WO2013168712A1 - 光応答性接着剤 - Google Patents
光応答性接着剤 Download PDFInfo
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- WO2013168712A1 WO2013168712A1 PCT/JP2013/062853 JP2013062853W WO2013168712A1 WO 2013168712 A1 WO2013168712 A1 WO 2013168712A1 JP 2013062853 W JP2013062853 W JP 2013062853W WO 2013168712 A1 WO2013168712 A1 WO 2013168712A1
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- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/10—Removing layers, or parts of layers, mechanically or chemically
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- 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
- C09J201/06—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
- B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2405/00—Adhesive articles, e.g. adhesive tapes
Definitions
- the present invention relates to a photoresponsive adhesive, and more particularly, to a photoresponsive adhesive using a liquid crystal compound and capable of reversibly repeating adhesion and desorption with light.
- FIG. 1 is a diagram schematically showing the method, and in order from the left, shows (a) powder solid, (b) liquid, and (c) solid.
- A is ultraviolet light irradiation
- B is Represents visible light irradiation.
- This material is a single molecule with a molecular weight of thousands.
- FIG. 2 shows a state of an adhesive strength test using a material that is liquefied and solidified.
- the present invention has been made in view of the problems in such conventional photoresponsive adhesives, and provides an adhesive that has a stronger adhesive force and can be reversibly adhered and detached by light irradiation. It is the purpose.
- the present inventors have used a polymer liquid crystalline compound containing azobenzene or a sugar alcohol derivative containing a hydroxyl group and azobenzene as a main component, which makes it reversible by light irradiation.
- the inventors have found that a photoresponsive adhesive capable of strong adhesion and desorption of a substrate can be obtained, and the present invention has been completed.
- the present invention has been completed based on these findings, and according to the present invention, the following inventions are provided.
- the following general formula (1) (In the formula, m represents an integer of 0 to 20, and l represents an integer of 1 to 20.)
- the following general formula (2) (In Formula (2), R 1 represents a photoreactive side chain represented by Formula (1), and R 2 represents hydrogen or a methyl group.)
- a photoresponsive adhesive characterized by being a sugar alcohol derivative represented by the formula: [2] The photoresponsive adhesive according to [1], which can be detached by light irradiation and fluidization. [3] The photoresponsiveness according to [2], wherein the light irradiation is caused by ultraviolet light having a light wavelength of 300 to 400 nm, and an exposure amount is 0.1 to 200 J / cm 2 . adhesive. [4] The photoresponsive adhesive according to any one of [1] to [3], which can be bonded by irradiating light having a wavelength different from that used for fluidization to make it non-fluidized.
- [5] The photoresponsive adhesive according to [4], wherein the light irradiation is caused by light having a wavelength of 400 to 600 nm.
- [6] The photoresponsive adhesive according to any one of [1] to [5], which can be repeatedly attached and detached by irradiating light of different wavelengths and reversibly fluidizing / de-fluidizing.
- [7] A method for performing desorption / adhesion by reversible fluidization / non-fluidization by irradiating light of different wavelengths using the photoresponsive adhesive according to any one of [1] to [6] .
- [8] The method according to [7], wherein desorption by fluidization is performed by irradiating ultraviolet light having a wavelength of 300 to 400 nm.
- [9] The method according to [7], wherein adhesion by non-fluidization is performed by irradiating light having a wavelength of 400 to 600 nm.
- the adhesive strength at the time of adhesion of the photoresponsive adhesive that can be bonded and detached with light can be increased.
- the photoresponsive adhesive of the present invention is mainly composed of a liquid crystalline compound containing azobenzene, and the liquid crystalline compound is represented by the following general formula (2).
- R 1 represents a photoreactive side chain represented by the following general formula (1)
- R 2 represents hydrogen or a methyl group.
- R represents a hydrogen atom or a group represented by the following general formula (4), at least one of which is a hydrogen atom, and at least one of the following general formula (4) N represents an integer of 1 to 4.
- the polymer liquid crystalline compound containing azobenzene formed by polymerizing the monomer represented by the general formula (2) of the present invention is used for the rewritable recording medium described in Patent Document 3.
- the sugar alcohol derivative containing a hydroxyl group and azobenzene represented by the general formula (2) of the present invention is different from the sugar alcohol ester described in Patent Documents 1 and 2, At least one hydroxyl group of the sugar alcohol is not esterified but remains as a hydroxyl group.
