KR102344755B1 - Temperature sensitive adhesive - Google Patents

Abstract

The temperature-sensitive adhesive of the present invention contains a tackifier and a side chain crystalline polymer, the adhesive strength decreases at a temperature below the melting point of the side chain crystalline polymer, the tackifier has a softening point of 140° C. or more, and the content is side chain 40 to 100 parts by weight based on 100 parts by weight of the crystalline polymer. Thereby, the ratio of the side chain crystalline polymer in a temperature-sensitive adhesive can be decreased to an appropriate degree, maintaining adhesiveness, As a result, in the temperature below melting|fusing point, adhesive force falls enough and peelability can be improved.

Description

Temperature-sensitive adhesive {TEMPERATURE SENSITIVE ADHESIVE}

The present invention relates to a temperature-sensitive adhesive.

In manufacturing processes, such as a flat panel display (FPD), an adhesive sheet, an adhesive tape, etc. are used for the temporary fixation of the board|substrate which consists of glass, plastic, etc.. The easily peelable property is calculated|required for the adhesive tape etc. used for such a use when peeling the adhesive tape once adhered again.

The present applicant has developed the temperature-sensitive adhesive tape described in Patent Document 1 previously as an adhesive tape suitable for temporarily fixing. In the temperature-sensitive adhesive tape, the pressure-sensitive adhesive layer contains a side-chain crystalline polymer, and when cooled to a temperature below the melting point of the side-chain crystalline polymer, the side-chain crystalline polymer crystallizes, thereby reducing adhesive strength.

However, even if the conventional temperature-sensitive adhesive tape as described in Patent Document 1 was used, the substrate was sometimes damaged at the time of peeling. In such a case, in order to peel without damaging a board|substrate, it was necessary to cool down to the temperature (for example, 5 degreeC) lower than room temperature (23 degreeC). Therefore, the conventional temperature-sensitive adhesive tape requires a process of cooling to a temperature lower than room temperature, and as a result, equipment and environment are required, and the cost may increase with it. This problem was remarkable when peeling a temperature-sensitive adhesive tape from a board|substrate exposed in high temperature atmosphere of 100 degreeC or more together with a temperature-sensitive adhesive tape.

Japanese Patent Laid-Open No. 9-251923

An object of the present invention is to provide a temperature-sensitive adhesive having excellent releasability.

The temperature-sensitive adhesive of the present invention contains a tackifier and a side chain crystalline polymer, the adhesive strength decreases at a temperature below the melting point of the side chain crystalline polymer, the tackifier has a softening point of 140° C. or more, and the content is side chain 40 to 100 parts by weight based on 100 parts by weight of the crystalline polymer.

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that it is excellent in peelability.

<Temperature Sensitive Adhesive>

Hereinafter, a temperature-sensitive adhesive according to an embodiment of the present invention will be described in detail.

The thermosensitive adhesive of this embodiment contains a side chain crystalline polymer, and adhesive force falls at the temperature below melting|fusing point of a side chain crystalline polymer.

(branched crystalline polymer)

The side chain crystalline polymer is a polymer having a melting point, and crystallizes at a temperature below the melting point, and exhibits fluidity due to a phase change at a temperature above the melting point. That is, the branched chain crystalline polymer has temperature sensitivity to reversibly generate a crystalline state and a fluid state in response to a temperature change. Thereby, the physical property which causes adhesion-non-adhesion reversibly corresponding to a temperature change can be provided to a temperature-sensitive adhesive.

The melting point is the temperature at which a specific portion of the polymer, which was initially aligned in an orderly arrangement, becomes disordered by a certain equilibrium process, and is a value obtained by measuring with a differential thermal scanning calorimeter (DSC) at a measurement condition of 10° C./min. to mean

The thermosensitive adhesive of this embodiment contains a side chain crystalline polymer in the ratio which adhesive force falls when a side chain crystalline polymer crystallizes at the temperature below melting|fusing point. That is, the temperature-sensitive adhesive of the present embodiment contains a side chain crystalline polymer as a main component and is substantially composed of a side chain crystalline polymer. When cooled to a lower temperature, the side chain crystalline polymer crystallizes, thereby reducing the adhesive force. In addition, when the temperature-sensitive adhesive is heated to a temperature equal to or higher than the melting point of the side-chain crystalline polymer, the side-chain crystalline polymer exhibits fluidity, thereby restoring adhesive strength, and thus can be used repeatedly.

