WO2019159830A1 - 画像表示装置封止材および画像表示装置封止シート - Google Patents
画像表示装置封止材および画像表示装置封止シート Download PDFInfo
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- WO2019159830A1 WO2019159830A1 PCT/JP2019/004554 JP2019004554W WO2019159830A1 WO 2019159830 A1 WO2019159830 A1 WO 2019159830A1 JP 2019004554 W JP2019004554 W JP 2019004554W WO 2019159830 A1 WO2019159830 A1 WO 2019159830A1
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- WIPO (PCT)
- Prior art keywords
- polyolefin resin
- mass
- styrene
- skeleton
- image display
- Prior art date
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/46—Reaction with unsaturated dicarboxylic acids or anhydrides thereof, e.g. maleinisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
Definitions
- the present invention relates to an image display device sealing material and an image display device sealing sheet.
- an image display device including a display element, for example, a liquid crystal display, an organic EL display, and the like are known.
- the display element is sealed with a sealing material in order to prevent the display element from being deteriorated by moisture in the atmosphere.
- the sealing material is attached to an adherend (for example, a substrate) on which the display element is mounted so as to embed the display element.
- adherend for example, a substrate
- a sealing material for example, a sheet-shaped sealing material containing a styrene-isobutylene-styrene copolymer and an aliphatic petroleum resin has been proposed (for example, see Patent Document 1).
- the sealing material for sealing the display element is not affected by the external environment such as temperature and humidity in order to prevent moisture from entering the interface between the sealing material and the adherend. It is desirable to stably adhere to.
- the sheet-like sealing material described in Patent Document 1 has a problem that the adhesion (pressure-sensitive adhesive force) to the adherend is reduced under high temperature and high humidity conditions (for example, 60 ° C. and 90% RH). .
- the sealing material for sealing the display element is required to have low moisture permeability and transparency. It is difficult to ensure a good balance.
- the present invention provides an image display device sealing material and an image display device sealing sheet capable of ensuring transparency and improving moisture and heat resistance while reducing moisture permeability.
- the present invention [1] includes a first polyolefin resin that has a main chain containing a styrene skeleton and is not modified with a functional group, a second polyolefin resin that is acid-modified, and a softening agent.
- the image display device sealing material is included.
- the present invention [2] includes the image display device sealing material according to the above [1], wherein the second polyolefin resin has a main chain containing a styrene skeleton.
- the present invention [3] is the above-mentioned [1] or [2], wherein the main chain of the first polyolefin resin and / or the main chain of the second polyolefin resin has an isobutylene skeleton.
- An image display device sealing material is included.
- the main chain of the first polyolefin resin has an isobutylene skeleton, and the main chain of the second polyolefin resin does not have an isobutylene skeleton.
- the image display apparatus sealing material as described in any one of these.
- the present invention [5] includes an image display device sealing sheet having a sealing layer made of the image display device sealing material according to any one of [1] to [4].
- the image display device sealing material and the image display device sealing sheet of the present invention include a first polyolefin resin that has a main chain containing a styrene skeleton and is not modified with a functional group, and a second acid-modified second resin. Contains a polyolefin resin and a softening agent.
- the image display device sealing material and the image display device sealing sheet can ensure transparency and can improve moisture and heat resistance while being able to reduce moisture permeability.
- FIG. 1 is a sectional side view of a sealing sheet as an embodiment of the image display device sealing sheet of the present invention.
- FIG. 2 is a side sectional view of an organic EL display with a touch sensor as an embodiment (an aspect having an in-cell structure or an on-cell structure) of an image display device including the sealing layer shown in FIG.
- FIG. 3 is a side sectional view of an organic EL display with a touch sensor as another embodiment (an aspect having an out-cell structure) of an image display device.
- the image display device sealing material (hereinafter referred to as a sealing material) of the present invention is a sealing resin composition (sealing resin composition for an image display device) for sealing a display element to be described later.
- the sealing material has, as essential components, a first polyolefin resin having a main chain containing a styrene skeleton and not modified with a functional group (hereinafter referred to as an unmodified styrene skeleton-containing polyolefin resin), and an acid.
- a second polyolefin resin to be modified hereinafter referred to as an acid-modified polyolefin resin
- a softening agent are contained.
- Unmodified styrene skeleton-containing polyolefin resin is a copolymer of a styrene skeleton-containing monomer and an olefin monomer, and comprises a styrene skeleton and an olefin skeleton derived from an olefin monomer. It has a main chain containing.
- styrene skeleton-containing monomer examples include styrene, ⁇ -methylstyrene, vinyltoluene, and isopropenyltoluene.
- the styrene skeleton-containing monomer can be used alone or in combination of two or more.
- the styrene skeleton-containing monomers styrene is preferable. That is, the styrene skeleton-containing monomer preferably contains styrene.
- olefin monomer examples include unsaturated aliphatic olefin monomers having 2 to 10 carbon atoms (for example, ethylene, propylene, butene, isobutylene, butadiene, pentene, pentadiene, isoprene, hexadiene, methylbutene, etc.), and those having 5 to 20 carbon atoms.
- unsaturated alicyclic olefin monomers for example, cyclopentadiene, dicyclopentadiene and the like. Olefin monomers can be used alone or in combination of two or more.
- an unsaturated aliphatic olefin monomer having 2 to 10 carbon atoms is preferable, ethylene, butene, and isobutylene are more preferable, and isobutylene is particularly preferable.
- the olefin monomer preferably includes an unsaturated aliphatic olefin monomer having 2 to 10 carbon atoms, and more preferably includes at least one olefin monomer selected from the group consisting of ethylene, butene, and isobutylene. Particularly preferably, isobutylene is included.
- the main chain of the unmodified styrene skeleton-containing polyolefin resin preferably has an olefin skeleton derived from an unsaturated aliphatic olefin monomer having 2 to 10 carbon atoms, and more preferably, It has at least one olefin skeleton selected from the group consisting of an ethylene skeleton, a butene skeleton and an isobutylene skeleton, and particularly preferably has an isobutylene skeleton.
- the main chain of the non-modified styrene skeleton-containing polyolefin resin has an isobutylene skeleton, it is possible to reliably improve the transparency of the sealing material and to reliably reduce moisture permeability.