- a polymer liquid crystalline compound having a photoisomerizable group or a sugar alcohol derivative having a photoisomerizable group and a hydroxyl group is in a non-flowable state at the time of adhesion. Softening due to light irradiation reduces adhesive strength. The strong adhesive force is restored by irradiating the softened adhesive with another light. At this time, the adhesive composed of these compounds, unlike conventional light control adhesives, exhibits a strong adhesive force at the time of bonding due to multipoint adsorption of polymers, formation of entangled structures of polymers or hydrogen bonding of hydroxyl groups. Conceivable.
- the polymer liquid crystalline compound having a photoisomerizable group of the present invention or a sugar alcohol derivative having a photoisomerizable group and a hydroxyl group is a solid under ordinary light at a temperature near room temperature, when used as an adhesive, It is melted by heating and sandwiched between adhesive layers, and then cooled and hardened for adhesion, or irradiated with ultraviolet light to liquefy and sandwiched between adhesive layers, and then irradiated with visible light to solidify and adhere.
- it may be processed into a sheet shape or a tape shape in advance and sandwiched between two adhesives, and then liquefied and solidified by the above method to be bonded.
- the adhesive may be dissolved in a solvent, applied to one side of the adhesive, dried, and then liquefied and solidified for adhesion.
- thermally liquefying it is necessary to heat each melting point, glass transition point or softening point or higher (at least 80 ° C.) depending on the chemical structure of the adhesive.
- the fluidity can be reversibly controlled by irradiation with light having different wavelengths, and a liquid crystal molecule having a polymer structure or a liquid crystal molecule having a hydroxyl group is present in the molecule. It has trans photoisomerizable side chains and is in a cis-trans photoisomerizable state even when it loses fluidity, and softens due to a large change in molecular structure after reaction from the state that lost fluidity Then, it transitions to a fluid state, and the reverse reaction occurs by changing the wavelength and irradiating again with light or simply leaving it, and the fluidity is lost again. This can be repeated.
- the principle of light liquefaction solidification is a change in molecular shape.
- the change in the state of the substance greatly depends on the shape of the molecule other than the temperature.
- trans fatty acids and cis fatty acids having the same chemical composition have a higher melting point.
- Azobenzene has long been known to undergo photoisomerization between trans and cis isomers in solution.
- this change in unsubstituted azobenzene is mainly composed of cis isomers during UV irradiation. It is known that the transformer body is the main component when irradiated with visible light.
- unsubstituted azobenzene does not exhibit a solid-to-liquid phototransition at room temperature. This is because the solid state of unsubstituted azobenzene is a crystal.
- FIG. 3 schematically shows the difference in molecular packing between a crystal and a liquid crystal phase, where (a) shows a crystalline substance (filled structure), and (b) shows a liquid crystal glass (free volume). Structure).
- the adhesive that can be reversibly bonded and detached with conventional light uses a liquid crystalline photoreactive substance.
- these liquid crystalline photoreactive substances are single compounds having a molecular weight of several thousand, the adhesion performance to the glass substrate is 50 N / cm 2 , which is one order of magnitude lower than that of a commercially available adhesive. I stayed.
- the causes include peeling of the adhesive surface and destruction of the bonded product itself (cohesive failure).
- the adhesive molecules are adsorbed to the adhesive surface in a multipoint manner while maintaining photoreactivity, thereby increasing the adhesive strength of the adhesive surface, and interface breakdown is less likely to occur.
- FIG. 4 schematically shows how the polymer is adsorbed at multiple points on the substrate. Further, as shown in FIG. 4, the molecules constituting the adhesive also interact with each other at many points and are strongly tied together, and are also strong against cohesive failure due to the formation of a chain entangled structure peculiar to a polymer chain. Therefore, by using a liquid crystalline polymer having a large molecular weight as an adhesive, it can be expected that strong adhesive strength can be achieved while maintaining photoresponsiveness.
- the photoresponsive group liquid crystalline polymer compound has a structure suitable as an adhesive that repeats adhesion and desorption with light, but when this is used as an adhesive, it is also suitable for its average molecular weight.
- the weight average molecular weight in terms of standard polystyrene is preferably from 1,000 to 100,000, more preferably from 5,000 to 50,000.
- Such a liquid crystal compound having a photoreactive group has been known for a long time, but until now it has not been known that it has the property of being liquefied and solidified by light. This is because a polymer liquid crystalline photoreactive material that is in a solid state at room temperature is not liquefied by light irradiation from a normal light source. That is, since the concentration of the azobenzene dye was too high, the light did not penetrate into the interior, and the phenomenon that the whole was liquefied was not captured.
