WO2014156814A1 - 活性エネルギー線硬化性組成物、その硬化塗膜、及び該硬化塗膜を有する物品 - Google Patents
活性エネルギー線硬化性組成物、その硬化塗膜、及び該硬化塗膜を有する物品 Download PDFInfo
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- WO2014156814A1 WO2014156814A1 PCT/JP2014/057283 JP2014057283W WO2014156814A1 WO 2014156814 A1 WO2014156814 A1 WO 2014156814A1 JP 2014057283 W JP2014057283 W JP 2014057283W WO 2014156814 A1 WO2014156814 A1 WO 2014156814A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
Definitions
- the present invention relates to an active energy ray-curable composition capable of imparting soft feel to the surface of various articles and capable of obtaining a coating film having high adhesion to a substrate, and an article using the same.
- plastic molded products have been widely used in the body of home appliances such as refrigerators, televisions, air conditioners and the like, as well as remote controllers, mobile phones, smartphones, personal computer cases such as personal computers.
- these plastic molded products may be used as they are, but are often painted to impart design properties.
- an isocyanate compound obtained by reacting a polyester polyol having two or more hydroxyl groups in one molecule and hexamethylene diisocyanate is further reacted with a (meth) acrylate having a hydroxyl group.
- An active energy ray-curable topcoat composition containing the obtained active energy ray-curable urethane (meth) acrylate and a photopolymerization initiator has been proposed (see, for example, Patent Document 1).
- this active energy ray-curable topcoat composition has a problem that the tactile sensation such as high elasticity and low grip necessary for soft feel is insufficient.
- the problem to be solved by the present invention is to provide an active energy ray-curable composition capable of imparting excellent tactile soft feel to the surface of various articles and obtaining a coating film having high adhesion to the substrate. It is to provide a product and an article using the product.
- active energy ray curing contains (meth) acrylate having an isocyanurate ring and a polyoxyalkylene chain and (meth) acrylate having a caprolactone structure.
- the present inventors have found that by using an adhesive composition, soft feel can be imparted to the surface of various articles, and a coating film having high adhesion to a substrate can be obtained, and the invention has been completed.
- a polyoxyalkylene chain having an average number of repeating units of 4 to 20 is bonded via a urethane bond to a structure having an isocyanurate ring, and the polyoxyalkylene chain on the side opposite to the urethane bond is bonded.
- An active energy ray-curable composition comprising a (meth) acrylate (A) having a (meth) acryloyl group at a terminal and a (meth) acrylate (B) having a caprolactone structure, and the same It relates to goods.
- the active energy ray-curable composition of the present invention can impart soft feel to the surface of various articles and can provide a coating film with high adhesion to the substrate. Therefore, soft feel can be imparted to the surface of a wide range of plastic molded products such as a main body of home appliances such as a refrigerator, a TV, an air conditioner, and a remote controller, a mobile phone, a smartphone, a personal computer, and other information terminals.
- a polyoxyalkylene chain having an average number of repeating units of 4 to 20 is bonded via a urethane bond to a structure having an isocyanurate ring, and is opposite to the urethane bond. It contains (meth) acrylate (A) having a (meth) acryloyl group at the end of the polyoxyalkylene chain and (meth) acrylate (B) having a caprolactone structure.
- the polyoxyalkylene chain and the terminal (meth) acryloyl group may be bonded via a divalent organic group such as a urethane bond.
- (meth) acryloyl refers to one or both of acryloyl and methacryloyl groups
- (meth) acrylate refers to one or both of acrylate and methacrylate
- (meth) acrylic “Acid” refers to one or both of acrylic acid and methacrylic acid.
- the (meth) acrylate (A) has an isocyanurate ring and a polyoxyalkylene chain having an average number of repeating units of 4 to 20 in its structure.
- Examples of the method for producing the (meth) acrylate (A) include the following methods (1) to (3).
- the urethanization reaction and esterification reaction performed by the above methods (1) to (3) can be performed by known methods.
- the urethanization reaction is preferably performed in the presence of a urethanization catalyst.
- the urethanization catalyst include amine compounds such as triethylamine, dibutyltin dilaurate, dioctyltin dilaurate, octyltin trilaurate, dioctyltin dineodecanate, dibutyltin diacetate, dioctyltin diacetate, organotin compounds such as dioctyltin, And organometallic compounds such as zinc octylate (zinc 2-ethylhexanoate).
