JP4162286B2 - Adhesive composition and its adhesive sheet - Google Patents

Description

【００４５】
上記の表１の結果から明らかなように、本発明の実施例１〜５の各粘着テ―プは、粘着力および剥離ライナの剥離性にすぐれるとともに、初期粘着性の点でもすぐれていることがわかる。これに対して、比較例１の粘着テ―プは、粘着力および剥離ライナの剥離性にはすぐれているが、初期粘着性に劣つており、また、比較例２の粘着テ―プでは、初期粘着性にすぐれているが、粘着力がやや低く、そのうえ剥離ライナの剥離性に劣つている。
【００４６】
【発明の効果】
以上のように、本発明は、特定のポリカ―ボネ―ト構造とともに、環式または非環式の特定のジオイルないしジオ―ル構造を持つ縮合系重合体を主成分としたことにより、粘着力が大きく、かつシリコ─ン処理を施していない剥離ライナの剥離性にすぐれるとともに、初期粘着性の改善された粘着剤組成物とその粘着シ―ト類を提供することができ、これらは、シリコンの存在を好まない電子機器用途などのほか、瞬間的な接着が必要な高速連続接着作業や接着後直ちに応力がかかるような用途などに対しても、十分に使用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive composition containing a condensation polymer such as polyester as a main component, and a pressure-sensitive adhesive sheet thereof.
[0002]
[Prior art]
As a pressure-sensitive adhesive composition containing a condensation polymer as a main component, for example, Japanese Patent Application Laid-Open No. 9-263737 discloses a pressure-sensitive adhesive composition containing a polyester containing a polycarbonate structure as a main component. This type of pressure-sensitive adhesive composition is basically highly elastic at room temperature, non-adhesive or low-adhesive (tack-free), and has the advantage that it is difficult to inadvertently adhere to parts other than the target due to this property. ing.
[0003]
The adhesive tape has a release liner bonded to the adhesive surface from the viewpoint of protecting the adhesive surface or handling. As the release liner, acrylic film or rubber-based adhesive tape uses a plastic film whose surface has been subjected to a silicone treatment in order to obtain good release properties. In the adhesive tape using the adhesive composition containing as a main component, a sufficiently good release property can be obtained even when a release liner made of polyolefin film or the like and not subjected to a silicone treatment is used. With such a release liner that has not been treated with silicon, there is no concern about the transfer of silicon to the adhesive surface, and it can be used without any problems for applications that do not like the presence of silicon. Has advantages.
[0004]
[Problems to be solved by the invention]
However, the known pressure-sensitive adhesive composition mainly composed of a condensation polymer such as polyester containing a polycarbonate structure has the above-mentioned advantages, but it is used for applications that require instantaneous bonding, for example, high-speed continuous bonding work. In applications where stress is applied immediately after bonding, the initial tackiness is poor, so it cannot be used.
[0005]
In view of such circumstances, the present invention is a pressure-sensitive adhesive composition containing a condensation polymer as a main component, and has good peelability even when a release liner that has high adhesive strength and is not subjected to a silicon treatment is used. In addition, the present invention has an object to provide a pressure-sensitive adhesive composition having improved initial tackiness and a pressure-sensitive adhesive sheet thereof.
[0006]
[Means for Solving the Problems]
As a result of diligent studies to achieve the above object, the present inventors have found that aliphatic diols having a polycarbonate structure are used as raw material components in obtaining condensation polymers such as polyester and polyurethane. When hydrogenated dimer acid formed by hydrogenating dimer acid of unsaturated fatty acid having 18 carbon atoms such as linoleic acid or hydrogenated dimer diol obtained by reducing the dicarboxylic acid is used together with dicarboxylic acid, A condensation polymer having a specific polycarbonate structure and a cyclic or acyclic specific dioil or diol structure derived from the above dimer acid or hydrogenated dimer diol is obtained, According to this, it was found that a pressure-sensitive adhesive composition having a high adhesive force and exhibiting good peelability even for a release liner not subjected to silicon treatment and having improved initial tackiness was obtained. The present invention Those were Itaritsu to be formed.