- the reaction in the case of the reaction to be solidified, by using light of around 500 nm where the absorption of the cis isomer of azobenzene is weak, the reaction can be carried out by transmitting light to the inside, and can be quickly returned to the trans structure.
- the fluidity is lost when the photoisomerization group is a trans isomer, and the fluidity is imparted when it is a cis isomer.
- the reason why the liquefaction and solidification phenomenon of the photoresponsive liquid crystal compound has not been detected so far is as described above, but when this is used as a removable adhesive, it is not necessary to liquefy the entire material.
- the wavelength range of ultraviolet light is light having a wavelength of 300 to 400 nm, which is the main absorption region of the transformer body.
- the azobenzene derivative it is isomerized into a cis isomer with ultraviolet light near 360 to 380 nm, more preferably ultraviolet light near 365 nm, and 400 to 600 nm for adhesion.
- Transformers are arranged by irradiation with light, more preferably, visible light in the vicinity of 500 nm.
- the exposure amount varies depending on the type of light source and the thickness of the sample, but is 0.1 to 200 J / cm 2 . . Among these, 0.5 to 100 J / cm 2 is preferable.
- FIG. 5 schematically shows a network structure (pseudo polymer) by hydrogen bonding (dotted line). Therefore, such a compound having a hydroxyl group preferably has at least one hydroxyl group and a photoreactive group in the molecule. In addition to the hydroxyl group, an amino group, a carboxylic acid residue, and an amide group can be expected to have the same effect as the hydrogen bonding unit.
- Example 1 10- [4- ⁇ (4-hexyl) phenylazo ⁇ phenoxy] decyl acrylate was subjected to solution radical polymerization to obtain a polymer liquid crystalline compound (A) having a weight average molecular weight of 32,000 represented by the following chemical formula A.
- A polymer liquid crystalline compound having a weight average molecular weight of 32,000 represented by the following chemical formula A.
- the polymer of the same structure from which molecular weight differs is already reported (refer the said nonpatent literature 2).
- the polymer liquid crystal compound (A) was placed on a very small glass substrate and irradiated with ultraviolet light having a central wavelength of about 366 nm at room temperature (about 25 ° C.) using an LED light source (Nichia). When irradiated for 1 minute (12 J / cm 2 ), the powder changed into a syrupy viscous liquid. When the sample was observed between two orthogonal polarizers, it was found to be dark and isotropic viscous liquid.
- Example 2 About 1 mg of the polymer liquid crystalline compound (A) which was not irradiated with light was taken and sandwiched between the two glass substrates while being heated and spread to 12 mm ⁇ 4 mm. The glass substrate was adhere
- Example 3 When two glass substrates sandwiching the liquefied sample were irradiated with visible light with a central wavelength of 510 nm for 1 minute (1 J / cm 2 ) using an LED light source, the adhesive surface remained transparent, but the two substrates were Even if I tried to move it with my finger, it did not move. When the two glass substrates were pulled in opposite directions, they were not peeled off. When a tensile strength test was performed, the sample was peeled off when a force of 298 N / cm 2 was mechanically applied. The bond strength of the conventional sugar alcohol ester material (the above-mentioned Patent Document 2) was significantly higher than 50 N / cm 2 .
- Example 4 A small amount of a polymer liquid crystal compound (B) (weight average molecular weight 16500) represented by the following chemical formula B described in Patent Document 3 is heated and liquefied with a heat gun, and two glass plates (15 mm wide, 1 mm thick) The film was sandwiched between and thinned, and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed.
- B polymer liquid crystal compound represented by the following chemical formula B described in Patent Document 3
- Example 5 In this state, when the glass was irradiated with visible light (1 J / cm 2 ), even when a force was applied to squeeze it between fingers with the return of the adhesive force accompanying the solidification of the material, the glass stopped moving again. At this time, when it was pulled in the opposite direction until peeling, peeling occurred when a force of 280 N / cm 2 was applied.
- Example 6 A small amount of a polymer liquid crystal compound (C) (weight average molecular weight 18000) represented by the following chemical formula C described in Patent Document 3 is heated to 120 ° C. to be liquefied, and two glass plates (15 mm wide, 1 mm thick) The film was sandwiched between and thinned, and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed.
- C polymer liquid crystal compound represented by the following chemical formula C described in Patent Document 3
- Example 7 In this state, when an LED light source is used to irradiate visible light with a central wavelength of 510 nm (1 J / cm 2 ), the adhesive force is restored due to the solidification of the material. I stopped working. At this time, when it was pulled in the opposite direction until peeling, peeling occurred when a force of 193 N / cm 2 was applied.
