WO2014181609A1 - 画像表示装置用のダム材組成物、及びそれを用いた画像表示装置 - Google Patents
画像表示装置用のダム材組成物、及びそれを用いた画像表示装置 Download PDFInfo
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- WO2014181609A1 WO2014181609A1 PCT/JP2014/059357 JP2014059357W WO2014181609A1 WO 2014181609 A1 WO2014181609 A1 WO 2014181609A1 JP 2014059357 W JP2014059357 W JP 2014059357W WO 2014181609 A1 WO2014181609 A1 WO 2014181609A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
- C08L2312/06—Crosslinking by radiation
Definitions
- the present invention relates to a dam material composition for an image display device and an image display device using the same.
- a flat panel type image display device usually has a large number of pixels composed of a semiconductor layer, a phosphor layer, or a light emitting layer constituting an active element between a pair of light-transmitting substrates such as glass. It has a display area (image display portion) arranged in a matrix. Generally, the periphery of this display area (image display portion) and a protective portion formed of optical plastic such as glass or acrylic resin is sealed secretly with an adhesive.
- a sealant is interposed between the protection unit and the image display unit in order to prevent a reduction in visibility (visibility) due to reflection of outdoor light or indoor lighting.
- an ultraviolet curable silicone resin composition is used as the sealant (Patent Document 1), and the use of a thermosetting silicone resin composition has also been proposed (Patent Document 2).
- an epoxy resin composition may be used for the sealant (Patent Document 3).
- the above ultraviolet curable resin composition when used as an encapsulant in an image display part (for example, a liquid crystal display panel), the composition may protrude from the display part or on the back side of the display part due to its fluidity. Problems such as enveloping may occur, and in recent years when the display portion has become larger, it has become more apparent.
- a method of preventing a protrusion or the like by forming a frame using a dam material composition in advance on the display unit or the protection unit and applying the composition therein is known. ing.
- Patent Document 3 discloses that a dam material is obtained by adding fine silica to an epoxy resin composition as a sealant. However, Patent Document 3 does not describe the hardness and adhesiveness of the cured product of the dam material. Further, Patent Document 3 describes nothing about applying other resin-based sealants as dam materials. Although the dam material is used in the Example of patent document 2, the detail of the composition is not clear. Moreover, although it hardens
- An object of the present invention is to provide a silicone-based dam material composition whose cured product has an appropriate hardness and adhesion to an adherend as a dam material, and an image display device using the same. More preferably, in addition to this, a clear seam is generated between the frame of the dam material and the sealant therein, and the problem that visibility as an image display device may be reduced, It is an object of the present invention to provide a dam material composition and an image display device using the dam material composition that make it difficult to distinguish a joint.
- the present invention 1 relates to (A) a polyorganosiloxane containing a mercaptoalkyl group bonded to a silicon atom and having a viscosity of 20 to 25000 cP at 23 ° C .; (B) (B1) Formula (I): (Where R 1 is independently an aliphatic unsaturated group; R is independently a C1-C6 alkyl group or a C6-C12 aryl group, and 1-60 mol% of R is a C6-C12 aryl group, and n is a linear polyorganosiloxane containing an aliphatic unsaturated group, represented by the viscosity at 23 ° C.
- R ' are each independently, C1 ⁇ C6 alkyl group Or a branched polyorganosiloxane having at least three R's each of which is an aliphatic unsaturated group, and a polyorgano having an aliphatic unsaturated group.
- Siloxane Siloxane; (C) a photoinitiator; (D) a silane compound containing an aliphatic unsaturated group; and (E) fumed silica having a BET specific surface area of 180-500 m 2 / g, wherein The ratio of the number of mercaptoalkyl groups present in (A) to the total number of aliphatic unsaturated groups in (B) and (D) is 0.45 to 1.50, Dam material for an image display device in which (E) is 0.5 to 24 parts by weight with respect to 100 parts by weight of (B) and the viscosity at 23 ° C. is 20,000 to 10,000,000 cP Relates to the composition.
- the present invention 2 is the image display device of the present invention 1, wherein the ratio of the number of mercaptoalkyl groups in (A) to the number of aliphatic unsaturated groups in (B) is 0.5 to 4.0.
- the present invention relates to a dam material composition.
- Invention 3 is an image according to Invention 1 or 2, wherein the ratio of the number of mercaptoalkyl groups in (A) to the number of aliphatic unsaturated groups in (D) is 1.2 to 3.5.
- the present invention relates to a dam material composition for a display device.
- the present invention 4 relates to the dam material composition for an image display device according to any one of the present inventions 1 to 3, wherein (E) is fumed silica having a BET specific surface area of 300 to 500 m 2 / g.
- the present invention 5 uses the B-type rotational viscometer for the dam material composition, and the viscosity (cP) measured at 23 ° C. and 6 rpm is measured at V 6 rpm and 23 ° C. and 12 rpm .
- the present invention 6 is the dam material composition for an image display device according to any one of the present invention 1 to 5, wherein the content of (C) is 0.05 to 50 parts by weight with respect to 100 parts by weight of (B) Related to things.
- (D) is one or more aliphatic non-volatile compounds selected from the group consisting of 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane.
- the present invention relates to a dam material composition for an image display device according to any one of the present inventions 1 to 6, which is a silane compound containing a saturated group.
- the present invention 8 relates to an image display device comprising the dam material composition for an image display device according to any one of the present inventions 1 to 7 for sealing the image display portion and the protective portion.
- the present invention is a dam material composition, and when an image display device is produced using the dam material composition, the frame formed from the dam material composition has an appropriate hardness and adhesion to an adherend. is there. More preferably, it is difficult to distinguish a seam between the frame of the dam material and the sealant therein, and an image display device having good visibility can be provided.
- the dam material composition for the image display device of the present invention is (A) a polyorganosiloxane containing a mercaptoalkyl group bonded to a silicon atom, having a viscosity at 23 ° C. of 20 to 25000 cP; (B) (B1) Formula (I):
- R 1 is independently an aliphatic unsaturated group; R is independently a C1-C6 alkyl group or a C6-C12 aryl group, and 1-60 mol% of R is a C6-C12 aryl group, and n is a linear polyorganosiloxane containing an aliphatic unsaturated group, represented by the viscosity at 23 ° C. of 100 to 1,000,000 cP) and optionally (B2) SiO 4/2 Units, R ′ 3 SiO 1/2 units and R ′ 2 SiO 2/2 units, and optionally further R′SiO 3/2 units wherein R ′ is independently a C1-C6 alkyl group.
- a branched polyorganosiloxane having at least three R's each of which is an aliphatic unsaturated group, and a polyorgano having an aliphatic unsaturated group.
- composition of the present invention comprises (A) a polyorganosiloxane containing a mercaptoalkyl group bonded to a silicon atom and having a viscosity of 20 to 25000 cP at 23 ° C.
- the number of mercaptoalkyl groups bonded to silicon atoms in one molecule is, on average, 2 or more and 20 from the viewpoint of suppressing excessive curing shrinkage while ensuring a stable structure by a crosslinking reaction. It can be as follows. Among these, more than 2, preferably 10 or less, more preferably 3-7.
- the alkyl portion of the mercaptoalkyl group bonded to the silicon atom can be a C1-C6 alkyl group.
- the mercaptoalkyl group include mercaptomethyl, 2-mercaptoethyl, 3-mercaptopropyl, 4-mercaptobutyl, 6-mercaptohexyl and the like. From the viewpoint of ease of synthesis, mercaptomethyl, 3-mercaptopropyl, etc. Is preferred, and 3-mercaptopropyl is more preferred.
- the organic group other than the mercaptoalkyl group bonded to the silicon atom can be a substituted or unsubstituted monovalent hydrocarbon group (provided not to be an aliphatic unsaturated group).
- an alkyl group such as a C1-C6 alkyl group (eg, methyl, ethyl, propyl, etc.); a cycloalkyl group, eg, a C3-C10 cycloalkyl group (eg, cyclohexyl, etc.); an aryl group, eg, C6-C12 Aryl groups (eg, phenyl, tolyl, xylyl, etc.); aralkyl groups, eg, C7-C13 aralkyl groups (eg, 2-phenylethyl, 2-phenylpropyl, etc.); substituted hydrocarbon groups, eg, halogen-substituted hydrocarbon groups (eg, halogen-sub
- An alkyl group is preferable from the viewpoint of easiness of synthesis, etc. Among them, methyl, ethyl and propyl are preferable, and methyl is more preferable. In order to adjust the refractive index, an aryl group can be used in combination, and among them, phenyl is preferable from the viewpoint of ease of synthesis.
- the structure of the main chain of (A) may be linear, branched or cyclic, and is preferably branched.
