WO2023112873A1 - 接着剤組成物、電子部品用接着剤及び携帯電子機器用接着剤 - Google Patents
接着剤組成物、電子部品用接着剤及び携帯電子機器用接着剤 Download PDFInfo
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- WO2023112873A1 WO2023112873A1 PCT/JP2022/045596 JP2022045596W WO2023112873A1 WO 2023112873 A1 WO2023112873 A1 WO 2023112873A1 JP 2022045596 W JP2022045596 W JP 2022045596W WO 2023112873 A1 WO2023112873 A1 WO 2023112873A1
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- acrylate
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- DJFNMTSCKHMHQI-UHFFFAOYSA-N isocyanic acid;octane Chemical compound N=C=O.CCCCCCCC DJFNMTSCKHMHQI-UHFFFAOYSA-N 0.000 description 1
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- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
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- 239000004632 polycaprolactone Substances 0.000 description 1
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- WSFQLUVWDKCYSW-UHFFFAOYSA-M sodium;2-hydroxy-3-morpholin-4-ylpropane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(O)CN1CCOCC1 WSFQLUVWDKCYSW-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
- C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
Definitions
- the present invention relates to adhesive compositions, adhesives for electronic components, and adhesives for portable electronic devices.
- Moisture-curable adhesives containing moisture-curable resins that are cured by external moisture have been widely used, for example, in electronic devices.
- Moisture-curable adhesives include, for example, Patent Document 1, which contains a radically polymerizable compound, a moisture-curable urethane resin, a photoradical polymerization initiator, and a coupling agent to improve adhesiveness and high-temperature environments. It has been demonstrated that a light and moisture-curable resin composition having excellent reliability under low temperature and high temperature and high humidity environments can be obtained.
- Patent Document 2 discloses that a photo-moisture-curable resin composition having excellent moisture-and-heat resistance is obtained by containing a radically polymerizable compound, a moisture-curable resin, a photoradical polymerization initiator, and a coupling agent. It is shown.
- an object of the present invention is to provide a moisture-curable adhesive that has sufficient impact resistance even when a metal is used as an adherend.
- an adhesive composition containing a moisture-curable resin and a silane coupling agent having a nitrogen-containing heterocycle As a result of intensive studies, the present inventors have found that the above problems are solved by an adhesive composition containing a moisture-curable resin and a silane coupling agent having a nitrogen-containing heterocycle, and completed the present invention.
- the present invention provides the following [1] to [19].
- a silane coupling agent having a nitrogen-containing heterocycle [2] The adhesive composition according to [1], wherein the silane coupling agent has at least one of a triazole skeleton and a triazine skeleton. [3] The adhesive composition according to [1] or [2], wherein the content of the silane coupling agent is 0.1 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the adhesive composition. .
- the moisture-curable resin contains at least one selected from the group consisting of a moisture-curable resin having a polyether skeleton, a moisture-curable resin having a polycarbonate skeleton, and a moisture-curable resin having a polyester skeleton. , the adhesive composition according to any one of [1] to [3]. [5] The adhesive composition according to any one of [1] to [4], wherein the moisture-curable resin contains an isocyanate group-containing resin having an isocyanate group in the molecule. [6] The adhesive composition according to [5], wherein the moisture-curable resin contains an isocyanate group-containing resin having an isocyanate group and a (meth)acryloyl group in the molecule.
- the adhesion according to any one of [7] to [9], wherein the content ratio of the radically polymerizable compound to the moisture-curable resin in the adhesive composition is 1/10 or more and 15/10 or less. agent composition.
- the photopolymerization initiator is at least one selected from benzophenone compounds, acetophenone compounds, acylphosphine oxide compounds, titanocene compounds, oxime ester compounds, benzoin ether compounds, and thioxanthone.
- the adhesive composition according to any one of [7] to [10].
- FIG.1 (a) is a top view
- FIG.1(b) is a side view.
- FIG.1(b) is a schematic side view which shows the impact-resistant evaluation method.
- the adhesive composition of the present invention contains a moisture-curable resin and a silane coupling agent. A detailed description will be given below.
- a silane coupling agent has a nitrogen-containing heterocycle.
- the impact resistance of the adhesive composition can be sufficiently exhibited even when the adherend of the adhesive composition is a metal.
- the metal atoms of the adherend are coordinated to the nitrogen atoms, making it difficult for the adhesive composition to peel off from the adherend.
- the number of nitrogen atoms in one molecule of the silane coupling agent is not particularly limited, and may be 1 or more, but preferably 2 or more.
- the upper limit of the number of nitrogen atoms is preferably 10 or less, more preferably 8 or less.
- the silane coupling agent having a nitrogen-containing heterocycle preferably has a nitrogen-containing aromatic heterocycle from the viewpoint of further improving the impact resistance of the adhesive composition, and contains at least one of a triazole skeleton and a triazine skeleton. It is more preferable to have at least one of a benzotriazole skeleton and a triazine skeleton.
- the silane coupling agent preferably has a reactive silyl group in addition to the nitrogen-containing heterocycle.
- the reactive silyl group preferably has at least one of an alkoxy group and a hydroxyl group bonded to a silicon atom, and more preferably has an alkoxy group bonded to a silicon atom.
- silane coupling agent having a triazole skeleton is preferably an organosilicon compound having a benzotriazole skeleton and a reactive silyl group, for example represented by the following general formula (1).
- R 1 to R 4 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
- R 1 and R 2 , R 2 and R 3 , or R 3 and R 4 may be combined to form an aliphatic or aromatic ring skeleton.
- the total carbon number of R 1 and R 2 , R 2 and R 3 , or R 3 and R 4 is 2-12.
- R 5 represents an organic group having 1 to 20 carbon atoms
- R 6 represents an alkyl group having 1 to 10 carbon atoms.
- R7 represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom.
- a represents an integer of 1 to 3;
- n represents an integer of 1 or 2;
- a is preferably 2 or 3, more preferably 3.
- a is 2 or 3, the adhesiveness to the adherend and the impact resistance can be easily improved.
- n is 1, R 5 is divalent and when n is 2, R 5 is trivalent.
- n is preferably one.
- R 5 is preferably an aliphatic group and may have a linear structure, a cyclic structure, or a branched structure.
- R5 may be a hydrocarbon group, but may also have a heteroatom such as a nitrogen atom, an oxygen atom, a sulfur atom, etc.
- an ether bond, an ester bond, an amide bond It may have a thiol bond, a urethane bond, a urea bond, a hydroxyl group, or the like.
- R 5 is more preferably a divalent saturated hydrocarbon group, more preferably an alkylene group.
- R 5 has 1 to 15 carbon atoms.
- Specific examples of the alkylene group include methylene group, ethylene group, n-propylene group, butylene group, hexylene group, heptylene group, octylene group, dodecylene group and the like.
- R7 is preferably an alkyl group.
- the alkyl group of R 6 and R 7 preferably has 1 to 8 carbon atoms, more preferably 1 to 4 carbon atoms, still more preferably 1 to 2 carbon atoms, and most preferably 1 carbon atom. .
- R 1 to R 4 are preferably hydrogen atoms.
- Specific examples of alkyl groups for R 6 and R 7 include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, pentyl group, neopentyl group, isopentyl group and sec-pentyl group. , hexyl group, heptyl group, octyl group and the like.
- Specific examples of alkyl groups for R 1 to R 4 include those having 1 to 6 carbon atoms.
- n is 1, R 1 to R 4 are hydrogen atoms, a is 2 or 3, R 6 and R 7 are each independently a methyl group or an ethyl group Compounds selected from are particularly preferred.
- silane coupling agent having a triazine skeleton is preferably, for example, a compound having a triazine skeleton and a reactive silyl group represented by the following general formula (2).
- R 8 represents an organic group having 1 to 20 carbon atoms
- R 9 represents an alkyl group having 1 to 10 carbon atoms
- R 10 represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom
- R 11 and R 12 each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.
- a represents an integer of 1 to 3;
- n represents an integer of 1 or 2;
- a is preferably 2 or 3, more preferably 3.
- a is 2 or 3, the adhesiveness to the adherend is likely to be enhanced.
- n is 1, R 8 is divalent and when n is 2, R 8 is trivalent.
- n is preferably one.
- R 8 is preferably an aliphatic group, and may have a linear structure, a cyclic structure, or a branched structure.
- R 8 may be a hydrocarbon group, but may also have a heteroatom such as a nitrogen atom, an oxygen atom, a sulfur atom, etc.
- an ether bond, an ester bond, an amide bond It may have a thiol bond, a urethane bond, a urea bond, a hydroxyl group, or the like.
- R 8 is more preferably a divalent saturated hydrocarbon group, more preferably an alkylene group.
- R 8 has 1 to 15 carbon atoms.
- Specific examples of the alkylene group include methylene group, ethylene group, n-propylene group, butylene group, hexylene group, heptylene group, octylene group, dodecylene group and the like.
- R 10 is preferably an alkyl group.
- the alkyl group of R 9 and R 10 preferably has 1 to 8 carbon atoms, more preferably 1 to 4 carbon atoms, still more preferably 1 to 2 carbon atoms, and most preferably 1 carbon atom. .
- R 11 and R 12 are preferably hydrogen atoms.
- Specific examples of alkyl groups for R 9 and R 10 include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, pentyl group, neopentyl group, isopentyl group and sec-pentyl group. , hexyl group, heptyl group, octyl group and the like.
- Specific examples of the alkyl group for R 11 and R 12 are the same as those shown for R 9 and R 10 .
- n is 1, R 11 and R 12 are hydrogen atoms, a is 2 or 3, and R 9 and R 10 are each independently from a methyl group or an ethyl group. Selected compounds are particularly preferred.
- silane coupling agent such as "X-12-1214A” (manufactured by Shin-Etsu Chemical Co., Ltd.), "VD-5" (manufactured by Shikoku Kasei Co., Ltd.), and the like. Any one of the above silane coupling agents may be used alone, or two or more thereof may be used in combination.
- the content of the silane coupling agent is preferably 0.1 parts by mass or more and 5 parts by mass or less, more preferably 0.2 parts by mass or more and 3 parts by mass or less, relative to 100 parts by mass of the adhesive composition. Part by mass or more and 2.5 parts by mass or less is more preferable.