[0007]
That is, the present invention provides a) the following formula (A);
-(O-R-O-C) n-
‖… (A)
O
(R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms)
And b) the following formula (B1);
-C-R ¹ -C-
‖ ‖… (B1)
O O
(R ¹ is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms)
Or the following formula (B2):
—O—R ² —O— (B2)
(R ² is a C36 cyclic or acyclic saturated hydrocarbon group)
A pressure-sensitive adhesive composition comprising a condensation polymer having at least one of the structures represented by the formula (Claim 1), and particularly represented by the formula (B1). The structure is derived from a hydrogenated dimer acid obtained by hydrogenating a dimer acid of an unsaturated fatty acid having 18 carbon atoms, and the structure represented by the above formula (B2) reduces the above hydrogenated dimer acid. Thus, a pressure-sensitive adhesive composition having the above-described structure, which is derived from a hydrogenated dimmer diol (claim 2), can be provided.
[0008]
The present invention also provides a sheet or tape-like pressure-sensitive adhesive sheet or tape having a layer composed of the pressure-sensitive adhesive composition having the above structure on one side or both sides of a support. It relates to a tape (Claim 3), and in particular, an adhesive sheet or tape (Claim 4) having the above structure in which a release liner that has not been subjected to a silicone treatment is bonded to the adhesive surface. It is possible to provide an adhesive sheet or tape having the above structure, in which the release liner that has not been treated is a polyolefin film comprising polyethylene, polypropylene, ethylene-propylene copolymer, or the like.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The condensation polymer used in the present invention has a polycarbonate structure represented by the above formula (A) as the structure of the a component and is represented by the above formula (B1) as the structure of the b component. A structure having at least one of a cyclic or acyclic dioil structure and a cyclic or acyclic diol structure represented by the formula (B2), As long as it has the structure of both components, the condensation form is not limited. The most typical one is polyester, and other examples include polyurethane, a mixture or co-condensate of this with polyester, and the like.
[0010]
The condensation polymer composed of polyester is represented by the formula (B1) together with a compound having a polycarbonate structure represented by the formula (A) as a raw material component comprising a dicarboxylic acid component and a diol component. A compound having a dioil structure, a compound having a diol structure represented by formula (B2), and having both a diol oil structure represented by formula (B1) and a diol structure represented by formula (B2) It can be obtained by using at least one of the compounds, adding a dicarboxylic acid component or a diol component other than these if necessary, and carrying out an esterification reaction by a conventional method. In the esterification reaction, the diol component and the dicarboxylic acid component are preferably equimolar reactions, but either one may be used in excess to promote the esterification reaction.
[0011]
The compound having a polycarbonate structure represented by the formula (A) includes a diol in which R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms, There are derivatives such as dicarboxylic acids and their lower alkyl esters. Of these, diols are readily available as commercial products and are particularly preferably used. Specifically, polyhexamethylene carbonate diol, poly (3-methylpentene carbonate) diol, poly (2-methyloctane) diol, polypropylene carbonate diol And their mixtures and copolymers.
[0012]
Examples of such commercially available diols include “PLACCEL CD208PL”, “PLACCEL CD210PL”, “PLACCEL CD220PL”, “PLACCEL CD208”, “PLACCEL CD210”, “PLACCEL CD220” manufactured by Daicel Chemical Industries, Ltd. ”,“ PLACCEL CD208HL ”,“ PLACCEL CD210HL ”,“ PLACCEL CD220HL ”, and the like.
[0013]
The compound having a dioil structure represented by the formula (B1) is a dicarboxylic acid or derivative thereof in which R ¹ is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms, and the above dicarboxylic acid As a dimer of an unsaturated fatty acid having 18 carbon atoms (industrially, an unsaturated fatty acid containing linoleic acid obtained from fats and oils such as safflower oil, soybean oil, linseed oil and tall oil) -A hydrogenated dimer acid obtained by hydrogenating a polymerized fatty acid composed of an acid, that is, a dimer, to a saturated carboxylic acid by an appropriate method can be mentioned. Examples of the derivatives include esters with lower alcohols, diols, and other polyhydric alcohols.
[0014]
The compound having a diol structure represented by the formula (B2) is a diol or derivative thereof in which R ² is a cyclic or acyclic saturated hydrocarbon group having 36 carbon atoms, Examples of the diol include a hydrogenated dimer diol obtained by reducing both carboxyl groups of the hydrogenated dimer acid to a primary alcohol group. Examples of the derivatives include esters with lower carboxylic acids, dicarboxylic acids and other polybasic acids. In addition, the compound having both the dioil structure represented by the formula (B1) and the diol structure represented by the formula (B2) includes the hydrogenated dimer acid and the hydrogenated dimer geo- Ester and the like.
