WO2016104389A1 - 活性エネルギー線硬化性組成物およびその用途 - Google Patents
活性エネルギー線硬化性組成物およびその用途 Download PDFInfo
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- WO2016104389A1 WO2016104389A1 PCT/JP2015/085607 JP2015085607W WO2016104389A1 WO 2016104389 A1 WO2016104389 A1 WO 2016104389A1 JP 2015085607 W JP2015085607 W JP 2015085607W WO 2016104389 A1 WO2016104389 A1 WO 2016104389A1
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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
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
- C08G75/045—Polythioethers from mercapto compounds or metallic derivatives thereof from mercapto compounds and unsaturated compounds
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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
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
Definitions
- the present invention relates to an active energy ray-curable composition and its use.
- the ene-thiol photocurable resin composition which is a radical polymerization photocurable system, can regenerate active thiyl radicals even if radical deactivation occurs due to oxygen. Therefore, the composition has no polymerization inhibition due to oxygen as seen in acrylic materials, can reduce the amount of photopolymerization initiator used, has a small volumetric shrinkage during curing, and is several seconds from the start of polymerization. Since it has an advantage that it can be cured in a short time of several minutes and a cured product having a thickness of 1 mm or more can be produced, it has attracted attention as a photo-curing material (Non-patent Document 1).
- Patent Document 1 contains a polyene, a polythiol, and a compound having a bromine-substituted aromatic ring having a specific structure, and a polyene and a polythiol.
- a photocurable resin composition having a mass ratio of 49: 1 to 1:49 is disclosed.
- Patent Document 2 discloses an ene-thiol photocurable resin composition comprising a polyene compound and a (poly) thiol monomer comprising a reaction product of a polyvalent amine compound and a mercaptocarboxylic acid compound. It is disclosed.
- Patent Document 1 is a technique for providing a photocurable resin composition having a high refractive index and capable of adjusting the refractive index with high accuracy.
- the technique disclosed in Patent Document 2 has no inhibition of polymerization by oxygen, can be cured in a short time, has a small volume shrinkage, can reduce the amount of photopolymerization initiator used, and has significantly improved moisture resistance. It is a technology that gives an improved cured product.
- Patent Documents 1 and 2 do not mention anything about the impact absorbability and vibration absorbability of the cured product.
- Patent Document 3 is characterized by comprising a cured product of a polymerizable composition containing at least one of diallyl phthalate, diallyl isophthalate and diallyl terephthalate and pentaerythritol tetra (3-mercaptopropionate).
- a transparent resin is disclosed.
- the impact property described in Patent Document 3 is a concept close to the presence or absence of penetration of a sphere or scattering of a sample, that is, toughness and elongation characteristics, and is different in characteristics from impact absorbability focused on rebound.
- turbidity (haze) and yellowness (b * value) which are indicators of transparency.
- the present invention has been made in view of the above problems, and is an active energy ray-curable composition that gives a cured product that is excellent in transparency and excellent in shock absorption and vibration absorption, and the active energy. It is an object of the present invention to provide a cured product, a shock absorbing material, a vibration absorbing material, and a sheet material obtained from a linear curable composition.
- active energy ray curing includes diallyl 1,4-cyclohexanedicarboxylate (A), a compound (B) having two or more mercapto groups, and a polymerization initiator (C).
- A diallyl 1,4-cyclohexanedicarboxylate
- B compound having two or more mercapto groups
- C polymerization initiator
- the present invention includes the following active energy ray-curable compositions (1) to (6), a cured product (7), a shock absorber (8), a vibration absorber (9) and a sheet (10).
- Component (A) diallyl 1,4-cyclohexanedicarboxylate
- Component (B) An active energy ray-curable composition containing a compound having two or more mercapto groups and a polymerization initiator (C).
- the ratio of the number of allyl groups of the component (A) to the number of mercapto groups of the component (B) is in the range of 30:70 to 70:30, and the components (A) and (B).
- the active energy ray-curable composition according to (1) or (2) comprising 0.01 to 10 parts by mass of the polymerization initiator (C) with respect to 100 parts by mass in total.
- the ratio of the total number of allyl groups of the component (A) and (meth) acryloyloxy groups of the urethane (meth) acrylate to the number of mercapto groups of the component (B) is 30:70 to 70:30.
- the polymerization initiator (C) is contained in an amount of 0.01 to 10 parts by mass with respect to a total of 100 parts by mass of the component (A), urethane (meth) acrylate, and component (B).
- an active energy ray-curable composition that gives a cured product excellent in transparency and excellent in shock absorption and vibration absorption, a cured product obtained from the active energy ray-curable composition, and shock absorption Materials, vibration absorbers and sheet materials can be provided.
- the active energy ray-curable composition of the present invention (hereinafter also simply referred to as “the composition of the present invention”) includes diallyl 1,4-cyclohexanedicarboxylate (A) and compound (B) having two or more mercapto groups. And a polymerization initiator (C).
- Component (A) is diallyl 1,4-cyclohexanedicarboxylate, which is available from Showa Denko KK under the product name H-DATP. Transparency can be improved by using a component (A).
- the component (B) preferably has a mercapto group-containing group in which the carbon atom at the ⁇ -position and / or the ⁇ -position has a substituent with respect to the mercapto group. At least one of the substituents is preferably an alkyl group.
- the carbon atom at the ⁇ -position and / or ⁇ -position with respect to the mercapto group has a substituent, that is, a structure branched at the ⁇ -position and / or ⁇ -position with respect to the mercapto group, in other words, the ⁇ -position of the mercapto group and // A so-called branched structure in which the ⁇ -position carbon is bonded to three or more atoms other than hydrogen.
- the case where at least one of the substituents is an alkyl group means that at least one of substituents other than the main chain at the ⁇ -position and / or ⁇ -position with respect to the mercapto group is an alkyl group.
- the main chain represents the longest chain structure composed of atoms other than hydrogen including a mercapto group.
- a group represented by the following formula (1) is particularly preferable.
- R 1 and R 2 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, at least one of which is an alkyl group. That is, R 1 and R 2 are not both hydrogen atoms. When R 1 and R 2 are both alkyl groups, they may be the same or different.
- the alkyl group having 1 to 10 carbon atoms represented by R 1 and R 2 may be linear or branched, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, Examples thereof include an n-butyl group, an iso-butyl group, a tert-butyl group, an n-hexyl group, and an n-octyl group, and a methyl group or an ethyl group is preferable.