- the polyisocyanate compound (a1) is not particularly limited as long as it has an isocyanurate ring on its structure, and examples thereof include diisocyanate trimers.
- diisocyanate examples include hexamethylene diisocyanate, phenylene diisocyanate, toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, and isophorone diisocyanate.
- Polyisocyanates obtained by reacting these diisocyanate trimers with polyols can also be used as the polyisocyanate compound (a1).
- polystyrene resin examples include aliphatic diols such as 2,2,4-trimethyl-1,3-pentanediol, 1,3-hexanediol, and 1,6-hexanediol, and dimers of unsaturated aliphatic alcohols. Etc.
- these polyisocyanate compounds (a1) can be used alone or in combination of two or more.
- polyisocyanate compounds (a1) those containing a trimerized product of hexamethylene diisocyanate are preferable because a soft feel with better tactile sensation can be obtained.
- the polyoxyalkylene mono (meth) acrylate (a2) is a compound having a polyoxyalkylene chain having an average number of repeating units of 4 to 20 and one (meth) acryloyl group.
- the following general formula (1) The compound represented by these is mentioned.
- R represents a hydrogen atom or a methyl group
- A represents an alkylene group
- n represents an average number of repetitions, and the range thereof is 4 to 20.
- A is one or two.
- the repeating units may be arranged in a random manner or in a block manner.
- A is preferably an alkylene group having 1 to 6 carbon atoms, and A is a propylene group.
- Polyoxypropylene mono (meth) acrylate and polyoxyethylene mono (meth) acrylate in which A is an ethylene group are more preferable.
- the range of n representing the average number of repeating oxyalkylenes is preferably 5 to 14, more preferably 6 to 13.
- these polyoxyalkylene mono (meth) acrylates (a2) can be used alone or in combination of two or more.
- Examples of the compound (a3) having an isocyanate group and a (meth) acryloyl group include 2- (meth) acryloyloxyethyl isocyanate and 1,1- (bis (meth) acryloyloxymethyl) ethyl isocyanate.
- the isocyanate group (NCO) of the polyisocyanate compound (a1) and the polyoxyethylene mono (meth) acrylate (a2) is preferably in the range of 0.8 to 1.1, more preferably in the range of 0.9 to 1.05, and 0.95 to 1.02. A range is further preferred.
- the (meth) acrylate (B) has a caprolactone structure and a (meth) acryloyl group in its structure.
- Examples of the (meth) acrylate (B) include urethanization of caprolactone-modified alkyl (meth) acrylate (BA) represented by the following general formula (2), the (meth) acrylate (BA) and a polyisocyanate compound.
- Urethane (meth) acrylate (BU) obtained by reaction
- polyester (meth) acrylate (BE) obtained by esterification reaction of the (meth) acrylate (BA) and polycarboxylic acid compound, hydroxyl group of polyhydric alcohol (Meth) acrylate (BM) etc. which are obtained by esterifying the compound and (meth) acrylic acid which a part or all modified
- R represents a hydrogen atom or a methyl group
- m represents an integer of 1 to 6
- n represents an average number of repeating units, and the range thereof is 1 to 10.
- the (meth) acrylate (B) is preferably a (meth) acrylate having an average number of repeating units of a caprolactone structure of 2 to 10 because adhesion and soft feel are improved.
- These polycaprolactone-modified alkyl (meth) acrylates (BA) can be used alone or in combination of two or more.
- Examples of the polyisocyanate compound used for the production of the (meth) acrylate (BU) include aromatic diisocyanate compounds such as tolylene diisocyanate, diphenylmethane diisocyanate, m-xylylene diisocyanate, and m-phenylenebis (dimethylmethylene) diisocyanate.
- polyisocyanate compound a prepolymer having an isocyanate group obtained by addition reaction of the diisocyanate compound with a polyhydric alcohol; a compound having an isocyanurate ring obtained by cyclization and trimerization of the diisocyanate compound; A polyisocyanate compound having a urea bond or a burette bond obtained by reacting the above diisocyanate compound with water can also be used.
- the above polyisocyanate compounds can be used alone or in combination of two or more.
- the urethanization reaction at the time of manufacturing the said (meth) acrylate (BU) can be performed by the well-known method mentioned above as a manufacturing method of the said (meth) acrylate (A).
- polycarboxylic acid compound used in the production of the (meth) acrylate (BE) examples include aliphatic polycarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid and maleic acid.