It is preferable that it is 24 degreeC or more, and, as for melting|fusing point of a branched crystalline polymer, it is more preferable that it is 25 degreeC or more, and it is still more preferable that it is 26 degreeC or more. Thereby, since the side chain crystalline polymer is crystallized at room temperature (23 degreeC), room temperature peeling becomes possible. As an upper limit of melting|fusing point, it is preferable that it is 60 degrees C or less. Melting|fusing point can be adjusted by changing the composition of a side chain crystalline polymer, etc.

The side chain crystalline polymer is not particularly limited as long as it is a polymer having temperature sensitivity that reversibly causes a crystalline state and a fluid state in response to a change in temperature, but it is preferably a copolymer of a reactive fluorine compound and another monomer constituting the side chain crystalline polymer do. As a result, when the temperature-sensitive adhesive is cooled to a temperature below the melting point of the side chain crystalline polymer, in addition to the decrease in adhesive force due to crystallization of the side chain crystalline polymer, releasability due to the fluorine compound is also added. It can be lowered and can be easily peeled from an adherend.

A reactive fluorine compound shall mean the fluorine compound which has a functional group which shows reactivity. Examples of the reactive functional group include groups having an ethylenically unsaturated double bond such as a vinyl group, an allyl group, a (meth)acryl group, a (meth)acryloyl group, and a (meth)acryloxy group; an epoxy group (including a glycidyl group and an epoxycycloalkyl group); mercapto group; carbinol group; carboxyl group; silanol group; phenol group; amino group; A hydroxyl group etc. are mentioned.

Specific examples of the reactive fluorine compound include compounds represented by the following general formula (I).

[Wherein, R ₁ represents a group: CH ₂ =CHCOOR ² - or CH ₂ =C(CH ₃ )COOR ² - (wherein R ² represents an alkylene group)]

^{As an alkylene group which R<2>} represents in general formula (I), For example, C1, such as a methylene group, an ethylene group, a trimethylene group, a methylethylene group, a propylene group, a tetramethylene group, a pentamethylene group, a hexamethylene group and 6 straight-chain or branched alkylene groups, and the like.

Specific examples of the compound represented by the general formula (I) include compounds represented by the following formulas (Ia) and (Ib).

A commercially available thing can be used for a reactive fluorine compound. Commercially available reactive fluorine compounds are, for example, all manufactured by Osaka Organic Chemical Industry Ltd. “Viscoat 3F”, “Viscoat 3FM”, “Viscoat 4F”, “Viscoat 8F”, “Viscoat 8FM”, KYOEISHA CHEMICAL CO., LTD. "LIGHT ESTERM-3F" of the product, etc. are mentioned.

On the other hand, as another monomer constituting the side chain crystalline polymer, for example, (meth)acrylate having a linear alkyl group having 16 or more carbon atoms, (meth)acrylate having an alkyl group having 1 to 6 carbon atoms, a polar monomer, etc. can

As (meth)acrylate which has a C16 or more linear alkyl group, For example, cetyl (meth)acrylate, stearyl (meth)acrylate, eicosyl (meth)acrylate, behenyl (meth)acrylate, etc. and (meth)acrylates having a linear alkyl group having 16 to 22 carbon atoms. Examples of the (meth)acrylate having an alkyl group having 1 to 6 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, and hexyl (meth)acrylate. . Examples of the polar monomer include carboxyl group-containing ethylenically unsaturated monomers such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, and fumaric acid; The ethylenically unsaturated monomer etc. which have hydroxyl groups, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxyhexyl (meth)acrylate, are mentioned. You may use these 1 type or in mixture of 2 or more types. In addition, (meth)acrylate shall mean an acrylate or a methacrylate.

