KR20130046971A - Doble sided adhesive tape for fixing touch screen - Google Patents

Abstract

PURPOSE: An adhesive tape for double sides for fixing a touch screen is provided to have a stable adhesive performance, high durability, and excellent reliability. CONSTITUTION: An adhesive tape for double sides comprises an olefin-based foam substrate and an adhesive layer including an acrylic resin. The adhesive layer is formed on double sides of the olefin-based foam substrate. The thickness of the olefin-based foam substrate is 100-1,000 micron. The compressive strength of the olefin-based foam substrate is 120-400 kPA at 50% compression. The tensile strength of the olefin-based foam substrate is 2,000-9,000 kPa and the elongation is 200-400%. The acrylic resin contains a crosslinkable functional group-containing monomer or a monomer represented by chemical formula 1.

Description

Double-sided adhesive tape for fixing the touch screen {DOBLE SIDED ADHESIVE TAPE FOR FIXING TOUCH SCREEN}

The present invention relates to a double-sided adhesive tape for fixing a touch screen having an acrylic adhesive layer to which a terpene tackifier is added on an olefinic foam substrate.

Recently, PDAs, mobile communication terminals or car navigation systems are forming a large market. Such electronic devices require continuous technology development for thinning, light weight, low power consumption, high resolution, and high brightness.

In particular, the touch screen to be applied to an electronic device in which a touch screen or a touch panel switch is installed in the input operation unit is changing from a resistive film type to a capacitive glass type. Attached. In addition, the main body of the electronic device is introduced not only various plastics but also metal materials, and the upper surface of the LCD panel part is subjected to various surface treatments to improve visibility as well as polarizing plates.

In this field, the double-sided adhesive tape is required to attach the surfaces of different materials, and the reality is that an adhesive layer is introduced on both sides of a rigid film such as PET. There is a problem that the touch screen and the main body of the apparatus or the LCD panel are separated from each other when an electronic device using a rigid film such as PET is impacted from the outside.

As touch screen is changed from light film form to heavy tempered glass, impact resistance needs to be improved, and stable adhesion performance is gradually required regardless of the type of adherend. The double-sided adhesive tape to be used in electronic devices has a very thin line width of 2 mm or less for attaching the upper and lower parts, and adhesion performance is important, but stability is also important under practical durability and reliability conditions.

According to such a request, Nitto Denko Co., Ltd. double-sided adhesive tape has a pressure-sensitive adhesive layer on both sides of the foam base material and has a total thickness of 250 microns or less. In particular, this double-sided adhesive tape uses 30 weight part of rosin esters as a tackifier of an adhesive layer (patent document 1).

In addition, the double-sided adhesive tape which Daishi Kabushiki Kaisha applied for discloses the acrylic adhesive composition containing the acrylic copolymer which has a predetermined composition, and a polymeric rosin ester tackifier (patent document 2).

Patent Document 1 and Patent Document 2 described above are provided with a pressure-sensitive adhesive layer on both sides of the foam base material, not only can provide water resistance, impact resistance and followability according to the properties of the foam, but also the pressure-sensitive adhesive layer is a rosin ester-based adhesive to the acrylic copolymer Adhesion performance may be excellent by adding the imparting agent, but there is a problem that substantially does not guarantee the reliability of durability.

[Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2010-155969

Patent Document 2: Japanese Patent Laid-Open No. 2010-260880

The present invention was created to overcome the problems shown in the double-sided adhesive tape according to the prior art, and an object thereof is to provide a double-sided adhesive tape for fixing a durable touch screen.

In order to achieve the above object, the double-sided adhesive tape of the present invention is an olefin-based foam base; And an adhesive layer including an acrylic resin, wherein the adhesive layer is formed on both sides of the olefinic foam base material.

The double-sided adhesive tape according to the present invention has a stable adhesion performance and at the same time has a high durability bar has an effect of excellent reliability.

