6,6- Tetramethylpiperidine-1-41 adipate, bis (1-acetyl-2,2,6,6-tetramethylpiperidine-14-yl) sebasate, bis (1-propanoyl-2,2,6,6-) Tetramethylpiperidine-1-4-inole) adipate, bis (1-isobutanoyl 2,2,6,6-tetramethylpiperidine-14-yl) sebasate and the like.
- organic sulfonic acid having a fluorine atom refers to a compound having a sulfonic acid group bonded to an organic group having a fluorine atom as a substituent.
- organic sulfonic acid a monovalent acid or a divalent or higher acid can be used.
- the organic sulfonic acid is represented by the following general formula ( ⁇ ). Is a multivalent acid Is particularly preferred
- R5 represents a monovalent organic group having a fluorine atom.
- R5 that is a monovalent organic group having a fluorine atom and contained in the monovalent acid represented by the general formula ( ⁇ ) include a fluorine atom and a carbon atom number of 5 Examples include 120 anoquinone groups, cycloalkyl groups, cycloalkenyl groups, aralkyl groups, arylno groups, alkenyl groups, alkadienyl groups, and heterocyclic residues in which an oxygen atom or a sulfur atom forms part of a ring. A part or all of the hydrogen atoms contained in these organic groups may be substituted with fluorine atoms.
- R5 and R5 are the catalytic activities of organic sulfonates (X).
- R 6 represents a hydrogen atom, a fluorine atom, or a substituted or unsubstituted hydrocarbon group having 115 carbon atoms.
- R6 is a hydrocarbon group having a substituent
- examples of the substituent include a halogen atom such as a fluorine atom, a chlorine atom, and a bromine atom, a cyano group, an alkoxyl group, and an alkoxy group.
- the action of the organic sulfonate (X) as a curing catalyst is particularly excellent.
- trifluoromethanesulfonic acid which is preferably an alkanesulfonic acid having a fluorine atom at the 1-position, is preferred. Particularly preferred.
- the organic sulfonate (X) used in the present invention is formed from a carbonamide compound represented by the general formula (I) and an organic sulfonic acid having a fluorine atom represented by the general formula ( ⁇ ). And those having a structure represented by the following general formula (IV) are preferred. Among them, N_methinoleate 2_pyrrolidone'trifluoromethanesulfonate is most preferable because the action of the organic sulfonate (X) as a curing catalyst is particularly excellent.
- the resulting organic sulfonate (X) contains one of the above-mentioned general formula (IV) in one molecule.
- Salt structure When the carboxylic acid amide compound has two or more carboxylic acid amide groups, one molecule is contained in the obtained organic sulfonate (X) according to the use ratio of the carboxylic acid amide compound and the organic sulfonic acid.
- One or more salt structures contained in the above general formula (IV) are contained therein.
- the organic sulfonic acid salt (X) can be produced by reacting the above-mentioned carboxylic acid amide compound with an organic sulfonic acid having a fluorine atom.
- the molar ratio of the carboxylic acid amide group of the carboxylic acid amide compound to the sulfonic acid group of the organic sulfonic acid having a fluorine atom was such that
- a range of 1.5 is particularly preferred.
- reaction temperature is generally about 0 to 50 ° C, more preferably 0 ° C to room temperature.
- the reaction can be carried out using a solvent.
- a solvent that does not react with the organic sulfonate is preferable.
- the reaction may be carried out by adding organic sulfonic acid to the carboxylic acid amide or by adding the carboxylic acid amide to the organic sulfonic acid. Further, both components can be added to a solvent and reacted.
- reaction time may be about 10 minutes to several hours.
- the generated organic sulfonate (X) may be isolated by a generally used isolation method. In other words, if the organic sulfonate (X) is insoluble in the solvent and precipitates out, it can be filtered off. If the organic sulfonate (X) is dissolved in the solvent, the target can be obtained by the desolvation method or the precipitation method. An organic sulfonate (X) can be obtained. If necessary, the target salt can be purified by various methods such as a solvent washing method, a recrystallization method, and a reprecipitation method.
- thermosetting powder coating composition of the present invention [0146]
- specific mixing ratios of the respective film forming components and the organic sulfonate (X) constituting the thermosetting powder coating composition of the present invention will be described.
- thermosetting powder coating composition of the present invention contains two components of the compound (A) and the organic sulfonate (X), the compound (A) and the organic sulfonate (X)
- the mixing ratio of the organic sulfonate (X) is preferably in the range of 0.3 to 60 mmol per 100 g of the compound (A), more preferably in the range of 0.35 to 50 mmol. is there.