- polycarboxylic acid compound a prepolymer having a carboxy group obtained by reacting the above polycarboxylic acid compound with a polyhydric alcohol can also be used.
- esterification reaction at the time of manufacturing the said (meth) acrylate (BE) can be performed by a well-known method.
- Examples include trimethylolpropane, pentaerythritol, ditrimethylolpropane, dipentaerythritol, tripentaerythritol, diglycerin, polyglycerin and the like.
- esterification reaction at the time of manufacturing (meth) acrylate (BM) can be performed by a well-known method.
- BM (meth) acrylate
- examples of the (meth) acrylate (BM) include “Kayarad DPCA-60” (caprolactone-modified dipentaerythritol hexaacrylate, caprolactone average repeating unit number 1) manufactured by Nippon Kayaku Co., Ltd., “Kayarad DPCA-120” (Caprolactone-modified dipentaerythritol hexaacrylate, average number of repeating units of caprolactone is 2).
- the active energy ray-curable composition of the present invention only needs to contain the (meth) acrylate (A) and the (meth) acrylate (B), and the content ratio thereof is not particularly limited.
- the ester group concentration in the solid content of the composition is preferably in the range of 1.2 to 6.5 mmol / g, and more preferably in the range of 1.8 to 6 mmol / g because adhesion to the material is improved.
- the photopolymerization initiator is not included in the solid content of the composition.
- the active energy ray-curable monomer of the present invention (C) is an active energy ray-curable monomer (C).
- the photopolymerization initiator is not included in the solid content of the composition.
- Examples of the active energy ray-curable monomer (C) include N- (2-hydroxyethyl) (meth) acrylamide, N-isopropyl (meth) acrylamide, (meth) acryloylmorpholine, dimethylaminopropyl (meth). Examples include acrylamide, dimethyl (meth) acrylamide, diethyl (meth) acrylamide, tetrahydrofurfuryl (meth) acrylate, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Moreover, these active energy ray-curable monomers (C) can be used alone or in combination of two or more.
- the active energy ray-curable composition of the present invention can be formed into a cured coating film by irradiating active energy rays after being applied to a substrate.
- the active energy rays refer to ionizing radiation such as ultraviolet rays, electron beams, ⁇ rays, ⁇ rays, and ⁇ rays.
- a photopolymerization initiator (D) is added to the active energy ray curable composition of the present invention to improve curability.
- a photosensitizer can be further added to improve curability.
- ionizing radiation such as electron beam, ⁇ -ray, ⁇ -ray, and ⁇ -ray
- it cures quickly without using a photopolymerization initiator (D) or photosensitizer, so photopolymerization is particularly important. It is not necessary to add an initiator (D) or a photosensitizer.
- Examples of the photopolymerization initiator (D) include intramolecular cleavage type photopolymerization initiators and hydrogen abstraction type photopolymerization initiators.
- Examples of the intramolecular cleavage type photopolymerization initiator include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy.
- examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, methyl 4-phenylbenzophenone o-benzoylbenzoate, 4,4′-dichlorobenzophenone, hydroxybenzophenone, 4-benzoyl-4′-methyl-diphenyl sulfide.
- Benzophenone compounds such as acrylated benzophenone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 3,3′-dimethyl-4-methoxybenzophenone; 2-isopropylthioxanthone, 2,4 -Thioxanthone compounds such as dimethylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone; Aminobenzophenone compounds such as Michler-ketone, 4,4'-diethylaminobenzophenone; -2-chloro acridone, 2-ethyl anthraquinone, 9,10-phenanthrenequinone, camphorquinone, and the like.
- These photopolymerization initiators (D) can be used alone or in combination of two or more.
- the photosensitizer examples include amines such as aliphatic amines and aromatic amines, ureas such as o-tolylthiourea, sulfur such as sodium diethyldithiophosphate, s-benzylisothiuronium-p-toluenesulfonate, and the like. Compound etc. are mentioned.
- photopolymerization initiators and photosensitizers are preferably used in an amount of 0.05 to 20 parts by mass with respect to 100 parts by mass of the non-volatile component in the active energy ray-curable aqueous coating material of the present invention, respectively. More preferred is 10% by mass.
- silica particles (E) in the active energy ray-curable composition of the present invention in order to impart a good tactile sensation.
- the silica particles (E) include dry silica and wet silica. Among these, dry silica is preferable because tactile sensation is further improved, and dry silica whose surface is modified with an organic compound is more preferable.