- Example 8 A small amount of a polymer liquid crystal compound (D) (weight average molecular weight 9600) represented by the following chemical formula D described in Patent Document 3 is heated and liquefied with a heat gun, and two glass plates (15 mm wide, 1 mm thick) are used. The sandwich was thinned and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed. When an LED light source (Nichia) was used to irradiate ultraviolet rays having a central wavelength of 366 nm for 3 minutes at room temperature (36 J / cm 2 ), the material between the glasses was softened, and the resulting adhesive strength was reduced. The two sheets could be shifted with a force of 20 N / cm 2 .
- D polymer liquid crystal compound represented by the following chemical formula D described in Patent Document 3
- Example 9 In this state, when an LED light source is used to irradiate visible light with a central wavelength of 510 nm (1 J / cm 2 ), the adhesive force is restored due to the solidification of the material. I stopped working. At this time, when it was pulled in the opposite direction until peeling, peeling occurred when a force of 280 N / cm 2 was applied.
- Example 10 A small amount of a polymer liquid crystal compound (E) represented by the following chemical formula E (weight average molecular weight 8100) described in Patent Document 3 is heated to 120 ° C. to be liquefied, and two glass plates (15 mm wide, 1 mm thick) The film was sandwiched between and thinned, and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed.
- E polymer liquid crystal compound represented by the following chemical formula E (weight average molecular weight 8100) described in Patent Document 3 is heated to 120 ° C. to be liquefied, and two glass plates (15 mm wide, 1 mm thick) The film was sandwiched between and thinned, and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed.
- Example 11 In this state, when an LED light source is used to irradiate visible light with a central wavelength of 510 nm (1 J / cm 2 ), the adhesive force is restored due to the solidification of the material. I stopped working. At this time, when it was pulled in the opposite direction until peeling, peeling occurred when a force of 202 N / cm 2 was applied.
- R represents a hydrogen atom or a group represented by the following formula, at least one of which is a hydrogen atom, and at least one is a group represented by the following formula.
- Example 13 A small amount of the compound obtained in Example 12 was taken, heated with a heat gun to be liquefied, sandwiched between two glass plates (12 mm width, 1 mm thickness), thinned and cooled to room temperature. A force was applied to squeeze two pieces of glass with this material between the index finger and thumb, but they did not move at all, and a strong adhesive force was observed.
