Adhesive rubber composition

Abstract

To provide an adhesive rubber composition which has balanced adhesive properties with adequate tackiness (initial adhesiveness), adhesive force and retentivity (retention force and cohesive force), and is applicable as an adhesive.SOLUTION: An adhesive rubber composition contains, with respect to 100 pts.wt. of a diene-based rubber, 70-130 pts.wt. of a C5-dicyclopentadiene copolymer resin and 5-50 pts.wt. of process oil.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a pressure-sensitive rubber composition containing a diene rubber, a C5-dicyclopentadiene copolymer resin, and a process oil, and particularly relates to a pressure-sensitive rubber composition having excellent balance of appropriate tack (initial adhesiveness), adhesive force, and holding property (holding force, cohesive force), and capable of being applied as an adhesive.

Background Art

[0002] An adhesive can adhere by applying only a slight pressure at room temperature for a short time without using water, a solvent, heat, etc. General adhesives are applied to plastic films, cellophane, paper, cloth, etc., and processed into various pressure-sensitive products such as pressure-sensitive tapes, pressure-sensitive labels, and pressure-sensitive sheets for use.

[0003] As these adhesives, pressure-sensitive compositions composed of various diene rubbers blended with tackifiers, crosslinking agents, stabilizers, plasticizers, etc. as necessary are known, and petroleum resins are known as tackifiers.

[0004] And the petroleum resin at this time is obtained by polymerizing an unsaturated hydrocarbon-containing fraction obtained during the decomposition and purification of petroleum. As its production method, a method of polymerizing an unsaturated hydrocarbon-containing fraction as a raw material in the presence of a Friedel-Crafts type catalyst is well known. As the hydrocarbon-containing fraction, two types with a boiling range of 20 to 110 °C (sometimes referred to as the C5 fraction) and a boiling range of 140 to 280 °C (sometimes referred to as the C9 fraction) are common. The petroleum resin obtained from the C5 fraction is classified as an aliphatic petroleum resin, the petroleum resin obtained from the C9 fraction is classified as an aromatic petroleum resin, and the petroleum resin obtained by copolymerizing the C5 fraction and the C9 fraction is classified as an aliphatic-aromatic copolymer petroleum resin. Also, a DCPD polymer obtained by thermally polymerizing dicyclopentadiene etc. (sometimes referred to as DCPD) is sometimes referred to as an alicyclic petroleum resin.

[0005] Among them, a pressure-sensitive adhesive composition containing a styrene-isoprene-styrene type block copolymer and an aliphatic-alicyclic copolymer petroleum resin, an aliphatic-aromatic-dicyclopentadiene copolymer petroleum resin, etc. as a tackifier has been proposed (see, for example, Patent Documents 1 and 2). Further, as a tackifier resin, a solvent-type natural rubber-based pressure-sensitive adhesive containing a terpene resin has been proposed (see, for example, Patent Document 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the pressure-sensitive adhesive compositions proposed in Patent Documents 1 and 2 are those proposed for thermoplastic elastomers as the main base polymer, and no consideration has been given to pressure-sensitive adhesive compositions using diene-based rubbers. In the proposal of Patent Document 3, no consideration has been given to the tackifier resin, particularly petroleum resin, and its effects, and there is room for improvement in the balance of color tone and pressure-sensitive adhesive physical properties as a pressure-sensitive adhesive.

[0008] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a pressure-sensitive adhesive rubber composition having excellent pressure-sensitive adhesiveness with an appropriate balance of tack, adhesive force, and holding property, and a pressure-sensitive adhesive comprising the same.

Means for Solving the Problems

[0009] In order to solve the above problems, the present inventors conducted intensive studies and as a result, found that a rubber composition containing a specific amount of a C5-DCPD copolymer resin and a process oil in a diene rubber exhibits excellent adhesive properties, and thus completed the present invention.

[0010] That is, the present invention relates to a pressure-sensitive adhesive rubber composition characterized by containing 70 to 130 parts by weight of a C5-DCPD copolymer resin and 5 to 50 parts by weight of a process oil with respect to 100 parts by weight of a diene rubber, and an adhesive comprising the same.

[0011] The present invention will be described in detail below.