- the average particle diameter of the silica particles is preferably in the range of 1 to 20 ⁇ m, more preferably in the range of 5 to 15 ⁇ m. The average particle diameter is measured with a laser diffraction / scattering particle size analyzer.
- a silicone surface conditioner (F) examples include polysiloxane-modified acrylic resin and polyether-modified polydimethylsiloxane.
- an organic solvent such as a stabilizer, a heat stabilizer, an ultraviolet absorber, an antioxidant, a leveling agent, an organic pigment, an inorganic pigment, and a pigment dispersant can be used.
- the coating method of the active energy ray-curable composition of the present invention varies depending on the article to be coated, for example, gravure coater, roll coater, comma coater, knife coater, air knife coater, curtain coater, kiss coater, shower
- the method include a coater, a wheeler coater, a spin coater, dipping, screen printing, spraying, an applicator, and a bar coater.
- the active energy ray-curable composition of the present invention is preferably diluted with an organic solvent in order to adjust the viscosity to be suitable for the above coating method.
- organic solvent include aromatic hydrocarbon solvents such as toluene and xylene; methanol, ethanol, isopropanol, t-butanol, propylene glycol monomethyl ether, propylene glycol normal propyl ether, ethylene glycol monobutyl ether, diacetone alcohol, and the like.
- Alcohol solvents such as ethyl acetate, butyl acetate, isobutyl acetate, normal propyl acetate, and propylene glycol monomethyl ether acetate; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, and cyclohexanone. These solvents can be used alone or in combination of two or more.
- the active energy ray for curing the active energy ray-curable composition of the present invention is an ionizing radiation such as an ultraviolet ray, an electron beam, an ⁇ ray, a ⁇ ray, and a ⁇ ray.
- an ionizing radiation such as an ultraviolet ray, an electron beam, an ⁇ ray, a ⁇ ray, and a ⁇ ray.
- a curing device for example, a germicidal lamp, an ultraviolet fluorescent lamp, a carbon arc, a xenon lamp, a high pressure mercury lamp for copying, an intermediate or high pressure mercury lamp, an ultrahigh pressure mercury lamp, an electrodeless lamp, a metal halide lamp, natural light, etc.
- the electron beam include ultraviolet rays, a scanning type, and a curtain type electron beam accelerator.
- the active energy ray-curable composition of the present invention can impart soft feel to the surface of various articles.
- the active energy ray-curable composition of the present invention may be applied directly to an article to be coated, or after applying a primer coating material suitable for the article to be coated, A wire curable composition may be applied.
- primer coating material examples include various types such as a one-component type in which an acrylic resin or the like is diluted with an organic solvent, a two-component type in which a polyol is diluted with an organic solvent and a polyisocyanate is diluted with an organic solvent. Can be used.
- PC polycarbonate
- ABS acrylonitrile-butadiene-styrene copolymer
- PMMA polymethyl methacrylate
- Various resins such as polyethylene terephthalate (PET), polyamide (PA), polypropylene (PP); fiber reinforced plastics (FRP) in which fillers such as glass fibers are added to these resins; iron, copper, zinc, aluminum, magnesium, etc.
- the article of the present invention has a cured coating film of the active energy ray-curable composition of the present invention.
- the main body of home appliances such as a refrigerator, a TV, and an air conditioner and its remote controller, mobile phone, smartphone, personal computer
- a casing of an information terminal such as a plastic molded product such as an automobile interior material.
- Example 1 Preparation of active energy ray-curable composition (1)
- Examples 2 to 7 Preparation of active energy ray-curable compositions (2) to (7)
- the same operation as in Example 1 was conducted except that the solution of (meth) acrylate (A-1) and the solution of (meth) acrylate (B-1) used in Example 1 were changed to the compositions shown in Table 1 below.
- active energy ray-curable compositions (2) to (7) were prepared.
- Table 1 shows the compositions of the active energy ray-curable compositions (1) to (7) and (R1) to (R2) obtained above.
- (Meth) acrylate (B-4) in Table 1 above is Kayrad DPCA-120 (manufactured by Nippon Kayaku Co., Ltd .: polycaprolactone-modified dipentaerythritol hexaacrylate, average number of repeating units of caprolactone: 2, solid content The ester group concentration in the mixture was 9.2 mmol / g), and “(meth) acrylate (B-5)” was Plaxel FA-5 (produced by Daicel Corporation: polycaprolactone-modified hydroxyethyl monoacrylate, average repeat of caprolactone) The number of units is 5, the hydroxyl value is 80.0, and the ester group concentration in the solid content is 8.6 mmol / g).