[0015]
Other diol components other than these include linear diols such as ethylene glycol, propylene glycol, butane diol, hexane diol, octane diol, decane diol, and octadecane diol. Or branched diols. These other diol components are preferably 50% by weight or less in the diol component. In order to increase the molecular weight of the condensation polymer made of polyester, a small amount of a tri- or higher functional polyol component can be added.
[0016]
Examples of other dicarboxylic acid components include dicarboxylic acids having a molecular skeleton of an aliphatic or alicyclic hydrocarbon group having 2 to 20 carbon atoms. The hydrocarbon group may be linear or branched. Specifically, succinic acid, methyl succinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, tetrahydrophthalic acid, their acid anhydrides and lower Derivatives such as alkyl esters are mentioned.
[0017]
The condensation polymer composed of polyurethane uses only the diol component of the above compounds as a raw material component in the same combination as described above, and if necessary, adds the other diol component as described above. These can be obtained by urethanizing a polyisocyanate mainly composed of diisocyanate such as hexamethylene diisocyanate or diphenylmethane diisocyanate.
[0018]
In this invention, it can be set as the adhesive composition excellent in the adhesive characteristic by bridge | crosslinking such a condensation type polymer by a suitable means. Examples of the crosslinking means include a method using a so-called crosslinking agent in which a compound having a group that reacts with a hydroxyl group or a carboxyl group contained in a condensation polymer such as a polyisocyanate compound, an epoxy compound, or an aziridine compound is added and reacted. . Of the crosslinking agents, polyisocyanate compounds are particularly preferably used.
[0019]
Examples of the polyisocyanate compound include aliphatic polyisocyanates such as ethylene diisocyanate, butylene diisocyanate, and hexamethylene diisocyanate, cyclopentylene diisocyanate, and cyclohexylene diisocyanate. -Cycloaliphatic isocyanates such as isophorone diisocyanate, aromatic diisocyanates such as 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate -Toluene diisocyanate adduct of trimethylolpropane and isocyanate adducts such as hexamethylene diisocyanate adduct. These polyisocyanate compounds are used alone or in a mixture of two or more. The amount used is usually about 1 to 10 parts by weight per 100 parts by weight of the condensation polymer.
[0020]
The pressure-sensitive adhesive composition of the present invention comprises the above condensation polymer as a main component and is usually subjected to a crosslinking treatment as described above, and if necessary, various conventionally known tackifiers may be blended therein. In addition, various additives such as inorganic or organic fillers, powders such as metal powders and pigments, particulates, and foils can also be blended.
[0021]
The pressure-sensitive adhesive sheet of the present invention comprises a support made of a plastic film such as a polyester film, a non-woven fabric, paper or the like, and a layer formed of the above-mentioned pressure-sensitive adhesive composition on one or both sides of the support, particularly as described above. The treated layer is provided with a thickness of about 10 to 150 μm on one side so as to have a sheet-like or tape-like form, and a release liner is usually bonded to the adhesive surface consisting of the above layers. The
[0022]
As this release liner, a release liner that has not been subjected to silicon treatment can be used, and in particular, a polyolefin-based film is preferably used. Polyolefin films include polyethylene, polypropylene, polymethylpentene, ethylene-propylene copolymers or mixtures thereof, as well as films whose surfaces are processed with the same polyolefin as described above (for example, the above-mentioned polyolefin film and paper). And laminated films with other films).
[0023]
The pressure-sensitive adhesive sheet of the present invention constituted as described above has a layer composed of the above-mentioned pressure-sensitive adhesive composition, together with a specific polycarbonate structure represented by the formula (A), the formula (B1), By using a condensation polymer having a specific cyclic or acyclic dioil or diol structure represented by (B2) as a main component, improved initial tackiness is exhibited. In addition, the peel strength of the release liner made of the polyolefin film that has been applied to the adhesive surface and not treated with silicone is excellent, and it can be easily peeled off with little force when used. .