The branched crystalline polymer is preferably a (meth)acrylate having a linear alkyl group having at least 16 carbon atoms, preferably having 18 or more carbon atoms, as another monomer constituting the branched crystalline polymer. In addition, from the viewpoint of obtaining a good balance between adhesion and releasability, the side chain crystalline polymer is a (meth)acrylate having a linear alkyl group having 16 or more carbon atoms, (meth)acrylate having an alkyl group having 1 to 6 carbon atoms, and a polar monomer. It is preferable to use other monomers constituting the branched crystalline polymer. In particular, the branched crystalline polymer is preferably stearyl acrylate, methyl acrylate and acrylic acid as other monomers constituting the branched crystalline polymer. In this case, it is preferable that the polymerization ratio of methyl acrylate is larger than the polymerization ratio of stearyl acrylate and the polymerization ratio of acrylic acid.

The composition of the branched crystalline polymer is preferably a copolymer obtained by polymerizing a reactive fluorine compound and other monomers constituting the branched crystalline polymer in a weight ratio of 1:99 to 20:80, preferably 1:99 to 10:90. .

In addition, the composition of the side chain crystalline polymer is 1 to 20 parts by weight of the reactive fluorine compound, preferably 1 to 10 parts by weight, and 10 to 99 parts by weight of (meth)acrylate having a linear alkyl group having 16 or more carbon atoms, preferably Preferably, a copolymer obtained by polymerizing 20 to 99 parts by weight, 0 to 70 parts by weight of (meth)acrylate having an alkyl group having 1 to 6 carbon atoms, and 0 to 10 parts by weight of a polar monomer is preferable, and a reactive fluorine compound 1 to 10 parts by weight of, 25 to 30 parts by weight of (meth)acrylate having a linear alkyl group having 16 or more carbon atoms, 60 to 65 parts by weight of (meth)acrylate having an alkyl group having 1 to 6 carbon atoms, and polarity A copolymer obtained by polymerizing the monomer in a proportion of 1 to 10 parts by weight is more preferable.

The weight average molecular weight of the side chain crystalline polymer is preferably 100,000 or more, preferably 300,000 to 900,000, and more preferably 400,000 to 600,000. When the weight average molecular weight is too small, when the temperature-sensitive adhesive is peeled from the adherend, the temperature-sensitive adhesive remains on the adherend, and there is a fear that so-called adhesive residues may increase. Moreover, since it will become difficult to crystallize even if it makes a side chain crystalline polymer at the temperature below melting|fusing point when a weight average molecular weight is too large, adhesive force will become difficult to fall. The weight average molecular weight is a value obtained by measuring the side chain crystalline polymer by gel permeation chromatography (GPC) and converting it into polystyrene.

(tackifier)

The thermosensitive adhesive of this embodiment further contains a tackifier in addition to the above-mentioned side chain crystalline polymer. The softening point of the tackifier of this embodiment is 140 degreeC or more, Preferably it is 150 degreeC or more. Although the upper limit of a softening point is not specifically limited, Since preparation of the tackifier of too high softening point is difficult, it is 170 degrees C or less normally, Preferably it is 165 degrees C or less. The softening point is a value measured according to the ring-ball method prescribed in JIS K 5902.