- the content of the silane coupling agent is at least the above lower limit, excellent impact resistance can be exhibited even when the adhesive composition is applied to a metal plate.
- the content of the silane coupling agent is equal to or less than the above upper limit, the adhesive strength of the adhesive composition can be kept at a certain level or higher.
- Moisture-curable resins contained in the adhesive composition of the present invention include isocyanate group-containing resins containing isocyanate groups in the molecule, hydrolyzable silyl group-containing resins containing hydrolyzable silyl groups in the molecule, and the like. is mentioned.
- the isocyanate group-containing resin is cured when the isocyanate group in the molecule reacts with water present in the air or on the adherend.
- the hydrolyzable silyl group-containing resin is cured when the hydrolyzable silyl group in the molecule reacts with water present in the air or on the adherend.
- isocyanate group-containing resins are preferred. Moisture-curable resins may be used singly or in combination of two or more.
- the isocyanate group contained in the isocyanate group-containing resin is not particularly limited, and may be either an aromatic isocyanate group or an aliphatic isocyanate group. Among these, the aromatic isocyanate group is preferred.
- the aromatic isocyanate group is an isocyanate group directly bonded to an aromatic ring, and the aliphatic isocyanate group is an isocyanate group directly bonded to an aliphatic carbon atom.
- the aromatic isocyanate group is an isocyanate group derived from an aromatic isocyanate compound, and the details of the aromatic isocyanate compound are as described later.
- the aliphatic isocyanate group is an isocyanate group derived from an aliphatic isocyanate compound, and the details of the aliphatic isocyanate compound are as described later.
- the isocyanate group-containing resin may further have a (meth)acryloyl group.
- the moisture-curable resin can be cured by energy ray irradiation. Moreover, it becomes easy to improve adhesive strength and impact resistance.
- At least a part of the isocyanate group-containing resin should have a (meth)acryloyl group. Therefore, as the isocyanate group-containing resin, an isocyanate group-containing resin having (meth)acryloyl groups and an isocyanate group-containing resin having no (meth)acryloyl groups may be used in combination.
- (meth)acryloyl group means an acryloyl group or a methacryloyl group, and the same applies to other similar terms.
- the (meth)acryloyl group of the isocyanate group-containing resin is preferably derived from a compound having a (meth)acryloyl group, which will be described later.
- the moisture-curable resin preferably has a (meth)acryloyl group at its end.
- the (meth)acryloyl groups of the moisture-curable resin are preferably reacted by photocuring, which will be described later, but need not necessarily be reacted by photocuring. That is, the moisture-curable resins may react with each other by photocuring, or may react with a radically polymerizable compound to be described later, but may not react.
- the isocyanate group-containing resin has a (meth)acryloyl group
- it has an isocyanate group at one end and a (meth)acryloyl group at one end from the viewpoint of easily improving the impact resistance and adhesive strength of the adhesive composition.
- ) preferably has an acryloyl group.
- the moisture-curable resin contained in the adhesive composition of the present invention is selected from the group consisting of a moisture-curable resin having a polyether skeleton, a moisture-curable resin having a polycarbonate skeleton, and a moisture-curable resin having a polyester skeleton. It is preferable to include at least one selected. Use of these moisture-curable resins makes it easier to improve impact resistance and adhesive strength. Any one of these moisture-curable resins may be contained alone, or two of them may be used in combination.
- a moisture-curable resin having a polycarbonate skeleton or a moisture-curable resin having a polyester skeleton it is more preferable to contain a moisture-curable resin.
- the moisture-curable resin is preferably a moisture-curable urethane resin. Therefore, the moisture-curable resin preferably has urethane bonds in addition to isocyanate groups. By using a moisture-curable urethane resin as the moisture-curable resin, it is easy to improve impact resistance and the like. Also, the moisture-curable urethane resin may have a (meth)acryloyl group in addition to the isocyanate group and the urethane bond. By using a moisture-curable urethane resin having a (meth)acryloyl group, it becomes easier to further improve impact resistance and adhesiveness.
- the moisture-curable urethane resin it is also preferable to use both a moisture-curable urethane resin having a (meth)acryloyl group and a moisture-curable urethane resin having no (meth)acryloyl group.
- a moisture-curable urethane resin having a (meth)acryloyl group it is also preferable to use both a moisture-curable urethane resin having a (meth)acryloyl group and a moisture-curable urethane resin having no (meth)acryloyl group.
- the case where the moisture-curable resin is a moisture-curable urethane resin will be described in more detail below.
- the moisture-curable urethane resin for example, one obtained by reacting a polyol compound and a polyisocyanate compound is preferable.
- the moisture-curable urethane resin has a (meth)acryloyl group
- it is preferably obtained by reacting a compound having a (meth)acryloyl group in addition to a polyol compound and a polyisocyanate compound.
- a reaction product obtained by reacting a polyol compound and a polyisocyanate compound may be further reacted with a compound having an isocyanate group or a hydroxyl group and a (meth)acryloyl group.
- a reaction product obtained by reacting a polyol compound with a compound having an isocyanate group and a (meth)acryloyl group may be reacted with the polyisocyanate compound.
- a reaction product obtained by reacting a polyisocyanate compound with a compound having a hydroxyl group and a (meth)acryloyl group may be reacted with a polyol compound.
- the moisture-curable urethane resin may be obtained by concurrently reacting a polyol compound, a polyisocyanate compound, and a compound having an isocyanate group or a hydroxyl group and a (meth)acryloyl group.
- a moisture-curable urethane resin having no (meth)acryloyl group may be synthesized together.
- the reaction of the above-described polyol compound with a polyisocyanate compound, or the reaction of a polyol compound with a polyisocyanate compound and a compound having a (meth)acryloyl group, is usually carried out by hydroxyl groups (OH) and isocyanate groups in these compounds.
- OH hydroxyl groups
- a polyether skeleton is introduced into the moisture-curable urethane resin, resulting in a moisture-curable urethane resin having a polyether skeleton. do it. More specifically, a urethane resin having a polyether skeleton is obtained by reacting a polyether polyol having two or more hydroxyl groups in one molecule with a polyisocyanate compound having two or more isocyanate groups in one molecule.
- a polyester skeleton is introduced into the moisture-curable urethane resin, and a moisture-curable urethane resin having a polyester skeleton may be obtained.
- a polycarbonate skeleton may be introduced into the moisture-curable urethane resin by using a polycarbonate polyol as a polyol compound that is a raw material of the moisture-curable urethane resin.
- Polyether polyols for obtaining a moisture-curable urethane resin having a polyether skeleton include, for example, ethylene glycol, propylene glycol, ring-opening polymer of tetrahydrofuran, ring-opening polymer of 3-methyltetrahydrofuran, and these or their Examples thereof include random copolymers or block copolymers of derivatives, bisphenol-type polyoxyalkylene modified products, and the like.
- propylene glycol or a ring-opening polymer of 3-methyltetrahydrofuran is preferable from the viewpoint of easily improving the applicability of the light and moisture-curable resin composition.
- the bisphenol-type polyoxyalkylene modified product is a polyether polyol obtained by addition reaction of an alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, isobutylene oxide, etc.) to the active hydrogen portion of the bisphenol-type molecular skeleton.
- the polyether polyol may be a random copolymer or a block copolymer.
- one or more alkylene oxides are preferably added to both ends of the bisphenol-type molecular skeleton.
- the bisphenol type is not particularly limited, and includes A type, F type, S type and the like, preferably bisphenol A type.
- the polyisocyanate compound mentioned above can be used as a polyisocyanate compound.
- the moisture-curable urethane resin having a polyether skeleton preferably further includes one obtained using a polyol compound having a structure represented by the following general formula (3).
- a polyol compound having a structure represented by the following general formula (3) it is possible to obtain a light and moisture-curable resin composition with excellent adhesiveness and a cured product that is flexible and has good elongation, and is radically polymerizable. It becomes a thing excellent in compatibility with a compound.
- a polyether polyol composed of propylene glycol, a ring-opening polymerization compound of a tetrahydrofuran (THF) compound, or a ring-opening polymerization compound of a tetrahydrofuran compound having a substituent such as a methyl group, and propylene glycol is more preferable.
- THF tetrahydrofuran
- propylene glycol is more preferable.
- R 13 represents a hydrogen atom, a methyl group, or an ethyl group
- l is an integer of 0 to 5
- m is an integer of 1 to 500
- n is an integer of 1 to 10.
- l is preferably 0-4, m is preferably 50-200, and n is preferably 1-5.
- the case where l is 0 means the case where the carbon bonded to R 13 is directly bonded to oxygen.
- the sum of n and l is more preferably 1 or more, more preferably 1 to 3.
- R 13 is more preferably a hydrogen atom or a methyl group, particularly preferably a methyl group.
- a polycarbonate diol is preferable as a polycarbonate polyol for obtaining a moisture-curable urethane resin having a polycarbonate skeleton.
- Specific examples of polycarbonate diols include compounds represented by the following general formula (4).
- R is a divalent hydrocarbon group having 4 to 16 carbon atoms, and n is an integer of 2 to 500.
- R is preferably an aliphatic saturated hydrocarbon group.
- R is an aliphatic saturated hydrocarbon group, heat resistance and flexibility are likely to be improved. In addition, yellowing or the like due to heat deterioration or the like is less likely to occur, and weather resistance is improved.
- R composed of an aliphatic saturated hydrocarbon group may have a chain structure or a cyclic structure, but preferably has a chain structure. In addition, R in the chain structure may be linear or branched. n is preferably 5-200, more preferably 10-150, even more preferably 20-50.
- R contained in the polycarbonate polyol constituting the moisture-curable urethane resin may be used singly or in combination of two or more.
- At least a part thereof is preferably a chain aliphatic saturated hydrocarbon group having 6 or more carbon atoms.
- preferably two or more types of R are contained in one molecule, and more preferably two or three types of R are contained in one molecule.
- the chain aliphatic saturated hydrocarbon group having 6 or more carbon atoms preferably has 6 or more and 12 or less carbon atoms, more preferably 6 or more and 10 or less carbon atoms, and still more preferably 6 or more and 8 or less carbon atoms.