[0024]
In addition, Japanese Patent Application Laid-Open No. 8-41185 discloses a polyester carbonate containing a polyester of dimer fatty acid and dimer fatty acid polyol. However, this polyester carbonate is an aromatic polycarbonate material for the production of automobile bodies, and is intended to improve its fuel oil resistance and transparency. It is significantly different from those based on a condensation polymer having a polycarbonate structure, and there is no description or suggestion of using the above-mentioned polycarbonate material as an adhesive. Therefore, the existence of the above publication does not affect the novelty or inventive step of the present invention.
[0025]
【Example】
Next, examples of the present invention will be described in more detail. However, the scope of the present invention is not limited by the following examples. In the following, “parts” means parts by weight.
[0026]
Example 1
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 300 g, hydrogenated dimer acid ("Pripol 1010" manufactured by Unichema, acid value 192.6 KOH mg / g) 87.5 g, tetraisopropyl titanate (hereinafter referred to as TPT) 80 mg as a catalyst, and reaction water In the presence of a small amount of xylene as a discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 16 hours to obtain a polyester having a weight average molecular weight of 28,000.
[0027]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 3 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane ["Colonate HL" manufactured by Nippon Polyurethane Co., Ltd.] as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was coated on a polyethylene terephthalate film (hereinafter referred to as PET film) having a thickness of 38 μm by an applicator, and then dried at 130 ° C. for 5 minutes, from the pressure-sensitive adhesive composition having a thickness of 50 μm. A layer was formed. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0028]
Example 2
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 320 g, hydrogenated dimer diol [“PESPOL HP-1000” manufactured by Toa Gosei Co., Ltd., hydroxyl value: 200 KOH mg / g] 80 g, sebacic acid 61.2 g, TPT 80 mg as catalyst, charged with reaction water In the presence of a small amount of xylene as a discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 24 hours to obtain a polyester having a weight average molecular weight of 49,000.
[0029]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane (“Coronate L” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, It was set as the adhesive composition. This was coated on a PET film having a thickness of 38 μm by an applicator and then dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0030]
Example 3
A four-necked separable flask was equipped with a stirrer, thermometer and water separation tube. Polycarbonate diol ("PLACCEL CD210PL" manufactured by Daicel Chemical Industries, hydroxyl value: 115 KOHmg / g) 320 g 80 g of an ester compound of hydrogenated dimer acid and hexanediol [“PESPOL 601” manufactured by Toagosei Co., Ltd., hydroxyl value: 53.3 KOH mg / g], 74.8 g of sebacic acid, 80 mg of TPT as a catalyst In the presence of a small amount of xylene as a reaction water discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 25 hours to obtain a polyester having a weight average molecular weight of 72,000.
[0031]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane (“Coronate HL” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0032]
Example 4
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 320 g, ester compound of hydrogenated dimer acid and hydrogenated dimer diol [“PESPOL 801” manufactured by Toagosei Co., Ltd., hydroxyl value: 52.7 KOHmg / g] 80 g, azelaic acid 36. 4 g of TPT (80 mg) was charged as a catalyst, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 25 hours to obtain a polyester having a weight average molecular weight of 76,000.
[0033]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane (“Coronate HL” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0034]
Example 5
A four-neck separable flask was equipped with a stirrer, a thermometer and a condenser. Polycarbonate diol ("PLACCEL CD210PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 115 KOHmg / g) 200 g, water 200 g of ester compound of dimer acid and hexanediol [“PESPOL 601” manufactured by Toa Gosei Co., Ltd., hydroxyl value: 53.3 KOH mg / g], 75 g of diphenylmethane diisocyanate, 100 g of toluene Then, 80 mg of TPT was charged as a catalyst, the temperature was raised to 100 ° C., and the reaction was continued for about 8 hours to obtain a polyurethane having a weight average molecular weight of 26,000.
[0035]
This polyurethane was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyurethane was added 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane ("Colone L" manufactured by Nippon Polyurethane Co., Ltd.) as a cross-linking agent. It was set as the adhesive composition. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0036]
Comparative Example 1
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) 300 g, 30 g of sebacic acid, 80 mg of TPT as a catalyst were added, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 16 hours to obtain a polyester having a weight average molecular weight of 37,000.