- R ′′ SiO 3/2 units, R ′′ 3 SiO 1/2 units and R ′′ 2 SiO 2/2 units, and optionally further SiO 4/2 units (where R ′′ is Each independently composed of an unsubstituted or substituted monovalent hydrocarbon group (provided not to be an aliphatic unsaturated group), 2 or more and 20 or less R ′ per molecule
- Examples thereof include branched polyorganosiloxanes containing mercaptoalkyl groups, wherein 'is a mercaptoalkyl group.
- Examples of the mercaptoalkyl group and the unsubstituted or substituted monovalent hydrocarbon group include the groups described above.
- R ′′ which is a mercaptoalkyl group may be present as R ′′ of any unit, but is preferably present as R ′′ of R ′′ SiO 3/2 unit.
- the mercaptoalkyl group and the unsubstituted or substituted monovalent hydrocarbon group the above groups can be applied. From the viewpoint of workability and crosslinking reactivity, the ratio of the number of siloxane units containing a mercaptoalkyl group to the number of siloxane units containing no mercaptoalkyl group is preferably 1:60 to 1: 5, but is not limited thereto. .
- the viscosity at 23 ° C. is 20 to 25000 cP. From the viewpoint of workability and refractive index, for example, the viscosity can be 30 to 23000 cP. From the viewpoint of compatibility and workability, the viscosity at 23 ° C. can be, for example, 20 to 2000 cP, and more preferably 50 to 500 cP.
- the viscosity is measured with a B-type rotational viscometer (Bismetron VDA-L) (manufactured by Shibaura System Co., Ltd.). Use values 2 to 4, and use the values measured at 30 to 60 rpm and 23 ° C. (However, if there is a separate description regarding the number of revolutions, follow it).
- the number of mercapto groups in (A) can be measured by colorimetric titration with iodine. This is the following formula: 2RSH + I 2 ⁇ RSSR + 2HI This method utilizes the fact that the titration solution becomes slightly yellow with a small amount of excess iodine during titration.
- (A) is preferably highly transparent.
- As an index of transparency at 23 ° C., when (A) was filled in a container, and the transmittance in the visible light region wavelength (360 to 780 nm) was measured with a spectrophotometer for a thickness of 10 mm, It is mentioned that the transmittance is 80% or more.
- the transmittance is preferably 90% or more from the viewpoint that the transparency of the cured product of the composition of the present invention can be stably maintained.
- the method for preparing (A) is not particularly limited.
- alkylchlorosilane such as silane, mercaptoalkylalkoxysilane, and a desired alkylchlorosilane, alkylalkoxysilane, or silanol-containing siloxane.
- (A) may be used alone or in combination of two or more.
- composition of the present invention comprises (B) (B1) formula (I):
- R 1 is independently an aliphatic unsaturated group; R is independently a C1-C6 alkyl group or a C6-C12 aryl group, and 1-60 mol% of R is a C6-C12 aryl group, and n is a linear polyorganosiloxane containing an aliphatic unsaturated group, represented by the viscosity at 23 ° C. of 100 to 1,000,000 cP) and optionally (B2) SiO 4/2 Units, R ′ 3 SiO 1/2 units and R ′ 2 SiO 2/2 units, and optionally further R′SiO 3/2 units wherein R ′ is independently a C1-C6 alkyl group. Or a branched polyorganosiloxane having at least three R's each of which is an aliphatic unsaturated group, and a polyorgano having an aliphatic unsaturated group. Contains siloxane.
- (B2) is an optional component and can be blended for the purpose of adjusting the hardness of the cured product.
- (B2) is the total number of aliphatic unsaturated groups in (B). It can be used in such an amount that the ratio of the number of aliphatic unsaturated groups in (B2) is 20 to 85%.
- the ratio of the number of aliphatic unsaturated groups in (B2) is preferably more than 50% from the viewpoint of fast curability, and can be, for example, 60 to 85%, more preferably 65 to 85%. .
- R 1 is an aliphatic unsaturated group.
- R 1 at both ends may be the same or different, but is preferably the same.
- Examples of the aliphatic unsaturated group include alkenyl groups such as C2 to C6 alkenyl groups (eg, vinyl, propenyl, butenyl, hexenyl, etc.).
- alkenyl groups such as C2 to C6 alkenyl groups (eg, vinyl, propenyl, butenyl, hexenyl, etc.).
- An alkenyl group having an unsaturated terminal is more preferable, and a vinyl group is preferable from the viewpoint of ease of synthesis.
- R is a C1-C6 alkyl group (for example, methyl, ethyl, propyl, etc.) or a C6-C12 aryl group (for example, phenyl, tolyl, xylyl, etc.). R may be the same or different.
- 1 to 60 mol% of R is a C6 to C12 aryl group
- 1 to 50 mol% of R is a C6 to C12 aryl group. It is preferably 1 to 35 mol%.
- the C1-C6 alkyl group is preferably methyl, and the C6-C12 aryl group is preferably phenyl.
- 1 to 60 mol% of R is preferably a phenyl group and the remainder is a methyl group, and more preferably 1 to 50 mol% of R.
- (B1) has a viscosity at 23 ° C. of 100 to 1,000,000 cP, more preferably 1000 to 1,000,000 cP, and more preferably 3000 to 500,000 cP from the viewpoint of workability of the composition.
- Those having a high viscosity are not preferable because an unnecessarily high value is not preferable because the remaining material remains in the form of a thread from the tip of the discharge port after application of the composition, and the member is easily soiled when the tip is moved.
- a particularly preferred viscosity range is 15,000 to 300,000 cP.
- the number of aliphatic unsaturated groups in (B1) can be determined from the molecular weight obtained by calculating the average structural formula by NMR, calculating the molecular weight.
- the method for preparing (B1) is not particularly limited, and for example, polycondensation and re-equilibration of chlorosilanes necessary for a desired structure such as dimethyldichlorosilane, diphenyldichlorosilane, methylphenyldichlorosilane, dimethylvinylchlorosilane, and the like is performed. Alternatively, it can be obtained by cohydrolyzing alkoxysilanes necessary for a desired structure such as dimethyldimethoxysilane, diphenyldimethoxysilane, methylphenyldimethoxysilane, dimethylvinylmethoxy, etc., and performing polycondensation and re-equilibration reactions.
- 1,1,3,3,5,5,7,7-octamethylcyclotetrasiloxane, 1,1,3,3,5,5,7,7-octaphenylcyclotetrasiloxane, 1,1,3 Siloxanes necessary for a desired structure such as 3,3-tetramethyl-1,3-divinyldisiloxane are converted to alkali catalysts (alkali metal hydroxides, alkali metal silanolates, ammonium hydroxides, etc.) or acid catalysts (sulfuric acid). , Silanolate sulfate, trifluoromethanesulfonic acid) in the presence of ring-opening polymerization and re-equilibration.
- (B1) may be used alone or in combination of two or more.
- (B2) is SiO 4/2 unit, R ′ 3 SiO 1/2 unit and R ′ 2 SiO 2/2 unit, and optionally further R′SiO 3/2 unit (wherein R ′ is It is a branched polyorganosiloxane consisting of a C1-C6 alkyl group or an aliphatic unsaturated group and having at least 3 R's per molecule as an aliphatic unsaturated group.
- (B2) is a branched structure having a ratio of 6 to 10 moles of SiO 4/2 units and 4 to 8 moles of R ′ 3 SiO 1/2 units to 1 mole of R ′ 2 SiO 2/2 units.
- Polyorganosiloxane is mentioned.
- (B2) is preferably a solid or viscous semi-solid resinous or liquid at room temperature. Examples include those having a weight average molecular weight of 1,000 to 400,000, and preferably 2,000 to 200,000. The weight average molecular weight is a value obtained by using polystyrene as a calibration curve by gel permeation chromatography (GPC).
- Examples of the aliphatic unsaturated group relating to R ′ include the groups listed as the aliphatic unsaturated group in (B1), and specifically include alkenyl groups such as C2 to C6 alkenyl groups (eg, vinyl, propenyl, butenyl). Hexenyl, etc.). An alkenyl group having an unsaturated terminal is more preferable, and a vinyl group is preferable from the viewpoint of ease of synthesis.
- R ′ which is an aliphatic unsaturated group may be present as R ′ of any unit, but is preferably present as R ′ of the R ′ 2 SiO unit.
- R ′ other than the aliphatic unsaturated group is a C1-C6 alkyl group (for example, methyl, ethyl, propyl, etc.), and a methyl group is preferable in consideration of heat resistance.
- (B2) when used, it may be used alone or in combination of two or more.
- the composition of the present invention includes (C) a photoreaction initiator.
- C) is a component that functions as a radical initiator or a sensitizer when photocrosslinking (A) and (B).
- C) is an aromatic hydrocarbon, acetophenone and derivatives thereof, benzophenone and derivatives thereof, o-benzoylbenzoic acid ester, benzoin and benzoin ether and derivatives thereof, xanthone and derivatives thereof, disulfide compounds, quinones.