- R may be linear groups such as tetramethylene group, pentylene group, hexamethylene group, heptamethylene group, octamethylene group, nonamethylene group, and decamethylene group, and for example, 3-methylpentylene group. It may be branched such as a methylpentylene group such as a methylpentylene group or a methyloctamethylene group. Plural R's in one molecule may be the same or different. Furthermore, from the viewpoint of increasing the elastic modulus to a certain value or more, R preferably contains a branched aliphatic saturated hydrocarbon group, and from the viewpoint of weather resistance, R preferably contains a linear saturated aliphatic hydrocarbon group. is preferred. Branched R and linear R may be used in combination in the polycarbonate polyol. In addition, polycarbonate polyol may be used individually by 1 type, and may be used in combination of 2 or more type.
- Polyester polyols for obtaining moisture-curable urethane resins having a polyester skeleton include, for example, polyester polyols obtained by reacting a polycarboxylic acid with a polyol, poly- ⁇ - obtained by ring-opening polymerization of ⁇ -caprolactone, and caprolactone polyol.
- the polyester polyol is preferably a polyester diol.
- divalent aromatic carboxylic acids such as terephthalic acid, isophthalic acid, 1,5-naphthalic acid, and 2,6-naphthalic acid, succinic acid, and glutaric acid.
- adipic acid pimelic acid, suberic acid, azelaic acid, sebacic acid
- polyester polyols used as raw materials for polyester polyols include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, cyclohexanediol, and the like.
- the moisture-curable urethane resin one type of polyol compound may be used alone, or two or more types may be used in combination.
- two or more selected from a polyether skeleton, a polycarbonate skeleton, and a polyester skeleton may be introduced into the moisture-curable urethane resin. That is, the moisture-curable urethane resin may be a moisture-curable urethane resin having two or more selected from a polyether skeleton, a polycarbonate skeleton, and a polyester skeleton in one molecule.
- a polyisocyanate compound that is a raw material of a moisture-curable urethane resin has two or more isocyanate groups in one molecule, and preferably has two isocyanate groups.
- Polyisocyanate compounds include aromatic polyisocyanate compounds and aliphatic polyisocyanate compounds. Examples of aromatic polyisocyanate compounds include diphenylmethane diisocyanate, liquid modified diphenylmethane diisocyanate, tolylene diisocyanate, and naphthalene-1,5-diisocyanate.
- the aromatic polyisocyanate compound may be a multimer of these compounds, polymeric MDI, or the like. Diphenylmethane diisocyanate is preferred as the aromatic polyisocyanate compound.
- aliphatic polyisocyanate compounds include hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, norbornane diisocyanate, transcyclohexane-1,4-diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and cyclohexane diisocyanate. , bis(isocyanatomethyl)cyclohexane, dicyclohexylmethane diisocyanate, and the like. Aliphatic polyisocyanate compounds may be those obtained by increasing these.
- a polyisocyanate compound may be used individually by 1 type, and may be used in combination of 2 or more type.
- the moisture-curable resin in synthesizing a moisture-curable urethane resin, if an aromatic polyisocyanate compound is used, the moisture-curable resin contains an aromatic isocyanate group, and if an aliphatic polyisocyanate compound is used, the moisture-curable resin contains an aliphatic polyisocyanate group. containing group isocyanate groups. Therefore, it is preferable to use an aromatic polyisocyanate compound as the polyisocyanate compound.
- the compound having a (meth)acryloyl group used as a raw material when synthesizing a moisture-curable urethane resin having a (meth)acryloyl group preferably contains either an isocyanate group or a hydroxyl group, as described above.
- a compound having an isocyanate group and a (meth)acryloyl group is preferable from the viewpoint of easily introducing the (meth)acryloyl group into the curable urethane resin.
- Examples of compounds having an isocyanate group and a (meth)acryloyl group include compounds represented by the following general formula (5).
- R 14 represents hydrogen or a methyl group
- R 15 represents a C 1-10 divalent saturated hydrocarbon group which may have an ether bond.
- the compound having an isocyanate group and a (meth)acryloyl group preferably includes 2-(meth)acryloyloxyethyl isocyanate, 2-(meth)acryloyloxyethoxyethyl isocyanate, and the like.
- Compounds having a hydroxyl group and a (meth)acryloyl group which are raw materials for moisture-curable urethane resins, include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4 - hydroxyalkyl (meth)acrylates such as hydroxybutyl (meth)acrylate.
- compounds having these hydroxyl groups and (meth)acryloyl groups are compounds obtained by reacting various diisocyanate compounds at a ratio such that the isocyanate group/hydroxyl group (molar ratio) is 2, etc., and moisture-curable urethane. You may use it as a compound which has a (meth)acryloyl group used as the raw material of resin.
- the content ratio (mass part ratio) of the isocyanate group-containing resin having a (meth)acryloyl group to the isocyanate group-containing resin having no (meth)acryloyl group is preferably 1/20 or more and 1/1 or less. , preferably 1/15 or more and 1/2 or less, and preferably 1/12 or more and 1/3 or less.
- the weight average molecular weight of the moisture-curable resin is not particularly limited, it is preferably 1,000 or more and 50,000 or less, more preferably 2,000 or more and 30,000 or less, and still more preferably 3,000 or more and 20,000 or less.
- the weight average molecular weight is at least the above lower limit, the crosslink density does not become too high during curing, and the flexibility after curing tends to be high.
- the weight average molecular weight is at least the above lower limit, it has a certain level of hardness or more, and it becomes easy to ensure excellent shape retention.
- a weight average molecular weight is equal to or less than the above upper limit, so that the adhesive composition tends to have moderate fluidity even at room temperature (e.g., 25° C.) before curing, and the applicability is improved.
- a weight average molecular weight is a value which measures by a gel permeation chromatography (GPC), and is calculated
- GPC gel permeation chromatography
- Shodex LF-804 manufactured by Showa Denko KK
- tetrahydrofuran is mentioned as a solvent used in GPC.
- the content of the moisture-curable resin in the adhesive composition is, based on 100 parts by mass of the adhesive composition, for example 40 parts by mass or more and 95 parts by mass or less, preferably 45 parts by mass or more and 90 parts by mass or less, more preferably It is 50 parts by mass or more and 75 parts by mass or less.
- the content of the moisture-curable resin is at least the above lower limit, an adhesive composition having excellent adhesive strength and impact resistance can be obtained.
- the content of the moisture-curable resin is equal to or less than the above upper limit, an adhesive composition having excellent shape retention can be obtained.
- the light and moisture-curable resin composition of the present invention preferably contains a radically polymerizable compound.
- a radically polymerizable compound By containing a radically polymerizable compound, the light moisture-curable resin composition can impart good shape retention to the adhesive composition, and can create an adhesive with excellent practicality.
- the radically polymerizable compound is not particularly limited, for example, various aliphatic (meth)acrylic compounds can be used, and aliphatic urethane (meth)acrylates and the like are preferably used. The aliphatic urethane (meth)acrylate does not have residual isocyanate groups.
- Other radically polymerizable compounds may be monofunctional or polyfunctional such as bifunctional.
- aliphatic urethane (meth)acrylate for example, one obtained by reacting an isocyanate compound with a (meth)acrylic acid derivative having a hydroxyl group can be used.
- (meth)acrylic acid derivatives having a hydroxyl group include dihydric alcohols such as ethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, and polyethylene glycol. and mono(meth)acrylates of trihydric alcohols such as trimethylolethane, trimethylolpropane and glycerin.
- Isocyanate compounds used to obtain aliphatic urethane (meth)acrylates include butane isocyanate, hexane isocyanate, octane isocyanate, alkane monoisocyanate such as decane isocyanate (alkane preferably has about 3 to 12 carbon atoms), cyclopentane Aliphatic monoisocyanates such as isocyanate, cyclohexane isocyanate, cycloaliphatic monoisocyanates such as isophorone monoisocyanate.
- the monofunctional aliphatic urethane (meth)acrylate is preferably a urethane (meth)acrylate obtained by reacting the monoisocyanate compound described above with a mono(meth)acrylate of a dihydric alcohol.
- a urethane (meth)acrylate obtained by reacting the monoisocyanate compound described above with a mono(meth)acrylate of a dihydric alcohol and preferred specific examples thereof include 1,2-ethanediol 1-acrylate 2-(N-alkyl carbamate) such as 1,2-ethanediol 1-acrylate 2-(N-butyl carbamate).
- radically polymerizable compound compounds other than urethane (meth)acrylate can be used, and for example, (meth)acrylic acid ester compounds other than the above may be used.
- the (meth)acrylic acid ester compound may be monofunctional or polyfunctional, but is preferably monofunctional.
- Examples of monofunctional (meth)acrylate compounds include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isononyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, isomyristyl (meth)acrylates, alkyl (meth)acrylates such as stearyl (meth)acrylate, cyclohexyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, 3,3,5-trimethylcyclohexyl (meth)acrylate, isoborny
- acrylate methoxyethylene glycol (meth) acrylate, ethoxyethylene glycol (meth) acrylate, alkoxyethylene glycol (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth)
- Polyoxyethylene-based (meth)acrylates such as acrylates, ethoxydiethylene glycol (meth)acrylates, ethoxytriethylene glycol (meth)acrylates, and ethoxypolyethylene glycol (meth)acrylates can be used.
- monofunctional (meth)acrylic acid ester compounds include tetrahydrofurfuryl (meth)acrylate, alkoxylated tetrahydrofurfuryl (meth)acrylate, cyclic trimethylolpropane formal (meth)acrylate, 3-ethyl-3- (Meth)acrylates having a heterocyclic structure such as oxetanylmethyl (meth)acrylate, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,3,3-tetrafluoropropyl (meth)acrylate, 1H , 1H,5H-octafluoropentyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, 2-(meth)acryloyloxyethyl succinate, 2-(meth)acryloyloxyethyl- 2-Hydroxypropyl phthalate, g
- bifunctional (meth)acrylate compounds include 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di( meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 2-n-butyl-2-ethyl-1,3-propanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, dimethyloldicyclopentadienyl di(meth)acrylate, neopentyl
- tri- or higher functional ones include, for example, trimethylolpropane tri(meth)acrylate, ethylene oxide-added trimethylolpropane tri(meth)acrylate, propylene oxide-added trimethylolpropane tri(meth) ) acrylate, caprolactone-modified trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, ethylene oxide-added isocyanuric acid tri(meth)acrylate, glycerin tri(meth)acrylate, propylene oxide-added glycerin tri(meth)acrylate, tris (Meth)acryloyloxyethyl phosphate, ditrimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate
- radically polymerizable compounds other than those mentioned above can also be used as appropriate.