[0037]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 3 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane ["Colonate HL" manufactured by Nippon Polyurethane Co., Ltd.] as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0038]
Comparative Example 2
A four-necked separable flask was equipped with a stirrer, a thermometer and a water separation tube. Hydrogenated dimer diol ["Pespoor HP-1000" manufactured by Toa Gosei Co., Ltd., hydroxyl value: 200 KOHmg / g] 300 g, 109 g of sebacic acid, 80 mg of TPT as a catalyst were charged, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 24 hours to obtain a polyester having a weight average molecular weight of 29,000.
[0039]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane (“Coronate L” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, It was set as the adhesive composition. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0040]
For each of the adhesive tapes of Examples 1 to 5 and Comparative Examples 1 and 2, the initial adhesive force, the adhesive force, and the release force of the release liner were measured in the following manner. These results were as shown in Table 1 below.
[0041]
<Measurement of initial adhesive strength>
As the adherend, an aluminum plate and an acrylic (polymethyl methacrylate) plate were used, and an adhesive tape (20 mm × 100 mm) was pasted with a 200 g roller, and then the ambient temperature was 23 ° C. and the pasting time was 10 seconds. The 180 ° peel adhesion was measured with a universal tensile tester under the condition of a peel speed of 300 mm / min.
[0042]
<Measurement of adhesive strength>
Using an aluminum plate and an acrylic (polymethylmethacrylate) plate as the adherend, affixing an adhesive tape (20 mm x 100 mm) with a 2 kg roller, an ambient temperature of 23 ° C and a pasting time of 30 minutes The 180 ° peel adhesion was measured with a universal tensile tester under the condition of a peel speed of 300 mm / min.
[0043]
<Measurement of peeling force of peeling liner>
The peeling force of the peeling liner bonded to the adhesive surface was measured with a universal tensile tester under the conditions of an atmospheric temperature of 23 ° C., a peeling angle of 180 °, and a peeling speed of 300 mm / min.
[0044]

[0045]
As is clear from the results of Table 1 above, each of the adhesive tapes of Examples 1 to 5 of the present invention is excellent in adhesive strength and peelability of the release liner, as well as in initial tackiness. I understand that. On the other hand, the adhesive tape of Comparative Example 1 is excellent in the adhesive strength and the peelability of the release liner, but is inferior in the initial adhesiveness. In the adhesive tape of Comparative Example 2, Although it has excellent initial tackiness, the tackiness is somewhat low, and the peelability of the release liner is inferior.
[0046]
【The invention's effect】
As described above, the present invention is mainly composed of a condensed polymer having a specific polycarbonate structure and a cyclic or acyclic specific dioil or diol structure as a main component. In addition, it is possible to provide a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet with improved initial adhesiveness as well as excellent release properties of a release liner that is large and not subjected to silicon treatment. In addition to electronic equipment applications that do not like the presence of silicon, it can be sufficiently used for high-speed continuous bonding operations that require instantaneous bonding or applications that are stressed immediately after bonding.

Claims (5)

a) The following formula (A);
-(O-R-O-C) n-
‖… (A)
O
(R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms)
And b) the following formula (B1);
-C-R ¹ -C-
‖ ‖… (B1)
O O
(R ¹ is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms)
Or the following formula (B2):
—O—R ² —O— (B2)
(R ² is a C36 cyclic or acyclic saturated hydrocarbon group)
A pressure-sensitive adhesive composition comprising a condensation polymer having at least one of the structures represented by:   The structure represented by the formula (B1) is derived from a hydrogenated dimer acid obtained by hydrogenating a dimer acid of an unsaturated fatty acid having 18 carbon atoms, and the structure represented by the formula (B2) 2. The pressure-sensitive adhesive composition according to claim 1, which is derived from a hydrogenated dimer diol obtained by reducing an additive dimer acid. A pressure-sensitive adhesive sheet or tape comprising a layer comprising the pressure-sensitive adhesive composition according to claim 1 or 2 on one side or both sides of a support. 4. The adhesive sheet or tape according to claim 3, wherein a release liner that has not been subjected to a silicone treatment is bonded to the adhesive surface. The pressure-sensitive adhesive sheet or tape according to claim 4, wherein the release liner not subjected to silicone treatment is a polyolefin-based film made of polyethylene, polypropylene, polymethylpentene, ethylene-propylene copolymer or the like.