- Examples include compounds, halogenated hydrocarbons and amines, and organic peroxides. From the viewpoint of compatibility with silicone and stability, a compound or an organic peroxide containing a substituted or unsubstituted benzoyl group is more preferable.
- Examples of (C) include acetophenone, propiophenone, 2-hydroxy-2-methylpropiophenone, 2,2-dimethoxy-1,2-diphenylethane-1-one (IRGACUREC651: manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl-propan-1-one (DAROCUR 1173: manufactured by BASF), 1-hydroxy-cyclohexyl-phenyl-ketone (IRGACURE 184: manufactured by BASF), 1- [4- ( 2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (IRGACUREGA2959, manufactured by BASF), 2-hydroxy-1- ⁇ 4- [4- (2-hydroxy- 2-methyl-propionyl) -benzyl] phenyl ⁇ -2-methyl-propan-1-one (IRGACURE® 127: manufactured by BASF), 2-methyl-1- (4-methyl Thiophenyl) -2-morpholinopropan-1-one (IRGACURE 907: manufactured by
- (C) may be used alone or in combination of two or more.
- the composition of the present invention includes (D) a silane compound containing an aliphatic unsaturated group.
- (D) plays the role which improves the adhesiveness and adhesiveness to the base material of hardened
- the aliphatic unsaturated group include the groups listed as the aliphatic unsaturated group in (B1), specifically, alkenyl groups such as C2 to C6 alkenyl groups (for example, vinyl, propenyl, butenyl, hexenyl, etc.) ).
- An alkenyl group having an unsaturated terminal is more preferable, and a vinyl group is preferable from the viewpoint of ease of synthesis.
- Examples of (D) include 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, preferably 3-methacryloxypropyltriethoxysilane, 3- Methacryloxypropyltrimethoxysilane.
- (D) may be used alone or in combination of two or more.
- the composition of the present invention contains (E) fumed silica having a BET specific surface area of 180 to 500 m 2 / g.
- a viscosity suitable for dam formation can be obtained, and thixotropy can be imparted.
- the composition of the present invention has a high viscosity of 20,000 cP or more, and generally there is a concern that the wettability is lowered and the adhesiveness of the cured product is poor. Nevertheless, by properly blending the component (E), the cured product of the composition of the present invention exhibits good adhesiveness, but the blend of (E) contributes to this. I understood.
- the BET specific surface area of the fumed silica is 180 to 500 m 2 / g.
- a material in this range it is possible to impart the necessary thixotropy to the composition in a small amount, and accordingly, a composition with higher transparency can be easily obtained.
- From the viewpoint of transparency it is preferably 200 to 500 m 2 / g, and more preferably 300 to 500 m 2 / g.
- the load is applied to the kneading operation and the like on the preparation method, since the appearance tends to lump of stones or the like tends to occur flame, 500 meters 2 / g or less of those Is preferred.
- the fumed silica includes not only the surface-treated fumed silica but also the surface-treated fumed silica.
- the surface treatment can improve compatibility and increase the thixotropy.
- Examples of the surface treatment include treatment with chlorosilane (methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, etc.), alkoxysilane, hexamethyldisilazane, octamethylcyclotetrasiloxane, dimethylsiloxane oligomer, and the like.
- treatment with hexamethyldisilazane is preferable from the viewpoint of transparency.
- These surface treatment agents may be blended with kneaded silica at the time of preparation of the composition of the present invention, and kneaded to perform silica surface treatment.
- (E) may be used alone or in combination of two or more.
- the number of mercaptoalkyl groups bonded to the silicon atom in (A) is HS
- the number of aliphatic unsaturated groups in (B) is ViB
- the number of aliphatic unsaturated groups in (D) is ViD.
- the ratio of HS to ViB + ViD (HS / (ViB + ViD)) is 0.45 to 1.50, preferably 0.50 to 1.30 from the viewpoint of imparting appropriate hardness and elasticity to the cured product. More preferably, it is 0.60 to 1.20.
- the number of aliphatic unsaturated groups in (B) is equal to the number of aliphatic unsaturated groups ViB1 in (B1), while (B1) and When (B2) is used in combination, the number of aliphatic unsaturated groups in (B) is the number of aliphatic unsaturated groups ViB1 in (B1) and the number of aliphatic unsaturated groups in (B2) ViB2. It becomes the sum of.
- the ratio of HS to ViB is preferably 0.5 to 3.5, 0.95 Is more preferably 3, and more preferably 1-2.
- the ratio of HS to ViD is preferably 1.2 to 3.5 in terms of good adhesion and further improvement in suppression of temperature change of the cured product, preferably 1.5 to 3. More preferably, it is 1.8 to 2.5.
- (C) is preferably 0.05 to 50 parts by weight with respect to (B) 100 parts by weight. More preferably, it is 0.1 to 40 parts by weight.
- (E) can be used in an amount of 0.5 to 24 parts by weight with respect to 100 parts by weight of (B). From the viewpoint of improving adhesion to a substrate, (E) is 1 to 23 parts by weight. Part by weight, preferably 5 to 20 parts by weight.
- the total amount of (A) to (E) is preferably 55% by weight or more, more preferably 75% by weight or more, and still more preferably 90% in the composition. % By weight or more.
- the composition of the present invention preferably further contains (F) a silicone resin adhesion improver (however, (A), (B) and (D) are excluded).
- the silicone resin adhesion improver refers to a silicone resin having tackiness, and is blended as necessary in order to further strengthen and stabilize the adhesive property of the ultraviolet curable silicone resin composition of the present invention. In particular, when the adherend is a polarizing plate, a high improvement effect can be expected.
- (F) includes at least one silicone resin selected from the group consisting of MQ resin, MDQ resin, MT resin, MDT resin, MDTQ resin, DQ resin, DTQ resin and TQ resin.
- Adhesive adhesion improver (but not containing aliphatic unsaturated group and mercapto group) is preferable, and is selected from the group consisting of MQ resin, MDQ resin, MDT resin and MDTQ resin from the viewpoint of fluidity and ease of synthesis.
- One or more silicone resin-based adhesion improvers are more preferable, and one or more silicone resin-based adhesion improvers selected from the group consisting of MQ resins, MDQ resins, and MDT resins are more preferable, and high tackiness and structure control are easy. From the viewpoint, MQ resin is more preferable.
- the weight average molecular weight is preferably 2,000 to 100,000, more preferably 5,000 to 80,000, and still more preferably 10,000 to 60,000.
- the weight average molecular weight is a value obtained by using polystyrene as a calibration curve by gel permeation chromatographic analysis (GPC).
- (F) can be used at 150 parts by weight or less with respect to 100 parts by weight of (B), and (F) is preferably 5 to 150 parts by weight from the viewpoint of improving the adhesion to the substrate. 10 to 120 parts by weight is more preferable, and 15 to 100 parts by weight is further preferable.
- the silane coupling agent (excluding (D)
- inorganic fillers other than fumed silica polymerization inhibitor, antioxidant, light resistance
- Additives such as UV absorbers and light stabilizers, which are stability stabilizers, can be blended.
- the composition of the present invention is a polyorganosiloxane containing an aliphatic unsaturated group other than (B) within a range not impairing the effects of the present invention (for example, a branched polyorganosiloxane containing an aliphatic unsaturated group). Can be included, but preferably is not included.
- silane coupling agents include 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxysilane.
- trimethoxysilylpropyldiallyl isocyanurate bis (trimethoxysilylpropyl) allyl isocyanurate, tris (trimethoxysilylpropyl) isocyanurate, triethoxysilylpropyldiallyl isocyanurate, bis ( Examples include triethoxysilylpropyl) allyl isocyanurate and tris (triethoxysilylpropyl) isocyanurate.
- polymerization inhibitor examples include hydroquinone, p-methoxyphenol, t-butylcatechol, phenothiazine and the like.
- the antioxidant can be used to prevent oxidation of the cured product of the composition and improve weather resistance, and examples thereof include hindered amine-based and hindered phenol-based antioxidants.
- examples of the hindered amine antioxidant include N, N ′, N ′′, N ′′ ′-tetrakis- (4,6-bis (butyl- (N-methyl-2,2,6,6-tetramethylpiperidine- 4-yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine, dibutylamine 1,3,5-triazine N, N'-bis- (2,2,6 , 6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine ⁇ N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine polycondensate, poly [ ⁇ 6- (1, 1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-
- hindered phenol antioxidants include penta Erythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], thiodiethylene-bis [3- (3,5-di-tert -Butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), N, N′-hexane-1,6-diylbis [3- ( 3,5-di-tert-butyl-4-hydroxyphenylpropioamide), 3,5-bis (1,1-dimethylethyl) -4-hydroxyC7-C9 side chain alkyl ester of benzenepropanoic acid, 2,4- Dimethyl-6- (1-methylpentadecyl) phenol, diethyl [[3,5-bis (1,1-dimethylethyl) -4-
- the light stabilizer can be used to prevent photooxidative degradation of the cured product, and examples thereof include benzotriazole-based, hindered amine-based, and benzoate-based compounds.