- an LED light source Naichia
- the material between the glasses was liquefied, and the resulting adhesive strength decreased, resulting in glass
- the two sheets could be easily shifted by putting them between fingers.
- Example 14 In this state, when an LED light source is used to irradiate visible light with a central wavelength of 510 nm (1 J / cm 2 ), the adhesive force is restored due to the solidification of the material. I stopped working. At this time, the film was pulled in the opposite direction until it was peeled, and peeled when a force of 210 N / cm 2 was applied.
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Abstract
Description
この材料は、分子量数千の単一分子である。用途としては光で可逆的に接着脱着が行える接着剤が考えられている。一般の接着剤では、熱や機械的な衝撃を与えず剥離することが難しく、また再接着やリサイクル利用も難しかった。光で可逆的に接着脱着を繰り返すことができる材料を用いることでこれらの問題が解決できるが、前記の糖アルコール骨格をもつ液晶性アゾベンゼン化合物は、接着時の接着力が小さいことが課題であった(ガラスの接着で50N/cm2)。図2に、光液化固化する材料を用いた接着強度試験の様子を示す。
[1]下記の一般式(1)
で表される光反応性側鎖を2つ以上もつ液晶性化合物を主成分とする光応答性接着剤であって、該液晶性化合物が、
下記一般式(2)
で表される単量体を重合して得られる重量平均分子量が1000~100000の高分子液晶性化合物、又は下記一般式(3)
で表される糖アルコール誘導体であることを特徴とする光応答性接着剤。
[2] 光を照射して流動化することにより脱着を行うことが可能な[1]に記載の光応答性接着剤。
[3] 前記の光照射が、光波長300~400nmの紫外光によるものであり、その露光量が0.1~200J/cm2であることを特徴とする[2]に記載の光応答性接着剤。
[4] 流動化に用いる光とは異なる波長の光を照射して非流動化することにより接着を行うことが可能な[1]~[3]のいずれかに記載の光応答性接着剤。
[5] 前記の光照射が、波長400~600nmの光によるものであることを特徴とする[4]に記載の光応答性接着剤。
[6] 異なる波長の光を照射して可逆的に流動化・非流動化させることにより繰り返しの接着脱着が可能な[1]~[5]のいずれかに記載の光応答性接着剤。
[7][1]~[6]のいずれかに記載の光応答性接着剤を用い、異なる波長の光を照射することにより、可逆的な流動化・非流動化による脱着・接着を行う方法。
[8]波長300~400nmの紫外光を照射することにより、流動化による脱着を行う[7]に記載の方法。
[9]波長400~600nmの光を照射することにより、非流動化による接着を行う[7]に記載の方法。
で表される、水酸基とアゾベンゼンを含む糖アルコール誘導体を用いることを特徴とするものであり、光照射によって可逆的に基材の強力な接着および脱着が可能なものである。
つまり、アゾベンゼン色素の濃度が高すぎるので光が内部まで浸透せず、全体が液化する現象を捉えられていなかった。
したがって、こういった水酸基を持つ化合物においては、分子中に少なくとも1つ以上の水酸基と光反応性基をもつことが好ましい。また水素結合性のユニットとしては、水酸基以外でも、アミノ基、カルボン酸残基、アミド基も同様の効果があると期待できる。
10-[4-{(4-ヘキシル)フェニルアゾ}フェノキシ]デシルアクレリートを溶液ラジカル重合して、下記の化学式Aで示される重量平均分子量32000の高分子液晶性化合物(A)を得た。なお、分子量が異なる同じ構造の高分子は既に報告されている(上記非特許文献2参照)。
光未照射の高分子液晶性化合物(A)を約1mgとり、加熱しながら、2枚のガラス基板に融解した状態で挟み込み面積12mm×4mmに広げた。これを冷却することで、ガラス基板が接着された。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温(約25℃)下で1分間照射(12J/cm2)し、液化したところ、ガラス2枚を指でずらすことができた。
液化したサンプルを挟んだ上記ガラス基板2枚にLED光源を用いて中心波長510nmの可視光を1分間照射(1J/cm2)したところ、接着面は透明なままだったが、基板2枚を指でずらそうとしてもずれなかった。このガラス基板2枚をそれぞれ逆方向にひっぱったところ、剥離することはなかった。引っ張り強度試験を行ったところ、機械的に298N/cm2の力をかけたときに剥離した。従来の糖アルコールエステル材料(上記特許文献2)の限界の接着強度50N/cm2を大きく上回った。
特許文献3に記載の、下記の化学式Bで示される高分子液晶化合物(B)(重量平均分子量16500)を少量とり、ヒートガンで加熱して液化させ、ガラス板(15mm幅、1mm厚)2枚で挟み薄くのばし室温まで冷却した。この材料を挟み込んだガラス2枚を人差し指と親指で挟んでずらそうと力を加えたが全く動かず、強い接着力が見られた。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温で3分間照射(36J/cm2)したところ、ガラス間の材料が液化し、これに伴う接着力の低下によって、ガラス2枚は指で挟んで容易に(5N/cm2以下で)ずらすことができた。