- the component (B) is not particularly limited as long as it is a compound having two or more mercapto groups, but is preferably a polyfunctional thiol compound having two or more mercapto group-containing groups described above.
- the two or more mercapto group-containing groups may be the same or different.
- the component (B) has a carboxylic acid derivative structure such that the mercapto group-containing group represented by the formula (1) is represented by the following formula (3).
- the component (B) is preferably an ester of a mercapto group-containing carboxylic acid represented by the formula (2) and an alcohol.
- polyfunctional alcohols are preferred. By using a polyfunctional alcohol, the compound after the esterification reaction can be made into a polyfunctional thiol compound.
- polyfunctional alcohol examples include alkylene glycol (wherein the alkylene group preferably has 2 to 10 carbon atoms, and the carbon chain thereof may be branched), diethylene glycol, glycerin, dipropylene glycol, trimethylolpropane, pentane. Examples include erythritol and dipentaerythritol. Examples of the alkylene glycol include ethylene glycol, trimethylene glycol, 1,2-propylene glycol, 1,2-butanediol, 1,3-butanediol, 2,3-butanediol, and tetramethylene glycol.
- Preferred polyfunctional alcohols are alkylene glycols having 2 carbon atoms in the alkylene main chain such as ethylene glycol, 1,2-propylene glycol and 1,2-butanediol, and trimethylolpropane.
- Examples of the mercapto group-containing carboxylic acid of the formula (2) include 2-mercaptopropionic acid, 3-mercaptobutyric acid, 2-mercaptoisobutyric acid, and 3-mercaptoisobutyric acid.
- Specific examples of the thiol compound having the structure of the formula (1) include the following compounds.
- hydrocarbon dithiol examples include 2,5-hexanedithiol, 2,9-decanedithiol, 1,4-bis (1-mercaptoethyl) benzene, and the like.
- hydrocarbon dithiol examples include 2,5-hexanedithiol, 2,9-decanedithiol, 1,4-bis (1-mercaptoethyl) benzene, and the like.
- compound having an ester bond structure include di (1-mercaptoethyl ester) phthalate, di (2-mercaptopropyl ester) phthalate, di (3-mercaptobutyl ester) phthalate, and di (3-mercaptoisobutyl phthalate). Ester) and the like.
- the molecular weight of component (B) is not particularly limited, but is preferably 200 to 1,000 from the viewpoint of impact absorption.
- a compound having a primary thiol and a secondary thiol can be easily obtained as a commercial product.
- a primary thiol compound containing two or more mercapto groups in a commercially available molecule pentaerythritol-tetrakis (3-mercaptopropionate) (trade name: PEMP, manufactured by Sakai Chemical Co., Ltd.) Etc.
- 1,4-bis (3-mercaptobutyryloxy) butane (trade name: Karenz MT BD1, Showa Denko ( ), Pentaerythritol tetrakis (3-mercaptobutyrate) (trade name: Karenz MT ⁇ PE1, Showa Denko KK), 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3 , 5-triazine-2,4,6 (1H, 3H, 5H) -trione (trade name: Karenz MT NR1, manufactured by Showa Denko KK), trimethylolpropane-tris (3-mercaptobutyrate) (trade name) TPMB, manufactured by Showa Denko KK).
- the use of a compound in which all mercapto groups are bonded to a secondary carbon atom or a tertiary carbon atom as the component (B) used in the present invention is excellent in the storage stability of the composition, and has an odor. It is more preferable from the point of very few.
- the photopolymerization initiator is not particularly limited as long as it is a compound that generates radicals that contribute to the initiation of radical polymerization upon irradiation with active energy rays such as near infrared rays, visible rays, and ultraviolet rays.
- photopolymerization initiator examples include acetophenone, 2,2-dimethoxy-2-phenylacetophenone, diethoxyacetophenone, 1-hydroxycyclohexyl phenyl ketone, 1,2-hydroxy-2-methyl-1-phenylpropane-1- ON, ⁇ -hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone, 2-hydroxy-2-methyl-1- (4-isopropylphenyl) propanone, 2-hydroxy-2-methyl-1 -(4-dodecylphenyl) propanone, 2-hydroxy-2-methyl-1-[(2-hydroxyethoxy) phenyl] propanone, benzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, 4-methoxy Benzopheno 2-chlorobenzophenone, 4-chlorobenzophenone, 4-bromobenzophenone, 2-carboxybenzophenone, 2-ethoxycarbonyl
- bisacylphosphine oxides include bis- (2,6-dichlorobenzoyl) phenylphosphine oxide, bis- (2,6-dichlorobenzoyl) -2,5-dimethylphenylphosphine oxide, bis- (2, 6-dichlorobenzoyl) -4-propylphenylphosphine oxide, bis- (2,6-dichlorobenzoyl) -1-naphthylphosphine oxide, bis- (2,6-dimethoxybenzoyl) phenylphosphine oxide, bis- ( 2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide, bis- (2,6-dimethoxybenzoyl) -2,5-dimethylphenylphosphine oxide, bis- (2,4,6- Trimethylbenzoyl) phenyl phosphite Oxide, (2,5,6-trimethylbenzo
- a metallocene compound can be used as a photopolymerization initiator.
- the metallocene compound the transition metal represented by Fe, Ti, V, Cr, Mn, Co, Ni, Mo, Ru, Rh, Lu, Ta, W, Os, Ir, etc. can be used as the metallocene compound,
- An example is bis ( ⁇ 5-2,4-cyclopentadien-1-yl) -bis [2,6-difluoro-3- (pyrrol-1-yl) phenyl] titanium.
- 1-hydroxycyclohexyl phenyl ketone and 2,4,6-trimethylbenzoyldiphenylphosphine oxide are preferable from the viewpoint of the stability of the active energy ray-curable composition after the addition of a photopolymerization initiator.
- the former is available from BASF under the product name Irgacure 184, and the latter is available from BASF under the product name LUCIRIN TPO.
- the thermal polymerization initiator is not particularly limited as long as it does not adversely affect physical properties such as impact resistance of the cured product, and known ones can be used.
- the thermal polymerization initiator used in the present invention is preferably one that is soluble in other components present in the composition to be cured and generates free radicals at 30 to 120 ° C.