[0012] The pressure-sensitive adhesive rubber composition of the present invention comprises 70 to 130 parts by weight of a C5-DCPD copolymer resin and 5 to 50 parts by weight of a process oil with respect to 100 parts by weight of a diene rubber.

[0013] The diene rubber constituting the pressure-sensitive adhesive rubber composition of the present invention is not limited as long as it belongs to the category of diene rubbers having a carbon-carbon double bond. For example, natural rubber (sometimes abbreviated as NR), polyisoprene rubber (sometimes abbreviated as IR), polybutadiene rubber (sometimes abbreviated as BR), styrene-butadiene copolymer rubber (sometimes abbreviated as SBR), etc. may be mentioned. These may be used alone or in combination. The production method of the diene rubber is not particularly limited, and it may be an anionic polymerization product or an emulsion polymerization product. Its molecular weight and microstructure are not particularly limited, and it may be end-modified with an amine, amide, silyl, alkoxysilyl, carboxyl, hydroxyl group, etc., or may be epoxidized, and commercially available products can be used.

[0014] The C5-DCPD copolymer resin that constitutes the pressure-sensitive rubber composition of the present invention is a resin obtained by copolymerizing a C5 fraction, which is a fraction with a boiling range of 20 to 110 °C by thermal decomposition of petroleum, and DCPD, which is dicyclopentadiene. Examples of the C5 fraction at this time include fractions with a boiling range of 20 to 110 °C. Examples of the components of the C5 fraction include aliphatic compounds with 4 carbon atoms such as butene, butadiene, and isobutene; chain aliphatic compounds with 5 carbon atoms such as 2-methyl-1-butene, 3-methyl-1-butene, 2-methyl-2-butene, and piperylene; chain aliphatic compounds with 6 carbon atoms such as 1-hexene, 2-hexene, 3-hexene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-methyl-2-pentene, 3-methyl-2-pentene, 4-methyl-2-pentene, 2-ethyl-1-butene, and 2,3-dimethyl-1-butene; cyclic aliphatic compounds with 6 carbon atoms such as methylcyclopentadiene; and chain aliphatic compounds with 7 carbon atoms such as 1-heptene, 2-heptene, 3-heptene, 2-methyl-3-hexene, 4-methyl-2-hexene, and 3,4-dimethyl-2-pentene. Further, as DCPD, not only dicyclopentadiene alone but also a (di)cyclopentadiene fraction, which is a thermal decomposition fraction of petroleum, may be used. For example, it may contain methyldicyclopentadiene, dimethyldicyclopentadiene, cyclopentadiene, or methylcyclopentadiene.

[0015] The C5-DCPD copolymer resin is not excluded from containing a C9 component within a range that does not affect the copolymerization components within the scope of achieving the object of the present invention. However, particularly when it exhibits excellent color tone and a rubber modification effect, especially when expressing adhesive properties, it is preferably one that does not contain, as a component, a fraction with a boiling range of 140 to 280 °C in the thermal decomposition fraction of petroleum (usually referred to as the C9 fraction and the aromatic component fraction).

[0016] As a method for producing the C5-DCPD copolymer resin, any method may be used as long as it can produce the C5-DCPD copolymer resin. For example, a method may be mentioned in which a C5 fraction, DCPD, and a saturated hydrocarbon of the C5 fraction such as n-pentane are used as a solvent, and a polymerization reaction is carried out with a polymerization catalyst. The polymerization catalyst in this case is not particularly limited. For example, aluminum trichloride, aluminum tribromide, boron trifluoride or its complex, etc. Among them, since it has excellent catalytic activity, an alcohol or phenol complex of boron trifluoride such as methanol, propanol, butanol, isobutanol, isopentanol, phenol is selected. Among them, butanol, isobutanol, and isopentanol are more preferable. Further, the complex may be used as it is or may be prepared in-suit immediately before use from boron trifluoride and alcohols or phenols. Furthermore, as the feedstock oil, since a C5-DCPD copolymer resin excellent in softening point and hue can be obtained in particular, it is preferably a feedstock oil obtained by mixing and blending 25 to 70% by weight of the C5 fraction and 75 to 30% by weight of the DCPD fraction. Further, the polymerization temperature is not particularly limited, and since it has high polymerization activity and excellent productivity, 20 to 80°C is preferable, and particularly 30 to 60°C is preferable. Also, the amount of the polymerization catalyst, the polymerization time, etc. can be appropriately selected depending on the temperature and the moisture concentration in the feedstock oil. Usually, for example, 0.1 to 2.0% by weight of the polymerization catalyst and 0.1 to 10 hours of the polymerization time are preferable with respect to the feedstock oil. The reaction pressure is not particularly limited, and atmospheric pressure to 1 MPa is preferable. The atmosphere is not particularly limited, and a nitrogen atmosphere is particularly preferable.