- Examples of such an unmodified styrene skeleton-containing polyolefin-based resin include a block copolymer, an alternating copolymer, a random copolymer, and preferably a block copolymer.
- the unmodified styrene skeleton-containing polyolefin resin is not modified with a functional group. In other words, no functional group is introduced into the unmodified styrene skeleton-containing polyolefin resin.
- the functional group is, for example, a polar group having polarity.
- polar groups include acidic groups (for example, carboxy groups, phosphoric acid groups, sulfo groups, acid anhydride groups derived therefrom), epoxy groups, hydroxy groups, amino groups, imino groups, (meth) acryloyl groups. And ester groups.
- the unmodified styrene skeleton-containing polyolefin resin may be a hydrogenated product to which hydrogen is added.
- unmodified styrene skeleton-containing polyolefin resins include styrene-isobutylene block copolymer (SIB), styrene-isobutylene-styrene block copolymer (SIBS), and styrene-butadiene-styrene block copolymer.
- SIB styrene-isobutylene block copolymer
- SIBS styrene-isobutylene-styrene block copolymer
- SEBS styrene-ethylene-butene-styrene block copolymer
- the unmodified styrene skeleton-containing polyolefin resin can be used alone or in combination of two or more.
- styrene-isobutylene block copolymer a styrene-isobutylene block copolymer (SIB), a styrene-isobutylene-styrene block copolymer (SIBS), and a styrene-ethylene-butene-styrene block copolymer are used.
- SIB styrene-isobutylene block copolymer
- SIBS styrene-isobutylene-styrene block copolymer
- SIBS styrene-ethylene-butene-styrene block copolymer
- the unmodified styrene skeleton-containing polyolefin resin preferably contains at least one polyolefin resin selected from the group consisting of SIB, SIBS and SEBS, more preferably contains SIB and / or SIBS, Preferably, SIB and SIBS are included.
- the unmodified styrene skeleton-containing polyolefin resin is preferably a polyolefin resin selected from the group consisting of SIB, SIBS and SEBS (more preferably SIB and / or SIBS, particularly preferably SIB and SIBS). Become.
- the weight average molecular weight (Mw) of such an unmodified styrene skeleton-containing polyolefin resin is, for example, 20,000 or more, preferably 30,000 or more, more preferably 50,000, for example, 300,000 or less, Preferably, it is 200,000 or less, More preferably, it is 100,000 or less.
- the weight average molecular weight (M w ) can be determined by gel permeation chromatography (GPC) using polystyrene as a standard substance (the same applies hereinafter).
- melt mass flow rate (MFR) of the unmodified styrene skeleton-containing polyolefin resin is, for example, 0.01 g / 10 min or more, preferably 0.1 g / 10 min or more, more preferably 0.5 g / 10 min or more, for example, 40 g / 10 min or less, preferably 30 g / 10 min or less, and more preferably 25 g / 10 min or less.
- Melt mass flow rate (MFR) can be measured in accordance with JIS K 7210 under measurement conditions of a plastometer cylinder temperature of 230 ° C. and a load of 2.16 kgf (the same applies hereinafter).
- the unmodified styrene skeleton-containing polyolefin resin preferably has an MFR of 10 g / 10 min or more, an unmodified styrene skeleton-containing polyolefin resin (hereinafter referred to as a high MFR unmodified styrene skeleton-containing polyolefin resin), and MFR.
- an unmodified styrene skeleton-containing polyolefin resin hereinafter referred to as a low MFR unmodified styrene skeleton-containing polyolefin resin
- 10 g / 10 min an unmodified styrene skeleton-containing polyolefin resin
- the initial adhesive strength (adhesion) of the sealing material can be improved. Can be planned.
- the non-modified styrene skeleton-containing polyolefin resin has both a high MFR unmodified styrene skeleton-containing polyolefin resin and a low MFR unmodified styrene skeleton-containing polyolefin resin
- the high MFR unmodified styrene skeleton-containing polyolefin resin The content ratio is, for example, 5% by mass or more, preferably 10% by mass or more, for example 50%, based on the total of the high MFR unmodified styrene skeleton-containing polyolefin resin and the low MFR unmodified styrene skeleton-containing polyolefin resin.
- % By mass or less preferably 40% by mass or less, more preferably 30% by mass or less, and particularly preferably 20% by mass or less.
- the initial adhesive strength of the encapsulant can be reliably improved.
- the content of the styrene skeleton is, for example, 10% by mass or more, preferably 15% by mass or more, for example, 40% by mass or less, preferably 35% by mass or less.
- the content of the unmodified styrene skeleton-containing polyolefin resin in the sealing material is, for example, 1% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more, for example, 60% by mass or less, preferably , 50% by mass or less, and more preferably 40% by mass or less.
- the content ratio of the unmodified styrene skeleton-containing polyolefin resin to the total of the unmodified styrene skeleton-containing polyolefin resin, the acid-modified polyolefin resin and the softening agent is, for example, 2% by mass or more, preferably 5% by mass or more. More preferably, it is 15% by mass or more, particularly preferably 25% by mass or more, such as 70% by mass or less, preferably 55% by mass or less, more preferably 45% by mass or less, and particularly preferably 35% by mass. It is as follows.
- the content ratio of the unmodified styrene skeleton-containing polyolefin resin is, for example, 10% by mass or more, preferably 20% by mass or more, based on the total of the unmodified styrene skeleton-containing polyolefin resin and the acid-modified polyolefin resin. More preferably, it is 30% by mass or more, particularly preferably 50% by mass or more, for example, 95% by mass or less, preferably 90% by mass or less, more preferably 80% by mass or less, and particularly preferably 70% by mass or less. It is.
- the sealing material can be ensured in transparency, and the sealing material can be reliably improved in adhesion (pressure-sensitive adhesive force). Can be planned.
- the acid-modified polyolefin resin is a polyolefin resin into which an acidic group is introduced, and is, for example, a reaction product of a polyolefin resin and an acidic group-containing compound having an acidic group.
- polyolefin resins examples include homopolymers of olefin monomers, copolymers of styrene skeleton-containing monomers and olefin monomers (non-modified styrene skeleton-containing polyolefin resins), and the like.