1 is a cross-sectional view of the double-sided adhesive tape for fixing the touch screen according to the present invention.
2 is a flow chart schematically showing a method of manufacturing a double-sided adhesive tape according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Double sided adhesive tape

Hereinafter, a double-sided adhesive tape for fixing a touch screen of the present invention will be described in detail with reference to FIG. 1. The double-sided adhesive tape 100 of the present invention includes an adhesive layer 20 including an olefinic foam base 10 and an acrylic resin.

Olefin Foam  materials

Double-sided adhesive tape 100 of the present invention is characterized in that it comprises an olefin-based foam base (10).

The urethane-based foam substrate used in the prior art has a disadvantage in that chemical resistance and waterproof performance are poor because the foam form of the foam is an open cell.

In accordance with the JIS K6767 measuring method, the olefinic foam base material 10 of the present invention preferably has a compressive strength of 50% and 120 to 400 kPa upon compression, a tensile strength of 2000 to 9000 kPa, and an elongation of 200 to 400%. Do. When the compressive strength, tensile strength, and elongation of the olefinic foam base material 10 of the present invention are out of the above ranges, the shock-absorbing properties are insufficient, which is not suitable for the present invention.

The olefinic foam base material 10 of the present invention is preferably a crosslinked polyolefin foam having a foaming ratio of 2 to 15 times and a thickness of 0.1 to 1.0 mm. When the thickness of the olefinic foam base material 10 is less than the above range, the adhesion performance and workability are remarkably inferior, whereas when the thickness of the olefinic foam base 10 is exceeded, the waterproof property is lowered and the mechanical strength is weakened.

There is no restriction | limiting in particular as polyolefin resin which comprises the foam of the olefinic foam base material 10 of this invention, For example, polyethylene resin or polypropylene resin is preferable.

Adhesive layer

The adhesive layer 20 of the present invention is laminated on both flat surfaces of the aforementioned olefinic foam substrate 10 as shown in FIG.

The base resin constituting the pressure-sensitive adhesive layer 20 of the present invention is an acrylic resin, and the weight average molecular weight (Mw) of the acrylic resin is not particularly limited, but is preferably 500,000 to 2 million. If the weight average molecular weight is less than 500,000, the cohesive force of the pressure-sensitive adhesive is low, durability reliability may be a problem, if the weight average molecular weight exceeds 2 million, the wettability to the adherend is deteriorated due to the decrease in adhesive properties, This is because there is a possibility that problems such as lifting or bubble inflow caused.

Although the composition of the said acrylic resin is not specifically limited, (meth) acrylic acid ester monomer; And it may include a crosslinkable functional group-containing monomer or a monomer represented by the following formula (1).

[Formula 1]

First, the type of the (meth) acrylic acid ester monomer is not particularly limited, but when the alkyl group included in the monomer becomes too long, the cohesive force of the adhesive layer is lowered, and the glass transition temperature (Tg) and the adhesiveness are controlled. Since it will become difficult, it is preferable to use the (meth) acrylic acid ester monomer which has a C1-C12 alkyl group.

Such monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) ) Acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n-octyl (meth) acrylate, iso It may be used selected from the group consisting of octyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, and tetradecyl (meth) acrylate or by mixing one or more of the above groups Can be used.

At this time, the (meth) acrylic acid ester monomer is preferably included in an amount of 90 to 99.9 parts by weight relative to 100 parts by weight of acrylic resin, but if the content is less than 90 parts by weight, there is a risk that the initial adhesive strength of the pressure-sensitive adhesive is lowered, When it exceeds 99.9 weight part, there exists a possibility that a problem may arise in durability due to the fall of cohesion force.

Herein, the term "parts by weight" refers to the ratio of the weight of a comparative substance to the weight of one substance, which is a reference, as a relative numerical concept.

On the other hand, the type of the crosslinkable functional group-containing monomer that can be used in the present invention is not particularly limited, but one or more kinds of carboxyl group-containing monomer, hydroxy group-containing monomer or nitrogen-containing monomer can be used.