- Example 8 Evaluation of active energy ray-curable composition (1)
- the active energy ray-curable composition (1) obtained above on the surface of an ABS resin plate (thickness 1 mm) is thinner (diacetone alcohol / methyl isobutyl ketone / ethyl acetate / After diluting with butyl acetate 30/30/20/20 (mass%), spray coating was performed. Then, after leaving at room temperature (25 ° C.) for 10 minutes, after preliminary drying at 60 ° C. for 10 minutes in a dryer, using a high-pressure mercury lamp with an output of 80 W / cm, an irradiation amount of 0.8 J / cm 2 Ultraviolet irradiation was performed to produce a cured coating film for evaluation.
- Example 9 to 14 Evaluation of active energy ray-curable compositions (2) to (7)
- the active energy ray-curable compositions (2) to (7) obtained in Examples 2 to 7 were used. Except that each was used, it was carried out in the same manner as in Example 8 to prepare a cured coating film for evaluation, and the coating film appearance, adhesion and soft feel were evaluated.
- Table 2 shows the evaluation results of Examples 8 to 14 and Comparative Examples 3 to 4 described above.
- the active energy ray-curable compositions of the present invention of Examples 1 to 7 were found to have very high adhesion to the substrate.
- the cured coating film was also found to have a soft feel with good tactile sensation (Examples 8 to 14).
- Comparative Example 1 is an example in which the composition does not contain (meth) acrylate having a polycaprolactone structure, but the adhesion to the substrate was found to be poor (Comparative Example 3).
- Comparative Example 2 is an example not containing (meth) acrylate having an isocyanurate ring and a polyoxyalkylene chain in its structure, but it was found that the soft feel was insufficient (Comparative Example 4).
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Abstract
Description
(1)イソシアヌレート環を有するポリイソシアネート化合物(a1)のイソシアネート基と、ポリオキシアルキレンモノ(メタ)アクリレート(a2)が有する水酸基とをウレタン化反応させる方法。
(2)前記ポリイソシアネート化合物(a1)のイソシアネート基と、ポリオキシアルキレン(ポリアルキレングリコール)が有する2つの水酸基のうち1つの水酸基とをウレタン化反応させた後、残った水酸基と(メタ)アクリル酸とをエステル化反応させる方法。