- polystyrene resins a homopolymer of an olefin monomer and a copolymer of a styrene skeleton-containing monomer and an olefin monomer are preferable, and a copolymer of a styrene skeleton-containing monomer and an olefin monomer is more preferable. Is mentioned.
- olefin monomer examples include the olefin monomers described above, preferably unsaturated aliphatic olefin monomers having 2 to 10 carbon atoms, and more preferably ethylene, butene, and isobutylene. Olefin monomers can be used alone or in combination of two or more.
- styrene skeleton-containing monomer examples include the styrene skeleton-containing monomer described above, and preferably styrene.
- the styrene skeleton-containing monomer can be used alone or in combination of two or more.
- the main chain of the acid-modified polyolefin-based resin includes at least an olefin skeleton derived from an olefin monomer, preferably includes an olefin skeleton and a styrene skeleton, and more preferably an unsaturated aliphatic system having 2 to 10 carbon atoms. It contains an olefin skeleton derived from an olefin monomer and a styrene skeleton, and particularly preferably contains at least one olefin skeleton selected from the group consisting of an ethylene skeleton, a butene skeleton and an isobutylene skeleton and a styrene skeleton.
- the main chain of the acid-modified polyolefin resin can have an isobutylene skeleton.
- the main chain of the unmodified styrene skeleton-containing polyolefin resin has an isobutylene skeleton
- the main chain of the acid-modified polyolefin resin preferably does not have an isobutylene skeleton.
- examples of the polyolefin resin include block copolymers, alternating copolymers, and random copolymers, and block copolymers are preferable.
- polyisobutene homopolymer and styrene-ethylene-butene-styrene block copolymer SEBS are preferable.
- Examples of the acidic group of the acidic group-containing compound include the above-described acidic group, preferably a carboxy group and an acid anhydride group of a carboxy group, and more preferably an acid anhydride group of a carboxy group. .
- the acidic group-containing compound examples include unsaturated carboxylic acids, anhydrides and derivatives thereof, and preferably anhydrides and derivatives of unsaturated carboxylic acids.
- the acidic group-containing compound can be used alone or in combination of two or more.
- unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, norbornene dicarboxylic acid, bicyclo [2,2,1] hept- And 2-ene-5,6-dicarboxylic acid.
- Examples of the unsaturated carboxylic acid anhydride include the above-mentioned unsaturated carboxylic acid anhydrides, and preferably maleic anhydride.
- Examples of the unsaturated carboxylic acid derivative include acid halides, amides, imides, esters, and the like of the above-described unsaturated carboxylic acids.
- Specific examples of unsaturated carboxylic acid derivatives include maleyl chloride, maleenylimide, dimethyl maleate, monomethyl maleate, diethyl maleate, diethyl fumarate, dimethyl itaconate, diethyl citraconic acid, dimethyl tetrahydrophthalate, and bicyclo [2 , 2,1] hept-2-ene-5,6-dicarboxylate and the like.
- Such an acid-modified polyolefin resin is prepared by reacting a polyolefin resin with an acidic group-containing compound in the presence of a known radical polymerization initiator (eg, di-tert-butyl peroxide).
- a known radical polymerization initiator eg, di-tert-butyl peroxide
- acid-modified polyolefin resins preferably, a reaction product of a polyisobutene homopolymer and maleic anhydride, and a styrene-ethylene-butene-styrene block copolymer (SEBS) and maleic anhydride.
- SEBS styrene-ethylene-butene-styrene block copolymer
- the acid-modified polyolefin resins can be used alone or in combination of two or more.
- the acid-modified polyolefin-based resin preferably contains a reaction product of a polyisobutene homopolymer and maleic anhydride, and / or a reaction product of SEBS and maleic anhydride, and more preferably from them. Become.
- the weight average molecular weight (Mw) of such an acid-modified polyolefin resin is, for example, 20,000 or more, preferably 30,000 or more, for example, 300,000 or less, preferably 200,000 or less, more preferably , 100,000 or less.
- the content of the styrene skeleton is, for example, 10% by mass or more, preferably 15% by mass or more, for example, 40% by mass or less, preferably 35% by mass or less.
- the amount of modification in the acid-modified polyolefin-based resin (the content ratio of the unit (constituent unit) derived from the acidic group-containing compound) is, for example, 0.1% by mass or more, preferably 0.5% by mass or more, for example, It is 5.0 mass% or less, Preferably, it is 3.0 mass% or less.
- the content ratio of acidic groups can be calculated from the charged amounts of polyolefin resin and acidic group-containing compound, and 1 H-NMR measurement results (the same applies hereinafter).
- the content ratio of the unit (structural unit) derived from the acidic group-containing compound with respect to the total of the unmodified styrene skeleton-containing polyolefin resin and the acid-modified polyolefin resin is, for example, 0.1% by mass or more, preferably 0 2% by mass or more, more preferably 0.3% by mass or more, for example 2.0% by mass or less, preferably 1.5% by mass or less, more preferably 1.0% by mass or less, particularly preferably 0.8 mass% or less.
- the content ratio of the acid-modified polyolefin resin in the sealing material is, for example, 1% by mass or more, preferably 2% by mass or more, more preferably 5% by mass or more, for example, 60% by mass or less, preferably 40% by mass. % Or less.
- the content ratio of the acid-modified polyolefin resin to the sum of the unmodified styrene skeleton-containing polyolefin resin, acid-modified polyolefin resin and softener is, for example, 1% by mass or more, preferably 3% by mass or more, and more preferably Is 5% by weight or more, particularly preferably 10% by weight or more, particularly preferably 15% by weight or more, for example 70% by weight or less, preferably 50% by weight or less, more preferably 40% by weight or less, Preferably, it is 35% by mass or less, and particularly preferably 25% by mass or less.
- the content ratio of the acid-modified polyolefin resin is, for example, 5% by mass or more, preferably 10% by mass or more, and more preferably, based on the total of the unmodified styrene skeleton-containing polyolefin resin and the acid-modified polyolefin resin. 20% by mass or more, particularly preferably 30% by mass or more, for example, 90% by mass or less, preferably 80% by mass or less, more preferably 70% by mass or less, and particularly preferably 50% by mass or less.