- thermal polymerization initiator examples include diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di-sec-butyl peroxydicarbonate, t-butyl perbenzoate, and the like. However, it is not limited to these. From the viewpoint of curability, diisopropyl peroxydicarbonate is preferred.
- the content of the polymerization initiator (C) is preferably 0.01 to 10 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). 5 to 5.0 parts by mass are more preferable.
- content of a polymerization initiator (C) is 100 in total of a compound (A), urethane (meth) acrylate, and a compound (B).
- the amount is preferably 0.01 to 10 parts by mass, more preferably 0.5 to 5.0 parts by mass with respect to parts by mass.
- a polymerization initiator (C) can be used individually by 1 type, or can also be used in combination of 2 or more type by arbitrary ratios.
- the active energy ray-curable composition of the present invention may contain urethane (meth) acrylate as long as the object of the present invention is not impaired.
- urethane (meth) acrylate is a general term for urethane acrylate and urethane methacrylate.
- the urethane (meth) acrylate is not particularly limited, but those having a flexible skeleton, that is, those having a polyether skeleton or a polyester skeleton are preferable from the viewpoint of sheet moldability.
- Examples of the urethane (meth) acrylate include trade names UA-160TM, UA-122P, UA-290TM, UA-1013P, U-200PA (manufactured by Shin-Nakamura Chemical Co., Ltd.), EBECRYL 230, 270, 284, 8411, 8413, 8800.
- Urethane (meth) acrylate can be used individually by 1 type, and can also be used combining 2 or more types by arbitrary ratios.
- the blending amount of urethane (meth) acrylate is not particularly limited, but is preferably 10 to 60% by mass, more preferably 20 to 40% by mass based on the total mass of the composition from the viewpoint of moldability.
- the active energy ray-curable composition of the present invention may contain an inorganic filler as long as the object of the present invention is not impaired.
- inorganic filler used for this invention disperse
- examples of such inorganic fillers include silica (SiO 2 ), alumina (Al 2 O 3 ), titania (TiO 2 ), tantalum oxide (Ta 2 O 5 ), zirconia (ZrO 2 ), and silicon nitride (Si).
- fine particle silica is preferably used from the viewpoint of viscosity adjustment and sheet formability, and is available from Nippon Aerosil Co., Ltd. under the trade name Aerosil (trademark). Aerosil (trademark) OX50, RX50, RY50, 50, NAX50, NY50, NA50H, NA50Y, 90G, NX90G, 130, R972, RY200S, 150, R202, 200, R974, R9200, RX200, R8200, RY200, R104, RA200H, RA200HS, NA200Y, R805, R711, R7200, 300, R976, R976S, RX300, R812, R812S, RY300, R106, 380, P25, T805, P90, NKT90, AluC, AluC805, etc. can be used. RX200 is more preferable from the viewpoint of dispersibility.
- the blending amount of the inorganic filler is not particularly limited, but may be less than 10 parts by weight, preferably 2 to 6 parts by weight with respect to 100 parts by weight in total of component (A), component (B) and urethane (meth) acrylate. More preferably, the content is 0.1 to 5 parts by mass from the viewpoint of moldability.
- a polymerization inhibitor may be added as necessary in order to improve the storage stability of the composition.
- Polymerization inhibitors include 4-methoxy-1-naphthol, 1,4-dimethoxynaphthalene, 1,4-dihydroxynaphthalene, 4-methoxy-2-methyl-1-naphthol, 4-methoxy-3-methyl-1- Naphthol, 1,4-dimethoxy-2-methylnaphthalene, 1,2-dihydroxynaphthalene, 1,2-dihydroxy-4-methoxynaphthalene, 1,3-dihydroxy-4-methoxynaphthalene, 1,4-dihydroxy-2- Methoxynaphthalene, 1,4-dimethoxy-2-naphthol, 1,4-dihydroxy-2-methylnaphthalene, pyrogallol, methylhydroquinone, tertiary butylhydroquinone, 4-methoxyphenol, N-nitroso-N-phenylhydroxyamine aluminum, etc.
- methylhydroquinone, pyrogallol, and tertiary butylhydroquinone are preferable from the viewpoint of storage stability of the active energy ray-curable composition.
- the blending amount of the polymerization inhibitor is not particularly limited, but it may be less than 0.1 parts by mass, preferably 0.0001 to 0.05 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). However, it may be from the viewpoint of storage stability.
- the active energy ray-curable composition of the present invention includes a urethane (meth) acrylate, an inorganic filler, and a polymerization as necessary. At least one selected from inhibitors may be added, and other components may be contained as optional components within a range not impairing the object of the present invention. However, from the viewpoint of impact resistance and the like, it is preferable not to use a compound having an ethylenically unsaturated group and an isocyanate group in one molecule in the composition of the present invention.
- the blending amount of the mercapto compound other than the component (B) is preferably 20% by mass or less of the total mercapto compound from the viewpoint of maintaining impact absorption, transparency, low odor characteristics, and the like.
- composition of the present invention can be used without a solvent or a solvent, but it is preferably used without a solvent.
- materials that are preferably added as other components include color materials such as carbon materials, pigments, and dyes.
- Examples of the carbon material include carbon black, acetylene black, lamp black, and graphite.
- Examples of the pigment include black pigments such as iron black, aniline black, cyanine black, and titanium black.
- the composition of this invention may contain organic pigments, such as red, green, and blue. Commercially available gel nails or UV craft pigments may be used. Examples of such pigments include Pikaace coloring pigments (701, 731, 741, 755, 762) and transparent pigments (900, 901, 910). 920, 921, 922, 924, 930, 932, 941, 942, 945, 947, 950, 955, 957, 960, 963, 968, 970, 980, 981, 982, 985).
- the dye examples include direct dyes, acid dyes, basic dyes, mordant dyes, acid mordant dyes, vat dyes, disperse dyes, reactive dyes, fluorescent whitening dyes, and plastic dyes.
- the dye means a substance having solubility in a solvent or compatibility with a resin and a property of coloring the dissolved or compatible substance.
- the plastic dye examples include KP PLAST (KP Plas Red B, KP Plas Blue GR, KP Plas Yellow HK).