The carboxyl group-containing monomers include, for example, (meth) acrylic acid, 2- (meth) acryloyloxy acetic acid, 3- (meth) acryloyloxy propyl acid, 4- (meth) acryloyloxy butyl acid, acrylic acid duplexes, Itaconic acid, fumaric acid, maleic acid and maleic anhydride can be used, and the hydroxy group containing monomers are, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) It can be acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate And the nitrogen-containing monomer may be, for example, (meth) acrylamide, N-vinyl pyrrolidone or N-vinyl caprolactam, but is not limited to the compositions described in the description.

The crosslinkable functional group-containing monomer contained in the acrylic resin imparts cohesion and adhesive strength to the adhesive layer, and serves to improve durability in high temperature and / or high humidity conditions.

Here, the crosslinkable functional group-containing monomer is preferably included in an amount of 0.1 to 10 parts by weight relative to 100 parts by weight of the acrylic resin, but if the content is less than 0.1 parts by weight, cohesive failure occurs under high temperature and / or high humidity conditions. There exists a possibility that durability durability may fall, and when it exceeds 10 weight part, there exists a possibility that a flow characteristic may fall because of a compatibility fall.

On the other hand, the monomer represented by the following formula (1) that can be used in the present invention may be added for the purpose of imparting the adhesive force and cohesive force to the acrylic resin, the control of the glass transition temperature and other functional provision.

[Formula 1]

Wherein R 1 to R 3 each independently represent hydrogen or alkyl, R 4 represents cyano, phenyl, acetyloxy or COR 5 unsubstituted or substituted with alkyl, wherein R 5 is unsubstituted or substituted with alkyl or alkoxyalkyl. Amino or glycidyloxy.

Alkyl or alkoxy in the definition of R1 to R5 means alkyl or alkoxy having 1 to 8 carbon atoms, preferably methyl, ethyl, methoxy, ethoxy, propoxy or butoxy.

Monomers represented by the formula (1) include, for example, nitrogen-containing monomers such as (meth) acrylonitrile, (meth) acrylamide, N-methyl (meth) acrylamide or N-butoxy methyl (meth) acrylamide; Styrene-based monomers such as styrene or methyl styrene; Acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate or glycidyl (meth) acrylate; Or selected from the group consisting of carboxylic acid vinyl esters such as vinyl acetate, or may be used by mixing one or more of the above groups. As is well known to those skilled in the art, it is not limited to the monomers described above.

When such a monomer is contained in acrylic resin, it is preferable that the content is 20 weight part or less with respect to 100 weight part of acrylic resin. If the content exceeds 20 parts by weight, there is a fear that the flexibility and / or peeling force of the pressure-sensitive adhesive layer composition is lowered.

On the other hand, the pressure-sensitive adhesive layer 20 containing the acrylic resin of the present invention is characterized in that it further comprises a terpene-based tackifier.

The tackifier functions to control the adhesive performance of the pressure-sensitive adhesive layer 20 containing the acrylic resin of the present invention. In the present invention, in particular, a softener having a softening point of 140 ° C. or higher as a terpene tackifier is used alone or in combination. It can mix and use the above.

If the softening point of the terpene-based tackifier of the present invention is less than 140 ℃ satisfies the durability reliability, it is preferable to use a softening point of 140 ℃ or more, specific examples of the SP-560, Arizona Chemical of SI Group SYLVARES TP 7042 Resin.

It is preferable that the said terpene-type tackifier is contained 5-50 weight part with respect to 100 weight part of acrylic resin of this invention. If the content is less than 5 parts by weight, the effect of improving the durability is insufficient, and if more than 50 parts by weight of the cloudy turbidity occurs, there is a possibility that the adhesive performance is lowered.

Meanwhile, the adhesive layer 20 including the acrylic resin of the present invention may further include a crosslinking agent. The crosslinking agent reacts with the crosslinkable functional group-containing monomer included in the base resin to increase the cohesive force of the pressure-sensitive adhesive to play a role of adjusting the adhesive properties.

Specific examples of the crosslinking agent include, but are not limited to, a general crosslinking agent such as an isocyanate compound, an epoxy compound, an aziridine compound, and a metal chelate compound.