In the present embodiment, the above-described tackifier is contained in an amount of 40 to 100 parts by weight, preferably 50 to 100 parts by weight, based on 100 parts by weight of the side chain crystalline polymer. When a high softening point tackifier having a softening point of 140° C. or higher is contained in such a high proportion, the proportion of the branched chain crystalline polymer in the temperature sensitive pressure sensitive adhesive can be appropriately reduced while maintaining the adhesiveness required for fixing the adherend, and therefore the melting point At a lower temperature, adhesive force fully falls, and peelability improves as a result. That is, according to this embodiment, peelability can be easily improved by containing the tackifier of a high softening point in a specific ratio without changing the composition of a side chain crystalline polymer. Therefore, for example, if the melting point of the side chain crystalline polymer is 24°C or higher, it becomes possible to reliably peel at room temperature without cooling to a temperature lower than room temperature (23°C) (eg 5°C). Moreover, since the thermosensitive adhesive of this embodiment is excellent in peelability, even if it exposes the to-be-adhered to-be-adhered body to the temperature of 100-220 degreeC, if it cools to a temperature below melting|fusing point, it can peel a to-be-adhered body smoothly.

The composition of the tackifier is not particularly limited as long as the softening point is 140° C. or higher. For example, a rosin-based resin, a terpene-based resin, a hydrocarbon-based resin, an epoxy-based resin, a polyamide-based resin, a phenol-based resin, a ketone-based resin, etc. These are mentioned, You may use these 1 type or in mixture of 2 or more types. Among these exemplified tackifiers, rosin-based resins are preferable from the viewpoint of excellent compatibility with the above-mentioned side chain crystalline polymer.

As rosin-type resin, a rosin derivative etc. are mentioned, for example. Examples of rosin derivatives include ester compounds of rosin obtained by esterifying unmodified rosin (raw rosin) such as gum rosin, wood rosin, and tall oil rosin with alcohol, and modified rosin such as hydrogenated rosin, disproportionated rosin, and polymerized rosin. rosin esters such as an ester compound of a modified rosin obtained by esterification with alcohol; metal salts of rosins, such as unmodified rosin, modified rosin, and various rosin derivatives; and rosin phenol resins obtained by adding phenol to unmodified rosin, modified rosin, various rosin derivatives, etc. with an acid catalyst and thermally polymerizing them.

Among these rosin derivatives exemplified, polymerized rosin esters are particularly preferable. As the polymerization rosin ester, a commercially available one can be used. As a specific example, for example, Arakawa Chemical Industries, Ltd. "PENSEL D-160" of a product, etc. are mentioned.

(crosslinking agent)

It is preferable that a temperature-sensitive adhesive contains a crosslinking agent. As a crosslinking agent, a metal chelate compound, an aziridine compound, etc. are mentioned, for example, A metal chelate compound is especially preferable. When a metal chelate compound is employ|adopted as a crosslinking agent, there exists a tendency for the heat resistance of a temperature sensitive adhesive to improve.

As a metal chelate compound, the acetylacetone coordination compound of a polyvalent metal, an acetoacetic acid ester coordination compound, etc. are mentioned, for example. Examples of the polyvalent metal include aluminum, nickel, chromium, iron, titanium, zinc, cobalt, manganese, and zirconium. You may use these 1 type or in mixture of 2 or more types. Among these exemplified metal chelate compounds, an aluminum acetylacetone coordination compound or an acetoacetic acid ester coordination compound is preferable, and aluminum trisacetylacetonate is preferable.

It is preferable that content of a crosslinking agent is 0.1-12 weight part with respect to 100 weight part of side chain crystalline polymers. When a metal chelate compound is employed as the crosslinking agent, the content thereof is preferably 0.1 to 12 parts by weight, more preferably 5 to 12 parts by weight, and still more preferably 8 to 12 parts by weight, based on 100 parts by weight of the side chain crystalline polymer. .

(additive)

The thermosensitive adhesive may contain various additives, such as a plasticizer, antioxidant, and a ultraviolet absorber, for example.

<Method for manufacturing temperature-sensitive adhesive>

The method for producing the temperature-sensitive adhesive is not particularly limited, and for example, a tackifier is added to a copolymer solution obtained by polymerization of a side chain crystalline polymer obtained by polymerizing a monomer constituting a side chain crystalline polymer and a solvent to obtain a coating solution, The method of drying this coating liquid, etc. are mentioned.