(3)前記(2)のウレタン化反応の後、残った水酸基とイソシアネート基及び(メタ)アクリロイル基を有する化合物(a3)を反応させる方法。
トリメチロールプロパン、ペンタエリスリトール、ジトリメチロールプロパン、ジペンタエリスリトール、トリペンタエリスリトール、ジグリセリン、ポリグリセリン等が挙げられる。
「組成物の固形分中のエステル基濃度(mmol/g)」=「(メタ)アクリレート(A)中のエステル基のモル数(mmol)+(メタ)アクリレート(B)中のエステル基のモル数(mmol)」/「組成物の固形分の質量(g)」に従い計算により求めたものである。なお、光重合開始剤は組成物の固形分に含まないものとする。
「組成物の固形分中のエステル基濃度(mmol/g)」=「(メタ)アクリレート(A)中のエステル基のモル数(mmol)+(メタ)アクリレート(B)中のエステル基のモル数(mmol)+活性エネルギー線硬化性単量体(C)中のエステル基のモル数(mmol)」/「組成物の固形分の質量(g)」に従い計算により求めたものである。なお、光重合開始剤は組成物の固形分に含まないものとする。
攪拌機、温度計、滴下ロート、冷却管及び空気導入口を備えた反応容器に、ヘキサメチレンジイソシアネートの3量化物(NCO:23.5質量%)178.72質量部、ジブチルヒドロキシトルエン1.55質量部、メトキノン0.15質量部及びジオクチル錫ジネオデカネート0.15質量部を仕込んで、空気の通気下、攪拌しながら、60℃まで昇温した。次いで、ポリオキシエチレンモノアクリレート((日油株式会社製「ブレンマーAE-400」、EOの平均繰り返し単位数n=10、水酸基価=95.6)598.56質量部を1時間かけて滴下した。滴下終了後、反応容器中を80℃まで昇温し、5時間攪拌することによりウレタン化反応を行い、不揮発分80質量%になるように酢酸エチルで希釈し、(メタ)アクリレート(A-1)の溶液を得た。(固形分中のエステル基濃度:1.3mmol/g)
攪拌機、温度計、滴下ロート、冷却管及び空気導入口を備えた反応容器に、ヘキサメチレンジイソシアネートの3量化物(NCO:23.5質量%)178.72質量部、ジブチルヒドロキシトルエン1.06質量部、メトキノン0.11質量部及びジオクチル錫ジネオデカネート0.11質量部を仕込んで、空気の通気下、攪拌しながら、60℃まで昇温した。次いで、ポリカプロラクトン変性ヒドロキシエチルモノアクリレート(株式会社ダイセル製「プラクセルFA-2D」、カプロラクトンの平均繰り返し単位数n=2、水酸基価=163.0)351.1質量部を1時間かけて滴下した。滴下終了後、反応容器中を80℃まで昇温し、5時間攪拌することによりウレタン化反応を行い、不揮発分80質量%になるように酢酸エチルで希釈し、(メタ)アクリレート(B-1)の溶液を得た。(固形分中のエステル基濃度:5.8mmol/g)
攪拌機、温度計、滴下ロート、冷却管及び空気導入口を備えた反応容器に、4,4’-ジシクロヘキシルメタンジイソシアネート131.18質量部、ジブチルヒドロキシトルエン1.0質量部、メトキノン0.1質量部及びジオクチル錫ジネオデカネート0.1質量部を仕込んで、空気の通気下、攪拌しながら、60℃まで昇温した。次いで、ポリカプロラクトン変性ヒドロキシエチルモノアクリレート(株式会社ダイセル製「プラクセルFA-2D」、カプロラクトンの平均繰り返し単位数n=2、水酸基価=163.0)351.1質量部を1時間かけて滴下した。滴下終了後、反応容器中を80℃まで昇温し、5時間攪拌することによりウレタン化反応を行い、不揮発分80質量%になるように酢酸エチルで希釈し、(メタ)アクリレート(B-2)の溶液を得た。(固形分中のエステル基濃度:6.3mmol/g)
攪拌機、温度計、滴下ロート、冷却管及び空気導入口を備えた反応容器に、ヘキサメチレンジイソシアネートの3量化物(NCO:23.5質量%)178.72質量部、ジブチルヒドロキシトルエン1.8質量部、メトキノン0.2質量部及びジオクチル錫ジネオデカネート0.2質量部を仕込んで、空気の通気下、攪拌しながら、60℃まで昇温した。次いで、ポリカプロラクトン変性ヒドロキシエチルモノアクリレート(株式会社ダイセル製「プラクセルFA-5」、カプロラクトンの平均繰り返し単位数n=5、水酸基価=80.0)715.3質量部を1時間かけて滴下した。滴下終了後、反応容器中を80℃まで昇温し、5時間攪拌することによりウレタン化反応を行い、不揮発分80質量%になるように酢酸エチルで希釈し、(メタ)アクリレート(B-3)の溶液を得た。(固形分中のエステル基濃度:6.8mmol/g)