The isocyanate compound is tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoform diisocyanate, tetramethylxylene diisocyanate, naphthalene diisocyanate and any one of the above polyols (ex. Trimethyl One or more selected from the group consisting of reactants with roll propane).

In addition, the epoxy compound is ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'- tetraglycidyl ethylenediamine and glycerin diglycidyl It may consist of one or more selected from the group consisting of ethers.

In addition, the aziridine-based compound is N, N'-toluene-2,4-bis (1-aziridinecarboxamide), N, N'-diphenyl methane-4,4'-bis (1-aziridinecar Radiamide), triethylene melamine, bisisoprotaloyl-1- (2-methylaziridine), and tri-1-aziridinylphosphineoxide.

The metal chelate compound may be a compound in which a polyvalent metal such as aluminum, iron, zinc, tin, titanium, antimony, magnesium, and / or vanadium is coordinated with acetyl acetone or ethyl acetoacetate, and the like, but is not limited thereto. .

Here, the content of the crosslinking agent is preferably included 0.01 to 10 parts by weight based on 100 parts by weight with respect to 100 parts by weight of acrylic resin. If it is less than 0.01 weight part, there exists a possibility that the cohesion force of an adhesive may fall, and when it exceeds 10 weight part, there exists a possibility that an interlayer peeling and a lifting phenomenon may arise by wettability fall.

On the other hand, the pressure-sensitive adhesive layer 20 of the present invention has a tackifying resin, a low molecular weight, an epoxy resin, a curing agent, an ultraviolet stabilizer, an antioxidant, a colorant, a reinforcing agent, an antifoaming agent, a surfactant, a plasticizer within a range that does not affect the effect of the invention. And one or more additives selected from the group consisting of blowing agents and organic salts.

The adhesive layer 20 of the present invention comprising the above components preferably has a crosslinking density of 40% to 97%, more preferably 60% to 97% after curing. If the crosslinking density after curing is less than 40%, the cohesion force of the pressure-sensitive adhesive may be lowered. If the crosslinking density is more than 97%, the durability may be lowered, such as a lifting phenomenon due to a decrease in wettability to the adherend.

Manufacturing method of double sided adhesive tape

2 is a flowchart schematically showing a method for producing a double-sided pressure-sensitive adhesive tape according to the present invention.

As shown, the method of manufacturing a double-sided adhesive tape according to the present invention comprises the steps of forming an adhesive layer containing an acrylic resin on a release film or release paper (S100); Performing a corona treatment on both surfaces of the olefinic foam substrate (S200); And forming the adhesive layers on both surfaces of the olefinic foam substrate (S300).

First, in the step (S100) of forming an adhesive layer containing an acrylic resin on a release film or a release paper, the adhesive composition containing the acrylic resin described above is applied onto a release film and cured to form an adhesive layer.

For example, the adhesive composition is applied to a release film by means of a bar coater or the like, and dried and cured. Moreover, after apply | coating an adhesive composition on the surface of a peelable base material first, and drying it, the method etc. which transfer an adhesive layer to a base film using a peelable base material, and age and harden can be used.

The adhesive layer has a thickness of 5 μm to 100 μm, preferably 10 μm to 70 μm in consideration of the formation of a uniform adhesive layer on a release film and the nonuniformity of physical properties of the adhesive film.

The adhesive composition applied on the release film may be prepared through a general polymerization method such as photopolymerization, bulk polymerization, suspension polymerization or emulsion polymerization. In the present invention, it is particularly preferable to use a solution polymerization method, and solution polymerization is preferably carried out at a polymerization temperature of 50 to 140 ° C by mixing an initiator in a state where each monomer is uniformly mixed.

Examples of initiators that may be used herein include azo polymerization initiators such as azobis isobutyronitrile or azobiscyclohexane carbonitrile; And / or conventional initiators such as peroxides such as benzoyl peroxide or acetyl peroxide, and one or a mixture of two or more of them may be used.