[0017] Further, as the C5-DCPD copolymer resin, since it becomes a pressure-sensitive rubber composition particularly excellent in tack and holding power characteristics, it is preferable that the area of double-bonded hydrogen in the peak area measured by a proton nuclear magnetic resonance spectrometer is 6 to 13%, and particularly preferably has 8 to 11%. The proton nuclear magnetic resonance spectrum in this case can be measured, for example, with a 400 MHz proton nuclear magnetic resonance spectrometer.

[0018] And, since it becomes a pressure-sensitive adhesive rubber composition particularly excellent in adhesive performance, color tone, and thermal stability, the olefinic double bond / dicyclopentadiene residue double bond (area ratio) in the proton nuclear magnetic resonance spectrum is preferably 30 / 70 to 75 / 25, particularly preferably one having 40 / 60 to 60 / 40. Using standard polystyrene as a standard substance, in accordance with JIS K-0124 (2011), the weight average molecular weight measured by gel permeation chromatography is preferably 1200 to 2500, particularly preferably within the range of 1600 to 2100. Further, the weight average molecular weight / number average molecular weight is preferably 1.5 to 2.5, particularly preferably one having 1.7 to 2.2. Further, the bromine value measured in accordance with JIS K-2605 (1996) is preferably 40 to 55 (g-Br2 / 100g), and the softening point measured in accordance with JIS K-2207 (1996) (ring and ball method) is preferably 80 to 125 °C.

[0019] Furthermore, since it becomes a pressure-sensitive adhesive rubber composition excellent in appearance, as a 50% by weight toluene solution, the hue (Gardner hue) measured in accordance with ASTM D-1544-63T is preferably 4 to 9.

[0020] The pressure-sensitive adhesive rubber composition of the present invention contains 70 to 130 parts by weight of a C5-DCPD copolymer resin with respect to 100 parts by weight of a diene rubber. Here, when the C5-DCPD copolymer resin is less than 70 parts by weight, the resulting composition has a high adhesive holding force and is inferior in performance as an adhesive. On the other hand, when the C5-DCPD copolymer resin exceeds 130 parts by weight, the resulting composition is inferior in the balance between tack and holding force.

[0021] As the process oil constituting the pressure-sensitive rubber composition of the present invention, any process oil belonging to the category known as process oil can be used. For example, paraffinic process oil, naphthenic process oil, aromatic process oil, liquid polybutene, modified liquid polybutene, hydrocarbon-based synthetic lubricants such as ethylene-α olefin copolymer, etc. can be mentioned. Among these process oils, paraffinic process oil, naphthenic process oil, and aromatic process oil are preferred because they result in a pressure-sensitive rubber composition with better balance, and naphthenic process oil is particularly preferred.