- UV absorbers that are light-resistant stabilizers can be used to prevent light deterioration and improve weather resistance, for example, UV absorbers such as benzotriazole, triazine, benzophenone, and benzoate Etc.
- Examples of the ultraviolet absorber include 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol and 2- (2H-benzotriazol-2-yl) -4,6- Di-tert-pentylphenol, 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol, methyl 3- (3- (2H-benzotriazole-2) -Il) -5-tert-butyl-4-hydroxyphenyl) propionate / polyethylene glycol 300 reaction product, 2- (2H-benzotriazol-2-yl) -6- (linear and side chain dodecyl) -4 -Benzotriazole ultraviolet absorbers such as methylphenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(he Sil) oxy] -phenol and other triazine ultraviolet absorbers, benzophenone ultraviolet absorbers such as
- Examples include, but are not limited to, benzoate ultraviolet absorbers.
- the said ultraviolet absorber may be individual, or may use 2 or more types together.
- a hindered amine system is preferable. Among them, it is preferable to use a tertiary amine-containing hindered amine light stabilizer for improving the storage stability of the composition.
- Tertiary amine-containing hindered amine light stabilizers include Tinuvin 622LD, Tinuvin 144, CHIMASSORB 119FL (all manufactured by BASF); MARK LA-57, LA-62, LA-67, LA-63 (all Asahi Light stabilizers such as Sanol LS-765, LS-292, LS-2626, LS-1114, and LS-744 (all of which are manufactured by Sankyo Co., Ltd.).
- the composition of the present invention has a viscosity at 23 ° C. of 20,000 to 10,000,000 cP from the viewpoint of maintaining the shape after discharge in dam formation and preventing the sealant from flowing out.
- the viscosity is a value measured at a rotational speed of 6 rpm.
- the lower limit is preferably 23,000 cP, more preferably 25,000 cP, and from the viewpoint of dischargeability, the upper limit is preferably 3,000,000 cP, more preferably 2,000,000 cP.
- compositions of the present invention at 23 ° C., viscosity measured at a rotation speed 6rpm the (cP) at V 6rpm, 23 ° C., viscosity measured at a rotation speed 12rpm a (cP) and V 12rpm, with V 6rpm / V 12rpm
- the obtained thixotropy ratio is preferably 1.05 to 2.0. When the thixotropy ratio is in this range, the discharge is easy and the shape after discharge can be maintained.
- the thixotropy ratio is more preferably 1.1 to 1.65, and still more preferably 1.1 to 1.6.
- the composition of the present invention can be obtained by blending (A) to (E), optional component (F) and additives.
- blend (A) mix uniformly, and in the absence of ultraviolet rays, (C) and (D) and optional polymerization inhibitor. It is preferable to mix.
- put (A), (B), and (F) if necessary into a universal mixing stirrer, and mix uniformly at room temperature (10-30 ° C.) at low speed, and then in the absence of ultraviolet light, (C) , (D), a polymerization inhibitor, etc. are added, mixed under ice-cooling (less than 10 ° C.) at low speed, with cooling under reduced pressure, degassed, and then filtered as desired to obtain a composition. be able to.
- the composition of the present invention can be cured by irradiation with ultraviolet rays.
- the lamp in the wavelength range of the reactive range (C) include, for example, a high pressure mercury lamp (UV-7000), metal halide lamp (MHL-250, MHL-450, MHL-150, MHL-) manufactured by Ushio Electric Co., Ltd. 70), Korea: Metal halide lamp (JM-MTL 2KW) manufactured by JM tech, UV irradiation lamp (OSBL360) manufactured by Mitsubishi Electric Corporation, UV irradiation machine (UD-20-2) manufactured by Nippon Battery Co., Ltd.
- Irradiation dose is preferably 100 ⁇ 10000mJ / cm 2, more preferably 300 ⁇ 5000mJ / cm 2, more preferably from 500 ⁇ 3500mJ / cm 2.
- the cured product of the composition of the present invention has the following suitable physical properties.
- the visible light transmittance is more preferably 96% or more, and still more preferably 98% or more. From the viewpoint of visible transmittance, it is preferable to suppress the amount of (C) used. Further, after each of the components (A) and (B) is mixed uniformly or after heat treatment at 80 to 180 ° C., the visible light transmittance after curing can be improved. Heat treatment is preferable from the viewpoint of stability over time.
- the composition of the present invention can have a curing shrinkage rate of 1.0% or less, when applied to an image display device, distortion can be easily prevented and visibility can be ensured. Is preferable.
- the cure shrinkage is preferably 0.5% or less, more preferably 0.3% or less, and still more preferably 0.2% or less.
- the composition according to the present invention can have an E hardness after curing of 5 to 33, when applied to an image display device, it can easily relieve stress from the outside, and has a high temperature. It is preferable in that visibility can be ensured by preventing moisture penetration even under high humidity.
- the E hardness is preferably 5 to 30, and more preferably 10 to 30.
- the composition of the present invention is preferable in that the elongation after curing can be 50% or more, which is excellent in stress relaxation from the outside and can secure deformation resistance.
- the elongation after curing is preferably 80% or more, more preferably 100% or more, and further preferably 200% or more.
- the composition of the present invention is a dam material composition in an image display device.
- the dam material composition is used to form a frame on the display unit or the protection unit of the image display device.
- the sealant protrudes from the display unit or the like.
- the composition is trimmed on a liquid crystal panel with a dispensing nozzle of a dispensing machine (for example, 23G can be selected as appropriate according to the discharge amount), and then a material as a filler is applied and bonded to the cover panel.
- a material as a filler is applied and bonded to the cover panel.
- the composition of this invention has favorable adhesiveness, and can be applied suitably to both a display part or a protection part.
- composition of the present invention is suitable for manufacturing a large screen image display device having an image display panel of 5 to 100 inches, more preferably 7 to 80 inches, and further preferably 10 to 60 inches. It is suitable for manufacturing an ultra-thin image display device having a thickness of preferably 10 to 500 ⁇ m, more preferably 20 to 450 ⁇ m, and even more preferably 50 to 400 ⁇ m.
- the composition of the present invention is preferred when the sealant interposed between the protective part and the image display part in the image display device is an ultraviolet curable resin composition, more preferably an ultraviolet curable silicone resin composition.
- an ultraviolet curable silicone resin composition used as the sealant, the composition described in WO2012 / 086402 can be used. Specifically, (A ′) the viscosity at 23 ° C. is 20 to 25000 cP.
- R ′′ is independently C1 to C6 alkyl group or an aliphatic unsaturated group
- R ′′ are aliphatic unsaturated groups per molecule.
- Polyorganosiloxane containing a saturated group (however, the amount of (B2 ′) is the ratio of the number of aliphatic unsaturated groups in (B2 ′) to the total number of aliphatic unsaturated groups in (B ′).
- the ratio of the number of mercaptoalkyl groups present in (A ′) to the total number of aliphatic unsaturated groups in (B ′) and (D ′) is 0.5 to 1.05,
- the ratio of the number of mercaptoalkyl groups in (A ′) to the number of aliphatic unsaturated groups in (B ′) is 0.95 to 3
- the aliphatic unsaturated groups in (D ′) An ultraviolet curable silicone resin composition in which the ratio of the number of mercaptoalkyl groups in (A ′) to the number of is 1.5 to 3 is mentioned.
- E hardness is an amount within 1 change.
- composition was discharged for 10 seconds using a double threaded plastic needle (Musashi Engineering Co., Ltd .: needle length 12.7 mm, gauge: 20 G (inner diameter 0.58 mm, outer diameter 0.91 mm)). It is the weight (g).
- Visible light transmittance The liquid material is filled in a quartz cell to a thickness of 10 mm, and the cured product is set to a thickness of 150 ⁇ m, and the spectrophotometer (CM-3500d manufactured by Minolta Co., Ltd.) is used at 23 ° C. The transmittance at a visible light wavelength (360 to 780 nm) was measured.
- CM-3500d manufactured by Minolta Co., Ltd.
- Curing shrinkage (%) (specific gravity after curing ⁇ specific gravity before curing) / specific gravity after curing) ⁇ 100
- E Hardness after Curing Based on JIS K 6253 E, the energy hardness was changed by DUROMETER HARDNESS TYPE E (manufactured by ASKER), and the E hardness of the cured product at 23 ° C. was measured. E hardness after hardening is E hardness of the hardened
- the cured product has cracks of 0.02 mm or more in one direction and / or an air layer of 0.02 mm or more in one direction, and / or damage of 0.02 mm or more in one direction in either PMMA or glass. NG if there is, -If these cracks, air layer, and damage are not recognized at all, it is OK. It was. (10-2) High-temperature and high-humidity After the cured product is left in a constant-temperature and constant-humidity layer set to a high-temperature and high-humidity condition of 85 ° C.