- Other radically polymerizable compounds include, for example, N,N-dimethyl(meth)acrylamide, N-(meth)acryloylmorpholine, N-hydroxyethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N- (Meth)acrylamide compounds such as isopropyl (meth)acrylamide and N,N-dimethylaminopropyl (meth)acrylamide; and vinyl compounds such as N-vinyl-2-pyrrolidone and N-vinyl- ⁇ -caprolactam. Epoxy (meth)acrylate and the like can also be used.
- the content of the radically polymerizable compound is preferably 4 parts by mass or more, more preferably 9 parts by mass or more, and even more preferably 24 parts by mass or more with respect to 100 parts by mass of the adhesive composition. By making it more than these lower limits, it becomes easy to provide a favorable shape retention property to an adhesive composition. In addition, it becomes easier to improve the applicability of the adhesive composition.
- the content of the radically polymerizable compound is preferably 59 parts by mass or less, more preferably 50 parts by mass or less, and even more preferably 45 parts by mass or less with respect to 100 parts by mass of the adhesive composition. By setting the content of the radically polymerizable compound to these upper limits or less, the moisture-curable resin in the adhesive composition can be increased to a certain amount or more, making it easier to obtain an adhesive composition having excellent adhesive strength and impact resistance. .
- the content ratio (mass ratio) of the radical polymerizable compound to the moisture-curable resin in the adhesive composition is preferably 1/10 or more and 15/10 or less, more preferably 2/10 or more and 10/10 or less, and 4/ 10 or more and 9/10 or less is more preferable.
- the content ratio of the radically polymerizable compound to the moisture-curable resin is at least the above lower limit, it becomes easier to impart good shape retention to the adhesive composition. In addition, it becomes easier to improve the applicability of the adhesive composition.
- the content ratio of the radically polymerizable compound to the moisture-curable resin is equal to or less than the above upper limit, it becomes easier to obtain an adhesive composition having excellent adhesive strength and impact resistance.
- the adhesive composition of the present invention may further contain a photopolymerization initiator.
- a photopolymerization initiator By containing a photopolymerization initiator, the adhesive composition can appropriately impart photocurability and the like to the adhesive composition.
- the adhesive composition contains a radically polymerizable compound, it is preferred to use a photopolymerization initiator.
- photopolymerization initiators include benzophenone-based compounds, acetophenone-based compounds, acylphosphine oxide-based compounds, titanocene-based compounds, oxime ester-based compounds, benzoin ether-based compounds, and thioxanthone.
- Examples of commercially available photopolymerization initiators include IRGACURE 184, IRGACURE 369, IRGACURE 379, IRGACURE 651, IRGACURE 784, IRGACURE 819, IRGACURE 907, IRGACURE 2959, IRGACURE OXE01, Lucirin TPO (all manufactured by BASF), benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether (both manufactured by Tokyo Kasei Kogyo Co., Ltd.), and the like.
- the content of the photopolymerization initiator in the adhesive composition is preferably 0.01 parts by mass or more and 8 parts by mass or less, more preferably 0.1 parts by mass or more and 6 parts by mass with respect to 100 parts by mass of the adhesive composition. Below, more preferably 0.4 parts by mass or more and 4 parts by mass or less.
- the content of the photopolymerization initiator is within these ranges, the resulting adhesive composition has excellent shape retention. Moreover, by setting the content within the above range, the photoradical polymerizable compound is appropriately cured, and the adhesive strength is likely to be improved.
- the adhesive composition of the present invention may contain a moisture curing accelerating catalyst that accelerates the moisture curing reaction of the moisture curing resin.
- a moisture curing acceleration catalyst By using a moisture curing acceleration catalyst, the adhesive composition becomes more excellent in moisture curability, making it easier to increase adhesive strength.
- Specific examples of moisture curing acceleration catalysts include amine-based compounds and metal-based catalysts.
- Examples of amine compounds include compounds having a morpholine skeleton such as di(methylmorpholino) diethyl ether, 4-morpholinopropyl morpholine, 2,2′-dimorpholino diethyl ether, bis(2-dimethylaminoethyl) ether, 1,2 -dimethylamino group-containing amine compounds having two dimethylamino groups such as bis(dimethylamino)ethane, triethylamine, 1,4-diazabicyclo[2.2.2]octane, 2,6,7-trimethyl-1,4 -diazabicyclo[2.2.2]octane and the like.
- a morpholine skeleton such as di(methylmorpholino) diethyl ether, 4-morpholinopropyl morpholine, 2,2′-dimorpholino diethyl ether, bis(2-dimethylaminoethyl) ether, 1,2 -dimethylamin
- metal-based catalysts examples include tin compounds such as di-n-butyltin dilaurate, di-n-butyltin diacetate and tin octylate; zinc compounds such as zinc octoate and zinc naphthenate; zirconium tetraacetylacetonate; copper naphthenate; Other metal compounds such as cobalt naphthenate are included.
- the content of the moisture curing acceleration catalyst in the adhesive composition is preferably 0.1 parts by mass or more and 10 parts by mass or less, more preferably 0.2 parts by mass or more and 8 parts by mass with respect to 100 parts by mass of the adhesive composition. Below, more preferably 0.3 parts by mass or more and 5 parts by mass or less.
- the adhesive composition of the present invention may contain fillers.
- a filler By containing a filler, the adhesive composition of the present invention has suitable thixotropic properties, which facilitates good shape retention after application.
- a particulate filler may be used as the filler.
- Preferred fillers include inorganic fillers such as silica, talc, titanium oxide, zinc oxide, and calcium carbonate. Among these, silica is preferable because the adhesive composition has excellent ultraviolet transmittance.
- the filler may be subjected to hydrophobic surface treatment such as silylation treatment, alkylation treatment, and epoxidation treatment.
- a filler may be used individually by 1 type, and 2 or more types may be used in combination.
- the content of the filler is preferably 0.5 parts by mass or more and 30 parts by mass or less, more preferably 1 part by mass or more and 25 parts by mass or less, and still more preferably 2 parts by mass or more with respect to 100 parts by mass of the adhesive composition. It is 15 parts by mass or less.
- the adhesive composition of the present invention includes, in addition to the components described above, a coupling agent such as a titanate coupling agent, a zirconate coupling agent, and a silane coupling agent having no nitrogen-containing heterocycle, wax particles, Other additives such as ionic liquids, colorants, expanded particles, expanded particles, reactive diluents, antioxidants, and radical scavengers may also be included.
- the adhesive composition may be diluted with a solvent if necessary. When the adhesive composition is diluted with a solvent, each amount (parts by weight, % by weight) of the adhesive composition is on a solids basis, ie, parts by weight, % by weight excluding the solvent.
- a mixer is used to prepare a moisture-curable resin, a silane coupling agent having a nitrogen-containing heterocycle, and, if necessary, a radically polymerizable compound.
- a method of mixing with other additives such as a photopolymerization initiator, a moisture curing acceleration catalyst, a filler, and the like.
- mixers include homodispers, homomixers, universal mixers, planetary mixers (planetary stirring devices), kneaders, and three rolls.
- the adhesive composition of the present invention is preferably cured and used as a cured product.
- the adhesive composition of the present invention has at least moisture curability. Therefore, the adhesive composition can be obtained, for example, by disposing the adhesive composition or the semi-cured adhesive composition between a pair of adherends and at least by moisture-curing the adhesive composition (cured body). , a pair of adherends may be adhered.
- the adhesive composition of the present invention preferably has photocurability, and preferably has photocurability by containing a radically polymerizable compound. That is, the adhesive composition is preferably used as a light moisture curing type. Therefore, it is preferable that the adhesive composition of the present invention is photocured by light irradiation to, for example, a B-stage state (semi-cured state), and then further cured by moisture to be completely cured before use.
- the adhesive composition is arranged between the adherends, and when the adherends are to be bonded together, it is applied to one of the adherends, and then photocured by light irradiation, for example, in the B stage.
- the application of the adhesive composition to the adherend is preferably performed, for example, with a dispenser, but is not particularly limited.
- the light to be irradiated during photocuring is not particularly limited as long as it is light that cures one or both of the moisture-curable resin and the radically polymerizable compound, but ultraviolet rays are preferable.
- the adhesive composition when it is to be fully cured by moisture, it may be left in the air for a predetermined period of time.
- the adhesive composition of the present invention is used, for example, as an adhesive for electronic parts. Moreover, the adhesive composition of the present invention is preferably used as an adhesive for electronic devices, especially portable electronic devices. Electronic parts or portable electronic devices in which the adhesive composition of the present invention is used preferably have a cured product of the adhesive composition.
- the adherend to which the adhesive composition is used is not particularly limited, but is preferably a part constituting a portable electronic device, and the part is preferably an electronic part.
- the material of the adherend may be metal, glass, plastic, or the like, but it is preferable that at least any of the adherends is metal.
- the shape of the adherend is not particularly limited, and examples thereof include film-like, sheet-like, plate-like, panel-like, tray-like, rod-like, box-like, and housing-like shapes.
- portable electronic devices include, but are not limited to, mobile phones such as smartphones, digital cameras, wearable terminals, portable game devices, tablet computers, notebook computers, action cameras, and the like, among which smartphones and wearable terminals. is preferred. Since the adhesive composition of the present invention has good impact resistance, it is particularly suitable for portable electronic devices.
- An electronic component generally has a substrate, so the electronic component using the adhesive composition of the present invention preferably has a cured adhesive composition and a substrate.
- Various electronic circuits and the like are generally provided on the substrate.
- electronic devices such as portable electronic devices in which the adhesive composition of the present invention is used preferably have a cured product of the adhesive composition of the present invention and a substrate.
- substrates may be used as adherends, and the substrates may be bonded together via the adhesive composition of the present invention. (eg, housing) or the like.
- the adhesive composition of the present invention may be used, for example, to bond substrates to substrates to obtain assembled parts, such as inside electronic equipment.
- the assembly part thus obtained has a first substrate, a second substrate, and the cured product of the present invention, wherein at least a portion of the first substrate is at least a portion of the second substrate. is joined through a hardened body.
- the adhesive compositions were evaluated as follows.