- the content ratio of the acid-modified polyolefin resin is not less than the above lower limit, it is possible to reliably improve the heat and moisture resistance of the sealing material.
- the content ratio of the acid-modified polyolefin-based resin is not more than the above upper limit, it is possible to surely improve the adhesion of the sealing material and reduce the moisture permeability.
- the non-modified styrene skeleton-containing polyolefin resin has both a high MFR unmodified styrene skeleton-containing polyolefin resin and a low MFR unmodified styrene skeleton-containing polyolefin resin, the unmodified styrene skeleton-containing polyolefin resin, acid
- the content ratio of the acid-modified polyolefin resin to the total of the modified polyolefin resin and the softening agent is, for example, 1% by mass or more, preferably 3% by mass or more, for example, 20% by mass or less, preferably 15% by mass or less. More preferably, it is 10% by mass or less, particularly preferably 8% by mass or less, and particularly preferably 5% by mass or less.
- the non-modified styrene skeleton-containing polyolefin resin has both a high MFR unmodified styrene skeleton-containing polyolefin resin and a low MFR unmodified styrene skeleton-containing polyolefin resin, the unmodified styrene skeleton-containing polyolefin resin and acid
- the content ratio of the acid-modified polyolefin resin to the total of the modified polyolefin resin is, for example, 1% by mass or more, preferably 3% by mass or more, for example, 25% by mass or less, preferably 20% by mass or less, more preferably. Is 15% by mass or less, particularly preferably 10% by mass or less.
- the initial adhesive strength of the sealing material can be improved more reliably.
- the softener is a component that imparts tackiness at normal temperature (23 ° C.) to the sealing material, and is a resin having a number average molecular weight (Mn) of 10,000 or less.
- softening agent examples include polyolefin resins that do not contain a styrene skeleton and are not acid-modified, and preferably include homopolymers of the above-described olefin monomers.
- an unsaturated aliphatic olefin monomer having 2 to 10 carbon atoms is preferable, and at least one olefin monomer selected from the group consisting of ethylene, propylene, isobutylene, and butene is more preferable. Particularly preferred is at least one olefin monomer selected from the group consisting of ethylene, propylene and butene, and particularly preferred is butene.
- Olefin monomers can be used alone or in combination of two or more.
- olefin monomer homopolymer examples include polyisobutylene, polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, and the like.
- polybutene and ethylene-propylene copolymer are used. Coalescence is mentioned, More preferably, polybutene is mentioned.
- the homopolymer of an olefin monomer can be used alone or in combination of two or more.
- the softening agent preferably contains polybutene and / or an ethylene-propylene copolymer, more preferably contains polybutene, and particularly preferably consists of polybutene.
- the softening agent contains polybutene, it is possible to improve the adhesion of the sealing material and reduce the water vapor transmission rate more reliably.
- the molecular weight of such a softening agent is, for example, smaller than the molecular weights of the unmodified styrene skeleton-containing polyolefin resin and the acid-modified polyolefin resin.
- the number average molecular weight (Mn) of the softening agent is, for example, 500 or more, preferably 1,000 or more, more preferably 2,000 or more, for example, 10,000 or less, preferably 3500 or less.
- the number average molecular weight (M n ) can be determined by gel permeation chromatography (GPC) using polystyrene as a standard substance (the same applies hereinafter).
- the content ratio of the softening agent in the sealing material is, for example, 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, for example, 60% by mass or less, preferably 50% by mass or less. is there.
- the content ratio of the softening agent to the total of the unmodified styrene skeleton-containing polyolefin resin, the acid-modified polyolefin resin and the softening agent is, for example, 20% by mass or more, preferably 30% by mass or more, for example, 70% by mass. Hereinafter, it is preferably 60% by mass or less, and more preferably 50% by mass or less.
- the sealing material can be imparted with tackiness at normal temperature (23 ° C.), and the adhesion of the sealing material can be reliably improved.
- the sealing material may consist of the above essential components, and can further contain a tackifier as an optional component.
- the tackifier is a component that imparts tackiness at a high temperature (60 ° C. or higher) to the sealing material.
- tackifiers include aliphatic tackifiers, alicyclic tackifiers, aromatic tackifiers, rosin tackifiers, terpene tackifiers, and water additives thereof.
- aromatic tackifier and a terpene tackifier are used.
- aromatic tackifiers examples include styrene oligomers and C9 petroleum resins. Aromatic tackifiers can be used alone or in combination of two or more.
- styrene oligomers are preferable.
- styrene oligomer examples include a polymer of the above-mentioned styrene skeleton-containing monomer, and a copolymer of styrene and ⁇ -methylstyrene is preferable.
- the number average molecular weight (M n ) of the aromatic tackifier is, for example, 500 or more, preferably 700 or more, for example, 2500 or less, preferably 2000 or less.
- terpene-based tackifier examples include terpene phenol resin.
- the terpene tackifier can be used alone or in combination of two or more.
- terpene-based tackifiers terpene phenol resins are preferable.
- Terpene phenol is a copolymer (reaction product) of a terpene compound and a phenol compound.
- a terpene compound is a compound having, as a main skeleton, a hydrocarbon having isoprene (C 5 H 8 ) as a structural unit.
- the terpene compound include ⁇ -pinene, ⁇ -pinene, dipentene, limonene, ⁇ -ferrandrene, ⁇ -ferrandrene, ⁇ -terpinene, ⁇ -terpinene, ⁇ -terpinene, terpinolene, myrcene, allocymene, 1,8- Cineol, 1,4-cineole, ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol, 4-terpineol, sabinene, camphene, tricyclene, paramenten-1, paramenten-2, paramenten-3, paramenten-8, paramentadienes , ⁇ 2-carene, ⁇ 3-calen, caryophyllene, longifolene
- phenol compound examples include phenol, cresol, xylenol, propylphenol, nonylphenol, hydroquinone, resorcin, methoxyphenol, bromophenol, bisphenol A, and bisphenol F.
- the phenol compounds can be used alone or in combination of two or more. Among the phenol compounds, preferably, phenol is used.
- the number average molecular weight (M n ) of the terpene tackifier is, for example, 500 or more, preferably 700 or more, for example, 2,500 or less, preferably 2,000 or less.