合成例1で得られた(メタ)アクリレート(A-1)の溶液(不揮発分80質量%)84.38質量部((メタ)アクリレート(A-1)として67.5質量部)、合成例2で得られた(メタ)アクリレート(B-1)の溶液(不揮発分80質量%)28.13質量部((メタ)アクリレート(B-1)として22.5質量部)の混合物に、光重合開始剤(BASFジャパン株式会社製「イルガキュア184」、1-ヒドロキシシクロヘキシルフェニルケトン)3質量部、シリカ粒子(エボニック社製「ACEMATT 3300」、平均粒子径9.5μm)10質量部、ポリシロキサン変性アクリル樹脂(ビックケミー・ジャパン株式会社製「BYK-3550」、不揮発分52質量%;以下、「表面調整剤(1)」と略記する。)0.77質量部(有効成分として0.4質量部)及びポリエーテル変性ポリジメチルシロキサン(ビックケミー・ジャパン株式会社製「BYK-333」、不揮発分100質量%;以下、「表面調整剤(2)」と略記する。)0.3質量部を加えて均一に混合し、固形分中のエステル基濃度が2.2mmol/gの活性エネルギー線硬化性組成物(1)を得た。
実施例1で用いた(メタ)アクリレート(A-1)の溶液及び(メタ)アクリレート(B-1)の溶液を、下記の表1に示す組成に変更した以外は実施例1と同様に操作することにより、活性エネルギー線硬化性組成物(2)~(7)を調製した。
実施例1で用いた(メタ)アクリレート(A-1)の溶液及び(メタ)アクリレート(B-1)の溶液を、下記の表2に示す組成に変更した以外は実施例1と同様に操作することにより、活性エネルギー線硬化性組成物(R1)~(R2)を調製した。
ABSの樹脂板(厚さ1mm)の表面に上記で得られた活性エネルギー線硬化性組成物(1)をスプレー塗装が可能な粘度になるまでシンナー(ジアセトンアルコール/メチルイソブチルケトン/酢酸エチル/酢酸ブチル=30/30/20/20(質量%))で希釈した後、スプレー塗装した。その後、室温(25℃)で10分間放置した後、乾燥機中で60℃で10分間の予備乾燥した後、出力80W/cmの高圧水銀ランプを用いて、照射量0.8J/cm2の紫外線照射を行い、評価用硬化塗膜を作製した。
上記で得られた評価用硬化塗膜をJIS K-5400の碁盤目試験法に基づいて測定した。前記硬化塗膜の上にカッターで1mm幅の切込みを入れ碁盤目の数を100個とし、全ての碁盤目を覆うようにセロハンテープを貼り付け、すばやく引き剥がして付着して残っている碁盤目の数から、下記の基準により密着性を評価した。
◎:90~100個
○:80~89個
△:50~79個
×:49個以下
上記で得られた評価用硬化塗膜の表面を指で触り、得られた触感から下記の基準によりソフトフィール性を評価した。
5:弾力性がありシルクのような触感
4:やや弾力性が低いがさらっとした触感
3:弾力性がなく、若干グリップ感のある触感
2:弾力性がなくグリップ感のある触感
1:べたつきのある触感
実施例8で用いた実施例1で得られた活性エネルギー線硬化性組成物(1)に代えて、実施例2~7で得られた活性エネルギー線硬化性組成物(2)~(7)をそれぞれ用いた以外は、実施例8と同様に行い、評価用硬化塗膜を作製し、塗膜外観、密着性及びソフトフィール性を評価した。
実施例8で用いた実施例1で得られた活性エネルギー線硬化性組成物(1)に代えて、比較例1~2で得られた活性エネルギー線硬化性組成物(R1)~(R2)をそれぞれ用いた以外は、実施例8と同様に行い、評価用硬化塗膜を作製し、塗膜外観、密着性及びソフトフィール性を評価した。
Claims (8)
- イソシアヌレート環を有する構造とウレタン結合を介して、平均繰り返し単位数4~20のポリオキシアルキレン鎖が結合しており、前記ウレタン結合とは反対側のポリオキシアルキレン鎖の末端に(メタ)アクリロイル基を有する(メタ)アクリレート(A)と、カプロラクトン構造を有する(メタ)アクリレート(B)とを含有することを特徴とする活性エネルギー線硬化性組成物。
- 固形分中のエステル基濃度が1.2~6.5mmol/gである請求項1記載の活性エネルギー線硬化性組成物。
- 前記(メタ)アクリレート(A)が、イソシアヌレート環を有するポリイソシアネート(a1)と平均繰り返し単位数4~20のポリオキシアルキレンモノ(メタ)アクリレート(a2)とを反応させて得られたものである請求項1又は2記載の活性エネルギー線硬化性組成物。
- 前記ポリオキシアルキレンモノ(メタ)アクリレート(a2)が、ポリオキシプロピレンモノ(メタ)アクリレート及び/又はポリオキシエチレンモノ(メタ)アクリレートである請求項3記載の活性エネルギー線硬化性組成物。
- 前記ポリイソシアネート(a1)が、ヘキサメチレンジイソシアネートの3量化物を含むものである請求項3又は4記載の活性エネルギー線硬化性組成物。
- 前記(メタ)アクリレート(B)が有するカプロラクトン構造の平均繰り返し単位数が、2~10である請求項1~5のいずれか1項記載の活性エネルギー線硬化性組成物。
- 請求項1~6のいずれか1項記載の活性エネルギー線硬化性組成物に活性エネルギー線を照射して得られることを特徴とする硬化塗膜。
- 請求項7記載の硬化塗膜を有することを特徴とする物品。
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