- the content of the coloring material in the composition of the present invention is not particularly limited. However, if the concentration is too high, the transmittance of the active energy rays may be lowered, and there is a possibility of causing poor curing. Therefore, the content of the coloring material is usually 60% by mass or less, preferably 0.0001 to 40% by mass in the composition.
- the composition of the present invention includes, as necessary, other components: (a) a thermoplastic resin; (b) a deodorant; (c) a silane coupling agent and a titanium coupling agent.
- D Antioxidants such as hindered amines, hydroquinones, hindered phenols;
- Ultraviolet absorbers such as benzophenones, benzotriazoles, salicylic acid esters, metal complex salts;
- Stabilizers such as metal soaps, inorganic and organic salts of heavy metals (such as zinc, tin, lead, cadmium, etc.), organic tin compounds; (g) acetic acid, acrylic acid, palmitic acid, oleic acid, mercaptocarboxylic acid, etc.
- PH adjusters such as aliphatic carboxylic acids, phenols, naphthols, benzoic acids, salicylic acids, and other aromatic organic acids; (h) phthalates, phosphate esters Plasticizers such as fatty acid esters, epoxidized soybean oil, castor oil, liquid paraffin alkyl polycyclic aromatic hydrocarbons; (i) waxes such as paraffin wax, microcrystalline wax, polymer wax, beeswax, whale wax low molecular weight polyolefin, etc.
- Non-reactive diluents such as benzyl alcohol, tar and pitumen
- Fillers such as acrylic resin powder and phenol resin powder
- M foaming agents
- dehydrating agents such as silane coupling agents, monoisocyanate compounds, carbodiimide compounds
- dehydrating agents such as silane coupling agents, monoisocyanate compounds, carbodiimide compounds
- dehydrating agents such as silane coupling agents, monoisocyanate compounds, carbodiimide compounds
- antistatic agents such as antistatic agents
- p antibacterial agents
- q antifungal agents
- r Contains a viscosity modifier;
- u a leveling agent
- v a sensitizer
- a dispersant a dispersant.
- Door can be.
- composition of the present invention suitably comprises component (A), component (B), polymerization initiator (C), and, if necessary, urethane (meth) acrylate, inorganic filler, polymerization inhibitor and other components.
- component (A) component (B)
- component (B) polymerization initiator
- C polymerization initiator
- urethane (meth) acrylate inorganic filler
- polymerization inhibitor and other components.
- a component (A), a component (B), and a polymerization initiator (C) may each be used individually by 1 type, and 2 or more types may be mixed and used for them.
- the ratio (a: b) of the number of allyl groups (a) of component (A) to the number of mercapto groups (b) of component (B) is preferably 30:70 to 70:30, more preferably Is mixed to 40:60 to 60:40.
- the total number (a ′) of allyl group of component (A) and (meth) acryloyloxy group of urethane (meth) acrylate and the number of mercapto groups of component (B) Mixing is performed so that the ratio (a ′: b) to (b) is preferably 30:70 to 70:30, more preferably 40:60 to 60:40.
- the method for preparing the composition of the present invention is not particularly limited as long as it is a method capable of mixing and dispersing the above components, and examples thereof include the following methods.
- a suitable container such as a glass beaker, a can, a plastic cup, or an aluminum cup with a stir bar or spatula.
- Each component is kneaded with a double helical ribbon blade, a gate blade, or the like.
- Each component is kneaded by a planetary mixer.
- Each component is kneaded by a bead mill.
- Each component is kneaded with three rolls.
- Each component is kneaded by an extruder type kneading extruder.
- Each component is kneaded by a rotating / revolving mixer.
- Addition and mixing of each component can be performed in an arbitrary order, and all components may be added simultaneously or sequentially.
- the above components are handled, mixed, and pre-cured under illumination through a filter that eliminates the absorption wavelength at which the photopolymerization initiator decomposes or without active energy rays. Or under a temperature at which the polymerization initiator (C) does not act before the curing treatment, such as at a temperature below the temperature at which the thermal polymerization initiator acts.
- a cured product is obtained by irradiating the composition of the present invention with active energy rays.
- Active energy rays used during curing include visible light; ultraviolet rays; microwaves; high frequencies; ionizing radiation such as electron beams, X-rays, ⁇ -rays, ⁇ -rays, and ⁇ -rays. Any energy species can be used as long as it can be released.
- a high pressure mercury lamp, a metal halide lamp, laser light, LED light, sunlight or the like can be used. Ultraviolet light is preferable because an inexpensive device is used.
- Various light sources can be used for curing the composition with ultraviolet rays.
- black light is a lamp that radiates only near-ultraviolet light of 300 to 430 nm (around 350 nm peak) by applying a near-ultraviolet phosphor on a special outer tube glass that cuts visible light and ultraviolet light of 300 nm or less.
- the UV-LED lamp is a lamp using a light emitting diode that emits ultraviolet rays.
- a black light, an LED lamp (UV-LED lamp) and a high-pressure mercury lamp are preferable because they are safe and economical.
- the irradiation amount of the active energy ray may be an amount sufficient for curing, and can be selected according to the composition of the composition, the amount used, the thickness, the shape of the cured product to be formed, and the like.
- the exposure dose is preferably 200 to 5,000 mJ / cm 2 , more preferably 1,000 to 3,000 mJ / cm 2 .
- the quantity can be adopted.
- a conventionally known method can be appropriately employed as a coating (coating) method, for example, a natural coater or a curtain flow coater.
- a coating (coating) method for example, a natural coater or a curtain flow coater.
- a sheet material is obtained by curing the composition into a sheet.
- the sheet material may contain other components other than the composition as necessary.
- the thickness of the sheet material may be appropriately set according to the use, but is preferably 0.1 to 10 mm, and more preferably 0.3 to 8 mm from the viewpoint of molding.
- seat material can be used conveniently also as an impact-absorbing material or a vibration-absorbing material.
- the shock absorbing material and the vibration absorbing material can be obtained by curing the composition.
- the light source, irradiation amount, and application (coating) method for curing the composition are as described above.
- the impact absorbing material and vibration absorbing material of the present invention may contain other components as needed, and may be laminated with other materials.
- building materials such as wood, concrete, mortar materials; thermoplastic resins such as PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate resin), epoxy resins, phenol resins, unsaturated polyester resins, etc.
- a resin material such as a thermosetting resin, glass, or a metal such as iron, aluminum, or copper.