- Such a terpene tackifier may be a commercially available product.
- Examples of commercially available terpene tackifiers include YS Polystar T-130 (manufactured by Yasuhara Chemical Co., Ltd.), YS Polystar T-160 (manufactured by Yasuhara Chemical Co., Ltd.), and the like.
- the softening point of such a tackifier is, for example, 80 ° C. or higher, preferably 100 ° C. or higher, more preferably 120 ° C. or higher, for example, 180 ° C. or lower, preferably 165 ° C. or lower.
- the softening point can be measured according to the method described in JIS K2207 (the same applies hereinafter).
- the content ratio of the tackifier in the sealing material is, for example, 0% by mass or more, preferably 5% by mass or more, for example, 60% by mass or less, preferably 50% by mass or less, more preferably 20% by mass or less. It is.
- the sealing material can be imparted with adhesiveness at a high temperature (60 ° C. or higher), and the adhesiveness in the high temperature region of the sealing material is reliably improved. be able to.
- the sealing material may be a silane coupling agent (for example, epoxy group-containing silane coupling agent), a leveling agent, a filler, an anti-aging agent, a wettability improver, a surfactant, a plasticizer, if necessary.
- a silane coupling agent for example, epoxy group-containing silane coupling agent
- a leveling agent for example, epoxy group-containing silane coupling agent
- a filler for example, epoxy group-containing silane coupling agent
- an anti-aging agent for example, a wettability improver, a surfactant, a plasticizer, if necessary.
- UV absorbers, preservatives, antibacterial agents and the like may be contained in appropriate proportions.
- Such a sealing material has a main chain containing a styrene skeleton, a non-modified styrene skeleton-containing polyolefin resin not modified with a functional group, an acid-modified polyolefin resin to be acid-modified, and a softener. contains.
- the sealing material can reduce moisture permeability (water vapor transmission rate) and can improve moisture and heat resistance while ensuring transparency.
- the sealing material improves adhesion (pressure-sensitive adhesion) under conditions of high temperature and high humidity (for example, 60 ° C. and 90% RH) in addition to improvement of adhesion (pressure-sensitive adhesion) at normal temperature (23 ° C.). Can be achieved.
- the water vapor permeability of the sealing material is, for example, 1 g / m 2 ⁇ 24 h or more, for example, 20 g / m 2 ⁇ 24 h or less, preferably 15 g / m 2 ⁇ 24 h, at 40 ° C. and 90% RH.
- it is more preferably 12 g / m 2 ⁇ 24 h or less, particularly preferably 10 g / m 2 ⁇ 24 h or less, and particularly preferably 7 g / m 2 ⁇ 24 h or less.
- the water vapor transmission rate can be measured according to the method described in Examples described later (the same applies hereinafter).
- the water vapor permeability of the sealing material is, for example, 10 g / m 2 ⁇ 24 h or more, for example, 30 g / m 2 ⁇ 24 h or less, preferably 25 g / m 2 ⁇ 24 h or less at 60 ° C. and 90% RH. .
- the haze value of the sealing material is, for example, 0% or more, for example, 5% or less, preferably 2% or less, and more preferably 1% or less.
- the haze value can be measured with a known haze meter (for example, a haze meter NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd.).
- the dielectric constant at 100 kHz of the sealing material is, for example, 2.0 or more, preferably 2.2 or more, for example, 3.0 or less, preferably 2.8 or less.
- the dielectric constant can be measured by a self-balancing bridge method using a known dielectric measuring instrument (for example, LCR meter HP4284A manufactured by Agilent Technologies).
- the above-described sealing material can be distributed as it is, and is an industrially usable product, but is preferably distributed as an image display device sealing sheet from the viewpoint of handleability.
- the sealing sheet 1 as one Embodiment of the image display apparatus sealing sheet of this invention is demonstrated.
- the sealing sheet 1 includes a sealing layer 2 made of the sealing material described above, a base film 3, and a release film 4.
- the sealing sheet 1 is a component for manufacturing an image display device, and does not include a display element and a substrate on which the display element is mounted. Specifically, the sealing sheet 1 and the base film 3 are separated from each other. It is a device that consists of a mold film 4 and is distributed industrially and can be used industrially.
- the sealing layer 2 is protected by the base film 3 and the release film 4 when the sealing sheet 1 is stored.
- the base film 3 and the release film 4 are peeled off.
- the thickness of the sealing layer 2 is, for example, 1 ⁇ m or more, preferably 5 ⁇ m or more, for example, 100 ⁇ m or less, preferably 30 ⁇ m or less.
- the base film 3 has a flat plate shape, specifically, has a predetermined thickness, extends in a predetermined direction orthogonal to the thickness direction, and has a flat surface and a flat back surface.
- the sticking surface (surface) of the base film 3 is peeled off as necessary.
- Examples of the material of the base film 3 include resin materials such as polyester (for example, polyethylene terephthalate (PET)) and polyolefin (for example, polyethylene, polypropylene, etc.), and preferably polyethylene terephthalate.
- resin materials such as polyester (for example, polyethylene terephthalate (PET)) and polyolefin (for example, polyethylene, polypropylene, etc.), and preferably polyethylene terephthalate.
- a film having a moisture barrier property or a gas barrier property is preferable, and a film made of polyethylene terephthalate is more preferable.
- the thickness of the base film 3 is appropriately selected depending on the material of the film, but can be set to, for example, about 25 ⁇ m to 150 ⁇ m from the viewpoint of having the ability to follow a material to be sealed such as a display element.
- the release film 4 is detachably attached to the surface of the sealing layer 2 in order to protect the sealing layer 2 until the sealing sheet 1 is used. That is, the release film 4 is laminated on the surface of the sealing layer 2 so as to cover the surface of the sealing layer 2 when the sealing sheet 1 is shipped, transported, and stored.
- the flexible film can be peeled off from the surface of the sealing layer 2 so as to be curved.
- the release film 4 has a flat plate shape, specifically, has a predetermined thickness, extends in a predetermined direction orthogonal to the thickness direction, and has a flat surface and a flat back surface. Moreover, the sticking surface (back surface) of the release film 4 is peeled off as necessary.