- PUSH adhesive strength As shown in FIG. 1(a), a first substrate 11 having a size of 90 mm ⁇ 50 mm and a thickness of 5 mm and a circular hole 11A having a diameter of 12 mm in the center and a second substrate 12 having a size of 50 mm ⁇ 50 mm and a thickness of 5 mm were prepared.
- the first substrate 11 was made of aluminum (AL) and the second substrate 12 was made of polycarbonate (PC).
- the adhesive composition 10 was formed into a rectangular frame of 20 mm ⁇ 20 mm with a width of 1 mm ⁇ 0.2 mm and a height of 0.25 mm ⁇ 0.05 mm so as to surround the center of the hole 11A of the first substrate 11. was applied.
- the adhesive composition 10 was photocured by irradiating 1000 mJ/cm 2 of ultraviolet rays using a UV-LED (wavelength 365 nm) within 1 minute after the completion of application.
- a gap material (not shown) with a height of 0.2 mm and an adhesive composition 10 are interposed so that the center positions of the first and second substrates 11 and 12 are aligned, and the first substrate 11 A second substrate 12 is superimposed on the adhesive composition 10, and a weight of 2 kg is further left still on the second substrate 12 for 10 seconds to bond the first and second substrates 11 and 12 to the adhesive composition 10. It was crimped through After that, the weight of 2 kg was removed, and the adhesive composition 10 was moisture-cured by leaving it at 25° C. and 50% RH for 24 hours to obtain a sample 13 for measurement. After moisture curing, the gap material was removed from the sample 13 for measurement.
- the first substrate 11 is arranged on the upper side and the second substrate 12 is arranged on the lower side, and the first substrate 11 is supported by a stainless steel jig.
- a rod-shaped member 14 having a circular cross section with a diameter of 10 mm was inserted into the hole 11A.
- the second substrate 12 is pushed vertically downward at a speed of 10 mm/min by the bar member 14, and the stress when the second substrate 12 is peeled off from the first substrate 11 is The measurement was taken as the PUSH adhesive strength.
- a measurement sample 13 was prepared in the same procedure as above, and after placing the first substrate 11 on the upper side and the second substrate 12 on the lower side, the first substrate 11 was placed on a stainless steel jig. supported by tools. Also, a jig 16 (material: stainless steel) having a flat plate portion 16B (20 mm ⁇ 20 mm, thickness 5 mm) and a bar-shaped portion 16A (10 mm diameter, cylindrical shape) connected to the center of the flat plate portion 16B was prepared. As shown in FIG. 2, the rod-shaped portion 16A of the jig 16 was inserted into the hole 11A of the first substrate 11 and stood in the center of the second substrate 12. As shown in FIG.
- the first and second substrates were prepared in the same procedure as when preparing the measurement sample, and the adhesive composition was applied to the first substrate and photocured. After that, without using a gap material, the second substrate is superimposed on the first substrate via the adhesive composition so that the center positions of the first and second substrates are aligned. , a weight of 100 g was further placed on the second substrate for 10 seconds, the first and second substrates were pressed together via the adhesive composition, and the weight was removed. The thickness of the adhesive composition after removing the weight was measured. An adhesive composition having a thickness of less than 0.15 mm was evaluated as "B", and an adhesive composition having a thickness of 0.15 mm or more was evaluated as "A".
- Moisture-curable resins used in Examples and Comparative Examples were prepared according to the following Synthesis Examples.
- ⁇ Moisture-curable resin (A)>> [Synthesis Example 1] 100 parts by mass of polytetramethylene ether glycol (manufactured by Mitsubishi Chemical Corporation, trade name "PTMG-2000") as a polyol compound and 0.01 parts by mass of dibutyltin dilaurate were placed in a 500 mL separable flask and placed under vacuum. (20 mmHg or less) and mixed by stirring at 100° C. for 30 minutes.
- the pressure is adjusted to normal pressure, and 26.5 parts by mass of diphenylmethane diisocyanate (manufactured by Nisso Shoji Co., Ltd., trade name “Pure MDI”) is added as a polyisocyanate compound and stirred at 80° C. for 3 hours to react to have a polyether skeleton. , to obtain a moisture-curable urethane resin (ether skeleton aromatic-terminated urethane) having aromatic isocyanate groups at both ends.
- the obtained moisture-curable urethane resin had a weight average molecular weight of 2,700.
- the pressure is adjusted to normal pressure, 50 parts by mass of diphenylmethane diisocyanate (manufactured by Tosoh Corporation, trade name "Millionate MT”) is added as a polyisocyanate compound, and the mixture is stirred at 80 ° C. for 3 hours to react.
- a moisture-curable urethane resin (2-1) having an isocyanate group at the end was obtained.
- the obtained moisture-curable urethane resin (2-1) had a weight average molecular weight of 6,000.
- the moisture-curable urethane resin (3-1) also contained a moisture-curable urethane resin having isocyanate groups at both ends.
- the obtained moisture-curable urethane resin (3-1) had a weight average molecular weight of 5,000.