- the composition of the present invention is applied to a mortar material and cured by irradiating UV light to obtain a mortar-cured product laminate.
- the composition of the present invention is cured into a sheet.
- thermoplastic resin such as PET, PC, PMMA
- D A laminated film in which a cured resin layer / thermoplastic resin layer obtained from the thermoplastic resin layer / the composition of the present invention is laminated in this order, and (e) a thermoplastic resin layer / adhesive layer / the composition of the present invention.
- F Thermoplastic resin layer / adhesive layer / hardened product layer / adhesive layer / thermoplastic resin obtained from the composition of the present invention.
- a laminated film laminated in the order of layers ( ) The composition of the present invention was applied to glass and cured by irradiating with UV light to form a glass laminate, (h) laminated in the order of glass / cured material layer / glass obtained from the composition of the present invention, (I) Applying the composition of the present invention between a thermoplastic resin or thermosetting resin and glass, and irradiating with UV light to form a laminate of glass and resin; (J) A material having a three-dimensional shape is coated with the composition of the present invention and cured to form a coating material, and (k) a cured product obtained from the composition of the present invention is printed. .
- the impact absorbability and the vibration absorbability are improved as compared with the case where the cured product is used alone.
- An ethylenically unsaturated group-containing compound (a) other than the component (A) (hereinafter sometimes referred to as “compound (a)”) 1) DAP: diallyl phthalate, manufactured by Daiso Co., Ltd., trade name “Daiso Dup Monomer”, molecular weight 246, allyl group number 2 2) TMPTA: Trimethylolpropane triacrylate, manufactured by Kyoeisha Chemical Co., Ltd., molecular weight 296, acryloyloxy group number 3 3) isoDAP: diallyl isophthalate, manufactured by Daiso Co., Ltd., trade name “Daiso Dup 100 monomer”, molecular weight 246, allyl group number 2 4) DATP: diallyl terephthalate, manufactured by Showa Denko KK, molecular weight 246, allyl group number 2 3.
- PE1 Pentaerythritol-tetrakis (3-mercaptobutyrate)
- PEMP Pentaerythritol-tetrakis (3-mercaptopropionate)
- PEMP Pentaerythritol-tetrakis (3-mercaptopropionate
- TPMB trimethylolpropane-tris (3-mercaptobutyrate)
- NR1 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione Karenz MT (trademark) NR1 ", molecular weight 568, mercapto group number 3 4).
- Table 1 shows the types of components (A) or compounds (a), components (B), polymerization initiators (C), polymerization inhibitors, and urethane (meth) acrylates and inorganic fillers as necessary.
- a polyethylene terephthalate (PET) film is placed on a glass plate, a silicon rubber spacer is sandwiched, and the obtained active energy ray-curable composition is poured so that the thickness after curing is 5 mm. And a glass plate was placed.
- PET polyethylene terephthalate
- UV light of 2 J / cm 2 was irradiated to obtain a cured product having a thickness of 5 mm.
- a silicone rubber spacer was sandwiched so that the thickness after curing was 1 mm and irradiated with UV light to obtain a cured product having a thickness of 1 mm. The following evaluation was performed using the obtained hardened