- the material of the release film 4 include the same resin material as that of the base film 3.
- the thickness of the release film 4 is appropriately selected depending on the material of the film, but can be set to, for example, about 25 ⁇ m to 150 ⁇ m from the viewpoint of having the ability to follow a material to be sealed such as a display element.
- the sealing material described above is prepared, and the sealing material is applied to the surface of the base film 3 by a known coating method.
- the sealing material is prepared by mixing the above-described essential components and optional components in the above proportions. Moreover, in manufacture of the sealing sheet 1, a sealing material is preferably diluted with the organic solvent and is prepared as a varnish of a sealing material.
- the organic solvent is not particularly limited as long as it can uniformly disperse or dissolve the above-described essential components and optional components.
- the organic solvent include aromatic hydrocarbons (eg, benzene, toluene, xylene), ketones (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone), ethers (eg, dibutyl ether, tetrahydrofuran, dioxane, ethylene).
- Glycol monoalkyl ether ethylene glycol dialkyl ether, 1-methoxy-2-propanol, etc.
- esters eg, ethyl acetate, butyl acetate, etc.
- nitrogen-containing compounds eg, N-methylpyrrolidone, dimethylimidazolidinone, Dimethylformaldehyde, etc.
- the organic solvent can be used alone or in combination of two or more.
- organic solvents aromatic hydrocarbons are preferable, and xylene is more preferable.
- the encapsulant (encapsulant varnish) applied to the base film 3 is dried, and the organic solvent is volatilized as necessary to form a coating film.
- the heating temperature is, for example, 80 ° C. or higher, preferably 90 ° C. or higher, for example, 110 ° C. or lower, preferably 100 ° C. or lower.
- the heating time is, for example, 3 minutes or more, preferably 5 minutes or more, for example, 30 minutes or less, preferably 10 minutes or less.
- the coating film is dried, and the sealing layer 2 formed from the sealing material is prepared.
- the release film 4 is attached to the surface of the sealing layer 2.
- the sealing sheet 1 is manufactured by the above.
- Such a sealing sheet 1 is suitably used for sealing (display element optical element) of an image display device.
- an organic EL display with a touch sensor hereinafter referred to as an organic EL display 10 as an embodiment of an image display device will be described.
- an organic EL display with a touch sensor is used as the image display device, but the image display device is not particularly limited.
- the image display device include a liquid crystal display (including a liquid crystal display with a touch sensor), an organic EL display (including an organic EL display with a touch sensor), and the like.
- Organic EL display 10 includes element mounting unit 11, sealing layer 2, and cover glass or barrier film 15.
- the element mounting unit 11 includes a substrate 13, an organic EL element 12 as an example of a display element, a barrier layer 16, and an electrode (not shown).
- the substrate 13 supports the organic EL element 12.
- the substrate 13 preferably has flexibility.
- the organic EL element 12 is a known organic EL element and is mounted on the substrate 13. Although not shown, the organic EL element 12 includes a cathode reflective electrode, an organic EL layer, and an anode transparent electrode.
- the barrier layer 16 covers the organic EL element 12 and suppresses atmospheric moisture from contacting the organic EL element 12.
- Electrode (not shown) constitutes a sensor of an organic EL display with a touch sensor.
- An electrode (not shown) is located between the substrate 13 and the sealing layer 2 (described later).
- an electrode (not shown) may be located in the substrate 13 or may be located on the organic EL element 12.
- the sealing layer 2 the base film 3 and the release film 4 are peeled off, and the organic EL element 12 covered with the barrier layer 16 is embedded and attached to the substrate 13 (pressure-sensitive adhesive). .
- Such an organic EL display 10 has an in-cell structure in which the organic EL element 12 is disposed between two electrodes constituting the sensor, or one of the two electrodes constituting the sensor is disposed on the organic EL element 12. Has an on-cell structure.
- the sealing sheet 1 includes a sealing layer 2, a base film 3, and a release film 4, but the image display device sealing sheet of the present invention is not limited to this.
- the image display device sealing sheet may not include the base film 3 and / or the release film 4 as long as the sealing layer 2 is included. That is, the image display device sealing sheet may be composed of only the sealing layer 2, and may include the sealing layer 2 and any one of the base film 3 and the release film 4.
- the organic EL display 10 includes the barrier layer 16, but is not limited thereto.
- the organic EL display 10 may not include the barrier layer 16.
- the organic EL display 10 has an in-cell structure in which the organic EL element 12 is disposed between two electrodes constituting the sensor, or one of the two electrodes is disposed on the organic EL element 12. Although it has an on-cell structure, it is not limited to this.
- the sensor unit 25 is disposed on the sealing layer 2.
- the sensor unit 25 includes electrodes that constitute a sensor of an organic EL display with a touch sensor.
- the substrate 13 does not include an electrode.
- Tables 1 to 4 show the presence or absence of styrene skeleton, isobutylene skeleton and modification in unmodified styrene skeleton-containing polyolefin resin, acid-modified polyolefin resin, softener and tackifier.
- SEBS styrene-ethylene-butene-styrene block copolymer
- SIBS styrene-isobutylene-styrene block copolymer
- Mw weight average molecular weight
- MFR 0.1 g / 10 min, manufactured by Kaneka Corporation
- a maleic acid-modified styrene-ethylene-butene-styrene block copolymer (M-SEBS) was prepared.
- the maleic acid-modified styrene-ethylene-butene-styrene block copolymer (M-SEBS) has a weight average molecular weight (Mw) of 75,000 and is modified in the maleic acid-modified styrene-ethylene-butene-styrene block copolymer. The amount was 1.5% by mass.
- Preparation Example 7 Maleic acid-modified polyisobutylene (M-modified polyisobutylene) was prepared in the same manner as in Preparation Example 6 except that 3 kg of G1652 (SEBS) was changed to 3 kg of Hymol 5H (polyisobutylene, manufactured by JXTG Energy).
- the weight average molecular weight (Mw) of the acid-modified polyisobutylene was 45,000, and the amount of modification in the maleic acid-modified polyisobutylene was 1.0% by mass.