The acrylic pressure-sensitive adhesive composition thus prepared undergoes curing by providing heat or active energy rays (for example, ultraviolet rays or electron beams).

Here, when the adhesive composition of this invention contains a crosslinking agent, the said crosslinking agent controls so that the crosslinking reaction of a functional group may not advance in formation of an adhesive layer. The crosslinking agent forms a crosslinked structure in the drying and aging process after the coating operation to improve cohesion, thereby improving adhesive properties and cuttability of the adhesive product.

Next, the step (S200) of corona treatment on both surfaces of the olefin-based foam substrate is to modify the surface of the substrate of the olefin-based foam substrate 10 to form a surface roughness on the substrate, while removing foreign matter and sticking. Allow layer 20 to form well.

Finally, by forming the adhesive layers on both surfaces of the olefin-based foam substrate (S300) it is possible to manufacture a double-sided adhesive tape.

Comparison of each of the embodiments of the touch screen double-sided adhesive tape according to the present invention, in particular, the composition ratio of the acrylic pressure-sensitive adhesive composition to which the terpene-based tackifier was added on the olefinic foam substrate, and not according to the manufacturing method of the present invention Examples are listed below. Through this comparison, the features and advantages of the present invention will be described. In addition, the present invention is not limited by the examples described below.

Example  And Comparative example

Example  One

Based on 100 parts by weight of the solid content of the acrylic copolymer prepared in step (S100), 0.05 parts by weight of the aziridine-based crosslinking agent and 7 parts by weight of a terpene phenol tackifier having a softening point of 150 ° C. were further added to generate a mixture. Then, the mixture was diluted to an appropriate concentration and uniformly mixed, and then coated and dried on one surface of a release film having a thickness of 50 μm to form an adhesive layer having a thickness of 25 μm. Thereafter, the mixture was stored in an oven at 50 ° C. for 1 day to sufficiently undergo a aging process to prepare an adhesive layer. The pressure-sensitive adhesive layer produced in this step was laminated on both sides of the corona-treated olefinic foam base material (thickness 100 μm) to prepare a double-sided adhesive tape. At this time, the olefinic foam substrate used was 120 kPa compressive strength 50%, tensile strength 2000 kPa, elongation of 200% was used.

In Example 1, the acrylic adhesive composition to be applied on the release film is n-butyl acrylate, vinyl so that the glass transition temperature is -65 ℃ in a 1L reactor equipped with a cooling device to reflux the nitrogen gas and easy temperature control After adding a monomer mixture of acetate and acrylic acid, 100 parts by weight of ethyl acetate (EAc) was added as a solvent. After purging nitrogen gas for 1 hour for oxygen removal, the temperature of the mixture was kept at 55 ° C. 0.05 parts by weight of azobisisobutyronitrile (AIBN) diluted to 50% in ethyl acetate as a reaction initiator was added to the mixture, and reacted for 8 hours to prepare an acrylic resin having a weight average molecular weight of 800,000.

Example  2

The double-sided adhesive tape of Example 2 was prepared in the same manner as in Example 1 except that the thickness of the olefinic foam base material was 200 μm.

Example  3

The double-faced pressure-sensitive adhesive tape of Example 3 was prepared in the same manner as in Example 1, except that 20 parts by weight of a terpene phenol tackifier was used and that the thickness of the adhesive layer was 50 탆.

Example  4

The double-sided adhesive tape of Example 4 was prepared in the same manner as in Example 1 except that the aziridine-based crosslinking agent content was 0.1 parts by weight.

Example  5

The double-sided pressure-sensitive adhesive tape of Example 5 was prepared in the same manner as in Example 1 except that the compressive strength of the olefinic foam substrate was 400 kPa, 50 000% of tensile strength, 9000 kPa, and 400% elongation.

Example  6

The double-sided adhesive tape of Example 6 was prepared in the same manner as in Example 1 except that the thickness of the olefinic foam base material was 1000 μm.

Example  7

The double-sided adhesive tape of Example 7 was prepared in the same manner as in Example 1 except that a terpene phenol tackifier having a softening point of 140 ° C. was used.