The polymerization method of the side chain crystalline polymer is not particularly limited, and, for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method and the like are employable. For example, when the solution polymerization method is employed, the above-mentioned monomer constituting the side chain crystalline polymer may be mixed with a solvent and stirred at about 40 to 90° C. for about 2 to 10 hours. A well-known thing can be used as a solvent. When the temperature-sensitive adhesive contains a crosslinking agent or additive, the crosslinking agent or additive may be added to the copolymer solution.

<Temperature-sensitive adhesive sheet>

The thermosensitive adhesive sheet of this embodiment consists of the above-mentioned thermosensitive adhesive, and is a base material-less sheet-like form. The thickness of the temperature-sensitive adhesive sheet is not particularly limited, and is preferably 15 to 400 µm. It is preferable to laminate a release film on the surface of the temperature-sensitive adhesive sheet. As a release film, what apply|coated mold release agents, such as silicone, to the surface of the film which consists of polyethylene terephthalate etc., for example is mentioned.

<Temperature Sensitive Adhesive Tape>

The thermosensitive adhesive tape of this embodiment laminates|stacks the adhesive layer which consists of the above-mentioned thermosensitive adhesive on the single side|surface or both surfaces of a film-form base material. That is, the configuration of the temperature-sensitive adhesive tape includes a two-layer configuration comprising a film-like substrate and an adhesive layer laminated on one side of the substrate; Alternatively, it has a three-layer structure comprising a film-like substrate and an adhesive layer laminated on both surfaces of the substrate, respectively. A film form is not limited only to a film form, As long as the effect of this embodiment is not impaired, it is a concept including a film form or a sheet form.

As a constituent material of the base material, for example, polyethylene, polyethylene terephthalate, polypropylene, polyester, polyamide, polyimide, polycarbonate, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene polypropylene copolymer, poly Synthetic resins, such as vinyl chloride, are mentioned.

Either a single layer body or a multilayer body may be sufficient as a base material, and the thickness is about 5-500 micrometers normally. From the viewpoint of improving the adhesion to the pressure-sensitive adhesive layer, the substrate may be subjected to surface treatment such as corona discharge treatment, plasma treatment, blast treatment, chemical etching treatment, and primer treatment.

In order to form the pressure-sensitive adhesive layer on one or both surfaces of the substrate, for example, the above-described coating liquid may be applied to one or both surfaces of the substrate by a coater or the like and dried. As a coater, a knife coater, a roll coater, a calender coater, a comma coater, a gravure coater, a rod coater etc. are mentioned, for example.

The thickness of an adhesive layer is not specifically limited, Preferably it is 5-60 micrometers, More preferably, it is 10-60 micrometers, More preferably, it is 10-50 micrometers.

When the temperature-sensitive adhesive tape has a three-layer structure, the thickness and composition of the pressure-sensitive adhesive layer on one side and the pressure-sensitive adhesive layer on the other side may be the same or different.

The pressure-sensitive adhesive layer on the other side may be constituted by, for example, a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive. The pressure-sensitive adhesive is a polymer having adhesiveness, and examples thereof include a natural rubber adhesive, a synthetic rubber adhesive, a styrene/butadiene latex-based adhesive, and an acrylic adhesive.

It is preferable to laminate a release film on the surface of the temperature-sensitive adhesive tape. As a release film, what apply|coated mold release agents, such as silicone, to the surface of the film which consists of polyethylene terephthalate etc., for example is mentioned.

The thermosensitive adhesive of this embodiment mentioned above can be used suitably as an adhesive in the field|area which requires easy peelability. Specifically, the temperature-sensitive adhesive of the present embodiment is suitable for temporarily fixing a substrate made of glass, plastic, etc., which has been enlarged and thinned in LEDs or FPDs, etc., and is particularly suitable for temporary fixing of plastic substrates in the manufacturing process of FPD. can be used The same applies to this point and the temperature-sensitive adhesive sheet and the temperature-sensitive adhesive tape of the present embodiment described above.