- the reaction solution was continuously extracted from the upper part of the polymerization reactor so that the reaction solution in the polymerization reactor was always 1 L. Then, ethylene gas is supplied into the polymerization reactor using a bubbling tube at a supply rate of 30 L / h, propylene gas is supplied at a supply rate of 30 L / h, and hydrogen gas is supplied at a supply rate of 90 L / h. Supplied with. Thereby, ethylene and propylene copolymerized. The copolymerization reaction was carried out at 35 ° C. by circulating a refrigerant through a jacket attached to the outside of the polymerization reactor.
- reaction solution polymerization solution
- hydrochloric acid poured into a large amount of methanol to precipitate a polyethylene polypropylene copolymer, and then dried under reduced pressure at 130 ° C. for 24 hours.
- PEPP polyethylene polypropylene copolymer
- the ethylene content in the hydrocarbon softener A was 53.8 mol%. Moreover, the 40 degreeC kinematic viscosity of the hydrocarbon softener A was 600 cSt. The number average molecular weight (Mn) of the hydrocarbon softener A was 2600.
- Preparation Example 11 (Hydrocarbon softener B) Preparation Example 10 except that the ethylene gas supply rate was changed to 34 L / h, the propylene gas supply rate was changed to 34 L / h, and the hydrogen gas supply rate was changed to 82 L / h. Similarly, a polyethylene polypropylene copolymer (PEPP) was prepared as a hydrocarbon softener B.
- PEPP polyethylene polypropylene copolymer
- the ethylene content in the hydrocarbon softener B was 54.5 mol%.
- the 40 ° C. kinematic viscosity of the hydrocarbon softener B was 1100 cSt.
- the number average molecular weight (Mn) of the hydrocarbon softener B was 3200.
- the molar ratio of ⁇ -methylstyrene and styrene was 60:40, the supply amount of the monomer and toluene mixture was 1.0 L / h, and the supply amount of the diluted catalyst was 75 mL / h.
- reaction solution was transferred to the second-stage autoclave and the polymerization reaction was continued at 5 ° C., and then the reaction was performed when the total residence time in the first-stage and second-stage autoclaves became 2 hours.
- the liquid was continuously discharged, and then 1 L of the reaction liquid was collected to complete the polymerization reaction.
- the ⁇ -methylstyrene-styrene copolymer has a softening point Tm of 140 ° C.
- the ⁇ -methylstyrene-styrene copolymer has a number average molecular weight Mn of 1870
- the ⁇ -methylstyrene-styrene copolymer has a number average molecular weight Mn of 1870.
- the weight average molecular weight Mw was 3230.
- a PET film (molded PET film (trade name: Purex A31, manufactured by Teijin DuPont Films, thickness: 38 ⁇ m, mold release film) was bonded to the sealing layer at room temperature using a thermal laminator.
- the sealing sheet provided with a base film, a sealing layer, and a release film was prepared.
- the release film and the base film were peeled from the sealing layer, and the sealing layer was bonded to the medicine wrapping paper to obtain a measurement sample.
- the water vapor permeability (moisture permeability) of the obtained sample was measured according to JIS Z0208 under conditions of 40 ° C. and 90% RH and 60 ° C. and 90% RH. Then, it converted into the value in case the thickness of a sample is 100 micrometers from the film thickness of the sample used for the measurement. The results are shown in Tables 1 to 4.
- the release film was peeled off from the sealing layer. Then, the exposed sealing layer was bonded to alkali glass (width 25 mm ⁇ length 10 cm ⁇ thickness 2 mm). Thereafter, the base film is peeled off from the sealing layer, and an aluminum foil / PET composite film (PALAC Alpet 30-12, 15 mm wide ⁇ 15 cm long ⁇ 40 ⁇ m thick) is exposed on the exposed surface. The substrate was placed in contact with the surface, and a 2 kg load was applied at room temperature (23 ° C.) for 1 minute.