[0022] Specific examples of paraffinic process oils include (trade name) Diana Process Oil PW-32, PW-90, PW-150, PW-380, PS-32, PS-90, PS-380, PS-430, PX-32, PX-90 (manufactured by Idemitsu Kosan Co., Ltd.), (trade name) Stanol 40, 43N, 52, 69, 149, LP40, LP69, Flexon 845 (manufactured by Esso Petroleum Co., Ltd.), (trade name) Sintac PA-95, PA-100, PA-140 (manufactured by Kobe Oil Chemical Industry Co., Ltd.), (trade name) Cosmo Process 10, 40, 40C (manufactured by Cosmo Oil Co., Ltd.), (trade name) Rubflex 26, 100, 400 (manufactured by Shell Japan Ltd.), (trade name) Kyoseki Process P-200, P-300, P-500 (manufactured by Nippon Mining Kyoseki Co., Ltd.), etc. Specific examples of naphthenic process oils include (trade name) Diana Process Oil NS-24, NS-100, NM-26, NM-68, NM-150, NM-280, NP-24, NU-80, NF-90 (manufactured by Idemitsu Kosan Co., Ltd.), (trade name) Esso Process Oil 725, 765 (manufactured by Esso Petroleum Co., Ltd.), (trade name) Sintac N-40, N-60, N-70, N-75, N-85 (manufactured by Kobe Oil Chemical Industry Co., Ltd.), (trade name) Shellflex 371JY, 371N, 451, N-40, 22, 22R, 32R, 100R, 100S, 100SA, 220RS, 220S, 260, 320R, 680 (manufactured by Shell Japan Ltd.), (trade name) Kyoseki Process R-50, R-200, R-1000 (manufactured by Nippon Mining Kyoseki Co., Ltd.), etc. Examples of aromatic process oils include (trade name) Diana Process Oil AC-12, AC-460, AE-24, AE-50, AE-200, AH-16, AH-58 (manufactured by Idemitsu Kosan Co., Ltd.), (trade name) Esso Process Oil 110, 120 (manufactured by Esso Petroleum Co., Ltd.), (trade name) Sintac HA-10, HA-15, HA-30, HA-35 (manufactured by Kobe Oil Chemical Industry Co., Ltd.), (trade name) Cosmo Process 40A (manufactured by Cosmo Oil Co., Ltd.), (trade name) Dutrex 729UK, 739 (manufactured by Shell Japan Ltd.), (trade name) Kyoseki Process X100-A, X100 (manufactured by Nippon Mining Kyoseki Co., Ltd.), etc.

[0023] The pressure-sensitive rubber composition of the present invention contains 5 to 50 parts by weight of process oil with respect to 100 parts by weight of diene rubber. Here, when the process oil is less than 5 parts by weight, the resulting composition will be inferior in plasticity and lack tack. On the other hand, when it exceeds 50 parts by weight, the resulting composition will be over-plasticized and inferior in adhesive strength and holding power.

[0024] Furthermore, since the pressure-sensitive rubber composition of the present invention imparts heat durability, it is preferable to compound an antioxidant. The compounding amount at that time is preferably 2 parts by weight or less, particularly preferably 1 part by weight or less, with respect to 100 parts by weight of diene rubber. Specific antioxidants are not particularly limited as long as they are generally used as antioxidants in the field of adhesives. For example, (trade name) Irganox 1010 can be mentioned.

[0025] The pressure-sensitive rubber composition of the present invention has good tack, adhesive strength, and holding power, and is also excellent in their balance. Specifically, it is preferable that the tack measured in accordance with JIS Z-0237 has 7 ball No or more, and particularly preferably 9 ball No or more. Also, the adhesive strength measured in accordance with JIS Z-0237 is preferably 10 N / 25 mm or more, and particularly preferably 13 N / 25 mm or more. Furthermore, the holding power measured in accordance with JIS Z-0237 is preferably 150 minutes or more, and particularly preferably 200 minutes or more.

[0026] The manufacturing method of the pressure-sensitive rubber composition of the present invention is not particularly limited as long as the pressure-sensitive rubber composition can be obtained. For example, a method of charging each compounding component into a blade mixer equipped with a blade having an appropriate shape for kneading and heating and kneading to manufacture; a method of continuously manufacturing using an extruder-type kneader equipped with a single-screw or twin-screw, etc. can be mentioned. Also, each compounding component can be stirred and mixed in the presence of a solvent such as toluene to form an adhesive solution, and furthermore, a hydrocarbon resin pre-emulsified in rubber latex can be stirred and mixed to form an adhesive emulsion.

[0027] The pressure-sensitive rubber composition of the present invention has excellent adhesiveness with a balance of tack, adhesive force, and holding power, can be used as an excellent adhesive, and can be applied to a desired base material such as a tape, label, or sheet using a coater to produce various pressure-sensitive tapes, pressure-sensitive labels, pressure-sensitive sheets, and the like.

Effect of the Invention

[0028] According to the present invention, it is possible to provide an adhesive having excellent adhesiveness with a balance of tack, adhesive force, and holding power.

Examples

[0029] The present invention will be described below with reference to examples, but the present invention is not limited by these examples. The analysis and test methods used in the examples and comparative examples are as follows.

[0030] The analysis method of the C5-DCPD copolymer resin is shown below.