Hereinafter, the present invention will be described in detail with reference to Synthesis Examples and Examples, but the present invention is not limited to the following Synthesis Examples and Examples. In addition, in the following description, "part" means a weight part.

(Synthesis example)

28 parts of stearyl acrylate, 62 parts of methyl acrylate, 5 parts of acrylic acid, and 5 parts of a reactive fluorine compound (“Viscoat 3F” manufactured by Osaka Organic Chemical Industry Ltd. represented by the above formula (Ia)) in 5 parts In each ratio, 200 parts of a mixed solvent of ethyl acetate:toluene = 8:2 (weight ratio) was added and mixed, followed by stirring at 55°C for 4 hours to polymerize these monomers. The weight average molecular weight of the side chain crystalline polymer which is the obtained copolymer was 525,000, and melting|fusing point was 26 degreeC. In addition, a weight average molecular weight is the value which carried out polystyrene conversion of the measured value obtained by measuring a copolymer by GPC. The melting point is a value measured using DSC under measurement conditions of 10° C./min.

[Examples 1-4 and Comparative Examples 1-3]

<Production of temperature-sensitive adhesive sheet>

First, the copolymer obtained by the synthesis example was adjusted so that solid content might be 30 weight% using ethyl acetate, and the copolymer solution was obtained. Next, to 100 parts of this copolymer solution, a tackifier (polymerized rosin ester "PENSEL D-160" with a softening point of 150° C. or higher manufactured by Arakawa Chemical Industries, Ltd.) in terms of solid content was added in the proportion shown in Table 1, and aluminum Trisacetylacetonate (manufactured by Kawaken Fine Chemicals Co., Ltd.) was further added at a ratio of 10 parts to obtain a coating solution.

This coating liquid was apply|coated on the release film, it was heated at 100 degreeC for 10 minute(s), it was made to crosslinking-react, and the 25-micrometer-thick thermosensitive adhesive sheet which consists of a thermosensitive adhesive was obtained. In addition, the 50-micrometer-thick thing which apply|coated silicone on the surface of the polyethylene terephthalate film was used for the release film.

<Evaluation>

The 180 degree peeling strength was evaluated about the obtained temperature-sensitive adhesive sheet. While the evaluation method is shown below, the result is shown in Table 1.

(180° peel strength)

About the obtained temperature-sensitive adhesive sheet, the 180 degree peeling strength in each atmospheric temperature of 50 degreeC and 23 degreeC was measured based on JISZ0237. Specifically, first, a polyimide film having a width of 25 mm and a thickness of 25 μm (“100H” manufactured by DU PONT-TORAY CO., LTD.) is placed on a glass pedestal under the following conditions through a temperature-sensitive adhesive sheet from which the release film has been removed. stuck Next, the adhered polyimide film was peeled 180 degrees at a speed of 300 mm/min using a load cell.

(50℃)

After affixing a polyimide film to a pedestal and leaving it still for 20 minutes through the thermosensitive adhesive sheet at 50 degreeC atmospheric temperature, it peeled 180 degrees and measured peeling strength. From the measured value of peeling strength, the following reference|standard evaluated adhesiveness.

○: 0.05N/25mm or more

×: less than 0.05N/25mm

(23℃)

The polyimide film is adhered to the pedestal through the thermosensitive adhesive sheet at an atmospheric temperature of 50° C., the atmospheric temperature is raised to 200° C., and after standing at this atmospheric temperature for 20 minutes, the atmospheric temperature is lowered to 23° C., the atmosphere After leaving still at temperature for 20 minutes, it peeled 180 degrees and measured peeling strength. The following criteria evaluated peelability from the measured value of peeling strength.

○: 0.4N/25mm or less

×: higher than 0.4N/25mm

As is clear from Table 1, in Comparative Examples 1 and 2, the content of the tackifier was less than 40 parts by weight with respect to 100 parts by weight of the side chain crystalline polymer, and the proportion of the side chain crystalline polymer was too high, so 50 ° C. (more than the melting point) temperature), while not having peelability at 23°C (room temperature).