Example  8

The double-sided adhesive tape of Example 8 was prepared in the same manner as in Example 1 except that 50 parts by weight of a terpene phenol tackifier was used.

Comparative example  One

Comparative Example 1 was prepared in the same manner as in Example 1 except that no terpene-based tackifier was added.

Comparative example  2

Comparative Example 2 was prepared in the same manner as in Example 1 except that a terpene phenol resin having a softening point of 115 ° C. was used as the terpene tackifier.

Comparative example  3

Comparative Example 3 was prepared in the same manner as in Example 1, except that 20 parts by weight of a rosin ester tackifier was used as a tackifier.

Comparative example  4

Comparative Example 4 was prepared in the same manner as in Example 1, except that 20 parts by weight of a hydrocarbon-based tackifier was used as the tackifier.

Comparative example  5

Comparative Example 5 was prepared in the same manner as in Example 1 except that 60 parts by weight of the terpene-based tackifier was used and the thickness of the adhesive layer was 50 μm.

Comparative example  6

Comparative Example 6 was prepared in the same manner as in Example 1, except that 50 µm PET film was used as the substrate.

Comparative example  7

Comparative Example 7 was prepared in the same manner as in Example 1 except that a 200 μm urethane foam was used as the substrate.

Physical properties of the double-sided pressure-sensitive adhesive tapes of the Examples and Comparative Examples are summarized as shown in Table 1 below.

The pressure-
Thickness (㎛) Foam thickness (μm) Total thickness of double sided adhesive tape (μm) Tackifier Kinds Softening point (℃) Content (parts by weight) Example 1 25 100 150 Terpene 150 7 Example 2 25 200 300 Terpene 150 7 Example 3 50 100 200 Terpene 150 20 Example 4 25 100 150 Terpene 150 7 Example 5 25 100 150 Terpene 150 7 Example 6 25 1000 150 Terpene 150 7 Example 7 25 100 150 Terpene 140 7 Example 8 25 100 150 Terpene 150 50 Comparative Example 1 25 100 150 - - - Comparative Example 2 25 100 150 Terpene 115 7 Comparative Example 3 25 100 150 rosin 110 20 Comparative Example 4 25 100 150 hydrocarbon 80 20 Comparative Example 5 50 100 200 Terpene 150 60 Comparative Example 6 25 PET 50 200 Terpene 150 7 Comparative Example 7 25 PU 200 250 Terpene 150 7

evaluation

180 ° peeling force

After removing the release film on one side of the double-sided adhesive tape according to each Example and Comparative Example and plywood 50㎛, a measurement sample of 20mm in width and 250mm in length was prepared. Each sample was attached to a PC (polycarbonate), PMMA (polymethylmethacrylate), glass, hard-coated PC with a roller of 2 Kg according to JIS Z0237. Then, after storing for 30 minutes under a temperature of 23 ℃ and a relative humidity of 55%, the peel force was measured at a peel rate of 0.3 m / min using a tensile tester and the results are shown in Table 2 below. .

180 ° peeling force (gf / 20mm) PC PMMA Glass Hard Coating PC Example 1 2000 1800 1700 1200 Example 2 2300 1900 1900 1500 Example 3 2500 2200 2300 2000 Example 4 1800 1700 1500 1000 Example 5 2300 2100 1900 1500 Example 6 2200 2000 1900 1400 Example 7 2400 2200 1600 1500 Example 8 2100 2000 1800 1500 Comparative Example 1 1800 1700 1200 800 Comparative Example 2 1900 1800 1600 1000 Comparative Example 3 2000 1900 1800 1500 Comparative Example 4 1700 1600 1200 800 Comparative Example 5 1200 900 1000 800 Comparative Example 6 1700 1400 1600 1000 Comparative Example 7 2100 1800 1700 1300

2. Chemical resistance

The double-sided adhesive tapes prepared according to the examples and the comparative examples were punched out in the shape of a window frame with a width of 40 mm, a length of 60 mm, and a width of 1 mm. The measurement sample was attached to the other side, the release film on the other side was removed, and attached to an acrylic plate (40 mm wide, 60 mm long, 1 mm thick). Then, the measurement sample was immersed in artificial sebum and then stored at 50 degrees for 1 day to observe the appearance of the sample and the results are shown in Table 3 below.