- CM-3500d manufactured by Minolta Co., Ltd.
- a yellow index which is an index of the degree of discoloration. -If the yellow index is 1.0% or more, NG, -OK when the yellow index is less than 1.0% It was.
- Cohesive failure rate (11-1) vs. acrylic, vs. glass
- the composition On each adherend (PMMA, glass) having a width of 25 mm, the composition has a thickness of 0.1 mm and a length of 10 mm or more.
- a sample was prepared by coating and overlaying a tempered glass plate having a thickness of 2 mm and a width of 25 mm so that the composition had a stacking width of 10 mm, followed by curing at an ultraviolet energy dose of 3000 mJ / cm 2 .
- samples 1 day and 3 days later were subjected to a shear adhesion test using an autograph manufactured by Shimadzu Corporation with a measurement speed of 10 mm / min to peel off the adherend and glass plate. It was.
- Each polarizing film is applied with a width of 25 mm and a length of 60 mm or more so that the thickness of the composition is 0.1 mm, and a tempered glass plate with a thickness of 2 mm and a width of 25 mm is laminated so that the overlapping width of the composition is 10 mm.
- it was cured at an ultraviolet energy irradiation amount of 3000 mJ / cm 2 to prepare a sample.
- the sample was pulled at a tensile rate of 10 mm / min using an autograph manufactured by Shimadzu Corporation, and peeled 180 ° from the polarizing film and glass plate as the adherend. A peel adhesion test was conducted.
- the filling material was prepared as follows. The contents of (a-1), (c-1), (c-2), and (d-1) are as described later.
- (A-1) 8.5 parts by weight, vinyl-terminated polymethylphenyl siloxane (viscosity 3000 cP) 79.76 weights whose end is blocked with a dimethylvinylsiloxy group, 5% by mole of diphenylsiloxy units and the remainder is dimethylsiloxy units
- Parts and 10 parts by weight of MQ resin were mixed uniformly, then 0.22 parts by weight of (c-1), 0.22 parts by weight of (c-2) and 1.3 parts by weight of (d-1) were added, Furthermore, it mixed until it became uniform and it was set as the filling material.
- the viscosity of this material at 23 ° C. was 2750 cP (rotation speed: 60 rpm).
- the MQ resin is as follows.
- Weight average molecular weight 26200 The weight molecular weight is a value using polystyrene as a calibration curve by gel permeation chromatography (GPC).
- (A) in an Example and a comparative example is as follows.
- (A-1) Polymethylsiloxane containing mercaptopropyl group Average structural formula: ⁇ (CH 3 ) 3 SiO 1/2 ⁇ ⁇ HS (CH 2 ) 3 SiO 3/2 ⁇ 5 ⁇ (CH 3 ) 2 SiO 2 / 2 ⁇ 60
- (B1) in Examples and Comparative Examples is as follows.
- (B1-1) Vinyl-terminated polymethylphenylsiloxane vinyl-terminated polydimethyldiphenylsiloxane whose ends are blocked with dimethylvinylsiloxy groups, 5 mol% of diphenylsiloxy units, and the remainder is dimethylsiloxy units.
- a 1 L 1,1,3,3,5,5,7,7-octamethylcyclotetrasiloxane was added to a 3 L separable flask equipped with a cooling reflux tube and a three-one motor as a stirrer.
- Dehydration was performed by heating and stirring at / h for 3 hours, and then 0.1 g of potassium hydroxide was added and heating and stirring was performed.
- (B2) in Examples and Comparative Examples is as follows.
- (B2-1) has an average structural formula of ⁇ (CH 3 ) 3 —SiO 1/2 ⁇ 6 ⁇ SiO 2 ⁇ 8 ⁇ (CH 2 ⁇ CH) (CH 3 ) —SiO ⁇ M 6 D v Q 8 Resin weight average molecular weight: 22450
- the weight molecular weight is a value using polystyrene as a calibration curve by gel permeation chromatography (GPC).
- (E) in Examples and Comparative Examples is as follows.
- (E-1) Hemitic silica: BET specific surface area 200 m 2 / g
- (E-2) Silazane (hexamethyldisilazane) -treated fumed silica: BET specific surface area 200 m 2 / g
- (E-3) Hemitic silica: BET specific surface area 350 m 2 / g
- (E-5) Octamethylcyclotetrasiloxane-treated fumed silica: BET specific surface area 200 m 2 / g
- Example 1 30 parts by weight (300 g) of vinyl-terminated polymethylphenylsiloxane (b1-2) and 5 parts by weight of fumed silica (50 g) were placed in a 5 L universal mixing stirrer (Dalton), room temperature (22 ° C.), using a low speed lever Mix evenly for 30 minutes under rotating conditions. After uniform mixing, 70 parts by weight (700 g) of vinyl-terminated polymethylphenylsiloxane (b1-2) and 9.5 parts by weight (95 g) of mercaptopropyl group-containing polymethylsiloxane (a-1) were added and mixed uniformly.
- compositions of Examples and Comparative Examples were prepared with the formulations shown in Tables 1, 4 and 7, and the physical properties were evaluated. The results are shown in Tables 2 to 3, 5 to 6, and 8 to 9.
- Example 2 to 4 and 9 to 12 as in Example 1, (b1-2) was blended in two at a weight ratio of 30:70.
- Example 5 to 8, 13 to 15, 19 to 25, and Comparative Examples 1 and 2 as in Example 1, (b1-2) was blended in two at a weight ratio of 30:70, (B2-1) was blended at the same timing as the fumed silica.
- Comparative Example 3 all components (b1-2), (b2-1) and (a-1) were mixed, and then other components were added.
- a cured product having physical properties such as hardness and adhesiveness suitable for use in an image display device can be obtained, and it is difficult to determine the joint between the cured product and the sealant. Therefore, it is also preferable from the viewpoint of visibility.
- Comparative Example 3 it can be seen that when no fumed silica having a specific BET specific surface area is blended, the adhesion and curability are poor.
- Comparative Examples 1 and 2 even if fumed silica having a specific BET specific surface area is blended, if the blending amount exceeds the range of the present invention, the adhesiveness is inferior and the joining performance is reduced. As can be seen, it is also inferior in terms of visibility.
- the present invention is a dam material composition, and when an image display device is produced using the dam material composition, a composition in which a frame formed from the dam material composition has appropriate hardness and adhesion to an adherend. Provided. More preferably, it is difficult to distinguish the joint between the frame of the dam material and the sealant applied therein, and an image display device having good visibility can be provided.