- the peak top of tan ⁇ was defined as A when the peak was 2 or more, B when 0.9 or more and less than 2, and C when less than 0.9.
- the temperature range that gives the peak top of tan ⁇ is 5 ° C or higher and lower than 30 ° C, A-5 ° C or higher and lower than 5 ° C, 30 ° C or higher and lower than 40 ° C, B, -5 ° C or lower than 40 ° C
- each component of the composition is part by mass.
- the functional group number ratio indicates (number of allyl groups or acryloyloxy groups of component (A) or compound (a)) / (number of mercapto groups of component (B)).
- component (A) and urethane (meth) acrylate are used in combination, ⁇ (number of allyl groups of component (A)) + (number of (meth) acryloyloxy groups of urethane (meth) acrylate) ⁇ / (Number of mercapto groups in component (B)).
- Examples 1 to 7 were all superior to Comparative Examples in impact absorption, vibration absorption, transparency and yellowness.
- the active energy ray-curable composition of the present invention gives a cured product that is excellent in transparency and excellent in impact absorption and vibration absorption, and the cured product obtained from the active energy ray-curable composition is particularly effective in impact. It is suitably used as an absorber and a vibration absorber.
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Abstract
Description
(1)成分(A):1,4-シクロヘキサンジカルボン酸ジアリル、
成分(B):メルカプト基を2個以上有する化合物、および
重合開始剤(C)を含む、活性エネルギー線硬化性組成物。
(2)前記成分(B)のすべてのメルカプト基が第二級炭素原子または第三級炭素原子に結合している、(1)に記載の活性エネルギー線硬化性組成物。
(3)前記成分(A)のアリル基の数と前記成分(B)のメルカプト基の数との比が、30:70~70:30の範囲内にあり、成分(A)と成分(B)との合計100質量部に対し前記重合開始剤(C)を0.01質量部~10質量部含む、(1)または(2)に記載の活性エネルギー線硬化性組成物。
(4)さらにウレタン(メタ)アクリレートを含む、(1)~(3)のいずれかに記載の活性エネルギー線硬化性組成物。
(5)前記成分(A)のアリル基およびウレタン(メタ)アクリレートの(メタ)アクリロイルオキシ基の総数と前記成分(B)のメルカプト基の数との比が、30:70~70:30の範囲内にあり、成分(A)と、ウレタン(メタ)アクリレートと、成分(B)との合計100質量部に対し、重合開始剤(C)を0.01質量部~10質量部含む、(4)に記載の活性エネルギー線硬化性組成物。
(6)さらに無機充填剤を含む、(1)~(5)のいずれかに記載の活性エネルギー線硬化性組成物。
(7)(1)~(6)のいずれかに記載の活性エネルギー線硬化性組成物が硬化した硬化物。
(8)(1)~(6)のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、衝撃吸収材。
(9)(1)~(6)のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、振動吸収材。
(10)(1)~(6)のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、シート材。
以下、本発明の組成物を構成する成分について説明する。
<成分(A)>
成分(A)は、1,4-シクロヘキサンジカルボン酸ジアリルであり、H-DATPなる製品名で昭和電工株式会社より入手可能である。成分(A)を用いることで、透明性を向上させることができる。
成分(B)は、メルカプト基に対してα位および/またはβ位の炭素原子が置換基を有するメルカプト基含有基を有することが望ましい。前記置換基の少なくとも一つはアルキル基であることが好ましい。
メルカプト基含有基としては、特に下記式(1)で示される基が好ましい。
成分(B)は、メルカプト基を2個以上有する化合物であれば、特に限定されないが、上述したメルカプト基含有基を2個以上有している多官能チオール化合物であることが好ましい。2個以上の前記メルカプト基含有基は、同じでも良く、また異なっていても良い。
成分(B)は、式(1)で表されるメルカプト基含有基が、以下に示す式(3)で表されるように、カルボン酸誘導体構造となっているものがより好ましい。
式(1)の構造を有するチオール化合物の具体例としては以下の化合物を挙げることができる。
エステル結合構造を含む化合物としては、フタル酸ジ(1-メルカプトエチルエステル)、フタル酸ジ(2-メルカプトプロピルエステル)、フタル酸ジ(3-メルカプトブチルエステル)、フタル酸ジ(3-メルカプトイソブチルエステル)などが例示できる。
成分(B)のうち、1級チオールおよび2級チオールを有する化合物は、市販品として容易に入手することもできる。市販品として入手可能な分子中に2個以上のメルカプト基を含有する1級チオール化合物としては、ペンタエリスリトール-テトラキス(3-メルカプトプロピオネート)(商品名:PEMP,堺化学(株)製)等が挙げられる。
重合開始剤(C)には、光重合開始剤と熱重合開始剤とがあるが、成分(A)の重合の開始を促進する化合物であれば、特に制限はない。