- thermosetting powder coating composition of the present invention contains three components of compound (B), compound (C) and organic sulfonate (X)
- the ratio of the equivalent of the hydroxyl group of compound (B) to the equivalent of the carboxylic acid ester group of compound (C) is the former.
- the equivalent ratio of 1: 0.1 to 1: 10 is more preferable, and more preferably 1: 0.2-1: 5.
- the organic sulfonate (X) is more preferably in a range of 0.3 to 60 mmol per 100 g of the total amount of both components (B) and (C). The range is 35-50 millimeters.
- thermosetting powder coating composition compound ( ⁇ ) and compound ( ⁇ )
- At least one of (C) is composed mainly of a polymer having a number average molecular weight in the range of 1,000 to 30,000.
- thermosetting powder coating composition contains four components of compound ( ⁇ ), compound ( ⁇ ), compound (C) and organic sulfonate (X) will be described. I do.
- the ratio of the equivalent of the hydroxyl group of compound ( ⁇ ) to the equivalent of the carboxylate group of compound (C) is equivalent to the former and the latter.
- the range of 1: 0 01: 1: 10 is more preferable, and more preferably 1: 0 ⁇ 2: 1: 5.
- the compounding amount of the compound (II) is not particularly limited, and the compound (II) can be added at an arbitrary ratio in addition to the compound (II) and the compound (C).
- the organic sulfonate (X) component has a range of 0.3 to 60 millimonoles for a total amount of 100 dalam of these compounds ( ⁇ ⁇ ), compound ( ⁇ ), and compound (C). The range is more preferably 0.35 to 50 mm.
- thermosetting powder coating composition of the present invention using each component.
- various known and commonly used methods can be applied.
- raw materials are appropriately selected in order to obtain the desired thermosetting powder coating composition from the aforementioned compound ( ⁇ ), compound ( ⁇ ), compound (C) and organic sulfonate (X).
- various known and commonly used raw materials such as leveling agents, ultraviolet absorbers, light stabilizers such as hindered amine type light stabilizers, antioxidants, pigments, pigment dispersants, etc. are mixed, melt-kneaded, and then finely pulverized.
- a thermosetting powder coating composition can be produced.
- thermosetting powder coating composition of the present invention can also be produced by a spray drying method in which a solution containing the above-described various raw materials is prepared and the solution is spray-dried.
- thermosetting powder coating composition of the present invention can be used as it is as a Taliya thermosetting powder coating composition, or a thermosetting powder coating composition colored by mixing a pigment. It can also be used as an object.
- thermosetting powder coating composition of the present invention can also be used in a form containing various known and commonly used curing agents as long as the characteristics and effects of the present invention are not impaired. is there.
- the curing agent those having reactivity with a hydroxyl group can be used.
- an aromatic diisocyanate such as tolylene diisocyanate and an aliphatic diisocyanate such as hexamethylene diisocyanate can be used.
- various polyisocyanates such as cycloaliphatic diisocyanates such as isophorone diisocyanate;
- thermosetting powder coating composition of the present invention is applied on a substrate to be coated by a known and usual method, and then crosslinked and cured to form a cured coating film (coating) on the substrate to be coated.
- a cured product of the intended thermosetting powder coating composition can be provided.
- Examples of the substrate to be coated include various metal materials or metal products such as iron, aluminum, stainless steel, galvanized sheet and tin plate, and chemical conversion treatment, zinc phosphate treatment, and chromate treatment. Surface-treated, electrodeposited, tiles, glass, various inorganic building materials, heat-resistant plastics, wood, and the like.
- hydroxyl value Dissolve the sample in a mixed solution of acetic anhydride and pyridine, heat and reflux at 100 ° C for one hour, acetylate the hydroxyl groups, add ion-exchanged water, further heat and reflux, then cool. It was determined by back titration with a toluene / methanol solution of potassium hydroxide.
- the measurement was carried out by liquid chromatography using 3000HXL and G2000HXL connected in series with tetrahydrofuran as an eluent.
- the dehydration condensation reaction was continued at 240 ° C to obtain a polyester resin (A_5) having a number average molecular weight of 1900, an acid value of 5 mg KOHZg, a hydroxyl value of 102 mgK ⁇ HZg, and a softening point of 115 ° C.
- Reference Example 7 A vinyl polymer having two or more carboxylic acid ester groups in a molecule
- a reaction vessel equipped with a stirrer, a dropping funnel and a nitrogen gas inlet tube was charged with 8.7 g of ⁇ , ⁇ -dimethylacetamide and 100 ml of toluene.
- the mixture was cooled to about 5 ° C. while stirring under a nitrogen atmosphere, and 15.0 parts by weight of trifluoromethanesulfonic acid was added dropwise over 1 hour.