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Abstract
Description
(B)(B1)式(I):
R1は、独立して、脂肪族不飽和基であり、
Rは、独立して、C1~C6アルキル基又はC6~C12アリール基であって、Rのうち、1~60モル%はC6~C12アリール基であり、
nは、23℃における粘度を100~1,000,000cPとする数である)で示される、脂肪族不飽和基を含有する直鎖状ポリオルガノシロキサンと、場合により(B2)SiO4/2単位、R'3SiO1/2単位及びR'2SiO2/2単位、並びに場合によってはさらにR'SiO3/2単位(式中、R'は、それぞれ独立して、C1~C6アルキル基又は脂肪族不飽和基を表す)からなり、1分子当たり、少なくとも3個のR'が脂肪族不飽和基である、分岐状ポリオルガノシロキサンとからなる、脂肪族不飽和基を含有するポリオルガノシロキサン;
(C)光反応開始剤;
(D)脂肪族不飽和基を含有するシラン化合物;並びに
(E)BET比表面積180~500m2/gの煙霧質シリカ
を含み、ここで、
(B)及び(D)中の脂肪族不飽和基の合計個数に対する、(A)に存在するメルカプトアルキル基の個数の比が、0.45~1.50であり、
(E)が、(B)100重量部に対して、0.5~24重量部であり、かつ
23℃における粘度が、20,000~10,000,000cPである
画像表示装置用のダム材組成物に関する。
本発明2は、(B)中の脂肪族不飽和基の個数に対する、(A)中のメルカプトアルキル基の個数の比が、0.5~4.0である、本発明1の画像表示装置用のダム材組成物に関する。
本発明3は、(D)中の脂肪族不飽和基の個数に対する、(A)中のメルカプトアルキル基の個数の比が、1.2~3.5である、本発明1又は2の画像表示装置用のダム材組成物に関する。
本発明4は、(E)が、BET比表面積300~500m2/gの煙霧質シリカである、本発明1~3のいずれかの画像表示装置用のダム材組成物に関する。
本発明5は、ダム材組成物について、B型回転粘度計を使用して、23℃で、回転数6rpmで測定した粘度(cP)をV6rpm、23℃で、回転数12rpmで測定した粘度(cP)をV12rpmとし、式:V6rpm/V12rpmにより求めたチキソトロピー比の値が、1.05~2.0である、本発明1~4のいずれかの画像表示装置用のダム材組成物に関する。
本発明6は、(C)の含有量が、(B)100重量部に対して、0.05~50重量部である、本発明1~5のいずれかの画像表示装置用のダム材組成物に関する。
本発明7は、(D)が、3-メタクリロキシプロピルトリエトキシシラン、3-メタクリロキシプロピルトリメトキシシラン、ビニルトリメトキシシラン及びビニルトリエトキシシランからなる群より選ばれる1種以上の脂肪族不飽和基を含有するシラン化合物である、本発明1~6のいずれかの画像表示装置用のダム材組成物に関する。
本発明8は、画像表示部と保護部との封止に、本発明1~7のいずれかの画像表示装置用のダム材組成物を用いてなる、画像表示装置に関する。
(A)23℃における粘度が20~25000cPである、ケイ素原子に結合するメルカプトアルキル基を含有するポリオルガノシロキサン;
(B)(B1)式(I):
R1は、独立して、脂肪族不飽和基であり、
Rは、独立して、C1~C6アルキル基又はC6~C12アリール基であって、Rのうち、1~60モル%はC6~C12アリール基であり、
nは、23℃における粘度を100~1,000,000cPとする数である)で示される、脂肪族不飽和基を含有する直鎖状ポリオルガノシロキサンと、場合により(B2)SiO4/2単位、R'3SiO1/2単位及びR'2SiO2/2単位、並びに場合によってはさらにR'SiO3/2単位(式中、R'は、それぞれ独立して、C1~C6アルキル基又は脂肪族不飽和基を表す)からなり、1分子当たり、少なくとも3個のR'が脂肪族不飽和基である、分岐状ポリオルガノシロキサンとからなる、脂肪族不飽和基を含有するポリオルガノシロキサン;
(C)光反応開始剤;
(D)脂肪族不飽和基を含有するシラン化合物;並びに
(E)BET比表面積180~500m2/gの煙霧質シリカ
を含む。
2RSH + I2 → RSSR + 2HI
の反応を利用した方法であり、滴定中、微量の過剰ヨウ素で滴定液が微黄色になることを利用する。
R1は、独立して、脂肪族不飽和基であり、
Rは、独立して、C1~C6アルキル基又はC6~C12アリール基であって、Rのうち、1~60モル%はC6~C12アリール基であり、
nは、23℃における粘度を100~1,000,000cPとする数である)で示される、脂肪族不飽和基を含有する直鎖状ポリオルガノシロキサンと、場合により(B2)SiO4/2単位、R'3SiO1/2単位及びR'2SiO2/2単位、並びに場合によってはさらにR'SiO3/2単位(式中、R'は、それぞれ独立して、C1~C6アルキル基又は脂肪族不飽和基を表す)からなり、1分子当たり、少なくとも3個のR'が脂肪族不飽和基である、分岐状ポリオルガノシロキサンとからなる、脂肪族不飽和基を含有するポリオルガノシロキサンを含有する。
{(CH3)3SiO1/2}m{SiO2}n
(式中、m+n=1であり、m及びnは0でない数である)で表わされるシリコーン樹脂が挙げられ、MDQ樹脂としては、平均構造式が、下記式
{(CH3)3SiO1/2}m{SiO2}n{(CH3)2SiO}l
(式中、m+n+l=1であり、m、n及びlは0でない数である)で表わされるシリコーン樹脂が挙げられ、MT樹脂としては、平均構造式が、下記式
{(CH3)3SiO1/2}m{(CH3)SiO3/2}o
(式中、m+o=1であり、m及びoは0でない数である)で表わされるシリコーン樹脂が挙げられ、MDT樹脂としては、平均構造式が、下記式
{(CH3)3SiO1/2}m{(CH3)2SiO}l{(CH3)SiO3/2}o
(式中、m+l+o=1であり、m、l及びoは0でない数である)で表わされるシリコーン樹脂が挙げられ、MDTQ樹脂としては、平均構造式が、下記式
{(CH3)3SiO1/2}m{SiO2}n{(CH3)2SiO}l{(CH3)SiO3/2}o
(式中、m+n+l+o=1であり、m、n、l及びoは0でない数である)で表わされるシリコーン樹脂が挙げられ、DQ樹脂としては、平均構造式が、下記式
{SiO2}n{(CH3)2SiO}l
(式中、n+l=1であり、n及びlは0でない数である)で表わされるシリコーン樹脂が挙げられ、DTQ樹脂としては、平均構造式が、下記式
{SiO2}n{(CH3)2SiO}l{(CH3)SiO3/2}o
(式中、n+l+o=1であり、n、l及びoは0でない数である)で表わされるシリコーン樹脂が挙げられ、TQ樹脂としては、平均構造式が、下記式
{SiO2}n{(CH3)SiO3/2}o
(式中、n+o=1であり、m及びoは0でない数である)で表わされるシリコーン樹脂が挙げられる。
〔硬化後の可視光透過率〕
本発明の組成物は、硬化厚み150μmにおける硬化後の可視光透過率を、95%以上とすることができるため、視認性の点から好ましい。可視光透過率は、より好ましくは96%以上、さらに好ましくは98%以上である。可視透過率の点からは、(C)の使用量を抑制することが好ましい。また、(A)、(B)の各成分を、それぞれ、又は均一に混合した後、80~180℃にて加熱処理することにより、硬化後の可視光透過率を向上させることができる。加熱処理は、経時的安定性の点からも好ましい。
本発明の組成物は、硬化収縮率を、1.0%以下とすることができるため、画像表示装置に適用した場合に、容易に、歪みが防止され、視認性を確保することができる点で好ましい。硬化収縮率は、好ましくは0.5%以下、より好ましくは0.3%以下、さらに好ましくは0.2%以下である。
本発明の組成物は、硬化後のE硬度を5~33とすることができるため、画像表示装置に適用した場合に、容易に、外部からの応力を適度に緩和することができ、かつ高温高湿下でも水分の浸透を抑止して、視認性を確保することができる点で好ましい。E硬度は、好ましくは5~30であり、より好ましくは10~30である。
本発明の組成物は、硬化後の伸びを50%以上とすることができるため、外部からの応力緩和に優れ、耐変形性を確保することができる点で好ましい。硬化後の伸びは、好ましくは80%以上であり、100%以上がより好ましく、200%以上がさらに好ましい。
(B’)(B1’)式(I’):
R1’は、独立して、脂肪族不飽和基であり、
R'は、独立して、C1~C6アルキル基又はC6~C12アリール基であって、R'のうち、1~60モル%はC6~C12アリール基であり、
n'は、23℃における粘度を100~25000cP、好ましくは100~8000cPとする数である)で示される、脂肪族不飽和基を含有する直鎖状ポリオルガノシロキサンと、(B2’)SiO4/2単位、R''3SiO1/2単位及びR''2SiO2/2単位、並びに場合によってはさらにR''SiO3/2単位(式中、R''は、それぞれ独立して、C1~C6アルキル基又は脂肪族不飽和基を表す)からなり、1分子当たり、少なくとも3個のR''が脂肪族不飽和基である、分岐状ポリオルガノシロキサンとからなる、脂肪族不飽和基を含有するポリオルガノシロキサン(ただし、(B2’)の量は、(B’)中の脂肪族不飽和基の全個数に占める(B2’)中の脂肪族不飽和基の個数の割合が50%以下となる量とする);