In Examples 1 to 4, since the content of the tackifier is 40 to 100 parts by weight based on 100 parts by weight of the side chain crystalline polymer, it has adhesion at 50° C. (temperature above the melting point) and peelability at 23° C. (room temperature). It can be seen that has

On the other hand, in Comparative Example 3, the content of the tackifier exceeded 100 parts by weight with respect to 100 parts by weight of the side chain crystalline polymer, and the proportion of the side chain crystalline polymer was too low, so that it did not stick even at 50 ° C. (temperature above the melting point) is guessed

Moreover, in the comparative example 1, the peeling strength in 23 degreeC lower than melting|fusing point (26 degreeC) showed the value higher than the peeling strength in 50 degreeC higher than melting|fusing point. It is presumed that this is mainly the effect of the anchor effect. That is, in the measurement of peeling strength in 23 degreeC, in order to expose a temperature-sensitive adhesive sheet to high temperature (200 degreeC) once, an anchor effect is expressed in a cooling process, and adhesive force becomes high. In Comparative Example 1, since there is little content of a tackifier, there are many ratios of a side chain crystalline polymer, Therefore, it is guessed that it was influenced by the anchor effect largely and became the result mentioned above.

Claims (16)

As a temperature-sensitive adhesive containing a tackifier and a side chain crystalline polymer, the adhesive force decreases at a temperature below the melting point of the side chain crystalline polymer,
The tackifier has a softening point of 140° C. or higher, and the content is 50 to 100 parts by weight based on 100 parts by weight of the side chain crystalline polymer,
The side chain crystalline polymer is a thermosensitive adhesive, characterized in that it consists of a copolymer of a reactive fluorine compound and another monomer constituting the side chain crystalline polymer. The method of claim 1,
The temperature-sensitive adhesive, characterized in that the melting point is 24 ℃ or more. The method of claim 1,
The pressure-sensitive adhesive, characterized in that the tackifier is a polymerized rosin ester. delete The method of claim 1,
The reactive fluorine compound is a temperature-sensitive adhesive, characterized in that the compound represented by the following general formula (I).

[Wherein, R ₁ represents a group: CH ₂ =CHCOOR ² - or CH ₂ =C(CH ₃ )COOR ² - (wherein R ² represents an alkylene group)] The method of claim 1,
Another monomer constituting the branched crystalline polymer is a (meth)acrylate having at least a linear alkyl group having 16 or more carbon atoms. The method of claim 1,
Other monomers constituting the branched crystalline polymer are (meth)acrylate having a linear alkyl group having 16 or more carbon atoms, (meth)acrylate having an alkyl group having 1 to 6 carbon atoms, and a polar monomer. The method of claim 1,
Other monomers constituting the side chain crystalline polymer are stearyl acrylate, methyl acrylate and acrylic acid. 9. The method of claim 8,
The polymerization ratio of the methyl acrylate is greater than the polymerization ratio of the stearyl acrylate and the polymerization ratio of the acrylic acid pressure-sensitive adhesive. The method of claim 1,
The weight average molecular weight of the side chain crystalline polymer is a temperature-sensitive adhesive, characterized in that 400,000 to 600,000. The method of claim 1,
A temperature-sensitive adhesive further comprising a metal chelate compound. 12. The method of claim 11,
The content of the metal chelate compound is 8 to 12 parts by weight based on 100 parts by weight of the side chain crystalline polymer. The method of claim 1,
A temperature-sensitive adhesive, characterized in that the adherend is exposed to a temperature of 100 to 220° C. and then peeled off at a temperature below the melting point. The method of claim 1,
A temperature-sensitive adhesive for temporarily fixing a plastic substrate in a manufacturing process of a flat panel display. A thermosensitive adhesive sheet comprising the thermosensitive adhesive according to claim 1 . A temperature-sensitive adhesive tape formed by laminating a pressure-sensitive adhesive layer comprising the temperature-sensitive adhesive according to claim 1 on one or both surfaces of a film-like substrate.