3. Waterproof

After preparing in the same manner as the chemical resistance measurement sample, the appearance after observation for 30 minutes in a water tank of 1m depth was observed, and the results are shown in Table 3 below.

4. Endurance Reliability

The sample produced in the same manner as the peel force measurement sample was observed after storage at a temperature of 85 degrees and 85% relative humidity for 500 hours, and the results are shown in Table 4 below.

Chemical resistance Waterproof Durability Reliability Example 1 Good Good Good Example 2 Good Good Good Example 3 Good Good Good Example 4 Good Good Good Example 5 Good Good Good Example 6 Good Good Good Example 7 Good Good Good Example 8 Good Good Good Comparative Example 1 Good Good Bubble generation Comparative Example 2 Good Good Bubble generation Comparative Example 3 Good Good Bubble generation Comparative Example 4 Bad Good Bubble generation Comparative Example 5 Good Good Bubble generation Comparative Example 6 Bad Good Bubble generation Comparative Example 7 Good Flooding Bubble generation

As can be seen from Table 2 and Table 3, the embodiment according to the present invention shows excellent adhesion performance, chemical resistance, water resistance, and high durability reliability.

On the other hand, when the terpene-type tackifier of 140 degrees or more of a softening point is not added, another tackifier is added, or the softening point is low, it was confirmed that chemical resistance and durability reliability fell remarkably. In addition, in the case of Comparative Example 7 using the urethane-based foam base material it was confirmed that the waterproof performance is not good.

10: description
20: Adhesive layer

Claims (13)

Olefinic foam substrates; And
Including an adhesive layer containing an acrylic resin,
The adhesive layer is a double-sided adhesive tape, characterized in that formed on both sides of the olefinic foam base material.
The method of claim 1,
Double-sided adhesive tape, characterized in that the thickness of the olefinic foam base material is 100 ~ 1,000μm.
The method of claim 1,
Double-sided adhesive tape, characterized in that the compressive strength of the olefinic foam base material is 120 ~ 400kPa at 50% compression.
The method of claim 1,
Double-sided adhesive tape, characterized in that the tensile strength of the olefinic foam base material is 2000 ~ 9000kPa, elongation is 200 ~ 400%.
The method of claim 1,
The acrylic resin further comprises a crosslinkable functional group-containing monomer or a monomer represented by the following formula (1).
[Formula 1]

6. The method of claim 5,
Said crosslinkable functional group containing monomer is 0.1-10 weight part with respect to 100 weight part of acrylic resin, The double-sided adhesive tape characterized by the above-mentioned.
6. The method of claim 5,
The monomer represented by the formula (1) is a double-sided adhesive tape, characterized in that contained 20 parts by weight or less based on 100 parts by weight of the acrylic resin.
The method of claim 1,
Double-sided adhesive tape, characterized in that the thickness of the adhesive layer containing the acrylic resin is 10 ~ 70μm.
The method of claim 1,
The pressure-sensitive adhesive layer containing the acrylic resin further comprises a terpene-based tackifier, characterized in that the double-sided adhesive tape.
The method of claim 9,
The terpene-based tackifier has a softening point of 140 ° C or more.
The method of claim 9,
The adhesive layer is a double-sided adhesive tape, characterized in that containing 5 to 50 parts by weight of the terpene-based tackifier relative to 100 parts by weight of the acrylic resin.
The method of claim 1,
The adhesive layer further comprises 0.01 to 10 parts by weight of a crosslinking agent relative to 100 parts by weight of the acrylic resin.
The method of claim 1,
The crosslinking density after hardening of the said adhesion layer is 40%-97%, The double-sided adhesive tape characterized by the above-mentioned.

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