(C’)光反応開始剤;及び
(D’)脂肪族不飽和基を含有するシラン化合物
を含み、ここで、
(B’)及び(D’)中の脂肪族不飽和基の合計個数に対する、(A’)に存在するメルカプトアルキル基の個数の比が、0.5~1.05であり、
(B’)中の脂肪族不飽和基の個数に対する、(A’)中のメルカプトアルキル基の個数の比が、0.95~3であり、かつ
(D’)中の脂肪族不飽和基の個数に対する、(A’)中のメルカプトアルキル基の個数の比が、1.5~3である、紫外線硬化型シリコーン樹脂組成物が挙げられる。
(1)メルカプト基の個数の測定
ヨウ素源として、1/10規定ヨウ素溶液(特級試薬)を使用し、比色滴定により、単位重量当りのメルカプト基数を定量した。
計算方法: SH含有量(mmol/g) = (A×P×0.1)/(W×C)
A:変色するまでに要したヨウ素溶液滴下量
P:ヨウ素溶液の補正係数(試薬に記載されている補正係数):補正が必要な場合に記載
W:サンプル重量(g)
C:サンプルの不揮発分
予備測定を行ないヨウ素溶液量を求め、その後精度よく3回測定し、3回の平均値を求めた。
NMR測定における、Si-CH3(0.1ppm付近)、Si-Ph(7.3-7.7ppm付近)及びCH3Si-CH=CH2(5.7-6.3ppm付近)のピークが、それぞれ、(CH3)2SiO単位、Ph2-SiO単位及び(CH3)2Si-CH=CH2O1/2単位に対応するものとして、それぞれのピーク強度の比より単位数を求め、平均構造式を得て、そこから分子量を求め、不飽和基の個数を算出した。
回転粘度計(ビスメトロン VDA-L)(芝浦システム株式会社製)を使用して、400cP以下の範囲は、No.2ローターを使用し、400超~1500cPの範囲は、No.3ローターを使用し、1500cP超の範囲は、No.4ローターを使用し、所定の回転数で、23℃における粘度を測定した。チキソ性は、回転数12rpmにおける粘度:V12rpm、回転数6rpmにおける粘度:V6rpmを測定し、式:V6rpm/V12rpmによりにより求めた値である。
2条ネジプラスチックニードル(武蔵エンジアリング株式会社製:針長12.7mm、ゲージ:20G(内径0.58mm、外径0.91mm)を用いて、組成物を10秒間吐出した際の重量(g)である。
液状物については、石英セルに充填して厚さ10mmについて、硬化物については厚さ150μmにして、分光測式計((株)ミノルタ製CM-3500d)によって23℃における可視光領域波長(360~780nm)における透過率を測定した。
組成物の硬化前と硬化後の比重を電子比重計(MIRAGE社製SD-120L)により測定し、下記式より双方の比重差から算出した。
硬化収縮率(%)=(硬化後の比重-硬化前の比重)/ 硬化後の比重)×100
JIS K 6253 Eに準拠し、DUROMETER HARDNESS TYPE E(ASKER製)にて、エネルギー照射量を変化させて、23℃における硬化物のE硬度を測定した。硬化後のE硬度は、最大のエネルギー照射量で硬化させた硬化物のE硬度である。
JIS K 6301に準拠し、ショッパー引張り試験機(株式会社東洋精機製作所 製)にて23℃における最大のエネルギー照射量で硬化させた硬化物の伸びを測定した。
組成物の硬化物の比重は、電子比重計(MIRAGE社製SD-120L)により23℃にて測定した。
(10-1)ヒートショック
組成物の厚みが200μmとなるように、1mm厚のガラス板全面に塗布し、1mm厚のPMMA板で挟み、3000mJ/cm2の紫外線エネルギー照射量にて硬化させた後、-50℃から125℃までの温度サイクル(各温度30分間保持)にて環境試験を行なった(機器名:エスペック株式会社製TSA-71S-A)。
その後、23℃の状態に戻した後、硬化物及びPMMA、ガラスの状態を光学顕微鏡(10倍)で観察した。
-硬化物に、一方向で0.02mm以上のクラック及び/若しくは一方向で0.02mm以上の空気層が生じる、並びに/又はPMMAとガラスのいずれかに一方向で0.02mm以上の損傷がある場合をNG、
-これらのクラック、空気層、損傷が全く認められない場合をOK
とした。
(10-2)高温多湿下
硬化物を温度85℃、湿度85%RHの高温多湿条件に設定した恒温恒湿層に500時間放置後、分光測式計((株)ミノルタ製CM-3500d)により、温度23℃、湿度50%の状態に戻した後に変色の度合いの指標であるイエローインデックスにて評価を行なった。
-イエローインデックスが1.0%以上の場合をNG、
-イエローインデックスが1.0%未満の場合をOK
とした。
(11-1)対アクリル、対ガラス
幅25mmの各被着体(PMMA、ガラス)上に、組成物を厚み0.1mmとなるように、幅25mmで長さ10mm以上塗布し、組成物を重ね幅が10mmとなるように厚さ2mm、幅25mmの強化ガラス板を重ねた後、3000mJ/cm2の紫外線エネルギー照射量にて、硬化させて、試料を作製した。
試料作成直後、1日後及び3日後の試料について、島津製作所(株)社製オートグラフを用い、測定速度10mm/分の引張り速度で引っ張り、被着体とガラス板を剥離させる剪断接着試験を行なった。
被着体上の組成物の剥離部分の面積Smm2を求め、
(100×S)/(10×25)
を計算して凝集破壊率(%)とした。
(11-2)対偏光板
偏光板フィルムとして、幅25mmの液晶用偏光フィルム(品名:SEG1425DU 日東電工社製)、アンチグレア処理したフィルム(品名:AG150日東電工社製)、及びアンチリフレクション処理されたフィルム(品名:ARSタイプ日東電工社製)を用意した。各偏光フィルムに、組成物の厚みが0.1mmとなるように幅25mmで長さ60mm以上塗布し、組成物の重ね幅が10mmとなるように厚さ2mm、幅25mmの強化ガラス板を重ねた後、3000mJ/cm2となる紫外線エネルギー照射量にて硬化させて、試料を作製した。試料作成直後及び2時間後の試料について、島津製作所(株)社製オートグラフを用い、試料を測定速度10mm/分の引張り速度で引っ張り、被着体である偏光フィルムとガラス板から180°剥離させる、ピール接着試験を行なった。
被着体上の組成物の剥離部分の面積Smm2を求め、
(100×S)/(50×25)
を計算して凝集破壊率(%)とした。
(11-3)対アルミニウム、対ステンレス
幅25mmの各被着体(アルミニウム、ステンレス(SUS304))上に、組成物を厚み0.1mmとなるように、幅25mmで長さ10mm以上塗布し、組成物を重ね幅が10mmとなるように厚さ2mm、幅25mmの強化ガラス板を重ねた後、ガラス側から3000mJ/cm2の紫外線エネルギー照射量にて、硬化させて、試料を作製した。
試料作成直後、1日後及び3日後の試料について、島津製作所(株)社製オートグラフを用い、測定速度10mm/分の引張り速度で引っ張り、被着体とガラス板を剥離させる剪断接着試験を行なった。
被着体上の組成物の剥離部分の面積Smm2を求め、塗布面積との比率で凝集破壊率(%)を算出した。
(100×S)/(10×25)
硬化物を、温度85℃、湿度85%の条件で500時間保管した後、温度23℃、湿度50%の状態に戻し、変色の度合いの指標であるイエローインデックスを分光測式計((株)ミノルタ製CM-3500d)によって評価を行なった。
松浪ガラス社製スライドガラス(S1112)上に、組成物(ダム材)を200μm厚みとなるように、幅0.3mmで、75mm×25mmの枠状に塗布し、2000mJ/cm2となる紫外線エネルギー照射量にて硬化させた後、充填用材料(フィル材)をその中に塗布し、松浪ガラス社製スライドガラス(S1112)を貼り合わせ、同様に3000mJ/cm2となる紫外線エネルギー照射量にて硬化させた。打ち継ぎ部分を目視で観察して、その視認性を評価した。
○:目視では容易には見分けられない
○-△:目視で簡単には見分けられない
△:目視で見分けられる
△-X:簡単に見分けられる
X:容易に見分けられる
ここで、充填用材料は、以下のようにして調製した。(a-1)、(c-1)、(c-2)、(d-1)の内容は、後述のとおりである。
(a-1)8.5重量部、末端がジメチルビニルシロキシ基で閉塞され、ジフェニルシロキシ単位が5モル%、残余がジメチルシロキシ単位であるビニル末端ポリメチルフェニルシロキサン(粘度3000cP)79.76重量部及びMQ樹脂10重量物を、均一に混合した後、(c-1)0.22重量部、(c-2)0.22重量部、(d-1)1.3重量部を加え、さらに均一になるまで混合して、充填用材料とした。この材料の23℃における粘度は、2750cPであった(回転数60rpm)。
MQ樹脂は、以下のとおりである。
平均構造式:{(CH3)3SiO1/2}{SiO2}3.5のMQ樹脂
重量平均分子量:26200
重量分子量は、ゲル浸透クロマトグラフ分析(GPC)により、ポリスチレンを検量線とした値である。
ガラス板(1mm厚、137mm×102mm)の表面に、組成物(ダム材)を2条ネジプラスチックニードル(武蔵エンジアリング株式会社製:針長12.7mm、ゲージ:23G(内径0.33mm、外径0.64mm))を用いて、厚みが200μmになるように、幅0.3mmで、135mm×100mmの枠状に塗布し、充填用材料(フィル材)をサンエイテック社製ディスペンサー(2300N改)を用いて、その中に塗布し、PMMA板(1mm厚、157mm×110mm)と貼り合わせ、5000mJ/cm2の紫外線エネルギー照射量にて硬化させた後、23℃で1時間放置、次いで85℃に加熱し、その温度で6時間放置した後、23℃の状態に戻すことを1サイクルとして、3サイクル繰り返した(機器名:エスペック株式会社製小型環境試験機 SU-661)。