- the aluminum foil / PET composite film was pulled so that the peel angle was 90 °, and the stress at that time was defined as the initial adhesive strength.
- a sealing layer in which an alkali glass and an aluminum foil / PET composite film were bonded together was separately prepared, and the sealing layer was allowed to stand for 3 days at 60 ° C. and 90% RH.
- the image display device sealing material and the image display device sealing sheet of the present invention are suitably used as sealing materials for various image display devices, specifically, sealing materials for liquid crystal displays, organic EL displays and the like.
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Abstract
Description
本発明の画像表示装置封止材(以下、封止材とする。)は、後述する表示素子を封止するための封止樹脂組成物(画像表示装置用封止樹脂組成物)である。
無変性スチレン骨格含有ポリオレフィン系樹脂は、スチレン骨格含有モノマーとオレフィンモノマーとの共重合体であって、スチレン骨格と、オレフィンモノマーに由来するオレフィン骨格とを含む主鎖を有する。
酸変性ポリオレフィン系樹脂は、酸性基が導入されるポリオレフィン樹脂であって、例えば、ポリオレフィン樹脂と、酸性基を有する酸性基含有化合物との反応生成物である。
軟化剤は、封止材に常温(23℃)でのタック性を付与する成分であって、数平均分子量(Mn)が10,000以下の樹脂である。
封止材は、上記の必須成分からなってもよく、任意成分として、粘着付与剤をさらに含有することもできる。
このような封止材は、スチレン骨格を含む主鎖を有し、官能基により変性されていない無変性スチレン骨格含有ポリオレフィン系樹脂と、酸変性される酸変性ポリオレフィン系樹脂と、軟化剤とを含有する。
上記した封止材は、そのまま単独で流通可能であり、産業上利用可能な製品であるが、取扱性の観点から好ましくは、画像表示装置封止シートとして流通する。
そのような封止シート1は、画像表示装置の(表示素子光学素子)の封止に好適に利用される。図2を参照して、画像表示装置の一実施形態としてのタッチセンサ付き有機ELディスプレイ(以下、有機ELディスプレイ10とする。)について説明する。
変形例において、上記の実施形態と同様の部材については、同一の参照符号を付し、その詳細な説明を省略する。
準備例1(SIBS/SIB)
SIBSTAR 062M(スチレン-イソブチレン-スチレンブロック共重合体(SIBS)とスチレン-イソブチレン共重合体(SIB)との混合物、SIBS/SIB(質量比)=60/40、スチレン骨格含有量=20質量%、重量平均分子量(Mw)=60,000、MFR=20g/10min、カネカ社製)を準備した。なお、表1~表4には、無変性スチレン骨格含有ポリオレフィン系樹脂、酸変性ポリオレフィン系樹脂、軟化剤および粘着付与剤における、スチレン骨格、イソブチレン骨格および変性の有無を示す。
G1652(スチレン-エチレン-ブテン-スチレンブロック共重合体(SEBS、スチレン骨格含有量=30質量%、重量平均分子量(Mw)=80,000、Kraton社製)を準備した。
SIBSTAR 072T(スチレン-イソブチレン-スチレンブロック共重合体(SIBS)、スチレン骨格含有量=30質量%、重量平均分子量(Mw)=65,000、MFR=6g/10min、カネカ社製)を準備した。
SIBSTAR 102T(スチレン-イソブチレン-スチレンブロック共重合体(SIBS)、スチレン骨格含有量=25質量%、重量平均分子量(Mw)=100,000、MFR=0.6g/10min、カネカ社製)を準備した。
SIBSTAR 103T(スチレン-イソブチレン-スチレンブロック共重合体(SIBS)、スチレン骨格含有量=31質量%、重量平均分子量(Mw)=100,000、MFR=0.1g/10min、カネカ社製)を準備した。
準備例6(M化SEBS)
G1652(SEBS)3kgを、10Lのトルエンに加え、窒素雰囲気下において145℃に昇温してトルエンに溶解させた。さらに、攪拌下において、無水マレイン酸382gと、ジ-tert-ブチルパーオキシド(ラジカル重合開始剤)175gとを、4時間かけて、SEBSのトルエン溶液に供給し、続けて145℃において2時間攪拌した。冷却後、多量のアセトンを投入し、無水マレイン酸により変性されたSEBSを沈殿させ、ろ過し、アセトンで洗浄した後、真空乾燥した。
G1652(SEBS)3kgを、ハイモール5H(ポリイソブチレン、JXTGエネルギー社製)3kgに変更したこと以外は、準備例6と同様にして、マレイン酸変性ポリイソブチレン(M化ポリイソブチレンを準備した。マレイン酸変性ポリイソブチレンの重量平均分子量(Mw)は、45,000であり、マレイン酸変性ポリイソブチレンにおける変性量は、1.0質量%であった。
準備例8(ポリイソブチレン)
ハイモール5H(ポリイソブチレン、重量平均分子量(Mw)=50,000、JXTGエネルギー社製)を準備した。
準備例9(ポリブテン)
HV-1900(ポリブテン、数平均分子量(Mn)=2900、JXTGエネルギー社製)を準備した。
窒素置換した攪拌翼付連続重合反応器に、脱水精製したヘキサン1Lを加え、96mmol/Lに調整したエチルアルミニウムセスキクロリド(Al(C2H5)1.5・Cl1.5)のヘキサン溶液を、500ml/hの供給速度により連続的に1時間供給した後、16mmol/lに調整したVO(OC2H5)Cl2(触媒)のヘキサン溶液を500ml/hの供給速度で連続的に供給するとともに、ヘキサンを500ml/hの供給速度で連続的に供給した。
エチレンガスの供給速度を34L/hに変更したこと、プロピレンガスの供給速度を34L/hに変更したこと、および、水素ガスの供給速度を82L/hに変更したこと以外は、準備例10と同様にして、ポリエチレンポリプロピレン共重合体(PEPP)を、炭化水素系軟化剤Bとして準備した。
準備例12(粘着付与剤A)
攪拌翼を備えた実容量1270mlのオートクレーブに、α-メチルスチレン、スチレンおよび脱水精製したトルエンの混合物(容量比:モノマーの合計/トルエン=1/1)と、脱水精製したトルエンで10倍希釈したボロントリフロライドフェノラート錯体(フェノール1.7倍当量)とを連続的に供給し、反応温度5℃において重合反応させた。
YSポリスターT130(テルペンフェノール樹脂、ヤスハラケミカル社製)を準備した。
YSポリスターT160(テルペンフェノール樹脂、ヤスハラケミカル社製)を準備した。
実施例1~28および比較例1~6
表1~表4に示す各成分(無変性スチレン骨格含有ポリオレフィン系樹脂、酸変性ポリオレフィン系樹脂、ポリイソブチレン、軟化剤および粘着付与剤)を、表1~表4に示す処方で混合して、封止材を調製した。なお、封止材は、キシレン(有機溶媒)により希釈され、封止材のワニスとして調製された。
・外観(白濁の有無)
各実施例および各比較例の封止材のワニスを、塗工機によりPETフィルム(離型処理されたPETフィルム(商品名:ピューレックスA53、帝人デュポンフィルム社製、厚さ:38μm、ベースフィルム)上に塗工した後、窒素パージオーブンにて、90℃で5分間乾燥させて、厚さ25μmの封止層を形成した。
○:白濁なし。
△:やや白濁。
×:白濁。
上記の外観の評価と同様にして、各実施例および各比較例の封止シートを調製した。
上記の外観の評価と同様にして、各実施例および各比較例の封止シートを調製した。
2 封止層
Claims (5)
- スチレン骨格を含む主鎖を有し、官能基により変性されていない第1のポリオレフィン系樹脂と、
酸変性される第2のポリオレフィン系樹脂と、
軟化剤と、を含有することを特徴とする、画像表示装置封止材。 - 前記第2のポリオレフィン系樹脂は、スチレン骨格を含む主鎖を有することを特徴とする、請求項1に記載の画像表示装置封止材。
- 前記第1のポリオレフィン系樹脂の主鎖、および/または、前記第2のポリオレフィン系樹脂の主鎖は、イソブチレン骨格を有することを特徴とする、請求項1に記載の画像表示装置封止材。
- 前記第1のポリオレフィン系樹脂の主鎖は、イソブチレン骨格を有し、
前記第2のポリオレフィン系樹脂の主鎖は、イソブチレン骨格を有しないことを特徴とする、請求項1に記載の画像表示装置封止材。 - 請求項1に記載の画像表示装置封止材からなる封止層を有することを特徴とする、画像表示装置封止シート。
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