- Components other than the moisture-curable urethane resin used in each example and comparative example were as follows.
- Examples 1 to 9, Comparative Examples 1 to 8 According to the compounding ratios shown in Tables 1 and 2, each material was stirred at a temperature of 50 ° C. with a planetary stirrer (manufactured by Thinky Co., Ltd., "Awatori Mixer"), and then at a temperature of 50 with three ceramic rolls. °C to obtain adhesive compositions of Examples 1 to 9 and Comparative Examples 1 to 8.
- a planetary stirrer manufactured by Thinky Co., Ltd., "Awatori Mixer
- the adhesive composition in each example contained a nitrogen atom-containing silane coupling agent, or a comparative example containing a nitrogen atom-free silane coupling agent, or a silane Even when the adherend was a metal substrate, both the adhesive strength and the impact resistance could be improved as compared with the comparative example containing no coupling agent.
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Abstract
Description
また、特許文献2には、ラジカル重合性化合物と、湿気硬化型樹脂と、光ラジカル重合開始剤と、カップリング剤とを含有して、耐湿熱性に優れる光湿気硬化型樹脂組成物を得ることが示されている。
しかしながら、従来の湿気硬化型接着剤では、例えば金属材料を被着体とした場合、十分な耐衝撃性を発現することができない。そのため、例えば、携帯電子機器を落下させた場合、落下時の衝撃で金属材料が他の被着体から剥離し、携帯電子機器の破損原因となるなどの問題がある。
そこで、本発明は、金属を被着体とする場合であっても、十分な耐衝撃性を有する湿気硬化型接着剤を提供することを課題とする。
本発明は、以下の[1]~[19]を提供するものである。
[2]前記シランカップリング剤が、トリアゾール骨格及びトリアジン骨格のうち少なくともいずれかを有する、[1]に記載の接着剤組成物。
[3]前記シランカップリング剤の含有量が、接着性組成物100質量部に対し、0.1質量部以上5質量部以下である、[1]又は[2]に記載の接着剤組成物。
[4]前記湿気硬化性樹脂が、ポリエーテル骨格を有する湿気硬化性樹脂、ポリカーボネート骨格を有する湿気硬化性樹脂、及びポリエステル骨格を有する湿気硬化性樹脂からなる群から選択される少なくとも1種を含む、[1]~[3]のいずれかに記載の接着剤組成物。
[5]前記湿気硬化性樹脂が、分子内にイソシアネート基を有するイソシアネート基含有樹脂を含む、[1]~[4]のいずれかに記載の接着剤組成物。
[6]前記湿気硬化性樹脂が、分子内にイソシアネート基と、(メタ)アクリロイル基を有するイソシアネート基含有樹脂を含む、[5]に記載の接着剤組成物。
[7]前記接着剤組成物が、さらにラジカル重合性化合物と、光重合開始剤とを含む、[1]~[6]のいずれかに記載の接着剤組成物。
[8]前記ラジカル重合性化合物が、脂肪族ウレタン(メタ)アクリレートを含む、[7]に記載の接着剤組成物。
[9]前記ラジカル重合性化合物の含有量が、接着性組成物100質量部に対し、4質量部以上59質量部以下である、[7]又は[8]に記載の接着剤組成物。
[10]前記接着性組成物における、湿気硬化性樹脂に対するラジカル重合性化合物の含有量比が、1/10以上15/10以下である、[7]~[9]のいずれかに記載の接着剤組成物。
[11]前記光重合開始剤が、ベンゾフェノン系化合物、アセトフェノン系化合物、アシルフォスフィンオキサイド系化合物、チタノセン系化合物、オキシムエステル系化合物、ベンゾインエーテル系化合物、及びチオキサントンから選択される少なくとも1種である、[7]~[10]のいずれかに記載の接着剤組成物。
[12]前記光重合開始剤の含有量が、接着性組成物100質量部に対し、0.01質量部以上8質量部以下である、[7]~[11]のいずれかに記載の接着剤組成物。
[13]前記接着剤組成物が、さらに、湿気硬化促進触媒を含む、[1]~[12]のいずれかに記載の接着剤組成物。
[14]前記湿気硬化性樹脂の重量平均分子量が、1000以上50000以下である、[1]~[13]のいずれかに記載の接着剤組成物。
[15]前記湿気硬化性樹脂の含有量が、接着性組成物100質量部に対し、40質量部以上95質量部以下である、[1]~[14]のいずれかに記載の接着剤組成物。
[16]光硬化性を有する、[1]~[15]のいずれかに記載の接着剤組成物。
[17][1]~[16]のいずれかに記載の接着剤組成物の硬化体。
[18][1]~[16]のいずれかに記載の接着剤組成物からなる、電子部品用接着剤。
[19][1]~[16]のいずれかに記載の接着剤組成物からなる、携帯電子機器用接着剤。
本発明の接着性組成物は、湿気硬化性樹脂と、シランカップリング剤とを含む。以下、詳細に説明する。
シランカップリング剤は、含窒素複素環を有する。シランカップリング剤が、含窒素複素環を有することにより、接着剤組成物の被着体が金属である場合でも、接着性組成物の耐衝撃性を十分に発現することができる。その原理は定かではないが、被着体の金属原子が窒素原子に配位結合し、接着剤組成物が被着体から剥がれしにくくなるためと考えられる。
シランカップリング剤において一分子中における窒素原子数は、特に限定されず、1以上であればよいが、2以上であることが好ましい。窒素原子数の上限に関しては、10以下であることが好ましく、8以下であることがより好ましい。また、含窒素複素環における窒素原子の位置も、特に限定されない。
含窒素複素環を有するシランカップリング剤は、接着性組成物の上記耐衝撃性をより向上させる観点から、含窒素芳香族複素環を有することが好ましく、トリアゾール骨格、トリアジン骨格の少なくともいずれかを有することがより好ましく、ベンゾトリアゾール骨格、トリアジン骨格の少なくともいずれかを有することがさらに好ましい。
シランカップリング剤は、上記含窒素複素環に加えて、反応性シリル基を有するとよい。反応性シリル基は、ケイ素原子に結合する、アルコキシ基及び水酸基の少なくともいずれかを有することが好ましく、より好ましくはケイ素原子に結合するアルコキシ基を有する。
トリアゾール骨格を有するシランカップリング剤は、例えば下記一般式(1)に示される、ベンゾトリアゾール骨格と反応性シリル基を有する有機ケイ素化合物であることが好ましい。
R5は、上記の中では、二価の飽和炭化水素基であることがより好ましく、アルキレン基がさらに好ましい。R5の炭素原子数は1~15であることが好ましい。
アルキレン基の具体例としては、メチレン基、エチレン基、n-プロピレン基、ブチレン基、へキシレン基、へプチレン基、オクチレン基、ドデシレン基等が挙げられる。
R6、R7におけるアルキル基の具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、sec-ブチル基、ペンチル基、ネオペンチル基、イソペンチル基、sec-ペンチル基、ヘキシル基、へプチル基、オクチル基等が挙げられる。R1~R4におけるアルキル基の具体例としては、これらの中でも炭素数原子数1~6のものが挙げられる。
トリアジン骨格を有するシランカップリング剤は、例えば、下記一般式(2)に示される、トリアジン骨格と反応性シリル基を有する化合物であることが好ましい。
R8は、上記の中では、二価の飽和炭化水素基であることがより好ましく、アルキレン基がさらに好ましい。R8の炭素原子数は1~15であることが好ましい。
アルキレン基の具体例としては、メチレン基、エチレン基、n-プロピレン基、ブチレン基、へキシレン基、へプチレン基、オクチレン基、ドデシレン基等が挙げられる。
R11,R12は上記の中では、水素原子が好ましい。
R9、R10におけるアルキル基の具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、sec-ブチル基、ペンチル基、ネオペンチル基、イソペンチル基、sec-ペンチル基、ヘキシル基、へプチル基、オクチル基等が挙げられる。R11,R12におけるアルキル基の具体例は、R9、R10で示したものと同様のものが挙げられる。
以上のシランカップリング剤は、いずれか1種を単独で使用してもよいし、2種以上を併用して使用してもよい。
本発明の接着性組成物に含有される湿気硬化性樹脂としては、分子内にイソシアネート基を含有するイソシアネート基含有樹脂、分子内に加水分解性シリル基を含有する加水分解性シリル基含有樹脂などが挙げられる。イソシアネート基含有樹脂は、分子内のイソシアネート基が、空気中又は被着体などに存在する水と反応して硬化する。また、加水分解性シリル基含有樹脂は、分子内の加水分解性シリル基が、空気中又は被着体などに存在する水と反応して硬化する。湿気硬化性樹脂は、上記した中では、イソシアネート基含有樹脂が好ましい。
湿気硬化性樹脂は、1種単独で使用してもよいし、2種以上を併用してもよい。
なお、芳香族イソシアネート基は、芳香族環に直接結合したイソシアネート基であり、脂肪族イソシアネート基は、イソシアネート基が脂肪族の炭素原子に直接結合したイソシアネート基である。
芳香族イソシアネート基は、芳香族イソシアネート化合物由来のイソシアネート基であり、芳香族イソシアネート化合物の詳細は後述するとおりである。脂肪族イソシアネート基は、脂肪族イソシアネート化合物由来のイソシアネート基であり、脂肪族イソシアネート化合物の詳細は後述するとおりである。
イソシアネート基含有樹脂は、少なくとも一部が(メタ)アクリロイル基を有すればよい。したがって、イソシアネート基含有樹脂は、(メタ)アクリロイル基を有するイソシアネート基含有樹脂と、(メタ)アクリロイル基を有しないイソシアネート基含有樹脂を併用してもよい。このように樹脂を併用すると、接着性組成物の耐衝撃性、接着力を向上させやすくなる。
なお、本明細書において、「(メタ)アクリロイル基」は、アクリロイル基又はメタクリロイル基を意味し、他の類似する用語も同様である。
なお、イソシアネート基含有樹脂は、(メタ)アクリロイル基を有する場合、接着性組成物の耐衝撃性、接着力を向上させやすくする観点から、片末端にイソシアネート基を有し、片末端に(メタ)アクリロイル基を有することが好ましい。
これらの湿気硬化性樹脂は、いずれか1種を単独で含有されてもよいし、2種を併用して含有されていてもよい。中でも、接着性組成物の耐衝撃性、接着力の向上の観点から、ポリカーボネート骨格を有する湿気硬化性樹脂、又はポリエステル骨格を有する湿気硬化性樹脂が含有されることがより好ましく、ポリカーボネート骨格を有する湿気硬化性樹脂が含有されることがさらに好ましい。
湿気硬化性樹脂は、湿気硬化性ウレタン樹脂であることが好ましい。したがって、湿気硬化性樹脂は、イソシアネート基に加えて、ウレタン結合を有することが好ましい。湿気硬化性樹脂として湿気硬化性ウレタン樹脂を使用することで、耐衝撃性などが向上しやすい。また、湿気硬化性ウレタン樹脂は、イソシアネート基及びウレタン結合に加えてさらに(メタ)アクリロイル基を有してもよい。(メタ)アクリロイル基を有する湿気硬化性ウレタン樹脂を使用することで、耐衝撃性及び接着性をさらに向上しやすくなる。また、湿気硬化性ウレタン樹脂は、(メタ)アクリロイル基を有する湿気硬化性ウレタン樹脂と、(メタ)アクリロイル基を有しない湿気硬化性ウレタン樹脂を併用することも好ましい。