[0031] ~Proton NMR (nuclear magnetic resonance spectrum) measurement~ The C5-DCPD copolymer resin was dissolved in chloroform-d (manufactured by Wako Pure Chemical Industries, Ltd.) and measured by a normal NMR measurement method. For the obtained spectrum, the area ratio was determined based on the following calculation formula. Double-bond hydrogen area (%) = (double-bond hydrogen peak area) / (total of all peak areas) × 100 Olefinic double bond (area ratio) = (olefinic double-bond hydrogen peak area) / (total of olefinic and DCPD residue double-bonded hydrogen peak areas) × 100 DCPD residue double bond (area ratio) = (DCPD double-bonded hydrogen peak area) / (total of olefinic and DCPD residue double-bonded hydrogen peak areas) × 100 Each peak is as follows. Double-bond hydrogen peak: 4.4 to 6.3 ppm. Olefinic double-bond peak: 4.4 to 5.2 ppm. DCPD residue double bond peak: 5.3 - 5.5 ppm.

[0032] ~Measurement of number average molecular weight (Mn) and weight average molecular weight (Mw)~ Using polystyrene as the standard substance, it was measured by gel permeation chromatography in accordance with JIS K - 0124 (2011).

[0033] ~Measurement of bromine number~ It was measured by a method in accordance with JIS K - 2605 (1996).

[0034] ~Measurement of softening point~ It was measured by a method in accordance with JIS K - 2207 (1996) (ring and ball method).

[0035] ~Measurement of hue~ As a 50 wt% toluene solution, it was measured in accordance with ASTM D - 1544 - 63T.

[0036] The evaluation method and criteria for the tacky physical properties of the pressure - sensitive rubber composition are shown below.

[0037] ~Tack~ In accordance with JIS Z - 0237, at 23 °C, it was pasted on an inclined surface of a glass plate with an inclination angle of 30 degrees with the adhesive surface of 10 cm in length facing up, and 30 types of steel balls with diameters ranging from 3 / 32 inch to 1 inch were rolled from a position 10 cm above the inclined surface with an initial velocity of 0 and stopped on the adhesive tape. It was expressed by the size of the largest - diameter ball (unit: ball No (= ×1 / 32 inch)).

[0038] ~Adhesive force~ In accordance with JIS Z - 0237, an adhesive tape with a width of 25 mm × length of 100 mm was pasted on a stainless - steel plate, and at 23 °C, it was peeled off in the 180 - degree direction at a speed of 300 mm / min, and the peel force (unit: N / 25 mm) was measured.

[0039] ~Retention force~ In accordance with JIS Z-0237, an adhesive tape was attached to the cardboard so that an area of 25 mm × 25 mm was in contact, and the time (unit: minutes) required for the adhesive tape to fall off from the cardboard when a load of 1 kg was applied at 50°C was measured.

[0040] Synthesis Example 1 In a 2-liter glass autoclave, a feedstock oil composed of 50 wt% of a C5 fraction obtained by the decomposition of naphtha (containing 1.5% of cyclopentadiene) and 50 wt% of a DCPD fraction was prepared and charged. Next, after adjusting the temperature to 40°C under a nitrogen atmosphere, 1.4 parts by weight of boron trifluoride isobutanol complex as a Friedel-Crafts type catalyst was added to 100 parts by weight of the feedstock oil and polymerized for 2 hours. Thereafter, the catalyst was removed with an aqueous sodium hydroxide solution, and the unreacted oil in the oil phase was distilled to obtain a C5-DCPD copolymer resin (referred to as Resin A). The evaluation results are shown in Table 1.

[0041] Synthesis Examples 2 to 4, Synthesis Example 7 A C5-DCPD copolymer resin (referred to as Resins B, C, D, and G) was obtained in the same manner as in Example 1, except that the weight ratio of the feedstock oil composed of a C5 fraction (containing 1.5% of cyclopentadiene) obtained by the decomposition of naphtha and a DCPD fraction was as shown in Tables 1 and 2. The evaluation results are shown in Tables 1 and 2.

[0042] Synthesis Examples 5 to 6, Synthesis Example 8 A C5-DCPD copolymer resin (referred to as Resins E, F, and H) was prepared using a feedstock oil composed of 55 wt% of a C5 fraction and 45 wt% of a DCPD fraction obtained by the decomposition of naphtha, and the cyclopentadiene concentration in the C5 fraction was as shown in Tables 1 and 2. The evaluation results are shown in Tables 1 and 2.