光重合開始剤としては、例えば、アセトフェノン、2,2-ジメトキシ-2-フェニルアセトフェノン、ジエトキシアセトフェノン、1-ヒドロキシシクロヘキシルフェニルケトン、1,2-ヒドロオキシ-2-メチル-1-フェニルプロパン-1-オン、α-ヒドロキシシクロヘキシルフェニルケトン、2-ヒドロキシ-2-メチル-1-フェニルプロパノン、2-ヒドロキシ-2-メチル-1-(4-イソプロピルフェニル)プロパノン、2-ヒドロキシ-2-メチル-1-(4-ドデシルフェニル)プロパノン、2-ヒドロキシ-2-メチル-1-[(2-ヒドロキシエトキシ)フェニル]プロパノン、ベンゾフェノン、2-メチルベンゾフェノン、3-メチルベンゾフェノン、4-メチルベンゾフェノン、4-メトキシベンゾフェノン、2-クロロベンゾフェノン、4-クロロベンゾフェノン、4-ブロモベンゾフェノン、2-カルボキシベンゾフェノン、2-エトキシカルボニルベンゾフェノン、4-ベンゾイル-4′-メチルジフェニルスルフィド、ベンゾフェノンテトラカルボン酸またはそのテトラメチルエステル、4,4′-ビス(ジアルキルアミノ)ベンゾフェノン類(例えば4,4′-ビス(ジメチルアミノ)ベンゾフェノン、4,4′-ビス(ジシクロヘキシルアミノ)ベンゾフェノン、4,4′-ビス(ジエチルアミノ)ベンゾフェノン、4,4′-ビス(ジヒドロキシエチルアミノ)ベンゾフェノン)、4-メトキシ-4′-ジメチルアミノベンゾフェノン、4,4′-ジメトキシベンゾフェノン、4-ジメチルアミノベンゾフェノン、4-ジメチルアミノアセトフェノン、ベンジル、アントラキノン、2-t-ブチルアントラキノン、2-メチルアントラキノン、フェナントラキノン、フルオレノン、2-ベンジル-2-ジメチルアミノ-1-(4-モルホリノフェニル)-1-ブタノン、2-(ジメチルアミノ)-2-[(4-メチルフェニル)メチル]-1-[4-(4-モルホリニル)フェニル]-1-ブタノン、2-メチル-1-[4-(メチルチオ)フェニル]-2-モルホリノ-1-プロパノン、2-ヒドロキシ-2-メチル-[4-(1-メチルビニル)フェニル]プロパノールオリゴマー、ベンゾイン、ベンゾインエーテル類(例えばベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインプロピルエーテル、ベンゾインイソプロピルエーテル、ベンゾインイソブチルエーテル、ベンゾインフェニルエーテル、ベンジルジメチルケタール)、アクリドン、クロロアクリドン、N-メチルアクリドン、N-ブチルアクリドン、N-ブチル-クロロアクリドン、2,4,6-トリメチルベンゾイルジフェニルホスフィンオキサイド、2,6-ジメトキシベンゾイルジフェニルホスフィンオキサイド、2,6-ジクロロベンゾイルジフェニルホスフィンオキサイド、2,4,6-トリメチルベンゾイルメトキシフェニルホスフィンオキサイド、2,4,6-トリメチルベンゾイルエトキシフェニルホスフィンオキサイド、2,3,5,6-テトラメチルベンゾイルジフェニルホスフィンオキサイド、ベンゾイルジ-(2,6-ジメチルフェニル)ホスホネート、1-[4-(フェニルチオ)フェニル]-1,2-オクタンジオン-2-(O-ベンゾイルオキシム)、1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]エタノン-1-(O-アセチルオキシム)、1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-3-シクロペンチルプロパノン-1-(O-アセチルオキシム)、1-[4-(フェニルチオ)フェニル]-3-シクロペンチルプロパン-1,2-ジオン-2-(O-ベンゾイルオキシム)が挙げられる。ビスアシルフォスフィンオキサイド類としては、ビス-(2,6-ジクロロベンゾイル)フェニルフォスフィンオキサイド、ビス-(2,6-ジクロロベンゾイル)-2,5-ジメチルフェニルフォスフィンオキサイド、ビス-(2,6-ジクロロベンゾイル)-4-プロピルフェニルフォスフィンオキサイド、ビス-(2,6-ジクロロベンゾイル)-1-ナフチルフォスフィンオキサイド、ビス-(2,6-ジメトキシベンゾイル)フェニルフォスフィンオキサイド、ビス-(2,6-ジメトキシベンゾイル)-2,4,4-トリメチルペンチルフォスフィンオキサイド、ビス-(2,6-ジメトキシベンゾイル)-2,5-ジメチルフェニルフォスフィンオキサイド、ビス-(2,4,6-トリメチルベンゾイル)フェニルフォスフィンオキサイド、(2,5,6-トリメチルベンゾイル)-2,4,4-トリメチルペンチルフォスフィンオキサイド、2-イソプロピルチオキサントン、4-イソプロピルチオキサントン、2,4-ジエチルチオキサントン、2,4-ジクロロチオキサントン、1-クロロ-4-プロポキシチオキサントンなどが挙げられる。
また、本発明の組成物にウレタン(メタ)アクリレートを含む場合は、重合開始剤(C)の含有量は、化合物(A)と、ウレタン(メタ)アクリレートと、化合物(B)との合計100質量部に対して、0.01~10質量部が好ましく、0.5~5.0質量部がより好ましい。
重合開始剤(C)は、1種を単独で用いることも、2種以上を任意の割合で組み合わせて用いることもできる。
本発明の活性エネルギー線硬化性組成物は、本発明の目的を損なわない範囲で、ウレタン(メタ)アクリレートを含んでもよい。なお、本明細書において、「ウレタン(メタ)アクリレート」とは、ウレタンアクリレートおよびウレタンメタクリレートの総称である。
ウレタン(メタ)アクリレートは、1種を単独で用いることも、2種以上を任意の割合で組み合わせて用いることもできる。
ウレタン(メタ)アクリレートの配合量は、特に限定されないが、成形性の観点から、前記組成物の総質量の10~60質量%が好ましく、20~40質量%がより好ましい。
本発明の活性エネルギー線硬化性組成物は、本発明の目的を損なわない範囲で、無機充填剤を含んでもよい。
本発明の活性エネルギー線硬化性組成物は、組成物としての保存安定性を向上させるために必要に応じて重合禁止剤を添加してもよい。
本発明の活性エネルギー線硬化性組成物は、上述した成分(A)、成分(B)および重合開始剤(C)に加えて、必要に応じて、ウレタン(メタ)アクリレート、無機充填剤および重合禁止剤から選ばれる少なくとも1種を加えてもよく、さらに本発明の目的を損なわない範囲でその他の成分を任意成分として含有していてもよい。ただし、耐衝撃性等の観点から、本発明の組成物中には、1分子中にエチレン性不飽和基およびイソシアネート基を有する化合物は用いないことが好ましい。例えば、発明の効果を損なわない範囲で成分(B)以外のメルカプト化合物を配合してもよい。ただし、成分(B)以外のメルカプト化合物の配合量は、衝撃吸収性、透明性、低臭特性等の維持の観点から、全メルカプト化合物の20質量%以下であることが好ましい。
その他の成分として好ましく添加されるものとしては、例えば、炭素材料、顔料、染料などの色材が挙げられる。
顔料としては、例えば、鉄黒、アニリンブラック、シアニンブラック、チタンブラックなどの黒色顔料が挙げられる。また、本発明の組成物は、赤色、緑色、青色などの有機顔料を含有してもよい。市販されているジェルネイルまたはUVクラフト用の顔料を用いてもよく、このような顔料としては、例えば、ピカエース着色顔料(701、731、741、755、762)、透明顔料(900、901、910、920、921、922、924、930、932、941、942、945、947、950、955、957、960、963、968、970、980、981、982、985)が挙げられる。
本発明の組成物における、色材の含有量は、特に限定されないが、濃度が濃すぎると、活性エネルギー線の透過率が低下して硬化不良を起こす可能性がある。そのため、色材の含有量は、前記組成物中に、通常、60質量%以下、好ましくは0.0001~40質量%である。
本発明の組成物は、成分(A)、成分(B)、重合開始剤(C)、ならびに、必要に応じてウレタン(メタ)アクリレート、無機充填剤、重合禁止剤およびその他の成分を適宜配合して調製することができる。
このとき、成分(A)のアリル基の数(a)と成分(B)のメルカプト基の数(b)との比(a:b)が、好ましくは30:70~70:30、より好ましくは40:60~60:40となるように混合する。
尚、ウレタン(メタ)アクリレートを配合する場合には、成分(A)のアリル基およびウレタン(メタ)アクリレートの(メタ)アクリロイルオキシ基の総数(a’)と成分(B)のメルカプト基の数(b)との比(a’:b)が、好ましくは30:70~70:30、より好ましくは40:60~60:40となるように混合する。
(i)各成分をガラスビーカー、缶、プラスチックカップ、アルミカップ等の適当な容器中にて、撹拌棒、へら等により混練する。
(ii)各成分をダブルヘリカルリボン翼、ゲート翼等により混練する。
(iii)各成分をプラネタリーミキサーにより混練する。