以下、湿気硬化性樹脂が湿気硬化性ウレタン樹脂である場合についてより詳細に説明する。
湿気硬化性ウレタン樹脂は、(メタ)アクリロイル基を有する場合には、ポリオール化合物と、ポリイソシアネート化合物に加えて、(メタ)アクリロイル基を有する化合物を反応させて得られたものであることが好ましい。具体的には、ポリオール化合物とポリイソシアネート化合物を反応して得た反応生成物を、さらにイソシアネート基又は水酸基及び(メタ)アクリロイル基を有する化合物に反応させて得てもよい。また、ポリオール化合物と、イソシアネート基及び(メタ)アクリロイル基を有する化合物とを反応して得た反応生成物を、ポリイソシアネート化合物に反応させて得てもよい。また、ポリイソシアネート化合物と、水酸基及び(メタ)アクリロイル基を有する化合物とを反応して得た反応生成物を、ポリオール化合物に反応させて得てもよい。さらに、湿気硬化性ウレタン樹脂は、ポリオール化合物、ポリイソシアネート化合物、及びイソシアネート基又は水酸基と(メタ)アクリロイル基を有する化合物を同時並行で反応させて得てもよい。
さらに、(メタ)アクリロイル基を有する湿気硬化性ウレタン樹脂の合成においては、(メタ)アクリロイル基を有しない湿気硬化性ウレタン樹脂を合わせて合成してもよい。
また、湿気硬化性ウレタン樹脂の原料となるポリオール化合物に、ポリエステルポリオールを使用することで、湿気硬化性ウレタン樹脂にポリエステル骨格を導入させ、ポリエステル骨格を有する湿気硬化性ウレタン樹脂とすればよい。
ポリカーボネート骨格を有する湿気硬化性ウレタン樹脂を得る場合は、湿気硬化性ウレタン樹脂の原料となるポリオール化合物に、ポリカーボネートポリオールを使用することで、湿気硬化性ウレタン樹脂にポリカーボネート骨格を導入させればよい。
ここで、ビスフェノール型のポリオキシアルキレン変性体は、ビスフェノール型分子骨格の活性水素部分にアルキレンオキシド(例えば、エチレンオキシド、プロピレンオキシド、ブチレンオキシド、イソブチレンオキシド等)を付加反応させて得られるポリエーテルポリオールである。該ポリエーテルポリオールは、ランダム共重合体であってもよいし、ブロック共重合体であってもよい。上記ビスフェノール型のポリオキシアルキレン変性体は、ビスフェノール型分子骨格の両末端に、1種又は2種以上のアルキレンオキシドが付加されていることが好ましい。
ビスフェノール型としては特に限定されず、A型、F型、S型等が挙げられ、好ましくはビスフェノールA型である。
また、ポリイソシアネート化合物としては、上述したポリイソシアネート化合物を用いることができる。
なかでも、プロピレングリコール、テトラヒドロフラン(THF)化合物の開環重合化合物、又は、メチル基等の置換基を有するテトラヒドロフラン化合物の開環重合化合物からなるポリエーテルポリオールを用いたものが好ましく、プロピレングリコールがより好ましい。
式(3)中、R13は、水素原子、メチル基、又は、エチル基を表し、lは、0~5の整数、mは、1~500の整数、nは、1~10の整数である。lは、0~4であることが好ましく、mは、50~200であることが好ましく、nは、1~5であることが好ましい。なお、lが0の場合とは、R13と結合した炭素が直接酸素と結合している場合を意味する。
上記した中では、nとlの合計が1以上であることがより好ましく、1~3がさらに好ましい。また、R13は水素原子、メチル基であることがより好ましく、メチル基が特に好ましい。
nは5~200であることが好ましく、10~150であることがより好ましく、20~50であることがさらに好ましい。
また、湿気硬化性ウレタン樹脂を構成するポリカーボネートポリオールに含まれるRは、1種単独で使用してよいし、2種以上を併用してもよい。2種以上併用する場合には、少なくとも一部が炭素数6以上の鎖状の脂肪族飽和炭化水素基であることが好ましい。また、好ましくは一分子中に2種類以上のRを含み、より好ましくは一分子中に2種又は3種のRを含む。
炭素数6以上の鎖状の脂肪族飽和炭化水素基は、好ましくは炭素数6以上12以下であり、さらに好ましくは炭素数6以上10以下、よりさらに好ましくは炭素数6以上8以下である。
Rの具体例としては、テトラメチレン基、ペンチレン基、ヘキサメチレン基、ヘプタメチレン基、オクタメチレン基、ノナメチレン基、デカメチレン基などの直鎖状であってもよいし、例えば3-メチルペンチレン基などのメチルペンチレン基、メチルオクタメチレン基などの分岐状であってもよい。一分子中における複数のRは、互いに同一であってもよいし、異なっていてもよい。さらに、弾性率を一定値以上とする観点からRは分岐状の脂肪族飽和炭化水素基を含むことが好ましく、耐候性の観点からはRは直鎖状の脂肪族飽和炭化水素基を含むことが好ましい。ポリカーボネートポリオールにおけるRは分岐状と直鎖状のRが併用されていてもよい。
なお、ポリカーボネートポリオールは、1種単独で用いてもよいし、2種以上を組み合わせて用いてもよい。
ポリエステルポリオールの原料となるポリオールとしては、例えば、エチレングリコール、プロピレングリコール、1,3-プロパンジオール、1,4-ブタンジオール、ネオペンチルグリコール、1,5-ペンタンジオール、1,6-ヘキサンジオール、ジエチレングリコール、シクロヘキサンジオール等が挙げられる。
芳香族ポリイソシアネート化合物としては、例えば、ジフェニルメタンジイソシアネート、ジフェニルメタンジイソシアネートの液状変性物、トリレンジイソシアネート、ナフタレン-1,5-ジイソシアネート等が挙げられる。芳香族ポリイソシアネート化合物は、これらを多量化したものでもあってもよく、ポリメリックMDIなどでもよい。芳香族ポリイソシアネート化合物としては、ジフェニルメタンジイソシアネートが好ましい。
脂肪族ポリイソシアネート化合物としては、例えば、ヘキサメチレンジイソシアネート、トリメチルヘキサメチレンジイソシアネート、リジンジイソシアネート、ノルボルナンジイソシアネート、トランスシクロヘキサン-1,4-ジイソシアネート、イソホロンジイソシアネート、水添キシリレンジイソシアネート、水添ジフェニルメタンジイソシアネート、シクロヘキサンジイソシアネート、ビス(イソシアネートメチル)シクロヘキサン、ジシクロヘキシルメタンジイソシアネート等が挙げられる。脂肪族ポリイソシアネート化合物は、これらを多量化したものなどであってもよい。
ポリイソシアネート化合物は、1種単独で用いられてもよいし、2種以上を組み合わせて用いられてもよい。
また、これら水酸基及び(メタ)アクロイル基を有する化合物は、各種ジイソシアネート化合物と、イソシアネート基/水酸基(モル比)が2となるような割合で反応させることにより得られる化合物等を、湿気硬化性ウレタン樹脂の原料となる(メタ)アクリロイル基を有する化合物として使用してもよい。
なお、本明細書において重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)で測定を行い、ポリスチレン換算により求められる値である。GPCによってポリスチレン換算による重量平均分子量を測定する際のカラムとしては、Shodex LF-804(昭和電工社製)が挙げられる。また、GPCで用いる溶媒としては、テトラヒドロフランが挙げられる。
本発明の光湿気硬化型樹脂組成物は、ラジカル重合性化合物を含有することが好ましい。光湿気硬化型樹脂組成物は、ラジカル重合性化合物を含有することで、接着性組成物に良好な形状保持性を付与することができ、実用性に優れた接着剤を作成することができる。
ラジカル重合性化合物としては、特に限定されないが、例えば各種脂肪族(メタ)アクリル化合物を使用することができ、好ましくは脂肪族ウレタン(メタ)アクリレート等が使用される。なお、脂肪族ウレタン(メタ)アクリレートは、残存イソシアネート基を有さないものである。他のラジカル重合性化合物は、単官能であってもよいし、2官能などの多官能であってもよい。
上記水酸基を有する(メタ)アクリル酸誘導体としては、例えば、エチレングリコール、プロピレングリコール、1,3-プロパンジオール、1,3-ブタンジオール、1,4-ブタンジオール、ポリエチレングリコール等の二価のアルコールのモノ(メタ)アクリレートや、トリメチロールエタン、トリメチロールプロパン、グリセリン等の三価のアルコールのモノ(メタ)アクリレート等が挙げられる。
単官能の脂肪族ウレタン(メタ)アクリレートは、より具体的には、上記したモノイソシアネート化合物と、二価のアルコールのモノ(メタ)アクリレートとを反応して得られたウレタン(メタ)アクリレートが好ましく、その好適な具体例としては、1,2-エタンジオール1-アクリラート2-(N-ブチルカルバマート)などの1,2-エタンジオール1-アクリラート2-(N-アルキルカルバマート)が挙げられる。
また、ラジカル重合性化合物の含有量は、接着性組成物100質量部に対して、59質量部以下が好ましく、50質量部以下がより好ましく、45質量部以下がさらに好ましい。ラジカル重合性化合物の含有量をこれら上限値以下とすることで、接着性組成物における湿気硬化性樹脂を一定量以上にでき、接着力及び耐衝撃性に優れた接着性組成物を得やすくなる。
本発明の接着剤組成物は、さらに光重合開始剤を含有してもよい。接着剤組成物は、光重合開始剤を含有することで、接着剤組成物に光硬化性などを適切に付与できる。接着剤組成物は、ラジカル重合性化合物を含有する場合に、光重合開始剤を使用することが好ましい。
光重合開始剤としては、例えば、ベンゾフェノン系化合物、アセトフェノン系化合物、アシルフォスフィンオキサイド系化合物、チタノセン系化合物、オキシムエステル系化合物、ベンゾインエーテル系化合物、チオキサントン等が挙げられる。
上記光重合開始剤のうち市販されているものとしては、例えば、IRGACURE184、IRGACURE369、IRGACURE379、IRGACURE651、IRGACURE784、IRGACURE819、IRGACURE907、IRGACURE2959、IRGACURE OXE01、ルシリンTPO(いずれもBASF社製)、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル(いずれも東京化成工業社製)等が挙げられる。
本発明の接着剤組成物は、湿気硬化性樹脂の湿気硬化反応を促進させる湿気硬化促進触媒を含有させてもよい。湿気硬化促進触媒を使用することにより、接着剤組成物は、湿気硬化性がより優れたものとなり、接着力を高めやすくなる。
湿気硬化促進触媒としては、具体的にはアミン系化合物、金属系触媒などが挙げられる。アミン系化合物としては、ジ(メチルモルホリノ)ジエチルエーテル、4-モルホリノプロピルモルホリン、2,2’-ジモルホリノジエチルエーテル等のモルホリン骨格を有する化合物、ビス(2-ジメチルアミノエチル)エーテル、1,2-ビス(ジメチルアミノ)エタンなどのジメチルアミノ基を2つ有するジメチルアミノ基含有アミン化合物、トリエチルアミン、1,4-ジアザビシクロ[2.2.2]オクタン、2,6,7-トリメチル-1,4-ジアザビシクロ[2.2.2]オクタン等が挙げられる。
金属系触媒としては、ジラウリル酸ジn-ブチルスズ、ジ酢酸ジn-ブチルスズ、オクチル酸スズ等のスズ化合物、オクチル酸亜鉛、ナフテン酸亜鉛等の亜鉛化合物、ジルコニウムテトラアセチルアセトナート、ナフテン酸銅、ナフテン酸コバルト等のその他の金属化合物が挙げられる。
接着剤組成物における湿気硬化促進触媒の含有量は、接着剤組成物100質量部に対して、好ましくは0.1質量部以上10質量部以下、より好ましくは0.2質量部以上8質量部以下、さらに好ましくは0.3質量部以上5質量部以下である。
本発明の接着剤組成物は、充填剤を含有してもよい。充填剤を含有することにより、本発明の接着剤組成物は、好適なチクソ性を有するものとなり、塗布後の形状保持性を良好にしやすくなる。充填剤としては、粒子状のものを使用すればよい。