[0043]

Table 1

[0044]

Table 2

[0045] Example 1 To 100 parts by weight of natural rubber (RSS#3, Mooney viscosity ML 1+4 40) as a diene rubber, 100 parts by weight of Resin A, 20 parts by weight of naphthenic process oil ((trade name) Diana Process Oil NS-100, manufactured by Idemitsu Kosan Co., Ltd.), and 1 part by weight of antioxidant ((trade name) Irganox 1010, manufactured by Ciba Specialty Chemicals) were dissolved and mixed in toluene to obtain a sticky rubber composition having a non-volatile content concentration of 23% as a solution.

[0046] The solution of the obtained sticky rubber composition was applied to a polyester film with a thickness of 25 μm so that the adhesive thickness became 35 μm, and the tack (initial adhesive strength), adhesive strength, and holding strength of the sheet were measured. The results are shown in Table 3.

[0047] The obtained sticky rubber composition exhibited excellent balance of tack, adhesive strength, and holding strength.

[0048] Examples 2 to 12 A sticky rubber composition was prepared and evaluated in the same manner as in Example 1, except that the formulation of the sticky rubber composition was as shown in Tables 3 and 4. The results are shown in Tables 3 and 4.

[0049] The obtained sticky composition exhibited excellent balance of tack, adhesive strength, and holding strength.

[0050] [Table 3]

[0051] [Table 4]

[0052] Comparative Examples 1 to 5 The composition was prepared and evaluated in the same manner as in Example 1, except that the formulation of the composition was as shown in Table 5. The results are shown in Table 5. Comparative Example 3 used a commercially available petroleum resin ((trade name) T-REZ RA100, manufactured by ENEOS Corporation; Resin I) instead of Resin A.

[0053]

Table 5

Industrial Applicability

[0054] The pressure-sensitive rubber composition of the present invention is excellent in the balance of tack, adhesive strength, and holding power, can be applied as an adhesive, and is very useful industrially.

Claims

1. Based on 100 parts by weight of the diene rubber, it contains 70 to 130 parts by weight of a C5-dicyclopentadiene copolymer resin and 5 to 50 parts by weight of process oil. The diene rubber is natural rubber, and the C5-dicyclopentadiene copolymer resin is a binary copolymer having a two-component structural unit of a C5 fraction, which is a thermal decomposition fraction of petroleum, and dicyclopentadienes. The dicyclopentadienes are dicyclopentadiene alone or a dicyclopentadiene fraction containing methyldicyclopentadiene, dimethyldicyclopentadiene, cyclopentadiene, and methylcyclopentadiene, which are thermal decomposition fractions of petroleum. It is a tacky rubber composition characterized by this.

2. The tacky rubber composition according to claim 1, wherein the C5-dicyclopentadiene copolymer resin is a C5-dicyclopentadiene copolymer resin that satisfies any of the following characteristics (1) to (5). (1) The area of double-bonded hydrogen in the peak area measured by a proton nuclear magnetic resonance spectrometer is 6 to 13%, and the olefinic double bond / dicyclopentadiene residue double bond (area ratio) is 30 / 70 to 75 / 25. (2) Using standard polystyrene as a standard substance, in accordance with JIS K-0124 (2011), the weight average molecular weight measured by gel permeation chromatography is 1200 to 2500, and the weight average molecular weight / number average molecular weight is 1.5 to 2.

5. (3) The bromine value measured in accordance with JIS K-2605 (1996) is 40 to 55 (g-Br ２ / 100 g). (4) The softening point measured in accordance with JIS K-2207 (1996) (ring and ball method) is 80 to 125 °C. (5) As a 50% by weight toluene solution, the Gardner color measured in accordance with ASTM D-1544-63T is 4 to 9.

3. The tacky rubber composition according to claim 1 or 2, wherein the C5-dicyclopentadiene copolymer resin is a polymerization catalyst type copolymer.

4. An adhesive characterized by comprising the tacky rubber composition according to any one of claims 1 to 3.

5. The adhesive according to claim 4, further characterized in that it is a solution type containing a solvent.

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