(iv)各成分をビーズミルにより混練する。
(v)各成分を3本ロールにより混練する。
(vi)各成分をエクストルーダー型混練押し出し機により混練する。
(vii)各成分を自転・公転ミキサーにより混練する。
重合開始剤(C)を使用する際には、上記成分の取扱や混合、硬化前処理までを、光重合開始剤が分解する吸収波長を削除するフィルターを通した照明下若しくは活性エネルギー線非照射化、又は、熱重合開始剤が作用する温度以下で行うなど、硬化処理以前に重合開始剤(C)が作用しない条件下で行うことができる。
本発明の組成物に対し、活性エネルギー線を照射することで硬化物が得られる。
硬化時に使用する活性エネルギー線としては、可視光;紫外線;マイクロ波;高周波;電子線、X線、α線、β線、γ線のような電離放射線等をいうが、重合を開始させる物質を放出させることが可能ならばいかなるエネルギー種でも良い。例えば紫外~可視光の場合には、高圧水銀ランプ、メタルハライドランプやレーザー光、LED光、太陽光などが利用できる。安価な装置を使用することから、紫外線が好ましい。
前記シート材の厚みは、用途に応じ適宜設定すればよいが、好ましくは0.1~10mmであり、成形の観点からより好ましくは0.3~8mmである。
衝撃吸収材および振動吸収材は、前記組成物を硬化させることで得られる。前記組成物を硬化させる際の光源、照射量および塗布(塗工)方法は、前述の通りである。
<化合物>
実施例1~7および比較例1~4で用いた化合物は、次のとおりである。
1.成分(A)
1)H-DATP:1,4-シクロヘキサンジカルボン酸ジアリル
昭和電工社製、商品名「H-DATP」、分子量252、アリル基数2
2.成分(A)以外のエチレン性不飽和基含有化合物(a)(以降、「化合物(a)」と称することがある。)
1)DAP:フタル酸ジアリル
ダイソー社製、商品名「ダイソーダップモノマー」、分子量246、アリル基数2
2)TMPTA:トリメーチロールプロパントリアクリレート
共栄社化学製、分子量296、アクリロイルオキシ基数3
3)isoDAP:イソフタル酸ジアリル
ダイソー社製、商品名「ダイソーダップ100モノマー」、分子量246、アリル基数2
4)DATP:テレフタル酸ジアリル
昭和電工社製、分子量246、アリル基数2
3.成分(B)
1)PE1:ペンタエリスリトール-テトラキス(3-メルカプトブチレート)
昭和電工社製、商品名「カレンズMT(商標)PE1」、分子量545、メルカプト基数4
2)PEMP:ペンタエリスリトール-テトラキス(3-メルカプトプロピオネート)
堺化学社製、商品名「PEMP」、分子量489、メルカプト基数4
3)TPMB:トリメチロールプロパン-トリス(3-メルカプトブチレート)
昭和電工社製、商品名「TPMB」、分子量441、メルカプト基数3
4)NR1:1,3,5-トリス(3-メルカプトブチルオキシエチル)-1,3,5-トリアジン-2,4,6(1H,3H,5H)-トリオン
昭和電工社製、商品名「カレンズMT(商標)NR1」、分子量568、メルカプト基数3
4.重合開始剤(C)
1-ヒドロキシ-シクロヘキシル-フェニルケトン
BASF社製、商品名「Irgacure184」
5.重合禁止剤
メチルヒドロキノン、関東化学社製
6.ウレタンアクリレート
UA-160TM:新中村化学社製、アクリロイルオキシ基数2
表1に示す種類の成分(A)または化合物(a)、成分(B)、重合開始剤(C)、重合禁止剤、ならびに、必要に応じてウレタン(メタ)アクリレートおよび無機充填剤を表1に示す質量比で混合して活性エネルギー線硬化性組成物とした。次いで、ガラス板上にポリエチレンテレフタラート(PET)フィルムを載せ、シリコンゴムスペーサーを挟み、得られた活性エネルギー線硬化性組成物を硬化後の厚みが5mmになるように注ぎ込み、その上にPETフィルムおよびガラス板を載せた。アイグラフィックス社製のコンベア型UV照射機ECS-4011GX(高圧水銀ランプ)を用いて2J/cm2のUV光を照射し、厚み5mmの硬化物を得た。また、同様にして硬化後の厚みが1mmになるようにシリコンゴムスペーサーを挟みUV光を照射し、厚さ1mmの硬化物を得た。
得られた硬化物を用い、以下の評価を行った。
得られた厚さ5mmの硬化物を水平な鉄板上に静置し、60gの鋼球を硬化物の表面から60cmの高さより自由落下させ、硬化物と衝突後の跳ね返りの高さを測定した。跳ね返り高さが7.5cm未満のものをA、7.5cm以上15cm未満のものをB、15cm以上のものをCと評価した。
得られた厚み1mmの硬化物を10mm×40mmの大きさにカットした試験片を用い、エスアイアイ・ナノテクノロジー社製動的粘弾性試験器DMS6100にて、測定周波数10Hz、昇温速度3℃/minの条件で、tanδの値と、tanδのピークトップを与える温度を測定した。tanδの値が大きいほど振動吸収性に優れるので、室温付近での振動吸収性の発現には、室温付近にピークトップが存在することが有効である。そこで、tanδのピークトップおよびtanδのピークトップを与える温度域を以下のように評価した。
tanδのピークトップを与える温度域が、5度以上30度未満のものをA、-5度以上5度未満、または30度以上40度未満のものをB、-5度未満または40度以上のものをCとした。
得られた厚さ1mmの硬化物の濁度を、日本電飾社製ヘイズメーターNDH-5000にて測定した。ヘイズが大きいほど濁度が高いことを示す。ヘイズが0.5未満のものをA、0.5以上1未満のものをB、1以上のものをCと評価した。
得られた厚さ1mmの硬化物の黄色みを、日本電飾社製色差計SD6000にて測定した。b*値が大きいほど黄色みが強いことを示す。b*値が0.5未満のものをA、0.5以上1未満のものをB、1以上のものをCと評価した。
表1の結果から明らかなように、実施例1~7は衝撃吸収性、振動吸収性、透明性および黄色みのすべてが比較例よりも優れていた。
Claims (10)
- 成分(A):1,4-シクロヘキサンジカルボン酸ジアリル、
成分(B):メルカプト基を2個以上有する化合物、および
重合開始剤(C)を含む、活性エネルギー線硬化性組成物。 - 前記成分(B)のすべてのメルカプト基が第二級炭素原子または第三級炭素原子に結合している、請求項1に記載の活性エネルギー線硬化性組成物。
- 前記成分(A)のアリル基の数と前記成分(B)のメルカプト基の数との比が、30:70~70:30の範囲内にあり、成分(A)と成分(B)との合計100質量部に対し前記重合開始剤(C)を0.01質量部~10質量部含む、請求項1または2に記載の活性エネルギー線硬化性組成物。
- さらにウレタン(メタ)アクリレートを含む、請求項1~3のいずれかに記載の活性エネルギー線硬化性組成物。
- 前記成分(A)のアリル基およびウレタン(メタ)アクリレートの(メタ)アクリロイルオキシ基の総数と前記成分(B)のメルカプト基の数との比が、30:70~70:30の範囲内にあり、成分(A)と、ウレタン(メタ)アクリレートと、成分(B)との合計100質量部に対し、重合開始剤(C)を0.01質量部~10質量部含む、請求項4に記載の活性エネルギー線硬化性組成物。
- さらに無機充填剤を含む、請求項1~5のいずれかに記載の活性エネルギー線硬化性組成物。
- 請求項1~6のいずれかに記載の活性エネルギー線硬化性組成物が硬化した硬化物。
- 請求項1~6のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、衝撃吸収材。
- 請求項1~6のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、振動吸収材。
- 請求項1~6のいずれかに記載の活性エネルギー線硬化性組成物が硬化した、シート材。
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