充填剤としては、無機充填剤が好ましく、例えば、シリカ、タルク、酸化チタン、酸化亜鉛、炭酸カルシウム等が挙げられる。なかでも、接着剤組成物が紫外線透過性に優れるものとなることから、シリカが好ましい。また、充填剤は、シリル化処理、アルキル化処理、エポキシ化処理等の疎水性表面処理がなされていてもよい。
充填剤は、1種単独で用いられてもよいし、2種以上が組み合わせて用いられてもよい。
充填剤の含有量は、接着剤組成物100質量部に対して、好ましくは0.5質量部以上30質量部以下、より好ましくは1質量部以上25質量部以下、さらに好ましくは2質量部以上15質量部以下である。
接着剤組成物は、必要に応じて、溶剤により希釈されていてもよい。接着剤組成物が溶剤により希釈される場合、接着剤組成物の各量(質量部、質量%)は、固形分基準であり、すなわち、溶剤を除いた質量部、質量%を意味する。
本発明の接着剤組成物は、硬化され、硬化体として使用されるとよい。本発明の接着剤組成物は、少なくとも湿気硬化性を有する。したがって、接着剤組成物は、例えば、一対の被着体間に接着剤組成物又は半硬化された接着剤組成物を配置して、少なくとも湿気により硬化された接着剤組成物(硬化体)により、一対の被着体を接着させるとよい。
ここで、接着剤組成物は、被着体間に配置させ、その被着体間を接合させる場合には、一方の被着体に塗布し、その後、光照射により光硬化させ、例えばBステージ状態にし、その光硬化した接着剤組成物の上に他方の被着体を重ね合わせ、被着体間を適度な接着力で仮接着させるとよい。その後、Bステージ状態の接着剤組成物は、湿気硬化性樹脂を湿気により硬化させることで全硬化させ、接着剤組成物を介して重ね合わされた被着体間が十分な接着力で接合される。
接着剤組成物が使用される被着体は、特に限定されないが、好ましくは、携帯電子機器を構成する部品であり、その部品は電子部品であることが好ましい。被着体の材質としては、金属、ガラス、プラスチック等のいずれでもよいが、被着体の少なくともいずれが金属であることが好ましい。また、被着体の形状としては、特に限定されず、例えば、フィルム状、シート状、板状、パネル状、トレイ状、ロッド(棒状体)状、箱体状、筐体状等が挙げられる。
携帯電子機器としては、特に限定されないが、スマートフォンなどの携帯電話、デジタルカメラ、ウェラブル端末、携帯ゲーム機器、タブレット型コンピューター、ノート型コンピューター、アクションカメラなどが挙げられ、これらの中ではスマートフォン、ウェラブル端末が好ましい。本発明の接着剤組成物は、耐衝撃性が良好であるので、携帯電子機器に特に好適である。
例えば、本発明の接着剤組成物は、電子機器内部などにおいて、例えば基板と基板とを接合して組立部品を得るために使用されてもよい。このようにして得られた組立部品は、第1の基板と、第2の基板と、本発明の硬化体を有し、第1の基板の少なくとも一部が、第2の基板の少なくとも一部に硬化体を介して接合される。
(PUSH接着力)
図1(a)に示すように、90mm×50mmで厚み5mmであり、中央に直径12mmの円形の孔11Aを有する第1の基板11、及び50mm×50mmで厚み5mmの第2の基板12を用意した。第1の基板11はアルミニウム(AL)製、第2の基板12はポリカーボネート(PC)製であった。
第1の基板11の孔11Aを中心に囲むように、ディスペンサーを用いて、幅1mm±0.2mm、高さ0.25mm±0.05mmで20mm×20mmの四角枠状に接着剤組成物10を塗布した。塗布完了後1分以内に、UV-LED(波長365nm)を用いて、紫外線を1000mJ/cm2照射することによって、接着剤組成物10を光硬化させた。その後、高さ0.2mmのギャップ材(図示しない)及び接着剤組成物10を介して、第1及び第2の基板11,12同士の中心位置が一致するようにして、第1の基板11の上に第2の基板12を重ね合わせ、第2の基板12の上にさらに2kgのおもりを10秒間静置させることで、第1及び第2の基板11,12を、接着剤組成物10を介して圧着させた。その後、2kgのおもりを取り除き、25℃、50%RHで24時間放置することにより、接着剤組成物10を湿気硬化させ、測定用サンプル13を得た。湿気硬化後、ギャップ材は測定用サンプル13から取り除いた。
得られた測定用サンプル13において、第1の基板11を上側、第2の基板12を下側になるように配置して、第1の基板11をステンレス製治具で支持した状態で、直径が10mmの断面円形状である棒状部材14を、孔11Aに挿入した。そして、図1(b)に示すように、棒状部材14により10mm/分の速度で第2の基板12を鉛直下向きに押して、第2の基板12が第1の基板11から剥がれる際の応力を測定してPUSH接着力とした。
図2に示すとおり、上記と同様の手順で測定用サンプル13を用意し、第1の基板11を上側、第2の基板12を下側に配置したうえで第1の基板11をステンレス製治具で支持した。
また、平板部16B(20mm×20mm、厚み5mm)と、平板部16Bの中心に接続された棒状部16A(直径10mm、円柱状)とを有する治具16(材質:ステンレス)を用意して、治具16の棒状部16Aを図2に示すとおり、第1の基板11の孔11Aに挿入して、第2の基板12の中央に立たせた。
その状態で、デュポン式落下衝撃試験機を用いて、平板部16Bに対する高さが200mmとなる位置から、平板部16Bの中央に鉛直下向きに300gのステンレス製のおもり15を繰り返し落下させ、おもり15の衝撃により、第2の基板12が剥がれ落ちるまでのおもりの落下回数を耐久回数とした。
測定用サンプルを用意するときと同様の手順で、第1及び第2の基板を用意し、第1の基板に接着剤組成物を塗布して光硬化させた。
その後、ギャップ材を使用せずに、接着剤組成物を介して、第1及び第2の基板同士の中心位置が一致するようにして、第1の基板の上に第2の基板を重ね合わせ、第2の基板の上にさらに100gのおもりを10秒間静置させ、第1及び第2の基板を、接着剤組成物を介して圧着させ、おもりを取り除いた。おもりを取り除いた後の接着剤組成物の厚みを測定した。接着剤組成物の厚みが0.15mm未満となったものを「B」、0.15mm以上となったものを「A」と評価した。
<<湿気硬化性樹脂(A)>>
[合成例1]
ポリオール化合物として100質量部のポリテトラメチレンエーテルグリコール(三菱化学社製、商品名「PTMG-2000」)と、0.01質量部のジブチル錫ジラウレートとを500mL容量のセパラブルフラスコに入れ、真空下(20mmHg以下)、100℃で30分間撹拌して混合した。その後常圧とし、ポリイソシアネート化合物としてジフェニルメタンジイソシアネート(日曹商事社製、商品名「Pure MDI」)26.5質量部を入れ、80℃で3時間撹拌して反応させ、ポリエーテル骨格を有し、両末端が芳香族イソシアネート基である湿気硬化性ウレタン樹脂(エーテル骨格芳香族末端ウレタン)を得た。得られた湿気硬化性ウレタン樹脂の重量平均分子量は2700であった。
[合成例2]
ポリオール化合物として100質量部のポリカーボネートジオール(式(3)で表される化合物、Rの90モル%が3-メチルペンチレン基、10モル%がヘキサメチレン基、クラレ社製、商品名「Kuraraypolyol C-1090」)と、0.01質量部のジブチル錫ジラウレートとを500mL容量のセパラブルフラスコに入れた。フラスコ内を真空下(20mmHg以下)、100℃で30分間撹拌して混合した。その後常圧とし、ポリイソシアネート化合物としてジフェニルメタンジイソシアネート(東ソー社製、商品名「ミリオネートMT」)50質量部を入れ、80℃で3時間撹拌して反応させ、ポリカーボネート(PC)骨格を有し、両末端がイソシアネート基である、湿気硬化性ウレタン樹脂(2-1)を得た。得られた湿気硬化性ウレタン樹脂(2-1)の重量平均分子量は6000であった。
[合成例3]
ポリオール化合物として100質量部のポリカーボネートジオール(式(3)で表される化合物、Rの90モル%が3-メチルペンチレン基、10モル%がヘキサメチレン基、クラレ社製、商品名「Kuraraypolyol C-1090」)と、0.01質量部のジブチル錫ジラウレートとを500mL容量のセパラブルフラスコに入れた。フラスコ内を真空下(20mmHg以下)、80℃で60分間撹拌して混合した。その後常圧として、得られた反応生成物に対して、2-メタクリロイルオキシエチルイソシアナート(昭和電工社製、商品名「カレンズMOI」)30質量部を加え、100℃で3時間撹拌して反応させ、ポリカーボネート(PC)骨格を有し、片末端がメタクリロイル基である、反応生成物を得た。
得られた反応生成物に対して、ポリイソシアネート化合物としてジフェニルメタンジイソシアネート(東ソー社製、商品名「ミリオネートMT」)50質量部を入れ、80℃で3時間撹拌して反応させ、ポリカーボネート(PC)骨格を有する湿気硬化性ウレタン樹脂(3-1)を得た。湿気硬化性ウレタン樹脂(3-1)中、片末端はメタクリロイル基であり、片末端がイソシアネート基である湿気硬化性ウレタン樹脂(A1)の割合は80質量%であった。また、湿気硬化性ウレタン樹脂(3-1)は、両末端がイソシアネート基である湿気硬化性ウレタン樹脂も含有していた。得られた湿気硬化性ウレタン樹脂(3-1)の重量平均分子量は5000であった。
(ラジカル重合性化合物)
・ウレタンアクリレート:ダイセル・オルネクス社製、商品名「EBECRYL8411」
・ラウリルアクリレート:共栄社化学社製、商品名「ライトアクリレート」、単官能
・含窒素シランカップリング剤1:上記一般式(1)において、R1~R4が水素原子、a=3、n=1、R7がメチル基である、トリアゾール骨格を有するシランカップリング剤、信越化学工業社製、商品名「X-12-1214A」
・含窒素シランカップリング剤2:上記一般式(2)において、R11及びR12が水素原子、a=3、n=1、R10がエチル基である、トリアジン骨格を有するシランカップリング剤、四国化成工業社製、商品名「VD-5」
・イソシアネート基含有シランカップリング剤:信越化学工業社製、商品名「KBE-9007」
・トリメチルシリル化処理シリカ、日本アエロジル社製、商品名「R812」、一次粒子径7nm
・2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタノン-1、BASF社製、商品名「IRGACURE 369」
・ラジカル捕捉剤
・酸化防止剤
・湿気硬化触媒
表1及び2に記載された配合比に従い、各材料を、遊星式撹拌装置(シンキー社製、「あわとり練太郎」)にて温度50℃で撹拌した後、セラミック3本ロールにて温度50℃で均一に混合して実施例1~9、比較例1~8の接着剤組成物を得た。
Claims (9)
- 湿気硬化性樹脂と、含窒素複素環を有するシランカップリング剤とを含む接着剤組成物。
- 前記シランカップリング剤が、トリアゾール骨格及びトリアジン骨格のうち少なくともいずれかを有する、請求項1に記載の接着剤組成物。
- 前記シランカップリング剤の含有量が、接着性組成物100質量部に対し、0.1質量部以上5質量部以下である、請求項1又は2に記載の接着剤組成物。
- 前記湿気硬化性樹脂が、ポリエーテル骨格を有する湿気硬化性樹脂、ポリカーボネート骨格を有する湿気硬化性樹脂、及びポリエステル骨格を有する湿気硬化性樹脂からなる群から選択される少なくとも1種を含む、請求項1~3のいずれかに記載の接着剤組成物。
- 前記湿気硬化性樹脂が、分子内にイソシアネート基を有するイソシアネート基含有樹脂を含む、請求項1~4のいずれかに記載の接着剤組成物。
- 前記湿気硬化性樹脂が、分子内にイソシアネート基と、(メタ)アクリロイル基を有するイソシアネート基含有樹脂を含む、請求項5に記載の接着剤組成物。
- 前記接着剤組成物が、さらにラジカル重合性化合物と、光重合開始剤とを含む、請求項1~6のいずれかに記載の接着剤組成物。
- 請求項1~7のいずれかに記載の接着剤組成物からなる、電子部品用接着剤。
- 請求項1~7のいずれかに記載の接着剤組成物からなる、携帯電子機器用接着剤。
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