- thermosetting powder coating composition (Preparation of thermosetting powder coating composition)
- thermosetting powder coating composition having an average particle size of 30-40 ⁇ ( ⁇ -1) one ( ⁇ -8), ( ⁇ -1) one ( ⁇ - 6) was prepared.
- Compound A—1 100 100 70
- thermosetting powder coating composition (P-1)-(P-8) and (p-1)-(p-5) After preparing various coating films according to the film forming method, each coating film was subjected to a coating film performance test.
- thermosetting powder coating composition (P-1)-(P-8) and (p-1)-(p-5) on the substrate, respectively, is 60-70 ⁇ m
- thermosetting powder coating composition strength hereinafter, the substrate to be coated having a powder coating film
- a 0.8 mm (thickness) ⁇ 70 mm ⁇ 150 mm zinc phosphate treated steel plate was used as the substrate.
- the coating film was subjected to rubbing for 10 reciprocations using felt impregnated with xylene, and the coating film was visually judged.
- the coating film is glossy and there is no noticeable damage to the coating film. ⁇ ⁇ ⁇ ⁇ ⁇ The coating film is glossy.
- the glossiness of the coating film is inferior and is etched by the solvent.
- the coating film is dissolved by the solvent and there is no glossiness.
- the coating film is dissolved by etching.
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Abstract
Description
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US10/583,910 US20070149755A1 (en) | 2003-12-24 | 2004-12-14 | Thermosetting powder coating composition |
EP04806980A EP1698675A1 (en) | 2003-12-24 | 2004-12-14 | Thermosetting powder coating composition |
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US20120238703A1 (en) * | 2011-03-15 | 2012-09-20 | Ppg Industries Ohio, Inc. | Thermosetting compositions catalyzed with phosphotungstic acid |
US20120237705A1 (en) * | 2011-03-15 | 2012-09-20 | Ppg Industries Ohio, Inc. | Method for coating containers |
WO2019069398A1 (ja) * | 2017-10-04 | 2019-04-11 | 共栄社化学株式会社 | 熱硬化性樹脂組成物 |
CN107828051B (zh) * | 2017-10-18 | 2019-10-18 | 清华大学 | 热固性树脂的处理方法及清除方法 |
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JPH0892503A (ja) * | 1994-09-27 | 1996-04-09 | Dainippon Ink & Chem Inc | 粉体塗料樹脂組成物 |
JPH0987552A (ja) * | 1995-09-27 | 1997-03-31 | Dainippon Ink & Chem Inc | 粉体塗料用樹脂組成物 |
JP2003119401A (ja) * | 2001-10-10 | 2003-04-23 | Dainippon Ink & Chem Inc | 硬化性樹脂組成物 |
JP2004161736A (ja) * | 2002-09-26 | 2004-06-10 | Dainippon Ink & Chem Inc | カルボン酸アミドの有機スルフォン酸塩及びその製造方法 |
JP2004203853A (ja) * | 2002-10-28 | 2004-07-22 | Dainippon Ink & Chem Inc | テトラメチルピペリジン誘導体の有機スルフォン酸塩及びその製造方法 |
JP2004315376A (ja) * | 2003-04-11 | 2004-11-11 | Dainippon Ink & Chem Inc | カルボン酸エステルの製造方法 |
-
2004
- 2004-12-14 US US10/583,910 patent/US20070149755A1/en not_active Abandoned
- 2004-12-14 WO PCT/JP2004/018619 patent/WO2005061639A1/ja not_active Application Discontinuation
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0892503A (ja) * | 1994-09-27 | 1996-04-09 | Dainippon Ink & Chem Inc | 粉体塗料樹脂組成物 |
JPH0987552A (ja) * | 1995-09-27 | 1997-03-31 | Dainippon Ink & Chem Inc | 粉体塗料用樹脂組成物 |
JP2003119401A (ja) * | 2001-10-10 | 2003-04-23 | Dainippon Ink & Chem Inc | 硬化性樹脂組成物 |
JP2004161736A (ja) * | 2002-09-26 | 2004-06-10 | Dainippon Ink & Chem Inc | カルボン酸アミドの有機スルフォン酸塩及びその製造方法 |
JP2004203853A (ja) * | 2002-10-28 | 2004-07-22 | Dainippon Ink & Chem Inc | テトラメチルピペリジン誘導体の有機スルフォン酸塩及びその製造方法 |
JP2004315376A (ja) * | 2003-04-11 | 2004-11-11 | Dainippon Ink & Chem Inc | カルボン酸エステルの製造方法 |
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