各サイクル後、23℃の状態に戻した状態における硬化物及びPMMA、ガラスの状態を光学顕微鏡(10倍)で観察した。
-硬化物とPPMA及びガラスのいずれもが接着した状態ではあるが、硬化物にクラックが発生している場合を「クラック」、
-硬化物とPMMA及びガラスの少なくともいずれかとの間で剥離が生じている場合を「剥離」
とした。
(a-1)メルカプトプロピル基を含有するポリメチルシロキサン
平均構造式:{(CH3)3SiO1/2}{HS(CH2)3SiO3/2}5{(CH3)2SiO2/2}60
粘度:330cP
10mm厚みにおける透過率:93.1%
単位重量当りのメルカプト基数:0.97mmol/g
(b1-1)ビニル末端ポリメチルフェニルシロキサン
末端がジメチルビニルシロキシ基で閉塞され、ジフェニルシロキシ単位が5モル%、残余がジメチルシロキシ単位であるビニル末端ポリジメチルジフェニルシロキサン
1分子中の脂肪族不飽和基の平均個数:2
NMR測定による平均構造式:
CH2=CH-Si(CH3)2-O-{Si(CH3)2O}1165-{SiPh2O}61-Si(CH3)2-CH=CH2
粘度:98600cP
分子量:98540
末端がジメチルビニルシロキシ基で閉塞され、ジフェニルシロキシ単位が5モル%、残余がジメチルシロキシ単位であるビニル末端ポリジメチルジフェニルシロキサン
1分子中の脂肪族不飽和基の平均個数:2
粘度:20020cP
NMR測定による平均構造式:
CH2=CH-Si(CH3)2-O-{Si(CH3)2O}595-{SiPh2O}31-Si(CH3)2-CH=CH2
分子量:50130
(b1-2)の合成は、以下のようにして行った。
冷却用還流管、攪拌装置としてスリーワンモーターを装備した3Lのセパルブルフラスコに、1,1,3,3,5,5,7,7-オクタメチルシクロテトラシロキサン1800g、1,1,3,3,5,5,7,7-オクタフェニルシクロテトラシロキサン260g、1,1,3,3-テトラメチル-1,3-ジビニルジシロキサン7.6gを150~160℃にて窒素ガス0.5Nm3/hにて3時間加熱攪拌することにより脱水を行い、その後水酸化カリウム0.1gを加えて加熱攪拌を行った。加熱撹拌は、フラスコ内で水酸化カリウムが溶解し均一になり、かつ粘度が15000cP~18000cPに増粘するまで継続した。その後、エチレンクロロヒドリン 10gにて100℃にて中和後、スーパーセライトフロスを濾過助剤に用いて濾過した後、170~180℃、2mmHgの減圧下にて低沸分を除去することにより、末端がジメチルビニルシロキシ基で閉塞され、ジフェニルシロキシ単位が5モル%、残余がジメチルシロキシ単位であるビニル末端ポリメチルフェニルシロキサン1832gを得た。
(b2-1)は、平均構造式が{(CH3)3-SiO1/2}6{SiO2}8{(CH2=CH)(CH3)-SiO}のM6DvQ8樹脂
重量平均分子量:22450
重量分子量は、ゲル浸透クロマトグラフ分析(GPC)により、ポリスチレンを検量線とした値である。
(c-1)2-ヒドロキシ-2-メチルプロピオフェノン
(c-2)2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン
(c-3)1-ヒドロキシ-シクロヘキシル-フェニル-ケトン
(d-1)3-メタクリロキシプロピルトリメトキシシラン
(e-1)煙霧質シリカ:BET比表面積 200m2/g
(e-2)シラザン(ヘキサメチルジシラザン)処理煙霧質シリカ:BET比表面積 200m2/g
(e-3)煙霧質シリカ:BET比表面積 350m2/g
(e-4)シラザン(ヘキサメチルジシラザン)処理煙霧質シリカ:BET比表面積 350m2/g
(e-5)オクタメチルシクロテトラシロキサン処理煙霧質シリカ:BET比表面積 200m2/g
(f-1)p-t-ブチルカテコール(重合禁止剤)
ビニル末端ポリメチルフェニルシロキサン(b1-2)30重量部(300g)、煙霧質シリカ5重量部(50g)を5Lの万能混合攪拌機(ダルトン社製)に入れ、室温(22℃)、低速レバーによる回転条件で30分間、均一に混合した。均一に混合した後、ビニル末端ポリメチルフェニルシロキサン(b1-2)70重量部(700g)、メルカプトプロピル基含有ポリメチルシロキサン(a-1)9.5重量部(95g)を加え、均一に混合した後、さらに、p-t-ブチルカテコール(g-1)0.04重量部(0.4g)、2-ヒドロキシ-2-メチルプロピオフェノン(c-1)0.3重量部(3.0g)、2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン(c-2)0.3重量部(3.0g)の溶解混合物、3-メタクリロキシプロピルトリメトキシシラン(d-1)1.5重量部(15g)を加え、氷水冷却下(8℃)、低速レバーによる回転条件で30分間、冷却減圧にて均一に混合した。その後、洗浄した400メッシュの金網にて異物等を除去し、組成物を得た。
なお、実施例2~4、9~12については、実施例1と同様に、(b1-2)を30:70の重量割合で2回に分けて配合した。
実施例5~8、13~15、19~25、比較例1~2については、実施例1と同様に、(b1-2)を30:70の重量割合で2回に分けて配合し、(b2-1)を、煙霧質シリカと同じタイミングで配合した。
比較例3は、(b1-2)、(b2-1)(a-1)の全量を混合した後、その他の成分を加えた。
比較例3に示されるように、特定のBET比表面積を有する煙霧質シリカが配合されていない場合、接着性及び硬化性に劣ることがわかる。また、比較例1及び2に示されるように、特定のBET比表面積を有する煙霧質シリカが配合されていても、配合量が本発明の範囲を超える場合、接着性に劣り、打継性能に示されるように、視認性の点からも劣ることがわかる。
Claims (8)
- (A)23℃における粘度が20~25000cPである、ケイ素原子に結合するメルカプトアルキル基を含有するポリオルガノシロキサン;
(B)(B1)式(I):
R1は、独立して、脂肪族不飽和基であり、
Rは、独立して、C1~C6アルキル基又はC6~C12アリール基であって、Rのうち、1~60モル%はC6~C12アリール基であり、
nは、23℃における粘度を100~1,000,000cPとする数である)で示される、脂肪族不飽和基を含有する直鎖状ポリオルガノシロキサンと、場合により(B2)SiO4/2単位、R'3SiO1/2単位及びR'2SiO2/2単位、並びに場合によってはさらにR'SiO3/2単位(式中、R'は、それぞれ独立して、C1~C6アルキル基又は脂肪族不飽和基を表す)からなり、1分子当たり、少なくとも3個のR'が脂肪族不飽和基である、分岐状ポリオルガノシロキサンとからなる、脂肪族不飽和基を含有するポリオルガノシロキサン;
(C)光反応開始剤;
(D)脂肪族不飽和基を含有するシラン化合物;並びに
(E)BET比表面積180~500m2/gの煙霧質シリカ
を含み、ここで、
(B)及び(D)中の脂肪族不飽和基の合計個数に対する、(A)に存在するメルカプトアルキル基の個数の比が、0.45~1.50であり、
(E)が、(B)100重量部に対して、0.5~24重量部であり、かつ
23℃における粘度が、20,000~10,000,000cPである
画像表示装置用のダム材組成物。 - (B)中の脂肪族不飽和基の個数に対する、(A)中のメルカプトアルキル基の個数の比が、0.5~4.0である、請求項1記載の画像表示装置用のダム材組成物。
- (D)中の脂肪族不飽和基の個数に対する、(A)中のメルカプトアルキル基の個数の比が、1.2~3.5である、請求項1又は2記載の画像表示装置用のダム材組成物。
- (E)が、BET比表面積300~500m2/gの煙霧質シリカである、請求項1~3のいずれか1項記載の画像表示装置用のダム材組成物。
- ダム材組成物について、B型回転粘度計を使用して、23℃で、回転数6rpmで測定した粘度(cP)をV6rpm、23℃で、回転数12rpmで測定した粘度(cP)をV12rpmとし、式:V6rpm/V12rpmmにより求めたチキソトロピー比の値が、1.05~2.0である、請求項1~4のいずれか1項記載の画像表示装置用のダム材組成物。
- (C)の含有量が、(B)100重量部に対して、0.05~50重量部である、請求項1~5のいずれか1項記載の画像表示装置用のダム材組成物。
- (D)が、3-メタクリロキシプロピルトリエトキシシラン、3-メタクリロキシプロピルトリメトキシシラン、ビニルトリメトキシシラン及びビニルトリエトキシシランからなる群より選ばれる1種以上の脂肪族不飽和基を含有するシラン化合物である、請求項1~6のいずれか1項記載の画像表示装置用のダム材組成物。
- 画像表示部と保護部との封止に、請求項1~7のいずれか1項記載の画像表示装置用のダム材組成物を用いてなる、画像表示装置。
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