この状態で、ガラスに可視光を照射(1J/cm2)すると、材料の固化に伴う接着力の復帰に伴い、指で挟んでずらそうと力を加えても再び動かなくなった。このとき剥離するまで反対方向に引っ張ったところ、280N/cm2の力を加えたときに剥離した。
特許文献3に記載の、下記の化学式Cで示される高分子液晶化合物(C)(重量平均分子量18000)を少量とり、120℃まで加熱して液化させガラス板(15mm幅、1mm厚)2枚で挟み薄くのばし室温まで冷却した。この材料を挟み込んだガラス2枚を人差し指と親指で挟んでずらそうと力を加えたが全く動かず、強い接着力が見られた。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温で3分間照射(36J/cm2)したところ、ガラス間の材料が液化し、これに伴う接着力の低下によって、ガラス2枚は指で挟んで容易に(5N/cm2以下で)ずらすことができた。
この状態で、LED光源を用いて中心波長510nmの可視光を照射(1J/cm2)すると、材料の固化に伴う接着力の復帰に伴い、指で挟んでずらそうと力を加えても再び動かなくなった。このとき剥離するまで反対方向に引っ張ったところ、193N/cm2の力を加えたときに剥離した。
特許文献3に記載の、下記の化学式Dで示される高分子液晶化合物(D)(重量平均分子量9600)を少量とり、ヒートガンで加熱して液化させガラス板(15mm幅、1mm厚)2枚で挟み薄くのばし室温まで冷却した。この材料を挟み込んだガラス2枚を人差し指と親指で挟んでずらそうと力を加えたが全く動かず、強い接着力が見られた。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温で3分間照射(36J/cm2)したところ、ガラス間の材料が軟化し、これに伴う接着力の低下によって、ガラス2枚を20N/cm2の力でずらすことができた。
この状態で、LED光源を用いて中心波長510nmの可視光を照射(1J/cm2)すると、材料の固化に伴う接着力の復帰に伴い、指で挟んでずらそうと力を加えても再び動かなくなった。このとき剥離するまで反対方向に引っ張ったところ、280N/cm2の力を加えたときに剥離した。
特許文献3に記載の、下記の化学式Eで示される高分子液晶化合物(E)(重量平均分子量8100)を少量とり、120℃まで加熱して液化させガラス板(15mm幅、1mm厚)2枚で挟み薄くのばし室温まで冷却した。この材料を挟み込んだガラス2枚を人差し指と親指で挟んでずらそうと力を加えたが全く動かず、強い接着力が見られた。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温で3分間照射(36J/cm2)したところ、ガラス間の材料が液化し、これに伴う接着力の低下によって、ガラス2枚は指で挟んで容易に(5N/cm2以下で)ずらすことができた。
この状態で、LED光源を用いて中心波長510nmの可視光を照射(1J/cm2)すると、材料の固化に伴う接着力の復帰に伴い、指で挟んでずらそうと力を加えても再び動かなくなった。このとき剥離するまで反対方向に引っ張ったところ、202N/cm2の力を加えたときに剥離した。
下記の式に示される化合物の合成
実施例12で得られた化合物を少量とり、ヒートガンで加熱して液化させガラス板(12mm幅、1mm厚)2枚で挟み薄くのばし室温まで冷却した。この材料を挟み込んだガラス2枚を人差し指と親指で挟んでずらそうと力を加えたが全く動かず、強い接着力が見られた。これにLED光源(日亜)を用いて、中心波長366nmの紫外線を室温で1分間照射(12J/cm2)したところ、ガラス間の材料が液化し、これに伴う接着力の低下によって、ガラス2枚は指で挟んで容易にずらすことができた。
この状態で、LED光源を用いて中心波長510nmの可視光を照射(1J/cm2)すると、材料の固化に伴う接着力の復帰に伴い、指で挟んでずらそうと力を加えても再び動かなくなった。このとき剥離するまで反対方向に引っ張ったところ、210N/cm2の力を加えたときに剥離した。
次に接着した状態から、366nm付近の紫外線を室温で3分間照射(6J/cm2))したところ、ガラス間の接着層が液化した。引き続き可視光を照射すると固化した。このスライドガラスを剥離するまで反対方向に引っ張ったところ、100N/cm2の力を加えたときに剥離した。これらの剥離強度(50-100N/cm2)は、実施例と比較して低かった。
Claims (9)
- 下記の一般式(1)
で表される光反応性側鎖を2つ以上もつ液晶性化合物を主成分とする光応答性接着剤であって、該液晶性化合物が、
下記一般式(2)
で表される単量体を重合して得られる重量平均分子量が1000~100000の高分子液晶性化合物、又は下記一般式(3)
で表される糖アルコール誘導体であることを特徴とする光応答性接着剤。 - 光を照射して流動化することにより脱着を行うことが可能な請求項1に記載の光応答性接着剤。
- 前記の光照射が、光波長300~400nmの紫外光によるものであり、その露光量が0.1~200J/cm2であることを特徴とする請求項2に記載の光応答性接着剤。
- 流動化に用いる光とは異なる波長の光を照射して非流動化することにより接着を行うことが可能な請求項1~3のいずれか1項に記載の光応答性接着剤。
- 前記の光照射が、波長400~600nmの光によるものであることを特徴とする請求項4に記載の光応答性接着剤。
- 異なる波長の光を照射して可逆的に流動化・非流動化させることにより繰り返しの接着脱着が可能な請求項1~5のいずれか1項に記載の光応答性接着剤。
- 請求項1~6のいずれか1項に記載の光応答性接着剤を用い、異なる波長の光を照射することにより、可逆的な流動化・非流動化による脱着・接着を行う方法。
- 波長300~400nmの紫外光を照射することにより、流動化による脱着を行う請求項7に記載の方法。
- 波長400~600nmの光を照射することにより、非流動化による接着を行う請求項7に記載の方法。
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